Datasheet 74HC123, 74HCT123 Datasheet (Philips)

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

Rev. 03 — 11 May 2004 Product data sheet

1. General description

The 74HC123; 74HCT123 are high-speed Si-gate CMOS devices and are pin compatible
with low power Schottky TTL (LSTTL). They are specified in compliance with JEDEC
standard no. 7A.

The 74HC123; 74HCT123 are dual retriggerable monostable multivibrators with output
pulse width control by three methods:

2. Features

1. The basic pulse time is programmed by selection of an external resistor (R
capacitor (C

2. Once triggered, the basic output pulse width may be extended by retriggering the
gated activeLOW-going edge input (nA) or the active HIGH-going edge input (nB). By
repeating this process, the output pulse period (nQ = HIGH, nQ = LOW) can be made
as long as desired. Alternatively an output delay can be terminated at any time by a
LOW-going edge on input nRD, which also inhibits the triggering.

3. An internal connection from nRD to the input gates makes it possible to trigger the
circuit by a HIGH-going signal at input nRD as shown in the function table.

Schmitt-trigger action in the nA and nB inputs, makes the circuit highly tolerant to slower
input rise and fall times.

The 74HC123; 74HCT123 is identical to the 74HC423; 74HCT423 but can be triggered
via the reset input.

■ DC triggered from active HIGH or active LOW inputs

■ Retriggerable for very long pulses up to 100 % duty factor

■ Direct reset terminates output pulse

■ Schmitt-trigger action on all inputs except for the reset input

■ ESD protection:

◆ HBM EIA/JESD22-A114-B exceeds 2000 V

◆ MM EIA/JESD22-A115-A exceeds 200 V.

■ Specified from −40 °Cto+80°C and from −40 °C to +125 °C.

EXT

).

EXT

) and

Philips Semiconductors

3. Quick reference data

Table 1: Quick reference data

GND = 0 V; T

Symbol Parameter Conditions Min Typ Max Unit

Type 74HC123

, t

t

PHL

C

I

C

PD

Type 74HCT123

, t

t

PHL

C

I

C

PD

amb

propagation delay

PLH

n
propagation delay

n
input capacitance - 3.5 - pF
power dissipation

capacitance per
monostable

propagation delay

PLH

n
propagation delay

n
input capacitance - 3.5 - pF
power dissipation

capacitance per
monostable

=25°C; tr=tf=6ns

A, nB to nQ, nQ

RD to nQ, nQ

A, nB to nQ, nQ

RD to nQ, nQ

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

= 0 pF;R

C

EXT

C

= 15 pF; VCC=5V

L

= 0 pF;R

C

EXT

C

= 15 pF; VCC=5V

L

= 0 pF;R

C

EXT

C

= 15 pF; VCC=5V

L

= 0 pF;R

C

EXT

C

= 15 pF; VCC=5V

L

EXT

EXT

EXT

EXT

=5kΩ;

=5kΩ;

=5kΩ;

=5kΩ;

-26-ns

-20-ns

[1] [2]

-54-pF

-26-ns

-23-ns

[1] [3]

-56-pF

[1] CPD is used to determine the dynamic power dissipation (PD in µW):

PD=CPD× V
fi= input frequency in MHz;
fo= output frequency in MHz;
D = duty factor in %;
CL= output load capacitance in pF;
VCC= supply voltage in V;
C

= timing capacitance in pF;

EXT

∑ (CL× V

[2] For 74HC123 the condition is VI= GND to VCC.
[3] For 74HCT123 the condition is VI= GND to VCC− 1.5 V.

2

× fi+ ∑(CL× V

CC

2

× fo) sum of outputs.

CC

2

× fo) + 0.75 × C

CC

EXT

2

× V

× fo+D× 16 × VCC where:

CC

4. Ordering information

Table 2: Ordering information

Type number Package

Temperature range Name Description Version

74HC123N −40 °C to +125 °C DIP16 plastic dual in-line package; 16 leads (300 mil);
74HCT123N −40 °C to +125 °C
74HC123D −40 °C to +125 °C SO16 plastic small outline package; 16 leads; body width
74HCT123D −40 °C to +125 °C

long body

3.9 mm

SOT38-1

SOT109-1

9397 750 13024 © Koninklijke Philips Electronics N.V. 2004. All rights reserved.

Product data sheet Rev. 03 — 11 May 2004 2 of 26

Philips Semiconductors

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

Table 2: Ordering information

…continued

Type number Package

Temperature range Name Description Version

74HC123DB −40 °C to +125 °C SSOP16 plastic shrink small outline package; 16 leads;
74HCT123DB −40 °C to +125 °C

body width 5.3 mm

74HC123PW −40 °C to +125 °C TSSOP16 plastic thin shrink small outline package; 16 leads;
74HCT123PW −40 °C to +125 °C

body width 4.4 mm

5. Functional diagram

1CEXT

14

11A

2

1B

1RD

3

S

T

R

D

1REXT/CEXT

Q

1Q

1QQ4

2CEXT 6

15

13

SOT338-1

SOT403-1

10 2B

11

Fig 1. Functional diagram.

2REXT/CEXT

S

2A

9

2RD

Q

T

Q

R

D

7

2Q 5

2Q 12

001aaa610

9397 750 13024 © Koninklijke Philips Electronics N.V. 2004. All rights reserved.

Product data sheet Rev. 03 — 11 May 2004 3 of 26

Philips Semiconductors

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

14
15

1CEXT

11A

2A

9

2

1B

10 2B

1RD

3

11

2RD

S

T

R

D

2CEXT 6

1REXT/CEXT
2REXT/CEXT

1Q

Q

2Q 5

1QQ4
2Q 12

14

15

7

13

mna515

1
2

3

6
7

9
10

11

Fig 2. Logic symbol. Fig 3. IEC logic symbol.

V

CC

CX
RCX

&

R

CX
RCX

&

R

13

4

5

12

mna516

REXT/CEXT

RD

CL

R

CL

V

CC

CL

CL CL

R

R

mna518

R

V

CC

A

B

Q

Q

Fig 4. Logic diagram.

9397 750 13024 © Koninklijke Philips Electronics N.V. 2004. All rights reserved.

Product data sheet Rev. 03 — 11 May 2004 4 of 26

Philips Semiconductors

6. Pinning information

6.1 Pinning

Fig 5. Pin configuration.

6.2 Pin description

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

1A V

1

1B 1REXT/CEXT

2

1RD 1CEXT

3

1Q 1Q

4

2Q 2Q

5

2CEXT 2RD

6

2REXT/CEXT 2B

7

GND 2A

8

123

001aaa698

16
15
14
13
12
11
10

9

CC

Table 3: Pin description

Pin Symbol Description

11

A trigger inputs (negative-edge triggered)
2 1B trigger inputs (positive-edge triggered)
31
41

RD direct reset LOW and trigger action at positive edge

Q outputs (active LOW)
5 2Q outputs (active HIGH)
6 2CEXT external capacitor connection
7 2REXT/CEXT external resistor and capacitor connection
8 GND ground (0 V)
92

A trigger inputs (negative-edge triggered)
10 2B trigger inputs (positive-edge triggered)
11 2
12 2

RD direct reset LOW and trigger action at positive edge

Q outputs (active LOW)
13 1Q outputs (active HIGH)
14 1CEXT external capacitor connection
15 1REXT/CEXT external resistor and capacitor connection
16 V

CC

supply voltage

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Product data sheet Rev. 03 — 11 May 2004 5 of 26

Philips Semiconductors

7. Functional description

7.1 Function table

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

Table 4: Function table

[1]

Input Output
nRD nA nB nQ nQ

LXXLH
XHXL
XXLL

[2]
[2]

[2]

H

[2]

H

HL↑
H ↓ H
↑ LH

[1] H = HIGH voltage level

L = LOW voltage level
X = don’t care

↑ = LOW-to-HIGH transition
↓ = HIGH-to-LOW transition

= one HIGH level output pulse
= one LOW level output pulse.

[2] If the monostable was triggered before this condition was established, the pulse will continue as

programmed.

8. Limiting values

Table 5: Limiting values

In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to
GND (ground = 0 V).

Symbol Parameter Conditions Min Max Unit

V

CC

I

IK

I

OK

I

O

I

, I

CC

T

stg

P

tot

[1] Above 70 °C: P
[2] Above 70 °C: P

supply voltage −0.5 +7 V
input diode current VI < −0.5 V or VI>VCC+ 0.5 V - ±20 mA
output diode current VO< −0.5 V or

output source or sink

V

O>VCC

VO = −0.5 V to VCC+ 0.5 V - ±25 mA

+ 0.5 V

- ±20 mA

current, except for pins
nREXT/CEXT

GNDVCC

or GND current - ±50 mA
storage temperature −65 +150 °C
power dissipation

[1]

DIP16 package
SO16, SSOP16 and

- 750 mW

[2]

- 500 mW

TSSOP16 packages

derates linearly with 12 mW/K.

tot

derates linearly with 8 mW/K.

tot

9397 750 13024 © Koninklijke Philips Electronics N.V. 2004. All rights reserved.

Product data sheet Rev. 03 — 11 May 2004 6 of 26

Philips Semiconductors

Dual retriggerable monostable multivibrator with reset

9. Recommended operating conditions

Table 6: Recommended operating conditions

Symbol Parameter Conditions Min Typ Max Unit

Type 74HC123

V

CC

V

I

V

O

, t

t

r

f

T

amb

Type 74HCT123

V

CC

V

I

V

O

, t

t

r

f

T

amb

supply voltage 2.0 5.0 6.0 V
input voltage 0 - V
output voltage 0 - V
input rise and fall

times for n

RD input

operating ambient

= 2.0 V - - 1000 ns

V

CC

= 4.5 V - 6.0 500 ns

V

CC

= 6.0 V - - 400 ns

V

CC

see Section 10 and 11 −40 - +125 °C

temperature

supply voltage 4.5 5.0 5.5 V
input voltage 0 - V
output voltage 0 - V
input rise and fall

times for n

RD input

operating ambient

= 4.5 V - 6.0 500 ns

V

CC

see Section 10 and 11 −40 - +125 °C

temperature

74HC123; 74HCT123

V

CC

V

CC

V

CC

V

CC

10. Static characteristics

Table 7: Static characteristics type 74HC123

At recommended operating conditions; voltages are referenced to GND (ground = 0 V).

Symbol Parameter Conditions Min Typ Max Unit

=25°C

T

amb

V

IH

V

IL

V

OH

HIGH-level input voltage VCC= 2.0 V 1.5 1.2 - V

= 4.5 V 3.15 2.4 - V

V

CC

= 6.0 V 4.2 3.2 - V

V

CC

LOW-level input voltage VCC= 2.0 V - 0.8 0.5 V

= 4.5 V - 2.1 1.35 V

V

CC

= 6.0 V - 2.8 1.8 V

V

CC

HIGH-level output voltage VI=VIHor V

IL

IO= −20 µA; VCC= 2.0 V 1.9 2.0 - V

= −20 µA; VCC= 4.5 V 4.4 4.5 - V

I

O

= −20 µA; VCC= 6.0 V 5.9 6.0 - V

I

O

= −4 mA; VCC= 4.5 V 3.98 4.32 - V

I

O

= −5.2 mA; VCC= 6.0 V 5.48 5.81 - V

I

O

9397 750 13024 © Koninklijke Philips Electronics N.V. 2004. All rights reserved.

Product data sheet Rev. 03 — 11 May 2004 7 of 26

Philips Semiconductors

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

Table 7: Static characteristics type 74HC123

…continued

At recommended operating conditions; voltages are referenced to GND (ground = 0 V).

Symbol Parameter Conditions Min Typ Max Unit

V

OL

LOW-level output voltage VI=VIHor V

IL

IO=20µA; VCC= 2.0 V - 0 0.1 V

=20µA; VCC= 4.5 V - 0 0.1 V

I

O

=20µA; VCC= 6.0 V - 0 0.1 V

I

O

= 4 mA; VCC= 4.5 V - 0.15 0.26 V

I

O

= 5.2 mA; VCC= 6.0 V - 0.16 0.26 V

I

O

I

LI

I

CC

C

I

= −40 °C to +85 °C

T

amb

V

IH

V

IL

V

OH

input leakage current VI=VCCor GND; VCC= 6.0 V - - ±0.1 µA
quiescent supply current VI=VCCor GND; IO=0A;

V

= 6.0 V

CC

- - 8.0 µA

input capacitance - 3.5 - pF

HIGH-level input voltage VCC= 2.0 V 1.5 - - V

= 4.5 V 3.15 - - V

V

CC

= 6.0 V 4.2 - - V

V

CC

LOW-level input voltage VCC= 2.0 V - - 0.5 V

= 4.5 V - - 1.35 V

V

CC

= 6.0 V - - 1.8 V

V

CC

HIGH-level output voltage VI=VIHor V

IL

IO= −20 µA; VCC= 2.0 V 1.9 - - V

= −20 µA; VCC= 4.5 V 4.4 - - V

I

O

= −20 µA; VCC= 6.0 V 5.9 - - V

I

O

= −4 mA; VCC= 4.5 V 3.84 - - V

I

O

= −5.2 mA; VCC= 6.0 V 5.34 - - V

I

O

V

OL

LOW-level output voltage VI=VIHor V

IL

IO=20µA; VCC= 2.0 V - - 0.1 V

=20µA; VCC= 4.5 V - - 0.1 V

I

O

=20µA; VCC= 6.0 V - - 0.1 V

I

O

= 4 mA; VCC= 4.5 V - - 0.33 V

I

O

= 5.2 mA; VCC= 6.0 V - - 0.33 V

I

O

I

LI

I

CC

= −40 °C to +125 °C

T

amb

V

IH

V

IL

input leakage current VI=VCCor GND; VCC= 6.0 V - - ±1.0 µA
quiescent supply current VI=VCCor GND; IO=0A;

V

= 6.0 V

CC

--80µA

HIGH-level input voltage VCC= 2.0 V 1.5 - - V

= 4.5 V 3.15 - - V

V

CC

= 6.0 V 4.2 - - V

V

CC

LOW-level input voltage VCC= 2.0 V - - 0.5 V

= 4.5 V - - 1.35 V

V

CC

= 6.0 V - - 1.8 V

V

CC

9397 750 13024 © Koninklijke Philips Electronics N.V. 2004. All rights reserved.

Product data sheet Rev. 03 — 11 May 2004 8 of 26

Philips Semiconductors

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

Table 7: Static characteristics type 74HC123

…continued

At recommended operating conditions; voltages are referenced to GND (ground = 0 V).

Symbol Parameter Conditions Min Typ Max Unit

V

OH

V

OL

I

LI

I

CC

HIGH-level output voltage VI=VIHor V

= −20 µA; VCC= 2.0 V 1.9 - - V

I

O

= −20 µA; VCC= 4.5 V 4.4 - - V

I

O

= −20 µA; VCC= 6.0 V 5.9 - - V

I

O

= −4 mA; VCC= 4.5 V 3.7 - - V

I

O

= −5.2 mA; VCC= 6.0 V 5.2 - - V

I

O

LOW-level output voltage VI=VIHor V

=20µA; VCC= 2.0 V - - 0.1 V

I

O

=20µA; VCC= 4.5 V - - 0.1 V

I

O

=20µA; VCC= 6.0 V - - 0.1 V

I

O

= 4 mA; VCC= 4.5 V - - 0.4 V

I

O

= 5.2 mA; VCC= 6.0 V - - 0.4 V

I

O

IL

IL

-

-

input leakage current VI=VCCor GND; VCC= 6.0 V - - ±1.0 µA
quiescent supply current VI=VCCor GND; IO=0A;

V

= 6.0 V

CC

- - 160 µA

Table 8: Static characteristics type 74HCT123

At recommended operating conditions; voltages are referenced to GND (ground = 0 V).

Symbol Parameter Conditions Min Typ Max Unit

=25°C

T

amb

V

IH

V

IL

V

OH

V

OL

I

LI

I

CC

∆I

CC

C

I

= −40 °C to +85 °C

T

amb

V

IH

V

IL

HIGH-level input voltage VCC= 4.5 V to 5.5 V 2.0 1.6 - V
LOW-level input voltage VCC= 4.5 V to 5.5 V - 1.2 0.8 V
HIGH-level output voltage VI=VIHor VIL; VCC= 4.5 V

= −20 µA 4.4 4.5 - V

I

O

= −4 mA 3.98 4.32 - V

I

O

LOW-level output voltage VI=VIHor VIL; VCC= 4.5 V

=20µA - 0 0.1 V

I

O

= 4.0 mA - 0.15 0.26 V

I

O

input leakage current VI=VCCor GND; VCC= 5.5 V - - ±0.1 µA
quiescent supply current VI=VCCor GND; IO=0A;

V

= 5.5 V

CC

additional quiescent supply
current per input pin

VI=VCC− 2.1 V; other inputs
V
V

or GND;

I=VCC

= 4.5 V to 5.5 V; IO=0A

CC

A, nB - 35 125 µA

pins n

RD - 50 180 µA

pin n

- - 8.0 µA

input capacitance - 3.5 - pF

HIGH-level input voltage VCC= 4.5 V to 5.5 V 2.0 - - V
LOW-level input voltage VCC= 4.5 V to 5.5 V - - 0.8 V

9397 750 13024 © Koninklijke Philips Electronics N.V. 2004. All rights reserved.

Product data sheet Rev. 03 — 11 May 2004 9 of 26

Philips Semiconductors

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

Table 8: Static characteristics type 74HCT123

…continued

At recommended operating conditions; voltages are referenced to GND (ground = 0 V).

Symbol Parameter Conditions Min Typ Max Unit

V

OH

V

OL

I

LI

I

CC

∆I

CC

= −40 °C to +125 °C

T

amb

V

IH

V

IL

V

OH

V

OL

I

LI

I

CC

∆I

CC

HIGH-level output voltage VI=VIHor VIL; VCC= 4.5 V

= −20 µA 4.4 - - V

I

O

= −4 mA 3.84 - - V

I

O

LOW-level output voltage VI=VIHor VIL; VCC= 4.5 V

=20µA - - 0.1 V

I

O

= 4.0 mA - - 0.33 V

I

O

input leakage current VI=VCCor GND; VCC= 5.5 V - - ±1.0 µA
quiescent supply current VI=VCCor GND; IO=0A;

V

= 5.5 V

CC

additional quiescent supply
current per input pin

VI=VCC− 2.1 V; other inputs
V
V

or GND;

I=VCC

= 4.5 V to 5.5 V; IO=0A

CC

A, nB - - 160 µA

pins n

RD - - 225 µA

pin n

--80µA

HIGH-level input voltage VCC= 4.5 V to 5.5 V 2.0 - - V
LOW-level input voltage VCC= 4.5 V to 5.5 V - - 0.8 V
HIGH-level output voltage VI=VIHor VIL; VCC= 4.5 V

= −20 µA 4.4 - - V

I

O

= −4 mA 3.7 - - V

I

O

LOW-level output voltage VI=VIHor VIL; VCC= 4.5 V

=20µA - - 0.1 V

I

O

= 4.0 mA - - 0.4 V

I

O

input leakage current VI=VCCor GND; VCC= 5.5 V - - ±10.0 µA
quiescent supply current VI=VCCor GND; IO=0A;

V

= 5.5 V

CC

additional quiescent supply
current per input pin

VI=VCC− 2.1 V; other inputs
V
V

or GND;

I=VCC

= 4.5 V to 5.5 V; IO=0A

CC

A, nB - - 170 µA

pins n

RD - - 245 µA

pin n

- - 160 µA

9397 750 13024 © Koninklijke Philips Electronics N.V. 2004. All rights reserved.

Product data sheet Rev. 03 — 11 May 2004 10 of 26

Philips Semiconductors

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

11. Dynamic characteristics

Table 9: Dynamic characteristics type 72HC123

GND = 0 V; tr=tf= 6 ns; CL= 50 pF; unless otherwise specified; see Figure 9.

Symbol Parameter Conditions Min Typ Max Unit

= 25 °C

T

amb

t

PHL

t

THL

t

W

t

rt

R

C

, t

, t

EXT

EXT

propagationdelaynRD,nA,

PLH

nB to nQ or n

propagation delay n
nQ or n

output transition time see Figure 6

TLH

Q

RD to

Q (reset)

= 0 pF; R

C

EXT

= 2.0 V - 83 255 ns

V

CC

= 4.5 V - 30 51 ns

V

CC

= 6.0 V - 24 43 ns

V

CC

= 15 pF; VCC = 5 V - 26 - ns

C

L

= 0 pF; R

C

EXT

= 2.0 V - 66 215 ns

V

CC

= 4.5 V 24 43

V

CC

= 6.0 V - 19 37 ns

V

CC

= 15 pF; VCC = 5 V - 20 - ns

C

L

= 2.0 V - 19 75 ns

V

CC

= 4.5 V - 7 15 ns

V

CC

= 6.0 V - 6 13 ns

V

CC

trigger pulse width nA = LOW; see Figure 7

= 2.0 V 100 8 - ns

V

CC

= 4.5 V 20 3 - ns

V

CC

= 6.0 V 17 2 - ns

V

CC

nB = HIGH; see

= 2.0 V 100 17 - ns

V

CC

= 4.5 V 20 6 - ns

V

CC

= 6.0 V 17 5 - ns

V

CC

reset pulse width n

output pulse width C

RD = LOW; see Figure 8

= 2.0 V 100 14 - ns

V

CC

= 4.5 V 20 5 - ns

V

CC

= 6.0 V 17 4 - ns

V

CC

= 100 nF; R

EXT

V

= 5.0 V; nQ = HIGH; nQ=LOW;

CC

see

Figure 7 and 8

= 0 pF; R

C

EXT

nQ = HIGH; n
and

8

retrigger time nA, nB C

EXT

see

= 0 pF; R

Figure 7

external timing resistor see Figure 10

= 2.0 V 10 - 1000 kΩ

V

CC

= 5.0 V 2 - 1000 kΩ

V

CC

external timing capacitor VCC = 5.0 V; see Figure 10

= 5 kΩ; see Figure 6

EXT

= 5 kΩ; see Figure 6

EXT

Figure 7

= 10 kΩ;

EXT

= 5 kΩ; VCC= 5.0 V;

EXT

Q = LOW; see Figure 7

= 5 kΩ; VCC= 5.0 V;

EXT

- 450 - µs

[1]

-75-ns

[2] [3]

- 110 - ns

[3]

no limits pF

9397 750 13024 © Koninklijke Philips Electronics N.V. 2004. All rights reserved.

Product data sheet Rev. 03 — 11 May 2004 11 of 26

Philips Semiconductors

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

Table 9: Dynamic characteristics type 72HC123

…continued

GND = 0 V; tr=tf= 6 ns; CL= 50 pF; unless otherwise specified; see Figure 9.

Symbol Parameter Conditions Min Typ Max Unit

C

PD

power dissipation

[4] [5]

-54-pF
capacitance per
monostable

T

= −40 °C to +85 °C

amb

, t

t

PHL

, t

t

THL

t

W

= −40 °C to +125 °C

T

amb

, t

t

PHL

, t

t

THL

9397 750 13024 © Koninklijke Philips Electronics N.V. 2004. All rights reserved.

Product data sheet Rev. 03 — 11 May 2004 12 of 26

propagationdelaynRD,nA,

PLH

nB to nQ or n

propagation delay n
nQ or n

output transition time see Figure 6

TLH

Q

RD to

Q (reset)

= 0 pF; R

C

EXT

= 2.0 V - - 320 ns

V

CC

= 4.5 V - - 64 ns

V

CC

= 6.0 V - - 54 ns

V

CC

= 0 pF; R

C

EXT

= 2.0 V - - 270 ns

V

CC

= 4.5 V - 54

V

CC

= 6.0 V - - 46 ns

V

CC

= 2.0 V - - 95 ns

V

CC

= 4.5 V - - 19 ns

V

CC

= 6.0 V - - 16 ns

V

CC

trigger pulse width nA = LOW; see Figure 7

= 2.0 V 125 - - ns

V

CC

= 4.5 V 25 - - ns

V

CC

= 6.0 V 21 - - ns

V

CC

nB = HIGH; see

= 2.0 V 125 - - ns

V

CC

= 4.5 V 25 - - ns

V

CC

= 6.0 V 21 - - ns

V

CC

reset pulse width n

propagationdelaynRD,nA,

PLH

nB to nQ or n

propagation delay n
nQ or n

output transition time see Figure 6

TLH

Q

RD to

Q (reset)

RD = LOW; see Figure 8

= 2.0 V 125 - - ns

V

CC

= 4.5 V 25 - - ns

V

CC

= 6.0 V 21 - - ns

V

CC

= 0 pF; R

C

EXT

= 2.0 V - - 385 ns

V

CC

= 4.5 V - - 77 ns

V

CC

= 6.0 V - - 65 ns

V

CC

= 0 pF; R

C

EXT

= 2.0 V - - 325 ns

V

CC

= 4.5 V - 65

V

CC

= 6.0 V - - 55 ns

V

CC

= 2.0 V - - 110 ns

V

CC

= 4.5 V - - 22 ns

V

CC

= 6.0 V - - 19 ns

V

CC

= 5 kΩ; see Figure 6

EXT

= 5 kΩ; see Figure 6

EXT

Figure 7

= 5 kΩ; see Figure 6

EXT

= 5 kΩ; see Figure 6

EXT

Philips Semiconductors

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

Table 9: Dynamic characteristics type 72HC123

…continued

GND = 0 V; tr=tf= 6 ns; CL= 50 pF; unless otherwise specified; see Figure 9.

Symbol Parameter Conditions Min Typ Max Unit

t

W

[1] For other R

tW=K× R
tW= typical output pulse width in ns;
R
C
K = constant = 0.45 for VCC= 5.0 V and 0.48 for VCC= 2.0 V.
The inherent test jig and pin capacitance at pins 15 and 7 (nREXT/CEXT) is approximately 7 pF.

[2] The time to retrigger the monostable multivibrator depends on the values of R

extended when the time between the active-going edges of the trigger input pulses meets the minimum retrigger time. If C
the next formula (at VCC= 5.0 V) for the set-up time of a retrigger pulse is valid:

trt= 30 + 0.19 × R
trt= retrigger time in ns;
C
R

The inherent test jig and pin capacitance at pins 15 and 7 (nREXT/CEXT) is 7 pF.
[3] When the device is powered-up, initiate the device via a reset pulse, when C
[4] CPD is used to determine the dynamic power dissipation (PD in µW):

PD=CPD× V

fi= input frequency in MHz;

fo= output frequency in MHz;

D = duty factor in %;

CL= output load capacitance in pF;

VCC= supply voltage in V;

C

∑ (CL× V
[5] The condition is VI= GND to VCC.

trigger pulse width nA = LOW; see Figure 7

= 2.0 V 150 - - ns

V

CC

= 4.5 V 30 - - ns

V

CC

= 6.0 V 26 - - ns

V

CC

nB = HIGH; see

= 2.0 V 150 - - ns

V

CC

= 4.5 V 30 - - ns

V

CC

= 6.0 V 26 - - ns

V

CC

reset pulse width n

and C

EXT

× C

EXT

= external resistor in kΩ;

EXT

= external capacitor in pF;

EXT

= external capacitor in pF;

EXT

= external resistor in kΩ.

EXT

2

CC

= timing capacitance in pF;

EXT

2

× fo) sum of outputs.

CC

combinations see Figure 10. If C

EXT

, where:

EXT

× C

EXT

EXT

× fi+ ∑(CL× V

0.9

+13× R

CC

2

RD = LOW; see Figure 8

= 2.0 V 150 - - ns

V

CC

= 4.5 V 30 - - ns

V

CC

= 6.0 V 26 - - ns

V

CC

1.05

, where:

EXT

× fo) + 0.75 × C

EXT

Figure 7

> 10 nF, the next formula is valid:

EXT

EXT

EXT

2

× V

× fo+D× 16 × VCC where:

CC

and C

<50pF.

. The output pulse width will only be

EXT

EXT

>10 pF,

9397 750 13024 © Koninklijke Philips Electronics N.V. 2004. All rights reserved.

Product data sheet Rev. 03 — 11 May 2004 13 of 26

Philips Semiconductors

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

Table 10: Dynamic characteristics type 72HCT123

GND = 0 V; tr=tf= 6 ns; CL= 50 pF; unless otherwise specified; see Figure 9.

Symbol Parameter Conditions Min Typ Max Unit

= 25 °C

T

amb

t

PHL

propagationdelaynRD,nA,
nB to n

propagation delay n
nQ (reset)

t

PLH

propagationdelaynRD,nA,
nB to nQ

propagation delay n
n

t
t

THL
W

, t

output transition time VCC = 4.5 V; see Figure 6 - 7 15 ns

TLH

trigger pulse width nA = LOW; VCC = 4.5 V; see Figure 7 20 3 - ns

reset pulse width n
output pulse width C

t

rt

R

EXT

C

EXT

C

PD

retrigger time nA, nB C

external timing resistor VCC = 5.0 V; see Figure 10 2 - 1000 kΩ
external timing capacitor VCC = 5.0 V; see Figure 10
power dissipation

capacitance per
monostable

T

= −40 °C to +85 °C

amb

t

PHL

propagationdelaynRD,nA,
nB to n

propagation delay n
nQ (reset)

t

PLH

propagationdelaynRD,nA,
nB to nQ

propagation delay n

n
t
t

THL
W

, t

output transition time VCC = 4.5 V - - 19 ns

TLH

trigger pulse width nA = LOW; VCC = 4.5 V; see Figure 7 25--ns

reset pulse width n

Q

RD to

RD to

Q (reset)

Q

RD to

RD to

Q (reset)

= 0 pF; R

C

EXT

= 4.5 V - 30 51 ns

V

CC

= 15 pF; VCC= 5 V - 26 - ns

C

L

C

= 0 pF; R

EXT

= 4.5 V - 27 46 ns

V

CC

= 15 pF; VCC= 5 V - 23 - ns

C

L

C

= 0 pF; R

EXT

= 4.5 V - 28 51 ns

V

CC

= 15 pF; VCC= 5 V - 26 - ns

C

L

= 0 pF; R

C

EXT

= 4.5 V - 23 46 ns

V

CC

= 15 pF; VCC= 5 V - 23 - ns

C

L

nB = HIGH; V

= 5 kΩ; see Figure 6

EXT

= 5 kΩ; see Figure 6

EXT

= 5 kΩ; see Figure 6

EXT

= 5 kΩ; see Figure 6

EXT

= 4.5 V; see Figure 7 20 5 - ns

CC

RD = LOW; VCC = 4.5 V; see Figure 8 20 7 - ns

= 100 nF; R

EXT

V

= 5.0 V; nQ = HIGH; nQ=LOW;

CC

see

Figure 7 and 8

= 0 pF; R

C

EXT

nQ = HIGH; n
and

8

= 0 pF; R

EXT

see

Figure 7

= 0 pF; R

C

EXT

see

Figure 6

C

= 0 pF; R

EXT

see

Figure 6

C

= 0 pF; R

EXT

see

Figure 6

= 0 pF; R

C

EXT

see

Figure 6

nB = HIGH; V

= 10 kΩ;

EXT

= 5 kΩ; VCC= 5.0 V;

EXT

- 450 - µs

[1]

-75-ns

Q = LOW; see Figure 7

= 5 kΩ; VCC= 5.0 V;

EXT

= 5 kΩ; VCC= 4.5 V;

EXT

= 5 kΩ; VCC= 4.5 V;

EXT

= 5 kΩ; VCC= 4.5 V;

EXT

= 5 kΩ; VCC= 4.5 V;

EXT

= 4.5 V; see Figure 7 25--ns

CC

[2] [3]

- 110 - ns

[3]

[4] [5]

-56-pF

no limits pF

--64ns

--58ns

--64ns

--58ns

RD = LOW; VCC = 4.5 V; see Figure 8 25--ns

9397 750 13024 © Koninklijke Philips Electronics N.V. 2004. All rights reserved.

Product data sheet Rev. 03 — 11 May 2004 14 of 26

Philips Semiconductors

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

Table 10: Dynamic characteristics type 72HCT123

…continued

GND = 0 V; tr=tf= 6 ns; CL= 50 pF; unless otherwise specified; see Figure 9.

Symbol Parameter Conditions Min Typ Max Unit

T

= −40 °C to +125 °C

amb

t

PHL

propagationdelaynRD,nA,

nB to n

Q

propagation delay n

RD to

nQ (reset)
t

PLH

propagationdelaynRD,nA,

nB to nQ

RD to

t
t

THL
W

propagation delay n

n

Q (reset)

, t

output transition time VCC = 4.5 V - - 22 ns

TLH

trigger pulse width nA = LOW; VCC = 4.5 V; see Figure 7 30--ns

reset pulse width n

[1] For other R

tW=K× R
tW= typical output pulse width in ns;
R

= external resistor in kΩ;

EXT

C

= external capacitor in pF;

EXT

K = constant = 0.45 for VCC= 5.0 V and 0.48 for VCC= 2.0 V.
The inherent test jig and pin capacitance at pins 15 and 7 (nREXT/CEXT) is approximately 7 pF.

[2] The time to retrigger the monostable multivibrator depends on the values of R

extended when the time between the active-going edges of the trigger input pulses meets the minimum retrigger time. If C
the next formula (at VCC= 5.0 V) for the set-up time of a retrigger pulse is valid:

trt= 30 + 0.19 × R
trt= typical retrigger time in ns;
C

= external capacitor in pF;

EXT

R

= external resistor in kΩ.

EXT

The inherent test jig and pin capacitance at pins 15 and 7 (nREXT/CEXT) is 7 pF.
[3] When the device is powered-up, initiate the device via a reset pulse, when C
[4] CPD is used to determine the dynamic power dissipation (PD in µW):

PD=CPD× V

fi= input frequency in MHz;

fo= output frequency in MHz;

D = duty factor in %;

CL= output load capacitance in pF;

VCC= supply voltage in V;

C

= timing capacitance in pF;

EXT

∑ (CL× V
[5] The condition is VI= GND to VCC− 1.5 V.

and C

CC

EXT

EXT

2

EXT

× C

, where:

EXT

× C

EXT

2

× fi+ ∑(CL× V

CC

× fo) sum of outputs.

combinations see Figure 10. If C

0.9

+13× R

EXT

2

× fo) + 0.75 × C

CC

= 0 pF; R

C

EXT

see

Figure 6

C

= 0 pF; R

EXT

see

Figure 6

C

= 0 pF; R

EXT

see

Figure 6

= 0 pF; R

C

EXT

see

Figure 6

nB = HIGH; V

= 5 kΩ; VCC= 4.5 V;

EXT

= 5 kΩ; VCC= 4.5 V;

EXT

= 5 kΩ; VCC= 4.5 V;

EXT

= 5 kΩ; VCC= 4.5 V;

EXT

= 4.5 V; see Figure 7 30--ns

CC

--77ns

--69ns

--77ns

--69ns

RD = LOW; VCC = 4.5 V; see Figure 8 30--ns

> 10 nF, the next formula is valid:

EXT

EXT

1.05

, where:

EXT

2

× V

× fo+D× 16 × VCC where:

CC

EXT

EXT

and C

<50pF.

. The output pulse width will only be

EXT

EXT

>10 pF,

9397 750 13024 © Koninklijke Philips Electronics N.V. 2004. All rights reserved.

Product data sheet Rev. 03 — 11 May 2004 15 of 26

Philips Semiconductors

12. Waveforms

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

nB input

nA input

nR

input

D

Q output

Q output

50%

t

t

50%

50%

W

PLH

50%

t

W

50%

t

PLH

t

TLH

t

W

t

THL

t

PHL

(reset)

t

W

t

PLH

t

W

t

PHL

t

PHL

t

THL

t

TLH

t

PLH

(reset)

t

PHL

001aaa771

Fig 6. Propagation delays from inputs (nA, nB, nRD) to outputs (nQ, nQ) and output transition times.

nB input

t

W

nA input

nQ output

t

rt

t

W

t

W

t

W

t

W

mna521

nRD = HIGH

Fig 7. Output pulse control using retrigger pulse.

9397 750 13024 © Koninklijke Philips Electronics N.V. 2004. All rights reserved.

Product data sheet Rev. 03 — 11 May 2004 16 of 26

Philips Semiconductors

nB input

nRD input

nQ output

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

t

W

t

W

nA = LOW

Fig 8. Output pulse control using reset input nRD.

V

CC

V

PULSE

GENERATOR

I

D.U.T.

R

T

Definitions for test circuit:
RT = Termination resistance should be equal to output impedance Zo of the pulse generator.
CL = Load capacitance including jig and probe capacitance (See Section 11 for the value).

Fig 9. Load circuitry for switching times.

t

W

mna522

V

O

C

L

mna101

9397 750 13024 © Koninklijke Philips Electronics N.V. 2004. All rights reserved.

Product data sheet Rev. 03 — 11 May 2004 17 of 26

Philips Semiconductors

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

10

001aaa611

(1)
(2)

(3)

(4)

3

C

EXT

4

(pF)

6

10

t

W

(ns)

5

10

4

10

3

10

2

10

10

110

VCC = 5.0 V; T

(1) R

EXT

(2) R

EXT

(3) R

EXT

(4) R

EXT

10 10

amb

= 100 kΩ
= 50 kΩ
= 10 kΩ
= 2 kΩ

2

= 25 °C.

Fig 10. Typical output pulse width as a function of the

external capacitor value.

0.8

'K' factor

0.6

0.4

0.2

0

08624

001aaa612

VCC (V)

CX = 10 nF; RX = 10 kΩ to 100 kΩ

Fig 11. 74HCT123 typical ‘K’ factor as function of VCC.

13. Application information

13.1 Timing component connections

The basic output pulse width is essentially determined by the values of the external timing
components R

(1) For minimum noise generation it is recommended to ground pins 6 (2CEXT) and 14 (1CEXT)

Fig 12. Timing component connections.

EXT

externally to pin 8 (GND).

and C

EXT

A
B

.

1 (9)
2 (10)

123

GND
8

(1)

C

EXT

nCEXT

3 (11)
nRD

R

EXT

nREXT/CEXT

15 (7)14 (6)

13 (5)

4 (12)

001aaa854

V

CC

Q

Q

9397 750 13024 © Koninklijke Philips Electronics N.V. 2004. All rights reserved.

Product data sheet Rev. 03 — 11 May 2004 18 of 26

Philips Semiconductors

13.2 Power-up considerations

When the monostable is powered-up it may produce an output pulse, with a pulse width
defined by the values of R
circuit shown in Figure 13.

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

EXT

and C

. This output pulse can be eliminated using the

EXT

1 (9)

A
B

2 (10)

Fig 13. Power-up output pulse elimination circuit.

13.3 Power-down considerations

A large capacitor C
the energy stored in this capacitor. When a system containing this device is
powered-down or a rapid decrease of VCC to zero occurs, the monostable may sustain
damage, due to the capacitor discharging through the input protection diodes. To avoid
this possibility, use a damping diode (D
diode able to withstand large current surges and connect as shown in Figure 14.

may cause problems when powering-down the monostable due to

EXT

123

C

EXT

nCEXTGND nREXT/CEXT

RESET

) preferably a germanium or Schottky type

EXT

3 (11)

nRD

R

EXT

15 (7)14 (6)8

13 (5)

4 (12)

001aaa613

V

CC

Q

Q

V

CC

D

EXT

C

EXT

GND

nCEXT nREXT/CEXT
14 (6)8

123

1 (9)

A
B

2 (10)

nRD

3 (11)

R

EXT

15 (7)

13 (5)

4 (12)

001aaa614

V

CC

Q

Q

Fig 14. Power-down protection circuit.

9397 750 13024 © Koninklijke Philips Electronics N.V. 2004. All rights reserved.

Product data sheet Rev. 03 — 11 May 2004 19 of 26

Philips Semiconductors

14. Package outline

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

DIP16: plastic dual in-line package; 16 leads (300 mil); long body

D

seating plane

L

Z

16

pin 1 index

e

b

b

1

9

A

1

w M

SOT38-1

M

E

A

2

A

c

(e )

1

M

H

E

1

0 5 10 mm

DIMENSIONS (inch dimensions are derived from the original mm dimensions)

A

A

A

UNIT

inches

Note

1. Plastic or metal protrusions of 0.25 mm (0.01 inch) maximum per side are not included.

mm

OUTLINE
VERSION

SOT38-1

max.

4.7 0.51 3.7

1 2

min.

max.

1.40

1.14

0.055

0.15

0.045

IEC JEDEC JEITA

050G09 MO-001 SC-503-16

b

b

0.53

0.38

0.021

0.015

cEe M

1

0.32

0.23

0.013

0.009

REFERENCES

D

21.8

21.4

0.86

0.84

8

scale

(1) (1)

6.48

6.20

0.26

0.24

0.3

L

e

1

0.15

0.13

3.9

3.4

EUROPEAN

PROJECTION

M

8.25

7.80

0.32

0.31

E

9.5

8.3

0.37

0.33

H

w

max.

0.2542.54 7.62

0.087

0.010.10.020.19

ISSUE DATE

99-12-27
03-02-13

2.2

(1)

Z

Fig 15. Package outline DIP16.

9397 750 13024 © Koninklijke Philips Electronics N.V. 2004. All rights reserved.

Product data sheet Rev. 03 — 11 May 2004 20 of 26

Philips Semiconductors

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

SO16: plastic small outline package; 16 leads; body width 3.9 mm

D

c

y

Z

16

pin 1 index

1

e

9

8

w M

b

p

SOT109-1

E

H

E

A

2

A

1

detail X

A

X

v M

A

Q

(A )

L

p

L

A

3

θ

0 2.5 5 mm

scale

DIMENSIONS (inch dimensions are derived from the original mm dimensions)

mm

OUTLINE

VERSION

SOT109-1

A

A1A2A3b

max.

0.25

1.75

0.10

0.010

0.069

0.004

p

1.45

1.25

0.057

0.049

IEC JEDEC JEITA

076E07 MS-012

0.25

0.01

0.49

0.36

0.019

0.014

0.25

0.19

0.0100

0.0075

UNIT

inches

Note

1. Plastic or metal protrusions of 0.15 mm (0.006 inch) maximum per side are not included.

(1)E(1) (1)

cD

10.0

9.8

0.39

0.38

REFERENCES

eHELLpQZywv θ

4.0

3.8

0.16

0.15

1.27

0.05

6.2

5.8

0.244

0.228

1.05

0.041

1.0

0.4

0.039

0.016

0.7

0.25

0.6

0.028

0.01 0.004

0.020

EUROPEAN

PROJECTION

0.25 0.1

0.01

0.7

0.3

0.028

0.012

ISSUE DATE

99-12-27
03-02-19

o

8

o

0

Fig 16. Package outline SO16.

9397 750 13024 © Koninklijke Philips Electronics N.V. 2004. All rights reserved.

Product data sheet Rev. 03 — 11 May 2004 21 of 26

Philips Semiconductors

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

SSOP16: plastic shrink small outline package; 16 leads; body width 5.3 mm

D

c

y

Z

16

pin 1 index

9

A

2

A

E

H

E

1

SOT338-1

A

X

v M

A

Q

A

(A )

3

θ

L

p

L

1

e

DIMENSIONS (mm are the original dimensions)

mm

OUTLINE

VERSION

SOT338-1

A

max.

2

0.21

0.05

p

1.80

1.65

IEC JEDEC JEITA

0.25

0.38

0.25

UNIT A1A2A3b

Note

1. Plastic or metal protrusions of 0.25 mm maximum per side are not included.

8

b

p

cD

0.20

6.4

0.09

6.0

REFERENCES

MO-150

w M

0 2.5 5 mm

scale

(1)E(1)

eHELLpQZywv θ

5.4

5.2

7.9

0.65 1.25

7.6

1.03

0.63

detail X

0.9

0.7

0.130.2 0.1

EUROPEAN

PROJECTION

(1)

1.00

0.55

ISSUE DATE

99-12-27
03-02-19

o

8

o

0

Fig 17. Package outline SSOP16.

9397 750 13024 © Koninklijke Philips Electronics N.V. 2004. All rights reserved.

Product data sheet Rev. 03 — 11 May 2004 22 of 26

Philips Semiconductors

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

TSSOP16: plastic thin shrink small outline package; 16 leads; body width 4.4 mm

D

c

y

Z

16

pin 1 index

9

A

2

18

w M

b

e

p

A

1

E

H

E

L

detail X

SOT403-1

A

X

v M

A

Q

(A )

3

A

θ

L

p

0 2.5 5 mm

scale

DIMENSIONS (mm are the original dimensions)

UNIT A1A2A3b

Notes

1. Plastic or metal protrusions of 0.15 mm maximum per side are not included.

2. Plastic interlead protrusions of 0.25 mm maximum per side are not included.

A

max.

0.15

mm

1.1

OUTLINE

VERSION

SOT403-1 MO-153

0.05

0.95

0.25

0.80

IEC JEDEC JEITA

p

0.30

0.19

(1)E(2) (1)

cD

0.2

5.1

0.1

4.9

REFERENCES

eHELLpQZywv θ

4.5

4.3

0.65

6.6

6.2

0.75

0.50

0.4

0.3

EUROPEAN

PROJECTION

0.13 0.10.21

0.40

0.06

ISSUE DATE

99-12-27
03-02-18

o

8

o

0

Fig 18. Package outline TSSOP16.

9397 750 13024 © Koninklijke Philips Electronics N.V. 2004. All rights reserved.

Product data sheet Rev. 03 — 11 May 2004 23 of 26

Philips Semiconductors

Dual retriggerable monostable multivibrator with reset

74HC123; 74HCT123

15. Revision history

Table 11: Revision history

Document ID Release date Data sheet status Change notice Order number Supersedes

74HC_HCT123_3 20040511 Product data - 9397 750 13024 74HC_HCT123_2
Modifications:

74HCHCT123_2 19980708 Product specification - - 74HC_HCT123_1

• The format of this data sheet has been redesigned to comply with the current presentation and

information standard of Philips Semiconductors.

• Section 2 on page 1: ESD clause added

• Section 8 on page 6, Section 9 on page 7, and Section 10 on page 7: These sections replace

references to family specifications

• Table note 1 on page 13: Changed ‘K’ factor from 0.55 to 0.45

• Table note 1 on page 15: Changed ‘K’ factor from 0.55 to 0.45

9397 750 13024 © Koninklijke Philips Electronics N.V. 2004. All rights reserved.

Product data sheet Rev. 03 — 11 May 2004 24 of 26

Philips Semiconductors

16. Data sheet status

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

Level Data sheet status

I Objective data Development This data sheet contains data from the objective specification for product development. Philips

II Preliminary data Qualification This datasheetcontains data fromthe preliminary specification. Supplementary datawill be published

III Product data Production This data sheet contains data from the product specification. Philips Semiconductors reserves the

[1] Please consult the most recently issued data sheet before initiating or completing a design.
[2] The product status of the device(s) described in this data sheet may have changed since this data sheet was published. The latest information is available on the Internet at

URL http://www.semiconductors.philips.com.

[3] For data sheets describing multiple type numbers, the highest-level product status determines the data sheet status.

[1]

Product status

17. Definitions

Short-form specification — The data in a short-form specification is

extracted from a full data sheet with the same type number and title. For
detailed information see the relevant data sheet or data handbook.

Limiting values definition — Limiting values given are in accordance with
the Absolute Maximum Rating System (IEC 60134). Stress above one or
more of the limiting values may cause permanent damage to the device.
These are stress ratings only and operation of the device at these or at any
other conditions above those given in the Characteristics sections of the
specification is not implied. Exposure to limiting values for extended periods
may affect device reliability.

Application information — Applications that are described herein for any
of these products are for illustrative purposes only. Philips Semiconductors
make no representation or warrantythat such applications will be suitable for
the specified use without further testing or modification.

[2] [3]

Definition

Semiconductors reserves the right to change the specification in any manner without notice.

at a laterdate. Philips Semiconductors reserves the right tochange the specification without notice,in
order to improve the design and supply the best possible product.

right to make changesat any time in order to improvethe design, manufacturing and supply. Relevant
changes will be communicated via a Customer Product/Process Change Notification (CPCN).

18. Disclaimers

Life support — These products are not designed for use in life support

appliances, devices, or systems where malfunction of these products can
reasonably be expected to result in personal injury. Philips Semiconductors
customers using or selling these products for use in such applications do so
at their own risk and agree to fully indemnify Philips Semiconductors for any
damages resulting from such application.

Right to make changes — Philips Semiconductors reserves the right to
make changes in the products - including circuits, standard cells, and/or
software - described or contained herein in order to improve design and/or
performance. When the product is in full production (status ‘Production’),
relevant changes will be communicated via a Customer Product/Process
Change Notification (CPCN). Philips Semiconductors assumes no
responsibility or liability for the use of any of these products, conveys no
license or title under any patent, copyright, or mask work right to these
products, andmakes norepresentations or warrantiesthat these productsare
free frompatent, copyright, or maskwork right infringement, unlessotherwise
specified.

19. Contact information

For additional information, please visit: http://www.semiconductors.philips.com
For sales office addresses, send an email to: [e-mail]

9397 750 13024 © Koninklijke Philips Electronics N.V. 2004. All rights reserved.

Product data sheet Rev. 03 — 11 May 2004 25 of 26

Philips Semiconductors

20. Contents

1 General description. . . . . . . . . . . . . . . . . . . . . . 1

2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

3 Quick reference data . . . . . . . . . . . . . . . . . . . . . 2

4 Ordering information. . . . . . . . . . . . . . . . . . . . . 2

5 Functional diagram . . . . . . . . . . . . . . . . . . . . . . 3

6 Pinning information. . . . . . . . . . . . . . . . . . . . . . 5

6.1 Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

6.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 5

7 Functional description . . . . . . . . . . . . . . . . . . . 6

7.1 Function table . . . . . . . . . . . . . . . . . . . . . . . . . . 6

8 Limiting values. . . . . . . . . . . . . . . . . . . . . . . . . . 6

9 Recommended operating conditions. . . . . . . . 7

10 Static characteristics. . . . . . . . . . . . . . . . . . . . . 7

11 Dynamic characteristics . . . . . . . . . . . . . . . . . 11

12 Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

13 Application information. . . . . . . . . . . . . . . . . . 18

13.1 Timing component connections . . . . . . . . . . . 18

13.2 Power-up considerations . . . . . . . . . . . . . . . . 19

13.3 Power-down considerations . . . . . . . . . . . . . . 19

14 Package outline . . . . . . . . . . . . . . . . . . . . . . . . 20

15 Revision history. . . . . . . . . . . . . . . . . . . . . . . . 24

16 Data sheet status . . . . . . . . . . . . . . . . . . . . . . . 25

17 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

18 Disclaimers. . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

19 Contact information . . . . . . . . . . . . . . . . . . . . 25

74HC123; 74HCT123

Dual retriggerable monostable multivibrator with reset

© Koninklijke Philips Electronics N.V. 2004

All rights are reserved. Reproduction in whole or in part is prohibited without the prior
written consent of the copyright owner. The information presented in this document does
not form partof any quotation or contract,is believed to be accurateand reliable and may
be changed without notice. No liability will be accepted by the publisher for any
consequence of its use. Publication thereof does not convey nor imply any license under
patent- or other industrial or intellectual property rights.

Document order number: 9397 750 13024

Published in The Netherlands

Date of release: 11 May 2004