Philips 74HC123, 74HCT123 DATA SHEET

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

=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

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

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

mna518

R

V

CC

A

B

Q

Fig 4. Logic diagram.

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

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

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

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

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