Philips 74LV123PW, 74LV123N, 74LV123DB Datasheet

INTEGRATED CIRCUITS

74LV123

Dual retriggerable monostable
multivibrator with reset

Product specification
Supersedes data of 1997 Feb 04
IC24 Data Handbook

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

1998 Apr 20

Philips Semiconductors Product specification

Dual retriggerable monostable multivibrator
with reset

FEA TURES

•Optimized for Low Voltage applications: 1.0 to 5.5V

•Accepts TTL input levels between V

•Typical V

T

amb

•Typical V

T

amb

(output ground bounce)  0.8V @ VCC = 3.3V,

OLP

= 25°C

(output VOH undershoot)  2V @ VCC = 3.3V,

OHV

= 25°C

= 2.7V and VCC = 3.6V

CC

•DC triggered from active HIGH or active LOW inputs

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

•Direct reset terminates output pulses

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

•Output capability: standard (except for nR

•I

category: MSI

CC

EXT/CEXT

QUICK REFERENCE DATA

GND = 0V; T

SYMBOL

t

PHL/tPLH

C

I

C

PD

NOTES:

1. C

is used to determine the dynamic power dissipation (PD in µW)

PD

= CPD  V

P

D

f

= input frequency in MHz; CL = output load capacitance in pF;

i

= output frequency in MHz; VCC = supply voltage in V;

f

o

 (C

= 25°C; tr = tf 2.5 ns

amb

CC

2

 V

L

 fo) = sum of the outputs.

CC

PARAMETER CONDITIONS TYPICAL UNIT

Propagation delay
nA, nB to nQ, nQ
nRD to nQ, nQ

Input capacitance 3.5 pF
Power dissipation capacitance per monost-

able

2

 fi  (CL  V

2

 fo) where:

CC

)

DESCRIPTION

The 74LV123 is a low-voltage Si-gate CMOS device and is pin and
function compatible with the 74HC/HCT123.

The 74LV123 is a dual retriggerable monostable multivibrator with
output pulse width control by three methods. The basic pulse time is
programmed by selection of an external resistor (R
capacitor (C
Figure 1. Once triggered, the basic output pulse width may be
extended by retriggering the gated active LOW-going edge input
(nA
process, the output pulse period (nQ = HIGH, nQ
made as long as desired. Alternatively, an output delay can be
terminated at any time by a LOW-going edge on input nR
also inhibits the triggering. Figures 1 and 2 illustrate pulse control by
retriggering and early reset. The basic output pulse width is
essentially determined by the values of the external timing
components R
see Figure 5. When C
width is defined as: t
t

= pulse width in ns; R

W

C

EXT

nB inputs makes the circuit highly tolerant of slower input rise and
fall times.

CL = 15pF
V

= 3.3V

CC

= 5KΩ

R

EXT

C

= 0pF

EXT

VCC = 3.3V, VI = GND to V

74L V123

) and

). They are normally connected as shown in

EXT

) or the active HIGH-going edge input (nB). By repeating this

and C

EXT

= external capacitor in pF. Schmitt-trigger action in the nA and

CC

. For pulse width when C

EXT

 10,000pF, the typical output pulse

EXT

= 0.45  R

W

= external resistor in KΩ; and

EXT

1

 C

EXT

25
20

60 pF

EXT

= LOW) can be

EXT

(typ.), where

EXT

, which

D

<10000pF,

ns
ns

ORDERING INFORMATION

PACKAGES TEMPERATURE RANGE OUTSIDE NORTH AMERICA NORTH AMERICA PKG. DWG. #

16-Pin Plastic DIL –40°C to +125°C 74LV123 N 74LV123 N SOT38-1
16-Pin Plastic SO –40°C to +125°C 74LV123 D 74LV123 D SOT109-1
16-Pin Plastic SSOP Type II –40°C to +125°C 74LV123 DB 74LV123 DB SOT338-1
16-Pin Plastic TSSOP Type I –40°C to +125°C 74L V123 PW 74LV123PW DH SOT403-1

1998 Apr 28 853–191 1 19290

2

Philips Semiconductors Product specification

Dual retriggerable monostable multivibrator
with reset

PIN CONFIGURATION

SV00096

16

V

CC

15

1R

EXT/CEXT

14

1C

EXT

13

1Q

12

2Q

11

2R

D

10

2B

9

2A

13

4

5

12

1

1A
1B

2

1R

3

D

1Q

4
5

2Q

2C

6

EXT

GND

7
8

2R

EXT/CEXT

PIN DESCRIPTION

PIN

NUMBER

1,9 1A, 2A

2,10 1B, 2B

3,11 1RD, 2R

4, 12 1Q, 2Q Outputs (active LOW)

7 2R
8 GND Ground (0V)

13, 5 1Q, 2Q Outputs (active HIGH)
14, 6

15 1R
16 V

SYMBOL FUNCTION

Trigger inputs
(negative-edge triggered)

Trigger inputs
(positive-edge triggered)

Direct reset LOW and trigger action at

D

positive edge

EXT/CEXT

1C

EXT,

2C

EXT

EXT/CEXT

CC

External resistor/capacitor connection

External capacitor connection
External resistor/capacitor connection

Positive supply voltage

LOGIC SYMBOL (IEEE/IEC)

14
15

1
2

3

6
7

9
10

CX
RCX

&

R

CX
RCX

&

LOGIC SYMBOL

1A

1
9

2A

1B

2

2B

10

1R

3

D

11

2R

D

FUNCTIONAL DIAGRAM

1A

1

2A

9

1B

2

2B

10

1R

3

D

11

2R

D

74LV123

14

1C

EXT

2C

6

EXT

1R

EXT/CEXT

2R

EXT/CEXT

S

Q

T

Q

R

D

1R

EXT/CEXT

2R

EXT/CEXT

S

Q

T

Q

R

D

1Q
2Q

1Q
2Q

SV00097

1C

EXT

2C

EXT

1Q
2Q

1Q
2Q

SV00099

15

7

13

5

4

12

14

6

15

7

13

5

4

12

1998 Apr 28

11

R

SV00098

3

Philips Semiconductors Product specification

Dual retriggerable monostable multivibrator
with reset

LOGIC DIAGRAM

R

D

RR

CLCLV

CC

V

CC

CL

R

nR

V

CC

74LV123

EXT/CEXT

Q

Q

A

B

R

It is recommended that Pin 6 (2C

) and Pin 14 (1C

EXT

CLCL

FUNCTION TABLE

INPUTS OUTPUTS

nR

D

L X X L H
X H X L * H *
X X L L * H *
H L ↑
H ↓ H
↑ L H

NOTES:

* If the monostable was triggered before this condition was

established, the pulse will continue as programmed.
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

nA nB nQ nQ

) by externally grounded to Pin 8 (GND)

EXT

to nC

(pin 14 or 6)

Figure 1.Timing component connection

EXT

SV00100

V

CC

R

EXT

C

EXT

to nR

EXT/CEXT

(pin 15 or 7)

SV00101

1998 Apr 28

4

Philips Semiconductors Product specification

Dual retriggerable monostable multivibrator

74LV123

with reset

RECOMMENDED OPERATING CONDITIONS

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNIT

1

1.0 3.3 5.5 V

CC
CC

–40
–40

–
–
–
–

–
–
–
–

+85

+125

500
200
100

50

25

T

V

V

tr, t

CC

V

amb

DC supply voltage See Note
Input voltage 0 – V

I

Output voltage 0 – V

O

Operating ambient temperature range in free
air

Input rise and fall times except for

f

Schmitt-trigger inputs

NOTE:

1. The LV is guaranteed to function down to V

ABSOLUTE MAXIMUM RATINGS

= 1.0V (input levels GND or VCC); DC characteristics are guaranteed from VCC = 1.2V to VCC = 5.5V.

CC

1, 2

In accordance with the Absolute Maximum Rating System (IEC 134).
Voltages are referenced to GND (ground = 0V).

SYMBOL

V

CC

I

IK

I

OK

I

O

DC supply voltage –0.5 to +7.0 V
DC input diode current VI < –0.5 or VI > VCC + 0.5V 20 mA
DC output diode current VO < –0.5 or VO > VCC + 0.5V 50 mA
DC output source or sink current

– standard outputs

PARAMETER CONDITIONS RATING UNIT

–0.5V < VO < VCC + 0.5V

See DC and AC

characteristics

VCC = 1.0V to 2.0V
VCC = 2.0V to 2.7V
VCC = 2.7V to 3.6V
VCC = 3.6V to 5.5V

V
V

°C

ns/V

mA

I

I

P

GND

T

TOT

stg

DC VCC or GND current for types with

,

– standard outputs 50

CC

Storage temperature range –65 to +150 °C
Power dissipation per package

– plastic DIL
– plastic mini-pack (SO)
– plastic shrink mini-pack (SSOP and TSSOP)

for temperature range: –40 to +125°C
above +70°C derate linearly with 12 mW/K
above +70°C derate linearly with 8 mW/K
above +60°C derate linearly with 5.5 mW/K

750
500
500

mA

mW

NOTES:

1. Stresses beyond those listed may cause permanent damage to the device. These are stress ratings only and functional operation of the

device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to

absolute-maximum-rated conditions for extended periods may affect device reliability .

2. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.

1998 Apr 28

5