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74HC423N

Dual retriggerable monostable multivibrator with reset

Philips Electronics 

Philips Semiconductors

Dual retriggerable monostable

multivibrator with reset

Product specification

74HC/HCT423

DC CHARACTERISTICS FOR 74HCT

For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.

Output capability: standard (except for nREXT/CEXT)

ICC category: MSI

Note to HCT types

The value of additional quiescent supply current (∆ICC) for a unit load of 1 is given in the family specifications.

To determine ∆ICC per input, multiply this value by the unit load coefficient shown in the table below.

INPUT

nA, nB

nRD

UNIT LOAD COEFFICIENT

0.35

0.50

AC CHARACTERISTICS FOR 74HCT

GND = 0 V; tr = tf = 6 ns; CL = 50 pF

Tamb (°C)

TEST CONDITIONS

SYMBOL PARAMETER

74HCT

+25

−40 to +85

−40 to +125

UNIT

VCC

(V)

min. typ. max. min. max. min. max.

WAVEFORMS/

NOTES

tPHL/ tPLH propagation delay

nA, nB to nQ, nQ

30 51

64

77 ns

4.5 CEXT = 0 pF;

REXT = 5 kΩ

tPHL/ tPLH propagation delay

nRD to nQ, nQ

26 48

60

72 ns

4.5 CEXT = 0 pF;

REXT = 5 kΩ

tTHL/ tTLH output transition time

7 15

19

22 ns

4.5

tW

trigger pulse width

20 5

nA = LOW

25

30

ns

4.5 Fig.7

tW

trigger pulse width

20 5

nB = HIGH

25

30

ns

4.5 Fig.7

tW

reset pulse width

20 7

25

30

ns

4.5 Fig.8

nRD = LOW

tW

output pulse width

nQ = HIGH

nQ = LOW

450

−

−

µs

5.0 CEXT = 100 nF;

REXT = 10 kΩ;

Figs 7 and 8

tW

output pulse width

nQ = HIGH

nQ = LOW

75

−

−

ns

5.0 CEXT = 0 pF;

REXT = 5 kΩ;

note 1; Figs 7 and

8

trt

retrigger time

nA, nB

110

−

−

ns

5.0 CEXT = 0 pF;

REXT = 5 kΩ;

note 2; Fig.7

REXT

external timing resistor 2

1000 −

−

kΩ

5.0 Fig.9

CEXT

external timing

capacitor

no limits

pF

5.0 Fig.9; note 3

1998 Jul 08

7

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