January 1995

4

Philips Semiconductors

Product specification

Dual precision monostable multivibrator

HEF4538B

MSI

FUNCTION TABLE

Notes

1. H = HIGH state (the more positive voltage)

L = LOW state (the less positive voltage)

X = state is immaterial

= positive output pulse

= negative output pulse

= positive-going transition

= negative-going transition

INPUTS

OUTPUTS

O

O

LH

HH

XX

L

L

H

Fig.4

Connection of the external timing

DC CHARACTERISTICS

Note

1. Only one monostable is switching: current present during output pulse (output O is HIGH).

V

SYMBOL

− 40

+ 25

+ 85

TYP.

MAX.

TYP.

MAX.

TYP.

MAX.

Supply current

5

55

µA

active state

10

150

µA

(see note)

15

220

µA

Input leakage

current

15

± I

IN

300

1000 nA

(pins 2 and 14)