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4528B

Dual monostable multivibrator

Philips Electronics 

Philips Semiconductors

Dual monostable multivibrator

Product specification

HEF4528B

MSI

DESCRIPTION

The HEF4528B is a dual retriggerable-resettable

monostable multivibrator. Each multivibrator has an active

LOW input (I0), and active HIGH input (I1), an active LOW

clear direct input (CD), an output (O) and its complement

(O), and two pins for connecting the external timing

components (CTC(1), RCTC).

An external timing capacitor (Ct ) must be connected

between CTC and RCTC and an external resistor (Rt) must

be connected between RCTC and VDD. The duration of the

output pulse is determined by the external timing

components Ct and Rt.

A HIGH to LOW transition on I0 when I1 is LOW or a LOW

to HIGH transition on I1 when I0 is HIGH produces a

positive pulse (LOW-HIGH-LOW) and O and a negative

pulse (HIGH-LOW-HIGH) on O if the CD is HIGH. A LOW

(1) Always connected to ground.

Fig.2 Pinning diagram.

Fig.1 Functional diagram.

on CD forces O LOW, O HIGH and inhibits any further

pulses until CD is HIGH.

HEF4528BP(N): 16-lead DIL; plastic (SOT38-1)

HEF4528BD(F): 16-lead DIL; ceramic (cerdip) (SOT74)

HEF4528BT(D): 16-lead SO; plastic (SOT109-1)

( ): Package Designator North America

PINNING

I0A, I0B

I1A, I1B

CDA, CDB

OA, OB

OA, OB

CTC A, CTC B

RCTC A,

RCTC B

input (HIGH to LOW triggered)

input (LOW to HIGH triggered)

clear direct input (active LOW)

output

complementary output (active LOW)

external capacitor connections (1)

external capacitor/ resistor connections

FAMILY DATA, IDD LIMITS category MSI

See Family Specifications

January 1995

2

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