HEF4528BF datasheet(2/8 Pages) PHILIPS

2 / 8 page

January 1995

Philips Semiconductors

Product speciﬁcation

Dual monostable multivibrator

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

(1) Always connected to ground.

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

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

pulses until CD is HIGH.

Fig.1 Functional diagram.

PINNING

FAMILY DATA, IDD LIMITS category MSI

See Family Specifications

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

I0A, I0B

input (HIGH to LOW triggered)

I1A, I1B

input (LOW to HIGH triggered)

CDA, CDB

clear direct input (active LOW)

OA, OB

output

OA, OB

complementary output (active LOW)

CTC A, CTC B

external capacitor connections (1)

RCTC A,

external capacitor/ resistor connections

RCTC B

Fig.2 Pinning diagram.

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