Philips HEF4528BU, HEF4528BT, HEF4528BPB, HEF4528BP, HEF4528BDB Datasheet

INTEGRATED CIRCUITS

DATA SHEET

For a complete data sheet, please also download:

∙The IC04 LOCMOS HE4000B Logic Family Specifications HEF, HEC

∙The IC04 LOCMOS HE4000B Logic Package Outlines/Information HEF, HEC

HEF4528B MSI

Dual monostable multivibrator

Product specification			January 1995
File under Integrated Circuits, IC04

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.

Fig.1 Functional diagram.

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

pulses until CD is HIGH.

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

Fig.2 Pinning diagram.

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

Philips Semiconductors	Product specification

Dual monostable multivibrator

HEF4528B

MSI

Fig.3 Logic diagram (one monostable multivibrator).

January 1995

3