Philips hef4520b DATASHEETS

INTEGRATED CIRCUITS

DATA SH EET

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

HEF4520B
MSI

Dual binary counter

Product specification
File under Integrated Circuits, IC04

January 1995

Philips Semiconductors Product specification

Dual binary counter

DESCRIPTION

The HEF4520B is a dual 4-bit internally synchronous
binary counter. The counter has an active HIGH clock
input (CP0) and an active LOW clock input (CP1), buffered
outputs from all four bit positions (O0to O3) and an active
HIGH overriding asynchronous master reset input (MR).
The counter advances on either the LOW to HIGH
transition of the CP0input if CP1is HIGH or the HIGH to

HEF4520B

MSI

LOW transition of the
CP1may be used as the clock input to the counter and the
other clock input may be used as a clock enable input. A
HIGH on MR resets the counter (O0to O3= LOW)
independent of CP0, CP1.
Schmitt-trigger action in the clock input makes the circuit
highly tolerant to slower clock rise and fall times.

CP1input if CP0 is low. Either CP0or

Fig.2 Pinning diagram.

Fig.1 Functional diagram.

PINNING

,CP

CP

0A

0B

CP1A, CP
MR
O

0A

O

0B

,MR

A

to O
to O

1B

B
3A
3B

FAMILY DATA, I

clock inputs (L to H triggered)
clock inputs (H to L triggered)
master reset inputs
outputs
outputs

LIMITS category MSI

DD

See Family Specifications

HEF4520BP(N): 16-lead DIL; plastic

(SOT38-1)

HEF4520BD(F): 16-lead DIL; ceramic (cerdip)

(SOT74)

HEF4520BT(D): 16-lead SO; plastic (SOT109-1)

(SOT109-1)

( ): Package Designator North America

January 1995 2

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January 1995 3

Fig.3 Logic diagram (one counter).

FUNCTION TABLE

Philips Semiconductors Product specification

Dual binary counter

CP

L L counter advances

X L no change

H L no change
XXHO

Notes

1. H = HIGH state (the more positive voltage)
L = LOW state (the less positive voltage)
X = state is immaterial

CP

0

H L counter advances

X L no change

L L no change

= positive-going transition
= negative-going transition

MR MODE

1

to O3= LOW

0

HEF4520B

MSI