HEF4526BN datasheet(3/10 Pages) PHILIPS

Part #	HEF4526BN

Description	Programmable 4-bit binary down counter

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Manufacturer	PHILIPS [NXP Semiconductors]

Direct Link	http://www.nxp.com

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3 / 10 page

January 1995

3

Philips Semiconductors

Product speciﬁcation

Programmable 4-bit binary down counter

HEF4526B

MSI

Fig.2 Pinning diagram.

HEF4526BP(N):

16-lead DIL; plastic

(SOT38-1)

HEF4526BD(F):

16-lead DIL; ceramic (cerdip)

(SOT74)

HEF4526BT(D):

16-lead SO; plastic

(SOT109-1)

( ): Package Designator North America

PINNING

PL

parallel load input

P0 to P3

parallel inputs

CF

cascade feedback input

CP0

clock input (LOW to HIGH, triggered)

CP1

clock input (HIGH to LOW, triggered)

MR

asynchronous master reset input

TC

terminal count output

O0 to O3

buffered parallel outputs

COUNTING MODE

CF = HIGH; PL = LOW; MR = LOW

COUNT

OUTPUTS

O3

O2

O1

O0

15

H

14

H

L

13

H

L

H

12

H

L

11

H

L

H

10

H

L

H

L

9H

L

H

8H

L

7L

H

6L

H

L

5L

H

L

H

4L

H

L

3L

L

H

2L

L

H

L

1L

L

H

0L

L

FUNCTION TABLE

Notes

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

L = LOW state (the less positive voltage)

X = state is immaterial

= positive-going transition

= negative-going transition

MR

PL

CP0

CP1

MODE

H

X

reset (asynchronous)

L

H

X

preset (asynchronous)

L

H

no change

L

no change

L

X

no change

L

X

no change

L

counter advances

L

H

counter advances

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