Philips HEF4557BU, HEF4557BT, HEF4557BP, HEF4557BDB, HEF4557BD Datasheet

DATA SH EET

Product specification

File under Integrated Circuits, IC04

January 1995

INTEGRATED CIRCUITS

HEF4557B

LSI

1-to-64 bit variable length shift

register

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

January 1995 2

Philips Semiconductors Product specification

1-to-64 bit variable length shift register

HEF4557B

LSI

DESCRIPTION

The HEF4557B is a static clocked serial shift register

whose length may be programmed to be any number of

bits between 1 and 64. The number of bits selected is

equal to the sum of the subscripts of the enabled length

control inputs (L

1

, L

2

, L

4

, L

8

, L

16

and L

32

) plus one. Serial

data may be selected from the D

A

or D

B

data inputs with

the A/B select input. This feature is useful for recirculation

purposes. Information on D

A

or D

B

is shifted into the first

register position and all the data in the register is shifted

one position to the right on the LOW to HIGH transition of

CP

0

while CP

1

is LOW or on the HIGH to LOW transition

of CP

1

while CP

0

is HIGH. A HIGH on master reset (MR)

resets the register and forces O to LOW and O to HIGH,

independent of the other inputs.

Fig.1 Functional diagram.

PINNING

D

A

, D

B

data inputs

A/

B select data input

CP

0

clock input

CP

1

clock enable input

MR asynchronous master reset

L

1

to L

32

bit-length control inputs

O,

O buffered outputs

Fig.2 Pinning diagram.

FAMILY DATA, I

DD

LIMITS category LSI

See Family Specifications

HEF4557BP(N): 16-lead DIL; plastic

(SOT38-1)

HEF4557BD(F): 16-lead DIL; ceramic (cerdip)

(SOT74)

HEF4557BT(D): 16-lead SO; plastic

(SOT109-1)

( ): Package Designator North America

January 1995 3

Philips Semiconductors Product specification

1-to-64 bit variable length shift register

HEF4557B

LSI

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Fig.3 Logic diagram.