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 (L1, L2, L4, L8, L16and L32) plus one. Serial
data may be selected from the DAor DBdata inputs with
the A/B select input. This feature is useful for recirculation
purposes. Information on D
A
or DBis 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
CP0while CP1is LOW or on the HIGH to LOW transition
of CP1while CP0is 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, IDDLIMITS 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
This text is here in white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader.This text is here in
_white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader.This text is here inThis text is here in
white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader. white to force landscape pages to be ...
Fig.3 Logic diagram.
Loading...