The 74ALS164 is an 8-bit edge-triggered shift register with serial
data entry and an output from each of the eight stages. Data is
entered serially through one of two inputs (Dsa, Dsb); either input
can be used as an active-high enable for data entry through the
other input. Both inputs must be connected together or an unused
input must be tied High.
Data shifts one place to the right on each Low-to-high transition of
the clock (CP) input, and enters into Q0 the logical AND of the two
data inputs (Dsa, Dsb) that existed one setup time before the rising
edge. A Low level on the Master reset (MR
inputs and clears the register asynchronously, forcing all outputs
Low.
LXXX L L LLLLLLReset (Clear)
H↑llLq0q1q2q3q4q5q6
H↑lhLq0q1q2q3q4q5q6
H↑hlLq0q1q2q3q4q5q6
H↑hhHq0q1q2q3q4q5q6
NOTES:
H = High voltage level
h = High voltage level one setup time prior to the Low-to-High clock transition
L = Low voltage level
l= Low voltage level one setup time prior to the Low-to-High clock transition
qn = Lower case letter indicate the state of the referenced output one setup time prior to the Low-to-High clock transition.
X = Don’t care
↑ = Low-to-High clock transition
DQ
RD
Q0
3
DQ
RD
Q1
DQ
4
RD
Q2
DQ
5
RD
Q3
DQ
6
RD
Q4
10
DQ
RD
Q5
11
DQ
RD
Q6
12
DQ
CPCPCPCPCPCPCPCP
RD
Q7
13
SF00715
APPLICATION
The 74ALS164 can be cascaded to form synchronous shift registers of longer length.
Here, two devices are combined to form a 16-bit shift register.
(Operation beyond the limit set forth in this table may impair the useful life of the device.
Unless otherwise noted these limits are over the operating free-air temperature range.)
SYMBOL
V
V
I
T
T
CC
V
I
IN
OUT
OUT
amb
stg
Supply voltage–0.5 to +7.0V
Input voltage –0.5 to +7.0V
IN
Input current–30 to +5mA
Voltage applied to output in High output state–0.5 to V
Current applied to output in Low output state16mA
Operating free-air temperature range0 to +70°C
Storage temperature range–65 to +150°C
Philips Semiconductors and Philips Electronics North America Corporation reserve the right to make changes, without notice, in the products,
including circuits, standard cells, and/or software, described or contained herein in order to improve design and/or performance. Philips
Semiconductors assumes no responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright,
or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask
work right infringement, unless otherwise specified. Applications that are described herein for any of these products are for illustrative purposes
only. Philips Semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing
or modification.
LIFE SUPPORT APPLICA TIONS
Philips Semiconductors and Philips Electronics North America Corporation Products are not designed for use in life support appliances, devices,
or systems where malfunction of a Philips Semiconductors and Philips Electronics North America Corporation Product can reasonably be expected
to result in a personal injury. Philips Semiconductors and Philips Electronics North America Corporation customers using or selling Philips
Semiconductors and Philips Electronics North America Corporation Products for use in such applications do so at their own risk and agree to fully
indemnify Philips Semiconductors and Philips Electronics North America Corporation for any damages resulting from such improper use or sale.
Philips Semiconductors
811 East Arques Avenue
P.O. Box 3409
Sunnyvale, California 94088–3409
Telephone 800-234-7381
This data sheet contains the design target or goal specifications for product development. Specifications
may change in any manner without notice.
This data sheet contains preliminary data, and supplementary data will be published at a later date. Philips
Semiconductors reserves the right to make changes at any time without notice in order to improve design
and supply the best possible product.
This data sheet contains Final Specifications. Philips Semiconductors reserves the right to make changes
at any time without notice, in order to improve design and supply the best possible product.
Copyright Philips Electronics North America Corporation 1997
All rights reserved. Printed in U.S.A.
1991 Feb 08
9
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