Datasheet

SN54165, SN54LS165A, SN74165, SN74LS165A
PARALLEL-LOAD 8-BIT SHIFT REGISTERS
SDLS062D – OCTOBER 1976 – REVISED FEBRUARY 2002
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Complementary Outputs
Direct Overriding Load (Data) Inputs
Gated Clock Inputs
Parallel-to-Serial Data Conversion
TYPE
TYPICAL MAXIMUM
CLOCK FREQUENCY
TYPICAL
POWER DISSIPATION
’165 26 MHz 210 mW
’LS165A 35 MHz 90 mW
description
The ’165 and ’LS165A are 8-bit serial shift
registers that shift the data in the direction of Q
A
toward Q
H
when clocked. Parallel-in access to
each stage is made available by eight individual,
direct data inputs that are enabled by a low level
at the shift/load (SH/LD
) input. These registers
also feature gated clock (CLK) inputs and
complementary outputs from the eighth bit. All
inputs are diode-clamped to minimize
transmission-line effects, thereby simplifying
system design.
Clocking is accomplished through a two-input
positive-NOR gate, permitting one input to be
used as a clock-inhibit function. Holding either of
the clock inputs high inhibits clocking, and holding
either clock input low with SH/LD
high enables the
other clock input. Clock inhibit (CLK INH) should
be changed to the high level only while CLK is
high. Parallel loading is inhibited as long as SH/LD
is high. Data at the parallel inputs are loaded
directly into the register while SH/LD
is low,
independently of the levels of CLK, CLK INH, or
serial (SER) inputs.
The SN54165 and SN74165 devices
are obsolete and are no longer supplied
.
Copyright  2002, Texas Instruments Incorporated
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
SN54165, SN54LS165A ...J OR W PACKAGE
SN74165 ...N PACKAGE
SN74LS165A . . . D, N, OR NS PACKAGE
(TOP VIEW)
3212019
910111213
4
5
6
7
8
18
17
16
15
14
D
C
NC
B
A
E
F
NC
G
H
SN54LS165A . . . FK PACKAGE
(TOP VIEW)
CLK SH/LD NC
SER
CLK INH
H
GND
NC
V
CC
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
SH/LD
CLK
E
F
G
H
Q
H
GND
V
CC
CLK INH
D
C
B
A
SER
Q
H
Q
H
Q
NC – No internal connection
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
On products compliant to MIL-PRF-38535, all parameters are tested
unless otherwise noted. On all other products, production
processing does not necessarily include testing of all parameters.