The SN54165 and SN74165 devices
are obsolete and are no longer supplied.
D
D
D
D
SN54165, SN54LS165A, SN74165, SN74LS165A
PARALLEL-LOAD 8-BIT SHIFT REGISTERS
Complementary Outputs
Direct Overriding Load (Data) Inputs
Gated Clock Inputs
Parallel-to-Serial Data Conversion
TYPICAL MAXIMUM
CLOCK FREQUENCY
26 MHz
35 MHz
SH/LD
CLK
E
F
G
H
QH
GND
210 mW
’LS165A
SN54165, SN54LS165A . . . J OR W PACKAGE
SN74165 . . . N PACKAGE
SN74LS165A . . . D OR N PACKAGE
(TOP VIEW)
TYPICAL
POWER DISSIPATION
’165
SDLS062C – OCTOBER 1976 – REVISED JANUARY 2002
90 mW
TYPE
description
Clocking is accomplished through a 2-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.
15
3
14
4
13
5
VCC
CLK INH
D
C
B
A
SER
QH
16
2
12
6
11
7
10
8
9
CLK
SH/LD
NC
VCC
CLK INH
SN54LS165A . . . FK PACKAGE
(TOP VIEW)
E
F
NC
G
H
4
3 2 1 20 19
18
5
17
6
16
7
15
8
14
9 10 11 12 13
D
C
NC
B
A
QH
GND
NC
QH
SER
The ’165 and ’LS165A are 8-bit serial shift
registers that shift the data in the direction of QA
toward QH 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 eight bit. All
inputs
are
diode-clamped
to minimize
transmission-line effects, thereby simplifying
system design.
1
NC – No internal connection
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.
Copyright 2002, Texas Instruments Incorporated
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.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
1
