SN54ALS165, SN74ALS165
PARALLEL-LOAD 8-BIT REGISTERS
SDAS157B – JUNE 1982 – REVISED DECEMBER 1994
SN54ALS165 . . . J PACKAGE
SN74ALS165 . . . D OR N PACKAGE
(TOP VIEW)
• Complementary Outputs
• Direct Overriding Load (Data) Inputs
• Gated Clock Inputs
SH/LD
V
CC
• Parallel-to-Serial Data Conversion
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
CLK
E
CLK INH
D
• Package Options Include Plastic
Small-Outline (D) Packages, Ceramic Chip
Carriers (FK), and Standard Plastic (N) and
Ceramic (J) 300-mil DIPs
F
C
G
B
H
A
Q
SER
description
H
GND
Q
H
The ′ALS165 are parallel-load 8-bit serial shift
registers that, when clocked, shift the data toward
serial (Q and Q ) outputs. Parallel-in access to
SN54ALS165 . . . FK PACKAGE
(TOP VIEW)
H
H
each stage is provided by eight individual direct
data (A–H) inputs that are enabled by a low level
at the shift/load (SH/LD) input. The ′ALS165 have
a clock-inhibit function and complemented serial
outputs.
3
2
1
20 19
18
E
F
D
4
5
6
7
8
Clocking is accomplished by a low-to-high
transition of the clock (CLK) input while SH/LD is
held high and the clock inhibit (CLK INH) input is
held low. The functions of CLK and CLK INH are
interchangeable. Since a low CLK and a
low-to-high transition of CLK INH also
accomplishes clocking, CLK INH should be
changed to the high level only while CLK is high.
Parallel loading is inhibited when SH/LD is held
high. The parallel inputs to the register are
enabled while SH/LD is low independently of the
levels of the CLK, CLK INH, or serial (SER) inputs.
17
16
15
14
C
NC
G
NC
B
H
A
9 10 11 12 13
NC – No internal connection
The SN54ALS165 is characterized for operation over the full military temperature range of –55°C to 125°C. The
SN74ALS165 is characterized for operation from 0°C to 70°C.
FUNCTION TABLE
INPUTS
FUNCTION
CLK CLK INH
SH/LD
L
X
H
X
L
X
X
H
↑
Parallel load
No change
No change
H
H
H
H
†
Shift
Shift
†
↑
L
†
Shift = content of each internal register shifts
toward serial outputs. Data at SER is shifted
into first register.
Copyright 1994, 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.
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
ROCHESTER [ Rochester Electronics ]
