SN54ALS165, SN74ALS165

PARALLEL-LOAD 8-BIT REGISTERS

SDAS157B – JUNE 1982 – REVISED DECEMBER 1994

Copyright

1

POST OFFICE BOX 655303

Small-Outline (D) Packages, Ceramic Chip

Carriers (FK), and Standard Plastic (N) and

Ceramic (J) 300-mil DIPs

description

The

′ALS165 are parallel-load 8-bit serial shift

registers that, when clocked, shift the data toward

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.

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.

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

SH/LD

CLK

CLK INH

FUNCTION

L

X

X

Parallel load

H

H

X

No change

H

X

H

No change

H

L

↑

Shift†

H

↑

L

Shift†

† Shift = content of each internal register shifts

toward serial outputs. Data at SER is shifted

into first register.

SN54ALS165 ...J PACKAGE

SN74ALS165 ...D OR N PACKAGE

(TOP VIEW)

32

1 20 19

910 11 12 13

4

5

6

7

8

18

17

16

15

14

D

C

NC

B

A

E

F

NC

G

H

SN54ALS165 . . . FK PACKAGE

(TOP VIEW)

NC – No internal connection

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

SH/LD

CLK

E

F

G

H

GND

CLK INH

D

C

B

A

SER

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.