1

Standard Products

UT54ACS165/UT54ACTS165

8-Bit Parallel Shift Registers

Datasheet

November 2010

www.aeroflex.com/logic

FEATURES

Complementary outputs

Direct overriding load (data) inputs

Gated clock inputs

Parallel-to-serial data conversions

1.2μ CMOS

- Latchup immune

High speed

Low power consumption

Single 5 volt supply

Available QML Q or V processes

Flexible package

- 16-pin DIP

- 16-lead flatpack

UT54ACS165 - SMD 5962-96558

UT54ACTS165 - SMD 5962-96559

DESCRIPTION

The UT54ACS165 and the UT54ACTS165 are 8-bit serial shift regis-

in access to each stage is provided by eight individual data inputs that

are enabled by a low level at the SH/LD input. The devices feature a

Clocking is accomplished by a low-to-high transition of the CLK input

while SH/LD is held high and CLK INH is held low. The functions of

the CLK and CLK INH (clock inhibit) inputs are interchangeable. Since

a low CLK input and a low-to-high transition of CLK INH will also

accomplish clocking, CLK INH should be changed to the high level

only while the CLK input is high. Parallel loading is disabled when

SH/LD is held high. Parallel inputs to the registers are enabled while

SH/LD is low independently of the levels of CLK, CLK INH or SER

inputs.

The devices are characterized over full military temperature range of

-55

°C to +125°C.

FUNCTION TABLE

Note:

High clock transition.PINOUTS

PINOUTS

16-Pin DIP

Top View

16-Lead Flatpack

Top View

LOGIC SYMBOL

INPUTS

INTERNAL

OUTPUTS

OUTPUTS

SH/

LD

CLK

INH

CLK SER PARALLEL

A . . . H

L

X

X

X

a . . . h

a

b

h

h

H

L

L

X

X

H

L

↑

H

X

H

H

L

↑

L

X

L

H

H

X

X

X

1

2

3

4

5

7

6

16

15

14

13

12

10

11

SH/LD

CLK

E

F

G

H

CLK INH

D

C

B

A

SER

8

9

1

2

3

4

5

7

6

16

15

14

13

12

10

11

89

SH/LD

CLK

E

F

G

H

CLK INH

D

C

B

A

SER

(1)

SH/LD

(15)

CLK INH

C2/

C1 (LOAD)

Note:

1. Logic symbol in accordance with ANSI/IEEE Std 91-1984 and

IEC Publication 617-12.

(10)

SER

(11)

A

SRG8

(9)

(7)

≥1

(2)

CLK

2D

1D

(12)

B

(13)

C

(14)

D

(3)

E

(4)

F

(5)

G

(6)

H

1D

1D