5-1

FAST AND LS TTL DATA

8-BIT SHIFT REGISTERS

WITH SIGN EXTEND

These 8-bit shift registers have multiplexed input/output data ports to

accomplish full 8-bit data handling in a single 20-pin package. Serial data may

enter the shift-right register through either D0 or D1 inputs as selected by the

data select pin. A serial output is also provided. Synchronous parallel loading

is achieved by taking the register enable and the S / P inputs low. This places

the three-state input / output ports in the data input mode. Data is entered on

the low-to-high clock transition. The data extend function repeats the sign in

the QA flip-flop during shifting. An overriding clear input clears the internal

registers when taken low whether the outputs are enabled or off. The output

enable does not affect synchronous operation of the register.

VCC

DATA

SELECT

SIGN

EXTEND D1

B/QB D/QD F/QF H/QH

Q/H CLOCK

D0

A/QA C/QC E/QE G/QG

S/P

REGISTER

ENABLE

OUTPUT

ENABLE

CLEAR GND

(TOP VIEW)

18

17

16

15

14

13

1

2

3

4

5

6

7

20

19

8

9

10

12

11

DS

SE

D1

B/QB D/QD F/QF H/GH Q/H

G

CK

S/P

D0

A/QA C/QC

E/QE G/QG OE

CLR

GUARANTEED OPERATING RANGES

Symbol

Parameter

Min

Typ

Max

Unit

VCC

Supply Voltage

54

74

4.5

4.75

5.0

5.0

5.5

5.25

V

TA

Operating Ambient Temperature Range

54

74

– 55

0

25

25

125

70

°C

IOH

Output Current — High

QH′

54, 74

– 0.4

mA

IOL

Output Current — Low

QH′

QH′

54

74

4.0

8.0

mA

IOH

Output Current — High

QA– QH

QA– QH

54

74

– 1.0

– 2.6

mA

IOL

Output Current — Low

QA– QH

QA– QH

54

74

12

24

mA

SN54/74LS322A

8-BIT SHIFT REGISTERS

WITH SIGN EXTEND

LOW POWER SCHOTTKY

ORDERING INFORMATION

SN54LSXXXJ

Ceramic

SN74LSXXXN

Plastic

SN74LSXXXDW SOIC

20

1

J SUFFIX

CERAMIC

CASE 732-03

20

1

N SUFFIX

PLASTIC

CASE 738-03

20

1

DW SUFFIX

SOIC

CASE 751D-03