5-360

FAST AND LS TTL DATA

4-BIT BIDIRECTIONAL

UNIVERSAL SHIFT REGISTER

The SN54 / 74LS194A is a High Speed 4-Bit Bidirectional Universal Shift

Register. As a high speed multifunctional sequential building block, it is useful

in a wide variety of applications. It may be used in serial-serial, shift left, shift

right, serial-parallel, parallel-serial, and parallel-parallel data register trans-

fers. The LS194A is similar in operation to the LS195A Universal Shift

Register, with added features of shift left without external connections and

hold (do nothing) modes of operation. It utilizes the Schottky diode clamped

process to achieve high speeds and is fully compatible with all Motorola TTL

families.

CONNECTION DIAGRAM DIP (TOP VIEW)

14

13

12

11

10

9

1

2

3

4

5

6

7

16

15

8

VCC

MR

Q0

Q1

Q2

Q3

S1

CP

S0

DSR P0

P1

P2

P3

DSL GND

PIN NAMES

LOADING (Note a)

HIGH

LOW

S0, S1

Mode Control Inputs

0.5 U.L.

0.25 U.L.

P0 – P3

Parallel Data Inputs

0.5 U.L.

0.25 U.L.

DSR

Serial (Shift Right) Data Input

0.5 U.L.

0.25 U.L.

DSL

Serial (Shift Left) Data Input

0.5 U.L.

0.25 U.L.

CP

Clock (Active HIGH Going Edge) Input

0.5 U.L.

0.25 U.L.

MR

Master Reset (Active LOW) Input

0.5 U.L.

0.25 U.L.

Q0 – Q3

Parallel Outputs (Note b)

10 U.L.

5 (2.5) U.L.

NOTES:

a. 1 TTL Unit Load (U.L.) = 40

µA HIGH/1.6 mA LOW.

b. The Output LOW drive factor is 2.5 U.L. for Military (54) and 5 U.L. for Commercial (74)

SN54/74LS194A

4-BIT BIDIRECTIONAL

UNIVERSAL SHIFT REGISTER

LOW POWER SCHOTTKY

J SUFFIX

CERAMIC

CASE 620-09

N SUFFIX

PLASTIC

CASE 648-08

16

1

16

1

ORDERING INFORMATION

SN54LSXXXJ

Ceramic

SN74LSXXXN

Plastic

SN74LSXXXD

SOIC

16

1

D SUFFIX

SOIC

CASE 751B-03