SN74LS194A

http://onsemi.com

4

MODE SELECT — TRUTH TABLE

OPERATING MODE

INPUTS

OUTPUTS

OPERATING MODE

MR

Reset

L

X

X

X

X

X

L

L

L

L

Hold

H

I

I

X

X

X

Shift Left

H

h

I

X

I

X

L

H

h

I

X

h

X

H

Shift Right

H

I

h

I

X

X

L

H

I

h

h

X

X

H

Parallel Load

H

h

h

X

X

L = LOW Voltage Level

H = HIGH Voltage Level

X = Don’t Care

I = LOW voltage level one set-up time prior to the LOW to HIGH clock transition

h = HIGH voltage level one set-up time prior to the LOW to HIGH clock transition

Limits

Symbol

Parameter

Min

Typ

Max

Unit

Test Conditions

Input HIGH Voltage

2.0

V

Guaranteed Input HIGH Voltage for

All Inputs

Input LOW Voltage

0.8

V

Guaranteed Input LOW Voltage for

All Inputs

Input Clamp Diode Voltage

– 0.65

– 1.5

V

Output HIGH Voltage

2.7

3.5

V

Output LOW Voltage

0.25

0.4

V

Output LOW Voltage

0.35

0.5

V

per Truth Table

I

Input HIGH Current

20

µA

Input HIGH Current

0.1

mA

Input LOW Current

– 0.4

mA

Short Circuit Current (Note 1)

–20

– 100

mA

Power Supply Current

23

mA

Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.

Limits

Symbol

Parameter

Min

Typ

Max

Unit

Test Conditions

Maximum Clock Frequency

25

36

MHz

Propagation Delay,

Clock to Output

14

17

22

26

ns

Propagation Delay,

MR to Output

19

30

ns

15 F