H = HIGH Voltage Level

L = LOW Voltage Level

X = Immaterial

5-317

FAST AND LS TTL DATA

SN54/74LS173A

LOGIC DIAGRAM

CP

MR

Q0

Q1

Q2

Q3

D0

D1

D2

D3

CP

Q

D

Q

IE1

IE2

OE2

OE1

14

6

7

3

4

5

9

11

12

10

13

15

D

D

D

1

2

VCC = PIN 16

GND = PIN 8

= PIN NUMBERS

TRUTH TABLE

MR

CP

IE1

IE2

Dn

Qn

H

x

x

x

x

L

L

L

x

x

x

Qn

L

H

x

x

Qn

L

x

H

x

Qn

L

L

L

L

L

L

L

L

H

H

When either OE1, or OE2 are HIGH, the output is in the off state (High Impedance);

however this does not affect the contents or sequential operation of the register.

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

54

74

– 1.0

– 2.6

mA

IOL

Output Current — Low

54

74

12

24

mA