5-522

FAST AND LS TTL DATA

SN54/74LS373

• SN54/74LS374

TRUTH TABLE

LS373

Dn

LE

OE

On

H

H

L

H

L

H

L

L

X

L

L

Q0

X

X

H

Z*

LS374

Dn

LE

OE

On

H

L

H

L

L

L

X

X

H

Z*

H = HIGH Voltage Level

L = LOW Voltage Level

X = Immaterial

Z = High Impedance

* Note: Contents of flip-flops unaffected by the state of the Output Enable input (OE).

LOGIC DIAGRAMS

SN54LS / 74LS373

SN54LS / 74LS374

D

D

G

Q

CP

Q Q

CP

OE

OE

LE

LATCH

ENABLE

O0

O1

O2

O3

O4

O5

O6

O7

D0

14

1

2

6

7

3

8

4

5

9

11

12

16

13

15

VCC = PIN 20

GND = PIN 10

= PIN NUMBERS

D

G

Q

D1

D

G

Q

D2

D

G

Q

D3

D

G

Q

D4

D

G

Q

D5

D

G

Q

D6

D

G

Q

D7

17

18

19

O0

O1

O2

O3

O4

O5

O6

O7

2

6

5

9

12

16

15

19

D0

14

7

3

8

4

13

D1

D2

D3

D4

D5

D6

D7

17

18

1

11

D

CP

Q Q

D

CP

Q Q

D

CP

Q Q

D

CP

Q Q

D

CP

Q Q

D

CP

Q Q

D

CP

Q Q

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