© Semiconductor Components Industries, LLC, 2014

August, 2014 − Rev. 15

1

Publication Order Number:

MC74HC373A/D

MC74HC373A

Octal 3-State Non-Inverting

Transparent Latch

High−Performance Silicon−Gate CMOS

The MC74HC373A is identical in pinout to the LS373. The device

inputs are compatible with standard CMOS outputs; with pullup

resistors, they are compatible with LSTTL outputs.

These latches appear transparent to data (i.e., the outputs change

asynchronously) when Latch Enable is high. When Latch Enable goes

low, data meeting the setup and hold time becomes latched.

The Output Enable input does not affect the state of the latches, but

when Output Enable is high, all device outputs are forced to the

high−impedance state. Thus, data may be latched even when the

outputs are not enabled.

The HC373A is identical in function to the HC573A which has the

data inputs on the opposite side of the package from the outputs to

facilitate PC board layout.

The HC373A is the non−inverting version of the HC533A.

Features

DATA

INPUTS

D0

D1

D2

D3

D4

D5

D6

D7

18

17

14

13

8

7

4

3

1

OUTPUT ENABLE

19

Q0

Q1

Q2

Q3

Q4

Q5

Q6

Q7

16

15

12

9

6

5

2

PIN 10 = GND

NONINVERTING

OUTPUTS

11

LATCH ENABLE

LOGIC DIAGRAM

http://onsemi.com

MARKING DIAGRAMS

See detailed ordering and shipping information in the package

dimensions section on page 5 of this data sheet.

ORDERING INFORMATION

1

20

SOIC−20

HC373A

AWLYYWWG

HC

373A

ALYW

G

G

TSSOP−20

20

1

A

= Assembly Location

WL, L

= Wafer Lot

YY, Y

= Year

WW, W

= Work Week

G or

G

= Pb−Free Package

(Note: Microdot may be in either location)

SOIC−20

DW SUFFIX

CASE 751D

TSSOP−20

DT SUFFIX

CASE 948E

FUNCTION TABLE

Inputs

Output

Output

Latch

Enable

Enable

D

Q

LH

H

H

LH

L

L

L

L

X

No Change

HX

X

Z

X = Don’t Care

Z = High Impedance

PIN ASSIGNMENT

Q2

D1

D0

Q0

OUTPUT

ENABLE

GND

Q3

D3

D2

Q1

5

4

3

2

1

10

9

8

7

6

14

15

16

17

18

19

20

11

12

13

Q6

D6

D7

Q7

LATCH

ENABLE

Q4

D4

D5

Q5