SN54HC373, SN74HC373

OCTAL TRANSPARENT D-TYPE LATCHES

WITH 3-STATE OUTPUTS

SCLS140B – DECEMBER 1982 – REVISED MAY 1997

1

POST OFFICE BOX 655303

Package

Drive up to 15 LSTTL Loads

Small-Outline (DW), Shrink Small-Outline

(DB), Thin Shrink Small-Outline (PW), and

Ceramic Flat (W) Packages, Ceramic Chip

Carriers (FK), and Standard Plastic (N) and

Ceramic (J) 300-mil DIPs

description

These 8-bit latches feature 3-state outputs

designed specifically for driving highly capacitive

or relatively low-impedance loads. They are

particularly suitable for implementing buffer

registers, I/O ports, bidirectional bus drivers, and

working registers.

The eight latches of the ’HC373 are transparent

D-type latches. While the latch-enable (LE) input

is high, the Q outputs follow the data (D) inputs.

When LE is taken low, the Q outputs are latched

at the levels that were set up at the D inputs.

An output-enable (OE) input places the eight

outputs in either a normal logic state (high or low

logic levels) or the high-impedance state. In the

high-impedance state, the outputs neither load

nor

drive

the

bus

lines

significantly.

The

high-impedance

state

and

increased

drive

provide the capability to drive bus lines without

interface or pullup components.

OE does not affect the internal operations of the latches. Old data can be retained or new data can be entered

while the outputs are off.

The SN54HC373 is characterized for operation over the full military temperature range of –55

°C to 125°C. The

SN74HC373 is characterized for operation from –40

°C to 85°C.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

32 1 20 19

910 11 1213

4

5

6

7

8

18

17

16

15

14

8D

7D

7Q

6Q

6D

2D

2Q

3Q

3D

4D

SN54HC373 . . . FK PACKAGE

(TOP VIEW)

SN54HC373 ...J OR W PACKAGE

SN74HC373 . . . DB, DW, N, OR PW PACKAGE

(TOP VIEW)

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

OE

1Q

1D

2D

2Q

3Q

3D

4D

4Q

GND

8Q

8D

7D

7Q

6Q

6D

5D

5Q

LE

Copyright

© 1997, Texas Instruments Incorporated

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.