Rev.2.00, Feb.18.2005, page 1 of 7

HD74LS373

Octal D-type Transparent Latches (with three-state outputs)

REJ03D0482–0200

Rev.2.00

Feb.18.2005

The HD74LS373, 8-bit register features totem-pole three-state outputs designed specifically for driving highly-

capacitive or relatively low-impedance loads. The high-impedance third state and increased high-logic-level drive

provide this register with the capacity of being connected directly to and driving the bus lines in a bus-organized system

without need for interface or pull-up components. They are particularly attractive for implementing buffer registers, I/O

ports, bidirectional bus drivers, and working registers.

The eight latches are transparent D-type latches meaning that while the enable (G) is high the Q outputs will follow the

data (D) inputs. When the enable is taken low the output will be latched at the level of the data that was setup.

Features

• Ordering Information

Part Name

Package Type

Package Code

(Previous Code)

Package

Abbreviation

Taping Abbreviation

(Quantity)

HD74LS373P

DILP-20 pin

PRDP0020AC-B

(DP-20NEV)

P

—

HD74LS373FPEL

SOP-20 pin (JEITA)

PRSP0020DD-B

(FP-20DAV)

FP

EL (2,000 pcs/reel)

HD74LS373RPEL

SOP-20 pin (JEDEC)

PRSP0020DC-A

(FP-20DBV)

RP

EL (1,000 pcs/reel)

Note:

Please consult the sales office for the above package availability.

Pin Arrangement

(Top view)

GND

Output

Control

1Q

1D

2D

2Q

3Q

3D

4D

4Q

8Q

7D

8D

7Q

6D

6Q

5D

Enable G

5Q

20

17

18

19

15

16

1

2

3

4

5

6

7

14

8

9

10

11

12

13

Q

D

G

OE

Q

D

G

OE

Q

D

G

OE

Q

D

G

OE

Q

D

G

OE

Q

D

G

OE

Q

D

G

OE

Q

D

G

OE