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

HD74LS374

Octal D-type Edge-triggered Flip-Flops (with three-state outputs)

REJ03D0483–0200

Rev.2.00

Feb.18.2005

The HD74LS374, 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 capability 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 flip-flops are edge-triggered D-type flip-

flops. On the positive transition the clock, the Q outputs will be set to the logic states that ware setup at the D inputs.

Features

• Ordering Information

Part Name

Package Type

Package Code

(Previous Code)

Package

Abbreviation

Taping Abbreviation

(Quantity)

HD74LS374P

DILP-20 pin

PRDP0020AC-B

(DP-20NEV)

P

—

HD74LS374FPEL

SOP-20 pin (JEITA)

PRSP0020DD-B

(FP-20DAV)

FP

EL (2,000 pcs/reel)

HD74LS374RPEL

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

Clock

5Q

20

17

18

19

15

16

1

2

3

4

5

6

7

14

8

9

10

11

12

13

Q

D

CK

OE

Q

D

CK

OE

Q

D

CK

OE

Q

D

CK

OE

Q

D

CK

OE

Q

D

CK

OE

Q

D

CK

OE

Q

D

CK

OE