HIT HD74HC273 Datasheet

HD74HC273

Octal D-type Flip-Flops (with Clear)

Description

This device contains 8 master-slave flip-flops with a common clock and common clear. Data on the D
input having the specified setup and hold times is transferred to the Q output on the low to high transition
of the clock input. The clear input when low, sets all outputs to a low state.

Features

• High Speed Operation: tpd (Clock to Q) = 18 ns typ (CL = 50 pF)

• High Output Current: Fanout of 10 LSTTL Loads

• Wide Operating Voltage: VCC = 2 to 6 V

• Low Input Current: 1 µA max

• Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)

Function Table

Inputs Outputs
Clear Clock D Q

LX X L
H HH
H LL
H L X No change
H X No change

HD74HC273

Pin Arrangement

Clear

1Q

1D

2D

2Q

3Q

3D

4D

4Q

GND

10

1

2

3

4

5

6

7

8

9

Q

Clear Clear

D

CK

D

CK

Clear Clear

Q

Q

Clear Clear

CK

D

D

CK

Clear Clear

Q

CK

CK

CK

CK

20

V

CC

19

18

17

16

15

14

13

12

11

8Q

8D

7D

7Q

6Q

6D

5D

5Q

Clock

Q

D

D

Q

Q

D

D

Q

(Top view)

2

Logic Diagram

HD74HC273

Clock

1D

Clear

2D

3D

4D

5D

6D

7D

CK

Q

D

CL

CK

Q

D

CL

CK

Q

D

CL

CK

Q

D

CL

CK

Q

D

CL

CK

Q

D

CL

CK

Q

D

CL

1Q

2Q

3Q

4Q

5Q

6Q

7Q

8D

CK

Q

D

CL

8Q

3