HD74HC21

Rev.2.00, Oct 06, 2005 page 2 of 6

Pin Arrangement

1

2

3

4

5

6

7

1A

1B

NC

1C

1D

1Y

GND

2D

2C

NC

2B

2A

2Y

14

13

12

11

10

9

8

(Top view)

Absolute Maximum Ratings

Item

Symbol

Ratings

Unit

Supply voltage range

–0.5 to 7.0

V

Input / Output voltage

Vin, Vout

V

Input / Output diode current

±20

mA

Output current

±25

mA

±50

mA

Power dissipation

500

mW

Storage temperature

Tstg

–65 to +150

°C

Note:

The absolute maximum ratings are values, which must not individually be exceeded, and furthermore, no two of

which may be realized at the same time.

Recommended Operating Conditions

Item

Symbol

Ratings

Unit

Conditions

Supply voltage

2 to 6

V

Input / Output voltage

V

Operating temperature

Ta

–40 to 85

°C

0 to 1000

0 to 500

Input rise / fall time

*1

0 to 400

ns

Note:

1. This item guarantees maximum limit when one input switches.

Waveform: Refer to test circuit of switching characteristics.