TRUTH TABLE

ABC

DY

LX

X

X

L

XL

X

X

L

XX

L

X

L

XXX

L

L

HHH

HH

PIN DESCRIPTION

PIN No

SYMBOL

NAME AND FUNCTION

1, 9

1A to 2A

Data Inputs

2, 10

1B to 2B

Data Inputs

3, 11

N C

Not Connected

4, 12

1C to 2C

Data Inputs

5, 13

1D to 2D

Data Inputs

6, 8

1Y to 2Y

Data Outputs

7

GND

Ground (0V)

14

Positive Supply Voltage

IEC LOGIC SYMBOL

SCHEMATIC CIRCUIT (Per Gate)

ABSOLUTE MAXIMUM RATINGS

Symbol

Parameter

Value

Unit

Supply Voltage

-0.5 to +7

V

DC Input Voltage

V

DC Output Voltage

V

DC Input Diode Current

± 20

mA

DC Output Diode Current

± 20

mA

DC Output Source Sink Current Per Output Pin

± 25

mA

± 50

mA

Power Dissipation

500 (*)

mW

Storage Temperature

-65 to +150

Lead Temperature (10 sec)

300

Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.

(*) 500 mW:

M54/M74HC21

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