HIT HD74HC244 Datasheet

HD74HC244

Octal Buffers/Line Drivers/Line Receivers

(with noninverted 3-state outputs)

Description

The HD74HC244 is a non-inverting buffer and has two active low enables (1G and 2G). Each enable
independently controls 4 buffers.

This device does not have schmitt trigger inputs.

Features

• High Speed Operation: tpd = 11 ns typ (CL = 50 pF)

• High Output Current: Fanout of 15 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 Output
G AY

HX Z
LH H
LL L

Notes H: high level

L: low level
X: irrelevant
Z: off (high-impedance) state of a 3-state output

HD74HC244

Pin Arrangement

1G

1

1

20

V

CC

1A
2Y
1A
2Y
1A
2Y
1A
2Y

GND

2

1

3

4

4

2

5

3

6

3

7

2

8

4

9

1

10

19
18
17
16
15
14
13
12
11

2G
1Y
2A
1Y
2A
1Y
2A
1Y
2A

1

4

2

3

3

2

4

1

(Top view)

Absolute Maximum Ratings

Item Symbol Rating Unit

Supply voltage range V
Input voltage V
Output voltage V
DC current drain per pin I
DC current drain per VCC, GND ICC, I
DC input diode current I
DC output diode current I
Power Dissipation per package P

CC

IN

OUT

OUT

GND

IK

OK

T

Storage temperature Tstg –65 to +150 °C

–0.5 to +7.0 V
–0.5 to VCC + 0.5 V
–0.5 to VCC + 0.5 V

±35 mA
±75 mA
±20 mA
±20 mA

500 mW

2

Logic Diagram

Strobe G

Input A

To three other
7 inverters

V

CC

HD74HC244

One of 8
inverters

Y

3