HIT HD74HCT244 Datasheet

HD74HCT244

Octal Buffers/Line Drivers/Line Receivers

(noninverted 3-state outputs)

Description

The HD74HCT244 is a non-inverting buffer and has two active low enable (1G and 2G). Each enable
independently controls 4 buffers.

This device does not have schmitt trigger inputs.

Features

• LSTTL Output Logic Level Compatibility as well as CMOS Output Compatibility

• High Speed Operation: tpd (A to Y) = 10 ns typ (CL = 50 pF)

• High Output Current: Fanout of 15 LSTTL Loads

• Wide Operating Voltage: VCC = 4.5 to 5.5 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

H : High level
L : Low level
X : Irrelevant
Z : Off (high-impedance) state of a 3-state output

HD74HCT244

Pin Arrangement

1G

1A

1
2

1

20
19

V
2G

CC

Block Diagram

Input A

2Y4
1A2
2Y3
1A3
2Y2
1A4
2Y1

GND

3
4
5
6
7
8
9

10

(Top view)

To three other inverters

18
17
16
15
14
13
12
11

V

CC

1Y
2A4
1Y2
2A3
1Y3
2A2
1Y4
2A1

1

One of 8
inverters

Y

Strobe G

2

HD74HCT244

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

DC Characteristics

Ta = –40 to

Ta = 25°C

Item Symbol Min Typ Max Min Max Unit V

Input voltage V

Output voltage V

IH

V

IL

OH

2.0 — — 2.0 — V 4.5 to

— — 0.8 — 0.8 V 4.5 to

4.4 — — 4.4 — V 4.5 Vin = VIH or VILIOH = –20 µA

4.18 — — 4.13 — 4.5 IOH = –6 mA

V

OL

— — 0.1 — 0.1 V 4.5 Vin = VIH or VILIOL = 20 µA
— — 0.26 — 0.33 4.5 IOL = 6 mA

Off-state output

I

OZ

——±0.5 — ±5.0 µA 5.5 Vin = VIH or VIL,

current
Input current Iin — — ±0.1 — ±1.0 µA 5.5 Vin = VCC or GND
Quiescent current I

CC

— — 4.0 — 40 µA 5.5 Vin = VCC or GND, Iout = 0 µA

+85°C Test Conditions

–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

(V)

CC

5.5

5.5

Vout = V

or GND

CC

3