HIT HD74LVC244A Datasheet

HD74LVC244A

Octal Buffers / Line Drivers with 3-state Outputs

ADE-205-110B(Z)

3rd Edition

December 1996

Description

The HD74LVC244A has eight line drivers with three state outputs in a 20 pin package. This device is a
non inverting buffer and has two active low enables (1G and 2G). Each enable independently controls four
buffers. Low voltage and high speed operation is suitable at the battery drive product (note type personal
computer) and low power consumption extends the life of a battery for long time operation.

Features

• VCC = 2.0 V to 5.5 V

• All inputs VIH (Max.) = 5.5 V (@VCC = 0 V to 5.5 V)

• All outputs V

• Typical VOL ground bounce < 0.8 V (@VCC = 3.3 V, Ta = 25°C)

• Typical VOH undershoot > 2.0 V (@VCC = 3.3 V, Ta = 25°C)

• High output current ±24 mA (@VCC = 3.0 V to 5.5 V)

(Max.) = 5.5 V (@VCC = 0 V or output off state)

OUT

Function Table

Inputs

G A Output Y

HX Z
LHH
LL L

H : High level
L : Low level
X : Immaterial
Z : High impedance

HD74LVC244A

Pin Arrangement

1G
1A1
2Y4
1A2
2Y3
1A3
2Y2

V

1
2
3
4
5

6
7

20
19
18
17
16
15
14

CC

2G
1Y1

2A4
1Y2
2A3
1Y3

1A4

2Y1

GND

8

9

10

13
12
11

2A2
1Y4
2A1

(Top view)

Absolute Maximum Ratings

Item Symbol Ratings Unit Conditions

Supply voltage V
Input diode current I
Input voltage V
Output diode current I

Output voltage V

Output current I
VCC, GND current / pin I

IK

OK

O

CC

CC

I

O

or I

GND

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.

–0.5 to 6.0 V
–50 mA VI = –0.5 V
–0.5 to 6.0 V
–50 mA VO = –0.5 V
50 mA VO = V

+0.5 V

CC

–0.5 to VCC +0.5 V Output "H" or "L"
–0.5 to 6.0 V Output "Z" VCC:OFF
±50 mA
100 mA

2

HD74LVC244A

Recommended Operating Conditions

Item Symbol Ratings Unit Conditions

Supply voltage V

Input / output voltage V

CC

I

V

O

Operating temperature Ta –40 to 85 °C
Output current I

Input rise / fall time

*1

OH

I

OL

tr, t

f

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

Waveform : Refer to test circuit of switching characteristics.

2. duty cycle ≤ 50%

1.5 to 5.5 V Data retention

2.0 to 5.5 V At operation
0 to 5.5 V G, A
0 to V

CC

V Output "H" or "L"

0 to 5.5 V Output "Z" or VCC:OFF

–12 mA VCC = 2.7 V

*2

–24

mA VCC = 3.0 V to 5.5 V

12 mA VCC = 2.7 V

*2

24

mA VCC = 3.0 V to 5.5 V

10 ns/V

3