HIT HD74LVCZ244A Datasheet

HD74LVCZ244A

Octal Buffers / Line Drivers with 3–state Outputs

ADE-205-230A (Z)

2nd. Edition

February 1999

Description

The HD74LVCZ244A has eight line drivers with three state outputs in a 20 pin package. This device is a
noninverting buffer and has two active low enables (1G and 2G). Each enable independently controls four
buffers.

When VCC is between 0 and 1.5 V, the device is in the high impedance state during power up or power
down.

Low voltage and high speed operation is suitable at battery drive product (note type personal computer) and
low power consumption extends the life of a battery for long time operation.

Features

• VCC = 2.7 to 5.5 V

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

• All outputs VO (Max) = 5.5 V (@VCC = 0 V or output off state)

• 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 impedance state during power up and power down

• Power off disables outputs, permitting live insertion

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

HD74LVCZ244A

Function Table

Inputs Output Y
G A

HXZ
LHH
LLL

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

Pin Arrangement

V

1G

1

20

CC

1A1
2Y4

1A2
2Y3
1A3

2Y2
1A4

2Y1

GND

10

2
3
4
5

6
7
8
9

(Top view)

19
18
17
16
15
14
13
12
11

2G
1Y1

2A4
1Y2
2A3

1Y3
2A2
1Y4

2A1

2

HD74LVCZ244A

Absolute Maximum Ratings

Item Symbol Ratings Unit Conditions

Supply voltage V
Input voltage V
Output voltage V

Input diode current I
Output diode current I
Output current I
VCC, GND current ICC or I

CC

I

O

IK

OK

O

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.

Recommended Operating Conditions

–0.5 to 7.0 V
–0.5 to 7.0 V
–0.5 to 7.0 V Output “Z” or VCC : OFF
–0.5 to VCC+0.5 Output “H” or “L”
–50 mA VI < 0
–50 mA VO < 0

±50 mA
±100 mA

Item Symbol Ratings Unit Conditions

Supply voltage V
Input voltage V
Output voltage V

Output current I

OH

I

OL

Input rise / fall time tr, t

CC

I

O

f

2.7 to 5.5 V At operation
0 to 5.5 V
0 to 5.5 V Output “Z” or VCC : OFF
0 to V

CC

Output “H” or “L”

–12 mA VCC = 2.7 V

*1

–24

VCC = 3.0 to 5.5 V

12 VCC = 2.7 V

*1

24

VCC = 3.0 to 5.5 V

0 to 6 ns / V

Operating temperature Ta –40 to +85 °C
Note: 1. Duty cycle ≤ 50%

3

HD74LVCZ244A

Logic Diagram

1

1G

2

1A1

416

1A2

614

1A3

812

1A4

18

1Y1

1Y2

1Y3

1Y4

19

2G

11

2A1

13 7

2A2

15 5

2A3

17 3

2A4

9

2Y1

2Y2

2Y3

2Y4

4