HIT HD74LVC245A Datasheet

HD74LVC245A

Octal Bidirectional Transceivers with 3-state Outputs

ADE-205-111B(Z)

3rd Edition

December 1996

Description

The HD74LVC245A has eight buffers with three state outputs in a 20 pin package. When (T / R) is high,
data flows from the A inputs to the B outputs, and when (T / R) is low, data flows from the B inputs to the
A outputs. A and B bus are separated by making enable input (OE) high level. 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 input 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)

I/O

Function Table

Inputs

OE T / R Operation

L L B data to A bus
L H A data to B bus
HX Z

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

HD74LVC245A

Pin Arrangement

T / R

V

1

20

CC

A0

2
3

A1 B0

4

A2
A3

5

A4

6
7

A5
A6

8
9

A7

10

GND

19
18
17

16
15

14
13
12

11

OE

B1
B2

B3
B4
B5
B6
B7

(Top view)

Absolute Maximum Ratings

Item Symbol Ratings Unit Conditions

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

Input / output voltage V

Output current I
VCC, GND current / pin I

IK

OK

O

CC

CC

I

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 T / R, OE
–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" or VCC:OFF
±50 mA
100 mA

2

HD74LVC245A

Recommended Operating Conditions

Item Symbol Ratings Unit Conditions

Supply voltage V

Input / output voltage V

CC

I

V

I/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 T / R, OE
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