HIT HD74BC540A Datasheet

HD74BC540A

Octal Buffers/Line Drivers With 3 State Outputs

ADE-205-031 (Z)

Rev. 0

June 1993

Description

The HD74BC540A provides high drivability and operation equal to or better than high speed bipolar
standard logic IC by using Bi-CMOS process. The device features low power dissipation that is about 1/5
of high speed bipolar logic IC, when the frequency is 10 MHz. The device has eight inverter drivers with
three state outputs in a 20 pin package. When G1 and G2 is low level, this drivers set up output is enable.

Features

• Input/Output are at high impedance state when power supply is off.

• Built in input pull up circuit can make input pins be open, when not used.

• Input is TTL level.

• Wide operating temperature range

Ta = –40 to +85°C

Function Table

Inputs
G1 G2 A Output Y

LL L H
LL H L
HX X Z
XH X Z

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

HD74BC540A

Pin Arrangement

G1
A1
A2
A3
A4
A5
A6

A7
A8

GND

10

1
2
3
4
5

6
7

8

9

20
19
18
17
16
15
14
13
12
11

V
G2
Y1

Y2
Y3
Y4
Y5

Y6
Y7
Y8

CC

(Top view)

Absolute Maximum Ratings

Item Symbol Rating Unit

Supply voltage V
Input diode current I
Input voltage V
Output voltage V
Off state output voltage V

CC

IK

IN

OUT

OUT(off)

Storage temperature Tstg –65 to +150 °C
Note: 1. 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 +7.0 V
±30 mA
–0.5 to +7.5 V
–0.5 to +7.5 V
–0.5 to +5.5 V

2

HD74BC540A

Recommended Operating Conditions

Item Symbol Min Typ Max Unit

Supply voltage V
Input voltage V
Ouput voltage V

CC

IN

OUT

Operating temperature Topr –40 — 85 °C
Input rise/fall time*

1

tr , t

f

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

Waveform: Refer to test circuit of switching characteristics.

Logic Diagram

G1
G2

4.5 5.0 5.5 V
0—VCCV
0—VCCV

0 — 8 ns/V

A1

A2

A3

A4

A5

A6

A7

A8

Y1

Y2

Y3

Y4

Y5

Y6

Y7

Y8

3