HD74LS640

Rev.2.00, Feb.18.2005, page 2 of 6

Block Diagram

A

B

Direction

Control DIR

Transceiver (1/8)

Enable

G

Absolute Maximum Ratings

Item

Symbol

Ratings

Unit

Supply voltage

7

V

Input voltage

7

V

Power dissipation

400

mW

Storage temperature

Tstg

–65 to +150

°C

Note:

Voltage value, unless otherwise noted, are with respect to network ground terminal.

Recommended Operating Conditions

Item

Symbol

Min

Typ

Max

Unit

Supply voltage

4.75

5.00

5.25

V

—

—

–15

mA

Output current

—

—

24

mA

Operating temperature

Topr

–20

25

75

°C

Electrical Characteristics

(Ta = –20 to +75 °C)

Item

Symbol

min.

typ.*

max.

Unit

Condition

2.0

—

—

V

Input voltage

—

—

0.8

V

Hysteresis

T

–

0.2

—

—

V

2.4

—

—

V

2

—

—

V

—

—

0.4

V

Output voltage

—

—

0.5

V

—

—

20

µA

Output current

—

—

–400

µA

G input = 2 V

—

—

20

µA

—

—

–400

µA

A or B

—

—

0.1

mA

Input

current

DIR or

G

—

—

0.1

mA

Short-circuit output current

–40

—

–225

mA

—

48

70

mA

—

62

90

mA

Supply current

—

64

95

mA

Input clamp voltage

—

—

–1.5

V

** Not more than one output shall be shorted at a time. the duration of the short circuit shall not exceed one

second.