HD74LS642 Datasheet, PDF (2/7 Pages) Hitachi Semiconductor – Octal Bus Transceivers(inverted open-collector outputs)

HD74LS642
Function Table
Note:
Enable
G
L
L
H
H; high level, L; low level, X; irrelevant
Direction Control
DIR
L
H
X
Operation
B data to A bus
A data to B bus
Isolation
Block Diagram
Enable G
Transceiver (1/8)
B
A
Direction
Control DIR
Absolute Maximum Ratings
Item
Symbol
Ratings
Supply voltage
V_CC
7
Input voltage
V_IN
7
Power dissipation
P_T
400
Storage temperature
Tstg
–65 to +150
Note: Voltage value, unless otherwise noted, are with respect to network ground terminal.
Recommended Operating Conditions
Item
Supply voltage
Output voltage
Output current
Operating temperature
Symbol
V_CC
V_OH
I_OL
Topr
Min
4.75
—
—
–20
Typ
5.00
—
—
25
Max
5.25
5.5
24
75
Unit
V
V
mW
°C
Unit
V
V
mA
°C
Rev.2.00, Feb.18.2005, page 2 of 6