HD74LS257 Datasheet, PDF (2/6 Pages) Hitachi Semiconductor – Quadruple 2-line-to-1-line Data Selectors/Multiplexers(with non inverted 3-state outputs)

HD74LS257
Function Table
Note:
Inputs
OC
S
A
B
H
X
X
X
L
L
L
X
L
L
H
X
L
H
X
L
L
H
X
H
H; high level, L; low level, X; irrelevant, Z; off (high-impedance) state of a 3-state output
Block Diagram
Output
Control
1A
1B
1Y
2A
2B
2Y
3A
3B
3Y
4A
4B
4Y
Output
Z
L
H
L
H
S
Absolute Maximum Ratings
Item
Symbol
Ratings
Supply voltage
V_CC
7
Input voltage
V_IN
7
Output voltage (off-state)
V_{O (off)}
5.5
Operating temperature
Topr
–20 to +75
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 current
Operating temperature
Symbol
V_CC
I_OH
I_OL
Topr
Min
4.75
—
—
–20
Typ
5.00
—
—
25
Max
5.25
–2.6
8
75
Unit
V
V
V
°C
mW
°C
Unit
V
mA
mA
°C
Rev.3.00, Jul.15.2005, page 2 of 5