74ALS257 Просмотр технического описания (PDF) - Philips Electronics
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74ALS257 Datasheet PDF : 11 Pages
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Philips Semiconductors
Data selector/multiplexer
Product specification
74ALS257/74ALS258
FUNCTION TABLE – 74ALS257
INPUTS
OE
S
I0n
I1n
H
X
X
X
L
L
L
X
L
L
H
X
L
H
X
L
L
H
X
H
H = High voltage level
L = Low voltage level
X = Don’t care
Z = High impedance “off” state
OUTPUT
Yn
Z
L
H
L
H
FUNCTION TABLE – 74ALS258
INPUTS
OE
S
I0n
I1n
H
X
X
X
L
L
L
X
L
L
H
X
L
H
X
L
L
H
X
H
H = High voltage level
L = Low voltage level
X = Don’t care
Z = High impedance “off” state
OUTPUT
Yn
Z
H
L
H
L
ABSOLUTE MAXIMUM RATINGS
(Operation beyond the limit set forth in this table may impair the useful life of the device.
Unless otherwise noted these limits are over the operating free air temperature range.)
SYMBOL
PARAMETER
VCC
VIN
IIN
VOUT
IOUT
Tamb
Tstg
Supply voltage
Input voltage
Input current
Voltage applied to output in High output state
Current applied to output in Low output state
Operating free-air temperature range
Storage temperature range
RATING
–0.5 to +7.0
–0.5 to +7.0
–30 to +5
–0.5 to VCC
48
0 to +70
–65 to +150
UNIT
V
V
mA
V
mA
°C
°C
RECOMMENDED OPERATING CONDITIONS
SYMBOL
PARAMETER
VCC
VIH
VIL
IIK
IOH
IOL
Tamb
Supply voltage
High-level input voltage
Low-level input voltage
Input clamp current
High-level output current
Low-level output current
Operating free-air temperature range
LIMITS
MIN NOM MAX
4.5
5.0
5.5
2.0
0.8
–18
–2.6
24
0
+70
UNIT
V
V
V
mA
mA
mA
°C
1991 Feb 08
4
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