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74ALS257DB データシート(PDF) 4 Page - NXP Semiconductors

部品番号 74ALS257DB
部品情報  Data selector/multiplexer
Download  11 Pages
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メーカー  PHILIPS [NXP Semiconductors]
ホームページ  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

74ALS257DB データシート(HTML) 4 Page - NXP Semiconductors

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Philips Semiconductors
Product specification
74ALS257/74ALS258
Data selector/multiplexer
1991 Feb 08
4
FUNCTION TABLE – 74ALS257
INPUTS
OUTPUT
OE
S
I0n
I1n
Yn
H
X
X
X
Z
L
L
L
X
L
L
L
H
X
H
L
H
X
L
L
L
H
X
H
H
H = High voltage level
L
= Low voltage level
X = Don’t care
Z = High impedance “off” state
FUNCTION TABLE – 74ALS258
INPUTS
OUTPUT
OE
S
I0n
I1n
Yn
H
X
X
X
Z
L
L
L
X
H
L
L
H
X
L
L
H
X
L
H
L
H
X
H
L
H = High voltage level
L
= Low voltage level
X = Don’t care
Z = High impedance “off” state
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
RATING
UNIT
VCC
Supply voltage
–0.5 to +7.0
V
VIN
Input voltage
–0.5 to +7.0
V
IIN
Input current
–30 to +5
mA
VOUT
Voltage applied to output in High output state
–0.5 to VCC
V
IOUT
Current applied to output in Low output state
48
mA
Tamb
Operating free-air temperature range
0 to +70
°C
Tstg
Storage temperature range
–65 to +150
°C
RECOMMENDED OPERATING CONDITIONS
SYMBOL
PARAMETER
LIMITS
UNIT
SYMBOL
PARAMETER
MIN
NOM
MAX
UNIT
VCC
Supply voltage
4.5
5.0
5.5
V
VIH
High-level input voltage
2.0
V
VIL
Low-level input voltage
0.8
V
IIK
Input clamp current
–18
mA
IOH
High-level output current
–2.6
mA
IOL
Low-level output current
24
mA
Tamb
Operating free-air temperature range
0
+70
°C


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