74HC251 查看數據表（PDF） - NXP Semiconductors.
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74HC251 Datasheet PDF : 18 Pages
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Nexperia
74HC251; 74HCT251
8-input multiplexer; 3-state
6. Functional description
Table 3. Function table[1]
Input
Output
OE S2
S1
S0
I0
I1
I2
I3
I4
I5
I6
I7
Y
Y
H
X
X
X
X
X
X
X
X
X
X
X
Z
Z
L
L
L
L
L
X
X
X
X
X
X
X
H
L
L
L
L
L
H
X
X
X
X
X
X
X
L
H
L
L
L
H
X
L
X
X
X
X
X
X
H
L
L
L
L
H
X
H
X
X
X
X
X
X
L
H
L
L
H
L
X
X
L
X
X
X
X
X
H
L
L
L
H
L
X
X
H
X
X
X
X
X
L
H
L
L
H
H
X
X
X
L
X
X
X
X
H
L
L
L
H
H
X
X
X
H
X
X
X
X
L
H
L
H
L
L
X
X
X
X
L
X
X
X
H
L
L
H
L
L
X
X
X
X
H
X
X
X
L
H
L
H
L
H
X
X
X
X
X
L
X
X
H
L
L
H
L
H
X
X
X
X
X
H
X
X
L
H
L
H
H
L
X
X
X
X
X
X
L
X
H
L
L
H
H
L
X
X
X
X
X
X
H
X
L
H
L
H
H
H
X
X
X
X
X
X
X
L
H
L
L
H
H
H
X
X
X
X
X
X
X
H
L
H
[1] H = HIGH voltage level; L = LOW voltage level; X = don’t care; Z = high-impedance OFF-state.
7. Limiting values
Table 4. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to GND (ground = 0 V).
Symbol
Parameter
Conditions
Min Max Unit
VCC
supply voltage
IIK
input clamping current
VI < 0.5 V or VI > VCC + 0.5 V
IOK
output clamping current VO < 0.5 V or VO > VCC + 0.5 V
IO
output current
VO = 0.5 V to (VCC + 0.5 V)
0.5
+7 V
-
20 mA
-
20 mA
-
25 mA
ICC
IGND
Tstg
Ptot
supply current
ground current
storage temperature
total power dissipation
Tamb = 40 C to +125 C
SO16 package
-
+50 mA
50
- mA
65 +150 C
[1]
-
500 mW
(T)SSOP16 package
[2]
-
500 mW
[1] For SO16 package: Ptot derates linearly with 8 mW/K above 70 C.
[2] For SSOP16 and TSSOP16 packages: Ptot derates linearly with 5.5 mW/K above 60 C.
74HC_HCT251
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 4 — 1 February 2016
.
4 of 18
© Nexperia B.V. 2017. All rights reserved
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