74HC251 데이터 시트보기 (PDF) - Philips Electronics
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74HC251 Datasheet PDF : 7 Pages
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Philips Semiconductors
8-input multiplexer; 3-state
Product specification
74HC/HCT251
DC CHARACTERISTICS FOR 74HCT
For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: standard
ICC category: MSI
Note to HCT types
The value of additional quiescent supply current (∆ICC) for a unit load of 1 is given in the family specifications.
To determine ∆ICC per input, multiply this value by the unit load coefficient shown in the table below.
INPUT
In
S0
S1, S2
OE
UNIT LOAD COEFFICIENT
1.00
1.50
1.50
1.50
AC CHARACTERISTICS FOR HCT
GND = 0 V; tr = tf = 6 ns; CL = 50 pF
SYMBOL PARAMETER
tPHL/ tPLH
tPHL/ tPLH
tPHL/ tPLH
tPHL/ tPLH
tPZH/ tPZL
tPHZ/ tPLZ
tTHL/ tTLH
propagation delay
In to Y
propagation delay
In to Y
propagation delay
Sn to Y
propagation delay
Sn to Y
3-state output enable time
OE to Y, Y
3-state output disable time
OE to Y, Y
output transition time
Tamb (°C)
TEST CONDITIONS
74HCT
+25
−40 to +85
−40 to +125
UNIT
VCC
(V)
WAVEFORMS
min. typ. max. min. max. min. max.
22 35
44
53 ns 4.5 Fig.6
22 35
44
53 ns 4.5 Fig.7
24 44
55
66 ns 4.5 Fig.6
25 44
55
66 ns 4.5 Fig.7
13 28
35
42 ns 4.5 Fig.7
14 28
35
42 ns 4.5 Fig.7
7 15
19
22 ns 4.5 Figs 6 and 7
December 1990
6
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