74HC251PW 查看數據表（PDF） - Philips Electronics
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74HC251PW Datasheet PDF : 7 Pages
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Philips Semiconductors
8-input multiplexer; 3-state
Product specification
74HC/HCT251
DC CHARACTERISTICS FOR 74HC
For the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: standard
ICC category: MSI
AC CHARACTERISTICS FOR 74HC
GND = 0 V; tr = tf = 6 ns; CL = 50 pF
Tamb (°C)
TEST CONDITIONS
SYMBOL PARAMETER
74HC
+25
−40 to +85
−40 to +125
UNIT
VCC
(V)
WAVEFORMS
min. typ. max. min. max. min. max.
tPHL/ tPLH propagation delay
In to Y
tPHL/ tPLH propagation delay
In to Y
50 170
215
18 34
43
14 29
37
55 175
220
20 35
44
16 30
37
255 ns
51
43
265 ns
53
45
2.0 Fig.6
4.5
6.0
2.0 Fig.7
4.5
6.0
tPHL/ tPLH propagation delay
Sn to Y
66 205
255
24 41
51
19 35
43
310 ns
62
53
2.0 Fig.6
4.5
6.0
tPHL/ tPLH propagation delay
Sn to Y
69 205
255
25 41
51
20 35
43
tPZH/ tPZL 3-state output enable time
36 140
175
OE to Y, Y
13 28
35
10 24
30
310 ns
62
53
210 ns
42
36
2.0 Fig.7
4.5
6.0
2.0 Fig.7
4.5
6.0
tPHZ/ tPLZ 3-state output disable time
39 140
170
OE to Y, Y
14 28
35
11 24
30
210 ns
42
36
2.0 Fig.7
4.5
6.0
tTHL/ tTLH output transition time
19 75
95
7 15
19
6 13
16
110 ns
22
19
2.0 Figs 6 and 7
4.5
6.0
December 1990
5
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