Philips Semiconductors
Product specification
8-input multiplexer; 3-state
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
74HC
SYMBOL PARAMETER
UNIT
WAVEFORMS
VCC
(V)
+25
−40 to +85 −40 to +125
min. typ. max. min. max. min. max.
tPHL/ tPLH propagation delay
In to Y
50
18
14
170
34
29
215
43
37
255
51
43
ns
ns
ns
ns
ns
ns
ns
2.0 Fig.6
4.5
6.0
t
t
t
t
PHL/ tPLH propagation delay
In to Y
55
20
16
175
35
30
220
44
37
265
53
45
2.0 Fig.7
4.5
6.0
PHL/ tPLH propagation delay
Sn to Y
66
24
19
205
41
35
255
51
43
310
62
53
2.0 Fig.6
4.5
6.0
PHL/ tPLH propagation delay
Sn to Y
69
25
20
205
41
35
255
51
43
310
62
53
2.0 Fig.7
4.5
6.0
PZH/ tPZL 3-state output enable time
OE to Y, Y
36
13
10
140
28
24
175
35
30
210
42
36
2.0 Fig.7
4.5
6.0
tPHZ/ tPLZ 3-state output disable time
OE to Y, Y
39
14
11
140
28
24
170
35
30
210
42
36
2.0 Fig.7
4.5
6.0
t
THL/ tTLH output transition time
19
7
6
75
15
13
95
19
16
110
22
19
2.0 Figs 6 and 7
4.5
6.0
December 1990
5
NXP [ NXP ]
