74HC251 Datasheet, PDF (5/7 Pages) NXP Semiconductors – 8-input multiplexer; 3-state

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
I_CC category: MSI
AC CHARACTERISTICS FOR 74HC
GND = 0 V; t_r = t_f = 6 ns; C_L = 50 pF
T_amb (°C)
TEST CONDITIONS
SYMBOL PARAMETER
74HC
+25
−40 to +85
−40 to +125
UNIT
V_CC
(V)
WAVEFORMS
min. typ. max. min. max. min. max.
t_PHL/ t_PLH propagation delay
I_n to Y
t_PHL/ t_PLH propagation delay
I_n 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
t_PHL/ t_PLH propagation delay
S_n to Y
66 205
255
24 41
51
19 35
43
310 ns
62
53
2.0 Fig.6
4.5
6.0
t_PHL/ t_PLH propagation delay
S_n to Y
69 205
255
25 41
51
20 35
43
t_PZH/ t_PZL 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
t_PHZ/ t_PLZ 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
t_THL/ t_TLH 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
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