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
10. Dynamic characteristics
Table 7. Dynamic characteristics
Voltages are referenced to GND (ground = 0 V); CL = 50 pF unless otherwise specified; for test circuit, see Figure 9.
Symbol Parameter Conditions
Tamb = 25 C
Tamb = 40 C
to +85 C
Tamb = 40 C Unit
to +125 C
Min Typ Max Min
Max
Min
Max
74HC251
tpd
propagation In to Y; see Figure 6
delay
VCC = 2.0 V
[1]
-
50 170 -
215
-
255 ns
VCC = 4.5 V
-
18 34
-
43
-
51 ns
VCC = 5 V; CL = 15 pF
-
15
-
-
-
-
- ns
VCC = 6.0 V
-
14 29
-
37
-
43 ns
In to Y; see Figure 6
[1]
VCC = 2.0 V
-
55 175 -
220
-
265 ns
VCC = 4.5 V
-
20 35
-
44
-
53 ns
VCC = 5 V; CL = 15 pF
-
17
-
-
-
-
- ns
VCC = 6.0 V
-
16 30
-
37
-
45 ns
Sn to Y; see Figure 7
[1]
VCC = 2.0 V
-
66 205 -
255
-
310 ns
VCC = 4.5 V
-
24 41
-
51
-
62 ns
VCC = 5 V; CL = 15 pF
-
20
-
-
-
-
- ns
VCC = 6.0 V
-
19 35
-
43
-
53 ns
Sn to Y; see Figure 7
[1]
VCC = 2.0 V
-
69 205 -
255
-
310 ns
VCC = 4.5 V
-
25 41
-
51
-
62 ns
VCC = 5 V; CL = 15 pF
-
21
-
-
-
-
- ns
VCC = 6.0 V
-
20 35
-
43
-
53 ns
ten
enable time OE to Y, Y; see Figure 7
[2]
VCC = 2.0 V
-
36 140 -
175
-
210 ns
VCC = 4.5 V
-
13 28
-
35
-
42 ns
VCC = 6.0 V
-
10 24
-
30
-
36 ns
tdis
disable time OE to Y, Y; see Figure 7
[3]
VCC = 2.0 V
-
39 140 -
170
-
210 ns
VCC = 4.5 V
-
14 28
-
35
-
42 ns
VCC = 6.0 V
-
11 24
-
30
-
36 ns
tt
transition Y, Y; see Figure 6
time
VCC = 2.0 V
[4]
-
19 75
-
95
-
110 ns
VCC = 4.5 V
-
7 15
-
19
-
22 ns
VCC = 6.0 V
-
6 13
-
16
-
19 ns
CPD
power
CL = 50 pF; f = 1 MHz;
[5] -
44 -
-
-
-
- pF
dissipation VI = GND to VCC
capacitance
74HC_HCT251
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 4 — 1 February 2016
.
7 of 18
© Nexperia B.V. 2017. All rights reserved
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