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CD74HC251 Datasheet, PDF (5/7 Pages) Texas Instruments – High Speed CMOS Logic 8-Input Multiplexer; Three-State
◁
CD74HC251, CD74HCT251
Switching Specifications Input tr, tf = 6ns
PARAMETER
HC TYPES
Propagation Delay
Select to Outputs
TEST
SYMBOL CONDITIONS VCC (V) MIN
tPLH, tPHL CL = 50pF
2
-
4.5
-
25oC
TYP MAX
-
245
-
49
-40oC TO
85oC
MIN MAX
-
305
-
61
Data to Outputs
CL =15pF
CL = 50pF
tPLH, tPHL CL = 50pF
5
-
21
-
-
-
6
-
-
42
-
52
2
-
-
175
-
220
4.5
-
-
35
-
44
CL =15pF
CL = 50pF
Enable to High Z and Enable tPLH, tPHL CL = 50pF
from High Z
5
-
12
-
-
-
6
-
-
30
-
37
2
-
-
140
-
175
4.5
-
-
28
-
35
Output Transition Time
CL =15pF
CL = 50pF
tTLH, tTHL CL = 50pF
5
-
11
-
-
-
6
-
-
24
-
30
2
-
-
75
-
95
4.5
-
-
15
-
19
6
-
-
13
-
16
Input Capacitance
Three-State Output
Capacitance
CIN
-
CO
-
-
-
-
10
-
10
-
-
-
15
-
15
Power Dissipation Capacitance
CPD
-
(Notes 4, 5)
5
-
60
-
-
-
HCT TYPES
Propagation Delay
Select to Outputs
tPLH, tPHL
CL = 50pF
CL =15pF
Data to Outputs
tPLH, tPHL CL = 50pF
CL =15pF
Enable to High Z and Enable tPLH, tPHL CL = 50pF
from High Z
CL =15pF
Output Transition Time
tTLH, tTHL CL = 50pF
Input Capacitance
CIN
-
Power Dissipation Capacitance
CPD
-
(Notes 4, 5)
4.5
-
-
42
-
53
5
-
18
-
-
4.5
-
-
35
-
44
5
-
12
-
-
-
4.5
-
30
-
38
5
-
12
-
-
-
4.5
-
-
15
-
19
-
-
-
10
-
10
5
60
-
-
-
NOTES:
4. CPD is used to determine the dynamic power consumption, per package.
5. PD = VCC2 fi (CPD + CL) where fi = input frequency, CL = output load capacitance, VCC = supply voltage.
-55oC TO
125oC
MIN MAX UNITS
-
370 ns
-
74
ns
-
-
ns
-
63
ns
-
265 ns
-
53
ns
-
-
ns
-
45
ns
-
210 ns
-
42
ns
-
-
ns
-
36
ns
-
110 ns
-
22
ns
-
19
ns
-
10 pF
-
15 pF
-
-
pF
-
63
ns
-
-
ns
-
53
ns
-
-
ns
-
45
ns
-
-
ns
-
22
ns
-
10 pF
-
-
pF
5
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