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CD74HC251 Datasheet(PDF) 5 Page - Texas Instruments

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Part No. CD74HC251
Description  High Speed CMOS Logic 8-Input Multiplexer; Three-State
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

CD74HC251 Datasheet(HTML) 5 Page - Texas Instruments

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


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