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MM74HC148 Datasheet, PDF (5/8 Pages) Fairchild Semiconductor – 8-3 Line Priority Encoder
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AC Electrical Characteristics
Symbol
tPHL, tPLH
Parameter
Maximum Propagation Delay,
Any Input to Any Output
Conditions
Typ
Guaranteed
Limits
Units
14
ns
AC Electrical Characteristics
VCC = 2.0V to 6.0V, CL = 50 pF, tr = tf = 6 ns (unless otherwise specified)
Symbol
Parameter
Conditions
VCC
TA = 25°C
Typ
TA = −40°C to +85°C TA = −55°C to +125°C Units
Guaranteed Limits
tPHL, tPLH Inputs 0–7
to Outputs
2.0V
140
175
4.5V
14
28
35
210
ns
42
ns
A0, A1, A2
6.0V
24
30
36
ns
tPHL, tPLH Inputs 0–7
to
2.0V
140
175
4.5V
15
28
35
210
ns
42
ns
Output EO
6.0V
24
30
36
ns
tPHL, tPLH Inputs 0–7
to
2.0V
160
200
4.5V
17
32
40
240
ns
48
ns
Output GS
6.0V
27
34
41
ns
tPHL, tPLH Input EI
to Outputs
2.0V
160
200
4.5V
17
32
40
240
ns
48
ns
A0, A1, A2
6.0V
27
34
41
ns
tPHL, tPLH Input EI
to
2.0V
100
125
4.5V
12
20
25
150
ns
30
ns
Output GS
6.0V
17
21
26
ns
tPHL, tPLH Input EI
to
2.0V
100
125
4.5V
12
20
25
150
ns
30
ns
Output EO
6.0V
17
21
26
ns
tf, tr
Maximum
Output Rise
2.0V
75
95
4.5V
7
15
19
110
ns
22
ns
and Fall Time
6.0V
13
16
19
ns
Cpd
Power Dissipation
52
pF
Capacitance (Note 5)
Cin
Maximum Input
Capacitance
5
10
10
10
pF
Note 5: Cpd determines the no load dynamic power consumption, and the no load dynamic current consumption.
5
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