www.fairchildsemi.com 4
MM74HC157
AC Electrical Characteristics
V
CC
= 5V, T
A
= 25°C, C
L
= 15 pF, t
r
= t
f
= 6 ns
AC Electrical Characteristics
C
L
= 50 pF, t
r
= t
f
= 6 ns (unless otherwise specified)
Note 5: C
PD
determines the no load dynamic power consumption, P
D
= C
PD
V
CC
2
f + I
CC
V
CC
, and the no load dynamic current consumption,
I
S
= C
PD
V
CC
f + I
CC
.
Symbol Parameter Conditions Typ
Guaranteed
Units
Limit
t
PHL
, t
PLH
Maximum Propagation 14 20 ns
Delay, Data to Output
t
PHL
, t
PLH
Maximum Propagation 14 20 ns
Delay, Select to Output
t
PHL
, t
PLH
Maximum Propagation 12 18 ns
Delay, Strobe to Output
Symbol Parameter Conditions
V
CC
T
A
= 25°CT
A
= −40 to 85°CT
A
= −55 to 125°C
Units
Typ Guaranteed Limits
t
PHL
, t
PLH
Maximum Propagation 2.0V 63 125 158 186 ns
Delay, Data to Output 4.5V 13 25 32 37 ns
6.0V 11 21 27 32 ns
t
PHL
, t
PLH
Maximum Propagation 2.0V 63 125 158 186 ns
Delay, Select to Output 4.5V 13 25 32 37 ns
6.0V 11 21 27 32 ns
t
PHL
, t
PLH
Maximum Propagation 2.0V 58 115 145 171 ns
Delay, Strobe to Output 4.5V 12 23 29 34 ns
6.0V 10 20 25 29 ns
t
TLH
, t
THL
Maximum Output Rise 2.0V 30 75 95 110 ns
and Fall Time 4.5V 8 15 19 22 ns
6.0V 7 13 16 19 ns
C
IN
Maximum Input 5 10 10 10 pF
Capacitance
C
PD
Power Dissipation (per 57 pF
Capacitance (Note 5) Multiplexer)
