www.fairchildsemi.com 4
MM74HC151
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 Delay 26 35 ns
A, B or C to Y
t
PHL
, t
PLH
Maximum Propagation Delay 27 35 ns
A, B or C to W
t
PHL
, t
PLH
Maximum Propagation Delay 22 29 ns
Any D to Y
t
PHL
, t
PLH
Maximum Propagation Delay 24 32 ns
any D to W
t
PHL
, t
PLH
Maximum Propagation Delay 17 23 ns
Strobe to Y
t
PHL
, t
PLH
Maximum Propagation Delay 16 21 ns
Strobe to W
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 Delay 2.0V 90 205 256 300 ns
A, B or C to Y 4.5V 31 41 51 60 ns
6.0V 26 35 44 51 ns
t
PHL
, t
PLH
Maximum Propagation Delay 2.0V 95 205 256 300 ns
A, B or C to W 4.5V 32 41 51 60 ns
6.0V 27 35 44 51 ns
t
PHL
, t
PLH
Maximum Propagation Delay 2.0V 70 195 244 283 ns
any D to Y 4.5V 27 39 49 57 ns
6.0V 23 33 41 48 ns
t
PHL
, t
PLH
Maximum Propagation Delay 2.0V 75 185 231 268 ns
any D to W 4.5V 29 37 46 54 ns
6.0V 25 32 40 46 ns
t
PHL
, t
PLH
Maximum Propagation Delay 2.0V 50 140 175 203 ns
Strobe to Y 4.5V 21 28 35 41 ns
6.0V 18 24 30 35 ns
t
PHL
, t
PLH
Maximum Propagation Delay 2.0V 45 127 159 185 ns
Strobe to W 4.5V 20 25 32 37 ns
6.0V 17 22 28 32 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
PD
Power Dissipation (per package) 110 pF
Capacitance (Note 5)
C
IN
Maximum Input 5 10 10 10 pF
Capacitance
