Datasheet

www.fairchildsemi.com 4
MM74HC240
AC Electrical Characteristics
V
CC
5V, T
A
25 C, t
r
t
f
6 ns
AC Electrical Characteristics
V
CC
2.0V to 6.0V, 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 Limit Units
t
PHL
, t
PLH
Maximum Propagation Delay C
L
45 pF 12 18 ns
t
PZH
, t
PZL
Maximum Enable Delay R
L
1 k
14 28 ns
to Active Output C
L
45 pF
t
PHZ
, t
PLZ
Maximum Disable Delay R
L
1 k
13 25 ns
from Active Output C
L
5 pF
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 C
L
50 pF 2.0V 55 100 126 149 ns
Delay C
L
150 pF 2.0V 80 150 190 224 ns
C
L
50 pF 4.5V 12 20 25 30 ns
C
L
150 pF 4.5V 22 30 38 45 ns
C
L
50 pF 6.0V 11 17 21 25 ns
C
L
150 pF 6.0V 28 26 32 38 ns
t
PZH
, t
PZL
Maximum Output Enable R
L
1 k
TIme C
L
50 pF 2.0V 75 150 189 224 ns
C
L
150 pF 2.0V 100 200 252 298 ns
C
L
50 pF 4.5V 15 30 38 45 ns
C
L
150 pF 4.5V 20 40 50 60 ns
C
L
50 pF 6.0V 13 26 32 38 ns
C
L
150 pF 6.0V 17 34 43 51 ns
t
PHZ
, t
PLZ
Maximum Output Disable R
L
1 k 2.0V 75 150 189 224 ns
Time C
L
50 pF 4.5V 15 30 38 45 ns
6.0V 13 26 32 38 ns
t
TLH
, t
THL
Maximum Output 2.0V 60 75 90 ns
Rise and Fall Time 4.5V 12 15 18 ns
6.0V 10 13 15 ns
C
PD
Power Dissipation (per buffer)
Capacitance (Note 5) G V
IH
12 pF
G
V
IL
50 pF
C
IN
Maximum Input Capacitance 5 10 10 10 pF
C
OUT
Maximum Output Capacitance 10 20 20 20 pF