Datasheet

www.fairchildsemi.com 4
MM74HC245A
AC Electrical Characteristics
V
CC
5V, T
A
25 C, t
r
t
f
6ns
AC Electrical Characteristics
V
CC
2.0V to 6.0V, C
L
50 pF, t
r
t
f
6ns (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 C
L
45 pF 12 17 ns
t
PZH
, t
PZL
Maximum Output Enable R
L
1 k 24 35 ns
Time C
L
45 pF
t
PHZ
, t
PLZ
Maximum Output Disable R
L
1 k 18 25 ns
Time 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
, Maximum Propagation C
L
50 pF 2.0V 31 90 113 135 ns
t
PLH
Delay C
L
150 pF 2.0V 41 96 116 128 ns
C
L
50 pF 4.5V 13 18 23 27 ns
C
L
150 pF 4.5V 17 22 28 33 ns
C
L
50 pF 6.0V 11 15 19 23 ns
C
L
150 pF 6.0V 14 19 23 28 ns
t
PZH
, Maximum Output Enable R
L
1 k
t
PZL
Time C
L
50 pF 2.0V 71 190 240 285 ns
C
L
150 pF 2.0V 81 240 300 360 ns
C
L
50 pF 4.5V 26 38 48 57 ns
C
L
150 pF 4.5V 31 48 60 72 ns
C
L
50 pF 6.0V 21 32 41 48 ns
C
L
150 pF 6.0V 25 41 51 61 ns
t
PHZ
, Maximum Output Disable R
L
1 k 2.0V 39 135 169 203 ns
t
PLZ
Time C
L
50 pF 4.5V 20 27 34 41 ns
6.0V 18 23 29 34 ns
t
TLH
, t
THL
Output Rise and Fall Time C
L
50 pF 2.0V 20 60 75 90 ns
4.5V 6 12 15 18 ns
6.0V 5 10 13 15 ns
C
PD
Power Dissipation G V
IL
50 pF
Capacitance (Note 5) G
V
IH
5pF
C
IN
Maximum Input Capacitance 5 10 10 10 pF
C
IN/OUT
Maximum Input/Output 15 20 20 20 pF
Capacitance, A or B