Extended AC Electrical Characteristics
(SOIC package)
74ABT
T
A
e b
40 C to
a
85 C
V
CC
e
4 5V to 5 5V
C
L
e
50 pF
8 Outputs Switching
(Note 4)
Min
t
PLH
t
PHL
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PZL
Propagation Delay
D
n
to O
n
Propagation Delay
LE to O
n
Output Enable Time
Output Disable Time
15
15
15
15
15
15
10
10
Max
52
52
55
55
62
62
55
55
74ABT
T
A
e b
40 C to
a
85 C
V
CC
e
4 5V to 5 5V
C
L
e
250 pF
(Note 5)
Min
20
20
20
20
20
20
(Note 7)
Max
68
68
75
75
80
80
74ABT
T
A
e b
40 C to
a
85 C
V
CC
e
4 5V to 5 5V
C
L
e
250 pF
8 Outputs Switching
(Note 6)
Min
20
20
20
20
20
20
(Note 7)
Max
90
90
95
95
10 5
10 5
ns
ns
ns
ns
Symbol
Parameter
Units
Note 4
This specification is guaranteed but not tested The limits apply to propagation delays for all paths described switching in phase (i e all LOW-to-HIGH
HIGH-to-LOW etc )
Note 5
This specification is guaranteed but not tested The limits represent propagation delay with 250 pF load capacitors in plce of the 50 pF load capacitors in
the standard AC load This specificaiton pertains to single output switching only
Note 6
This specification is guaranteed but not tested The limits represent propagation delays for all paths described switching in phase (i e all LOW-to-HIGH
HIGH-to-LOW etc ) with 250 pF load capacitors in place of the 50 pF load capacitors in the standard AC load
Note 7
The TRI-STATE delay times are dominated by the RC network (500X 250 pF) on the output and has been excluded from the datasheet
Skew
74ABT
T
A
e b
40 C to
a
85 C
V
CC
e
4 5V–5 5V
C
L
e
50 pF
8 Outputs Switching
(Note 3)
Max
t
OSHL
(Note 1)
t
OSLH
(Note 1)
t
PS
(Note 5)
t
OST
(Note 1)
t
PV
(Note 2)
Pin to Pin Skew
HL Transitions
Pin to Pin Skew
LH Transitions
Duty Cycle
LH–HL Skew
Pin to Pin Skew
LH HL Transitions
Device to Device Skew
LH HL Transitions
10
10
14
15
20
74ABT
T
A
e b
40 C to
a
85 C
V
CC
e
4 5V–5 5V
C
L
e
250 pF
8 Outputs Switching
(Note 4)
Max
15
15
35
39
40
ns
ns
ns
ns
ns
Symbol
Parameter
Units
Note 1
Skew is defined as the absolute value of the difference between the actual propagation delays for any two separate outputs of the same device The
specification applies to any outputs switching HIGH to LOW (t
OSHL
) LOW to HIGH (t
OSLH
) or any combination switching LOW to HIGH and or HIGH to LOW
(t
OST
) This specification is guaranteed but not tested
Note 2
Propagation delay variation for a given set of conditions (i e temperature and V
CC
) from device to device This specification is guaranteed but not tested
Note 3
This specification is guaranteed but not tested The limits apply to propagation delays for all paths described switching in phase (i e all LOW-to-HIGH
HIGH-to-LOW etc )
Note 4
This specification is guaranteed but not tested The limits represent propagation delays with 250 pF load capacitors in place of the 50 pF load capacitors in
the standard AC load
Note 5
This describes the difference between the delay of the LOW-to-HIGH and the HIGH-to-LOW transition on the same pin It is measured across all the
outputs (drivers) on the same chip the worst (largest delta) number is the guaranteed specification This specification is guaranteed but not tested
5
NSC [ NATIONAL SEMICONDUCTOR ]
