74ABT245
Skew
(SOIC package)
T
A
= −40°C
to
+85°C
V
CC
=
4.5V–5.5V
Symbol
Parameter
C
L
=
50 pF
8 Outputs Switching
(Note 12)
Max
t
OSHL
(Note 10)
t
OSLH
(Note 10)
t
PS
(Note 14)
t
OST
(Note 10)
t
PV
(Note 11)
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
1.3
1.0
2.0
2.0
2.0
T
A
= −40°C
to
+85°C
V
CC
=
4.5V–5.5V
C
L
=
250 pF
8 Outputs Switching
(Note 13)
Max
2.3
1.8
3.5
3.5
3.5
ns
ns
ns
ns
ns
Units
Note 10:
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
). The specification is guaranteed but not tested.
Note 11:
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 12:
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 13:
These specifications 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 14:
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.
Capacitance
Conditions
Symbol
C
IN
C
I/O
(Note 15)
Parameter
Input Capacitance
I/O Capacitance
Typ
5.0
11.0
Units
pF
pF
T
A
=
25°C
V
CC
=
0V (OE, T/R)
V
CC
=
5.0V (A
n
, B
n
)
Note 15:
C
I/O
is measured at frequency f
=
1 MHz, per MIL-STD-883, Method 3012.
5
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