74ABT245 Octal Bi-Directional Transceiver with 3-STATE Outputs
Extended AC Electrical Characteristics
SOIC package.
T
A
=
–40°C to +85°C,
T
A
=
–40°C to +85°C,
T
A
=
–40°C to +85°C,
V
CC
=
4.5V to 5.5V,
V
CC
=
4.5V to 5.5V,
V
CC
=
4.5V to 5.5V,
C
L
=
50pF,
C
L
=
250pF,
C
L
=
250pF,
(6)
1 Output Switching
(7)
8 Outputs Switching
(8)
8 Outputs Switching
Symbol
Parameter
Min.
Typ.
100
1.5
1.5
1.5
1.5
1.0
1.0
5.0
5.0
6.5
6.5
6.5
5.6
1.5
1.5
2.5
2.5
(9)
Max.
Min.
Max.
Min.
Max.
Units
MHz
f
TOGGLE
Max Toggle
Frequency
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Propagation
Delay
Data to Outputs
Output Enable
Time
Output Disable
Time
6.0
6.0
7.5
7.5
2.5
2.5
2.5
2.5
(9)
8.5
8.5
9.5
11.0
ns
ns
ns
Notes:
6. 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.).
7. This specification is guaranteed but not tested. The limits represent propagation delay with 250pF load capacitors in
place of the 50pF load capacitors in the standard AC load. This specification pertains to single output switching only.
8. 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 250pF load capacitors in place of the 50pF load
capacitors in the standard AC load.
9. The 3-STATE delays are dominated by the RC network (500Ω, 250pF) on the output and have been excluded from
the datasheet.
©1991 Fairchild Semiconductor Corporation
74ABT245 Rev. 1.4
www.fairchildsemi.com
6
FAIRCHILD [ FAIRCHILD SEMICONDUCTOR ]
