Datasheet
SN54ABT657A, SN74ABT657A
OCTAL TRANSCEIVERS WITH PARITY GENERATORS/CHECKERS
AND 3-STATE OUTPUTS
SCBS192E – JANUARY 1991 – REVISED JUNE 1997
7
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature, C
L
= 50 pF (unless otherwise noted) (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
V
CC
= 5 V,
T
A
= 25°C
SN54ABT657A SN74ABT657A
UNIT
(INPUT)
(OUTPUT)
MIN TYP MAX MIN MAX MIN MAX
t
PLH
AorB
BorA
1 3.2 4.2 1 5 1 4.6
ns
t
PHL
A
or
B
B
or
A
1 2.8 3.8 1 4.5 1 4.3
ns
t
PLH
A
PARITY
1.8 4.8 6.3 1.8 8.5 1.8 8.1
ns
t
PHL
A
PARITY
2.3 4.9 6.4 2.3 8.1 2.3 7.7
ns
t
PLH
ODD/EVEN
PARITY ERR
1.1 3.3 4.2 1.1 5.3 1.1 4.9
ns
t
PHL
ODD/EVEN
PARITY
,
ERR
1.3 3.4 4.5 1.3 5.1 1.3 4.9
ns
t
PLH
B
ERR
1.6 4.7 6.5 1.6 8.4 1.6 7.9
ns
t
PHL
B
ERR
2.1 4.9 6.9 2.1 8 2.1 7.8
ns
t
PLH
PARITY
ERR
2 4.8 6.3 2 8.1 2 7.7
ns
t
PHL
PARITY
ERR
2.1 4.9 6.7 2.1 8 2.1 7.5
ns
t
PZH
OE
A B PARITY
1.4 4 5.4 1.4 6.8 1.4 6.5
ns
t
PZL
OE
A
,
B
,
PARITY
1.7 4.1 5.8 1.7 6.7 1.7 6.5
ns
t
PZH
OE
ERR
1.8 4.1 5.4 1.8 6.9 1.8 6.6
ns
t
PZL
OE
ERR
3.3 6.2 7.6 3.3 9.7 3.3 9.2
ns
t
PHZ
OE
A, B, PARITY, or
2.4 4.2 5.6 2.4 6.3 2.4 6.2
ns
t
PLZ
OE
,, ,
ERR
1.8 4.2 6.2 1.8 8.9 1.8 7.8
ns
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