Datasheet

SN54ABT8245, SN74ABT8245
SCAN TEST DEVICES
WITH OCTAL BUS TRANSCEIVERS
SCBS124D – AUGUST 1992 – REVISED DECEMBER 1996
22
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (test mode) (see Figure 13)
SN54ABT8245
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
V
CC
= 5 V,
T
A
= 25°C
MIN MAX
UNIT
MIN TYP MAX
f
max
TCK 50 90 50 MHz
t
PLH
TCK↓
AorB
3.5 8 9.5 3.5 12.5
ns
t
PHL
TCK↓
A
or
B
3 7.7 9 3 12
ns
t
PLH
TCK↓
TDO
2.5 4.3 5.5 2.5 7
ns
t
PHL
TCK↓
TDO
2.5 4.2 5.5 2.5 7
ns
t
PZH
TCK↓
AorB
4.5 8.2 9.8 4.5 12.5
ns
t
PZL
TCK↓
A
or
B
4.5 9 10.5 4.5 13.5
ns
t
PZH
TCK↓
TDO
2.5 4.3 5.5 2.5 7
ns
t
PZL
TCK↓
TDO
2.5 4.9 6.3 2.5 7.8
ns
t
PHZ
TCK↓
AorB
3.5 8.4 11.2 3.5 14.2
ns
t
PLZ
TCK↓
A
or
B
3 8 10.5 3 13.5
ns
t
PHZ
TCK↓
TDO
2 5.9 7 2 9
ns
t
PLZ
TCK↓
TDO
3 5 6.5 3 8
ns
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (test mode) (see Figure 13)
FROM TO
SN74ABT8245
PARAMETER
FROM
(INPUT)
FROM
TO
(OUTPUT)
TO
V
CC
= 5 V,
T
A
= 25°C
MIN MAX
UNIT
(INPUT) (OUTPUT)
MIN TYP MAX
f
max
TCK 50 90 50 MHz
t
PLH
TCK↓
AorB
3.5 8 9.5 3.5 12
ns
t
PHL
TCK↓
A
or
B
3 7.7 9 3 11.5
ns
t
PLH
TCK↓
TDO
2.5 4.3 5.5 2.5 6.5
ns
t
PHL
TCK↓
TDO
2.5 4.2 5.5 2.5 6.5
ns
t
PZH
TCK↓
AorB
4.5 8.2 9.5 4.5 12
ns
t
PZL
TCK↓
A
or
B
4.5 9 10.5 4.5 13
ns
t
PZH
TCK↓
TDO
2.5 4.3 5.5 2.5 6.5
ns
t
PZL
TCK↓
TDO
2.5 4.9 6 2.5 7
ns
t
PHZ
TCK↓
AorB
3.5 8.4 10.5 3.5 13.5
ns
t
PLZ
TCK↓
A
or
B
3 8 10.5 3 13
ns
t
PHZ
TCK↓
TDO
3 5.9 7 3 8.5
ns
t
PLZ
TCK↓
TDO
3 5 6.5 3 7.5
ns