Datasheet

SN54ABT8245, SN74ABT8245
SCAN TEST DEVICES
WITH OCTAL BUS TRANSCEIVERS
SCBS124D – AUGUST 1992 – REVISED DECEMBER 1996
21
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
timing requirements over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (test mode) (see Figure 13)
SN54ABT8245 SN74ABT8245
UNIT
MIN MAX MIN MAX
UNIT
f
clock
Clock frequency TCK 0 50 0 50 MHz
t
w
Pulse duration TCK high or low 5 5 ns
A or B or DIR or OE before TCK↑ 7 5
t
su
Setup time
TDI before TCK↑
6 6
ns
TMS before TCK↑ 6 6
A or B or DIR or OE after TCK↑ 0 0
t
h
Hold time
TDI after TCK↑
0 0
ns
TMS after TCK↑ 0 0
t
d
Delay time Power up to TCK↑ 50* 50 ns
t
r
Rise time V
CC
power up 1* 1 µs
* On products compliant to MIL-PRF-38535, this parameter is not production tested.
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (normal mode) (see Figure 13)
SN54ABT8245
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
V
CC
= 5 V,
T
A
= 25°C
MIN MAX
UNIT
MIN TYP MAX
t
PLH
AorB
BorA
2 3.5 4.6 2 5.8
ns
t
PHL
A
or
B
B
or
A
2 3.4 4.5 2 5.5
ns
t
PZH
OE
BorA
2.5 4.5 5.8 2.5 6.9
ns
t
PZL
OE
B
or
A
3 5.2 6.6 3 8.1
ns
t
PHZ
OE
BorA
3 6.1 7.6 3 8.9
ns
t
PLZ
OE
B
or
A
3 5.5 6.9 3 8
ns
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (normal mode) (see Figure 13)
SN74ABT8245
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
V
CC
= 5 V,
T
A
= 25°C
MIN MAX
UNIT
MIN TYP MAX
t
PLH
AorB
BorA
2 3.5 4.3 2 4.8
ns
t
PHL
A
or
B
B
or
A
2 3.4 4.2 2 5.1
ns
t
PZH
OE
BorA
2.5 4.5 5.5 2.5 6.8
ns
t
PZL
OE
B
or
A
3 5.2 6 3 7.5
ns
t
PHZ
OE
BorA
3 6.1 7.1 3 8.4
ns
t
PLZ
OE
B
or
A
3 5.5 6.6 3 7.5
ns