SN54ABT18245A_06 Datasheet, PDF (26/32 Pages) Texas Instruments – SCAN TEST DEVICES WITH 18-BIT BUS TRANSCEIVERS

SN54ABT18245A, SN74ABT18245A
SCAN TEST DEVICES
WITH 18-BIT BUS TRANSCEIVERS
SCBS110H – AUGUST 1992 – REVISED FEBRUARY 1999
timing requirements over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (test mode) (see Figure 14)
fclock Clock frequency
TCK
tw
Pulse duration
TCK high or low
A, B, DIR, or OE before TCK↑
tsu
Setup time
TDI before TCK↑
TMS before TCK↑
A, B, DIR, or OE after TCK↑
th
Hold time
TDI after TCK↑
TMS after TCK↑
td
Delay time
Power up to TCK↑
tr
Rise time
VCC power up
* On products compliant to MIL-PRF-38535, these parameters are not production tested.
SN54ABT18245A SN74ABT18245A
MIN MAX MIN MAX
0
50
0
50
8.1
8.1
9.5
7
4.5
4.5
3.6
3.6
0.7
0
0
0
0.5
0.5
50*
50
1*
1
UNIT
MHz
ns
ns
ns
ns
µs
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (normal mode) (see Figure 14)
PARAMETER
tPLH
tPHL
tPZH
tPZL
tPHZ
tPLZ
FROM
(INPUT)
A or B
OE
OE
TO
(OUTPUT)
B or A
B or A
B or A
VCC = 5 V,
TA = 25°C
SN54ABT18245A SN74ABT18245A
MIN TYP MAX MIN MAX MIN MAX
1.5 2.8 4.1 1.5
5.1
1.5
4.8
1.5 3.1 4.6 1.5
5.8
1.5
5.4
2 4.7 5.8
2
8.1
2
7.5
2 4.5 6.2
2
8.5
2
8
2.5 5.8 6.8 2.5
9.5
2.5
8.5
2.5 4.8
6 2.5
8.5
2.5
7.5
UNIT
ns
ns
ns
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (test mode) (see Figure 14)
PARAMETER
fmax
tPLH
tPHL
tPLH
tPHL
tPZH
tPZL
tPZH
tPZL
tPHZ
tPLZ
tPHZ
tPLZ
FROM
(INPUT)
TCK↓
TCK↓
TCK↓
TCK↓
TCK↓
TCK↓
TCK↓
TO
(OUTPUT)
A or B
TDO
A or B
TDO
A or B
TDO
VCC = 5 V,
TA = 25°C
SN54ABT18245A SN74ABT18245A
MIN TYP MAX MIN MAX MIN MAX
50
90
50
50
3 7.1 10.1 2.8
14
3
13.1
3
7 10.1
3
13.8
3
12.8
2 3.4
5
2
6.4
2
6.1
2 3.9 5.6
2
7
2
6.5
4 7.5 10.6
4
14.1
4
13.4
4 7.6 10.5
4
14.3
4
13.6
2 3.8 5.5
2
7
2
6.6
2.5
4 5.7 2.3
7.3
2.5
6.9
3.5 7.7 10.8 2.9
14.4
3.5
13.6
2.5 7.1 10.1 2.5
13.8
2.5
12.7
2 3.9 5.7
2
7.5
2
7.2
1.5 3.5 5.4 1.5
6.7
1.5
6.3
UNIT
MHz
ns
ns
ns
ns
ns
ns
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