SN54ABT8996_15 Datasheet, PDF (37/46 Pages) Texas Instruments – 10-BIT ADDRESSABLE SCAN PORTS MULTIDROP-ADDRESSABLE IEEE STD 1149.1 (JTAG) TAP TRANSCEIVERS

SN54ABT8996, SN74ABT8996
10-BIT ADDRESSABLE SCAN PORTS
MULTIDROP-ADDRESSABLE IEEE STD 1149.1 (JTAG) TAP TRANSCEIVERS
SCBS489C – AUGUST 1994 – REVISED APRIL 1999
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (see Figure 24)
SN74ABT8996
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC = 5 V,
TA = 25°C
MIN TYP MAX
UNIT
MIN MAX
fmax
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
PTCK
BYP↑
BYP↓
BYP↓
PTCK
PTCK↓
CON
STMS
STCK
CON
40
40
MHz
1
3 4.2
1 3.8 5.2
1 4.8
ns
1
6
2.5 7.8
2.5 5.2
10 2.5 12.2
ns
7 2.5 8.4
1 2.2 3.1
1 2.8 3.9
1 3.4
ns
1 4.5
3.5 6.9 8.9 3.5 10.6
ns
3.5
7 9.3 3.5 10.8
tPLH
tPHL
tPLH†
tPHL†
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
PTCK↓
(shadow-protocol
acknowledge)
PTCK↓
(connect)
PTDI
PTMS
PTRST
PTRST↓
PTDO
STMS
STDO
STMS
STRST
CON
STMS
3 7.6 9.9
3 6.2 9.4
3 11.8
ns
3 10.2
5.5 12.1 15.4 5.5 18.6
ns
5.5 9.7 12.5 5.5 14.9
1 3.1 4.4
1 3.3 4.5
1
5
ns
1 5.3
1 3.2 4.4
1 3.4 4.7
1 5.1
ns
1 5.5
1 3.2 4.8
1 3.3 4.7
1 5.7
ns
1 5.7
3.5 7.4 9.5 3.5 11.4
ns
2.5 5.6 7.7 2.5 9.2
tPLH
tPHL
STDI
PTDO
1 2.8
4
1 3.3 4.6
1 4.5
ns
1 5.4
† _{The transitions at STMS are possible only when a shadow-protocol select is issued while STMS is held (in the OFF status) at a level that differs}
from that at PTMS. Such operation is not recommended since state synchronization of the primary TAP to secondary TAP cannot be ensured.
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
37