Datasheet

SN54LVT8996, SN74LVT8996
3.3-V 10-BIT ADDRESSABLE SCAN PORTS
MULTIDROP-ADDRESSABLE IEEE STD 1149.1 (JTAG) TAP TRANSCEIVERS
SCBS686A – APRIL 1997 – REVISED DECEMBER 1999
38
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (see Figure 24)
SN74LVT8996
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
V
CC
= 3.3 V
± 0.3 V
V
CC
= 2.7 V
UNIT
MIN MAX MIN MAX
f
max
PTCK 25 20 MHz
t
PLH
BYP↑
CON
1 8.2 1 9.4
ns
t
PHL
BYP↓
CON
1 9.8 1 11.4
ns
t
PLH
BYP↓
STMS
2.5 12 2.5 14.7
ns
t
PHL
BYP↓
STMS
2.5 11.7 2.5 13.4
ns
t
PLH
PTCK
STCK
1 9.6 1 11.2
ns
t
PHL
PTCK
STCK
1 10 1 11.8
ns
t
PLH
PTCK↓
CON
3.5 20.6 3.5 24.8
ns
t
PHL
PTCK↓
CON
3.5 23 3.5 27.4
ns
t
PLH
PTCK
↓
PTDO
3 14.7 3 17.4
ns
t
PHL
(shadow-protocol acknowledge)
PTDO
3 15 3 17.7
ns
t
PLH
†
PTCK
↓
STMS
5.5 19.9 5.5 23.9
ns
t
PHL
†
(connect)
STMS
5.5 19.1 5.5 22.9
ns
t
PLH
PTDI
STDO
1 8.3 1 9.9
ns
t
PHL
PTDI
STDO
1 8.6 1 10.2
ns
t
PLH
PTMS
STMS
1 8.5 1 9.8
ns
t
PHL
PTMS
STMS
1 8.8 1 10.3
ns
t
PLH
PTRST
STRST
1 8.4 1 10
ns
t
PHL
PTRST
STRST
1 9 1 10.5
ns
t
PLH
PTRST↓
CON 3.5 23.9 3.5 29
ns
t
PLH
PTRST↓
STMS 2.5 13.2 2.5 15.7
ns
t
PLH
STDI
PTDO
1 6.8 1 8.2
ns
t
PHL
STDI
PTDO
1 7.6 1 9
ns
†
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.