Datasheet
SN54LVTH18646A, SN54LVTH182646A, SN74LVTH18646A, SN74LVTH182646A
3.3-V ABT SCAN TEST DEVICES
WITH 18-BIT TRANSCEIVERS AND REGISTERS
SCBS311D – MARCH 1994 – REVISED JUNE 1997
30
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
switching characteristics over recommended operating free-air temperature range (unless
otherwise noted) (normal mode) (see Figure 15)
SN54LVTH18646A SN74LVTH18646A
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
V
CC
= 3.3 V
± 0.3 V
V
CC
= 2.7 V
V
CC
= 3.3 V
± 0.3 V
V
CC
= 2.7 V
UNIT
MIN MAX MIN MAX MIN MAX MIN MAX
f
max
CLKAB or CLKBA 120 100 120 100 MHz
t
PLH
AorB
BorA
1.5 5 5.4 1.5 4.7 5.2
ns
t
PHL
A
or
B
B
or
A
1.5 5 5.4 1.5 4.7 5.2
ns
t
PLH
CLKAB or CLKBA
BorA
1.5 6.9 7.5 1.5 6.5 7.1
ns
t
PHL
CLKAB
or
CLKBA
B
or
A
1.5 6.9 7.5 1.5 6.5 7.1
ns
t
PLH
SAB or SBA
BorA
1.5 7.9 8.7 1.5 7.5 8.4
ns
t
PHL
SAB
or
SBA
B
or
A
1.5 7.9 8.7 1.5 7.5 8.4
ns
t
PZH
DIR
BorA
1.5 8.2 9.2 1.5 7.8 8.6
ns
t
PZL
DIR
B
or
A
1.5 8.2 9.2 1.5 7.8 8.6
ns
t
PZH
OE
BorA
1.5 8.6 9.5 1.5 8.1 9
ns
t
PZL
OE
B
or
A
1.5 8.6 9.5 1.5 8.1 9
ns
t
PHZ
DIR
BorA
2.5 10.5 11.3 2.5 9.7 10.6
ns
t
PLZ
DIR
B
or
A
2.5 9 10.1 2.5 8.6 9.3
ns
t
PHZ
OE
BorA
3 11.1 11.9 3 10.4 11.1
ns
t
PLZ
OE
B
or
A
3 9.8 10.5 3 9.1 9.7
ns
switching characteristics over recommended operating free-air temperature range (unless
otherwise noted) (test mode) (see Figure 15)
SN54LVTH18646A SN74LVTH18646A
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
V
CC
= 3.3 V
± 0.3 V
V
CC
= 2.7 V
V
CC
= 3.3 V
± 0.3 V
V
CC
= 2.7 V
UNIT
MIN MAX MIN MAX MIN MAX MIN MAX
f
max
TCK 50 40 50 40 MHz
t
PLH
TCK↓
AorB
2.5 15 18 2.5 14 17
ns
t
PHL
TCK↓
A
or
B
2.5 15 18 2.5 14 17
ns
t
PLH
TCK↓
TDO
1 6 7 1 5.5 6.5
ns
t
PHL
TCK↓
TDO
1.5 7 8 1.5 6.5 7.5
ns
t
PZH
TCK↓
AorB
4 18 21 4 17 20
ns
t
PZL
TCK↓
A
or
B
4 18 21 4 17 20
ns
t
PZH
TCK↓
TDO
1 6 7 1 5.5 6.5
ns
t
PZL
TCK↓
TDO
1.5 6 7 1.5 5.5 6.5
ns
t
PHZ
TCK↓
AorB
4 19 21 4 18 20
ns
t
PLZ
TCK↓
A
or
B
4 18 19.5 4 17 18.5
ns
t
PHZ
TCK↓
TDO
1.5 7.5 9 1.5 7 8.5
ns
t
PLZ
TCK↓
TDO
1.5 7.5 8.5 1.5 7 8
ns
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change or discontinue these products without notice.