Datasheet
SN54ABTH18502A, SN54ABTH182502A, SN74ABTH18502A, SN74ABTH182502A
SCAN TEST DEVICES
WITH 18-BIT UNIVERSAL BUS TRANSCEIVERS
SCBS164E – AUGUST 1993 – REVISED DECEMBER 1996
34
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted) (continued)
PARAMETER
TEST CONDITIONS
T
A
= 25°C SN54ABTH182502A SN74ABTH182502A
UNIT
PARAMETER
TEST
CONDITIONS
MIN TYP
†
MAX MIN MAX MIN MAX
UNIT
C
i
Control
inputs
V
I
= 2.5 V or 0.5 V 5 pF
C
io
A or B ports V
O
= 2.5 V or 0.5 V 10 pF
C
o
TDO V
O
= 2.5 V or 0.5 V 8 pF
†
All typical values are at V
CC
= 5 V.
timing requirements over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (normal mode) (see Figure 14)12
SN54ABTH182502A SN74ABTH182502A
UNIT
MIN MAX MIN MAX
UNIT
f
clock
Clock frequency CLKAB or CLKBA 0 100 0 100 MHz
t
Pulse duration
CLKAB or CLKBA high or low 3.5 3.5
ns
t
w
P
u
lse
d
u
ration
LEAB or LEBA high 3.5 3.5
ns
A before CLKAB↑ or B before CLKBA↑ 3.5 3.5
t
su
Setup time
A before LEAB↓ or B before LEBA↓
CLK high 3.5 3.5
ns
A
b
e
f
ore
LEAB↓
or
B
b
e
f
ore
LEBA↓
CLK low 2 2
t
h
Hold time
A after CLKAB↑ or B after CLKBA↑ 0.5 0.5
ns
t
h
Hold
time
A after LEAB↓ or B after LEBA↓ 3 3
ns
timing requirements over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (test mode) (see Figure 14)
SN54ABTH182502A SN74ABTH182502A
UNIT
MIN MAX MIN MAX
UNIT
f
clock
Clock frequency TCK 0 50 0 50 MHz
t
w
Pulse duration TCK high or low 8 8 ns
A, B, CLK, LE, or OE before TCK↑ 6 6
t
su
Setup time
TDI before TCK↑
4.5 4.5
ns
TMS before TCK↑ 3 3
A, B, CLK, LE, or OE after TCK↑ 1.5 1.5
t
h
Hold time
TDI after TCK↑
1 1
ns
TMS after TCK↑ 1.5 1.5
t
d
Delay time Power up to TCK↑ 50 50 ns
t
r
Rise time V
CC
power up 1 1 µs
PRODUCT PREVIEW information concerns products in the formative or
design phase of development. Characteristic data and other
specifications are design goals. Texas Instruments reserves the right to
change or discontinue these products without notice.