Datasheet

SN54ABTH18502A, SN54ABTH182502A, SN74ABTH18502A, SN74ABTH182502A
SCAN TEST DEVICES
WITH 18-BIT UNIVERSAL BUS TRANSCEIVERS
SCBS164E – AUGUST 1993 – REVISED DECEMBER 1996
29
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
timing requirements over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (normal mode) (see Figure 14)1
SN54ABTH18502A SN74ABTH18502A
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 3.8 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 4.0 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↑ 2.9 0.5
ns
t
h
Hold
time
A after LEAB↓ or B after LEBA↓ 4.0 3
ns
timing requirements over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted) (test mode) (see Figure 14)
SN54ABTH18502A SN74ABTH18502A
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↑ 2.9 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
* On products compliant to MIL-PRF-38535, this parameter is not production tested.