ADM485E/ADM487E/ADM1487E
Rev. 0 | Page 11 of 16
TEST CIRCUITS AND SWITCHING CHARACTERISTICS
6356-003
Z
V
OD
V
OC
R
L
R
L
Figure 18. Driver DC Test Load
06356-004
DI
DE
DD
A
B
R
L
C
L
C
L
V
OD
Figure 19. Driver Timing Test Circuit
5
1.5V
1/2V
O
20%
80% 80%
20%
DI
A
B
0V
0V
V
O
V
O
–V
O
DIFF
t
SKEW
=
t
DPLH
– t
DPHL
V
DIFF
= V (A) – V (B)
t
DR
t
DPLH
t
DPHL
t
DF
1/2 V
O
06356-005
Figure 20. Driver Propagation Delays
GENERATOR
0 OR 5V
50Ω
R
L
= 500Ω
OUT
C
L
S1
1.5V
5V
0V
V
OH
0V
0.5V
2.3VOUT
DE
t
DHZ
t
DZH,
t
DZH(SHDN)
06356-006
D
Figure 21. Driver Enable and Disable Times (t
DHZ
, t
DZH
, t
DZH(SHDN)
)
GENERATOR
0V OR 5V
50Ω
D
R
L
= 500Ω
CC
OUT
C
L
S1
V
CC
/2
5V
0V
0.5V
2.3V
V
OL
OUT
V
CC
DE
t
DLZ
t
DZL,
t
DZL(SHDN)
06356-007
Figure 22. Driver Enable and Disable Times (t
DZL
, t
DLZ
, t
DZL(SHDN)
)
ATE
B
RECEIVER
OUTPUT
A
R
V
ID
6356-008
Figure 23. Receiver Propagation Delay Test Circuit
THE RISE TIME AND FALL TIME OF INPUT A AND INPUT B < 4ns
+1
–1V
t
RPHL
t
RPLH
1.5V
B
RO
V
OH
V
OL
A
06356-009
Figure 24. Receiver Propagation Delays
