Datasheet

RS-485 Transceivers with Integrated
100 Ω /120 Ω Termination Resistors
MAX13450E/MAX13451E
_______________________________________________________________________________________ 9
Test Circuits and Waveforms (continued)
Figure 5. Driver-Enable and Disable-Timing Test Load
Figure 4. Driver Enable and Disable Times
Figure 7. Receiver Propagation Delays
Figure 6. Receiver Propagation Delay Test Circuit
V
L
/2
V
L
/2
V
CC
V
OH
0V
0V
OUTPUT NORMALLY LOW
DE
OUTPUT NORMALLY HIGH
t
DZL(SHDN)
,t
DZL
t
DZH(SHDN)
,t
DZH
t
DLZ
t
DHZ
(V
CC
+ V
OL
)/2
V
OH
/2
V
OL
+ 0.25V
V
OH
- 0.25V
A/Y, B/Z
A/Y, B/Z
V
OL
V
L
OUTPUT
UNDER TEST
500
Ω
S1
S2
V
CC
C
L
ATE
V
ID
A
B
R
RECEIVER
OUTPUT
V
L
/2
V
L
/2
1V
-1V
f = 1MHz, t
LH
≤ 3ns, t
HL
≤ 3ns
t
RPHL
t
RPLH
V
ROH
V
ROL
RO
A
B
t
RSKEW
= |t
RPHL
- t
RPLH
|