Rainbow Electronics MAX14770E - Manual (Page 6)

High-ESD Profibus RS-485 Transceiver
MAX14770E
6 ______________________________________________________________________________________
Figure 1. Driver DC Test Load
Figure 3. Driver Timing Test Circuit
Figure 4. Driver Propagation Delays
V OD
A
B
V OC
R L
2
R L
2
R L C L V ID
V CC
DI
DE
A
B
Figure 2. VODPP Swing Under Profibus Equivalent Load Test
V CC
DI
DE
A
B
V CC
195I
110I V OD
195I
1.5V 1.5V
0
DI
B
A
20%
80%
20%
80%
0
V O
-V O
V DIFF
t DSKEW = |t DPLH - t DPHL |
V DIFF = V A - V B
V CC
f = 1MHz, t LH P 3ns, t HL P 3ns
1/2 V O
t DPLH
t LH t HL
t DPHL
V
O
1/2 V O