MAX14938 Datasheet, PDF (8/22 Pages) Maxim Integrated Products – 2.75kVRMS Isolated 20Mbps Half-Duplex PROFIBUS

MAX14938/MAX14939
2.75kV_RMS Isolated 20Mbps Half-Duplex PROFIBUS/
RS-485 Transceivers with ±35kV ESD Protection
Y
RL
2
VOD
RL
VOC
2
Z
(a)
375Ω
Y
VOD
60Ω
Z
375Ω
(b)
Figure 1. Driver DC Test Load
+
-
VCM
VDDB
VDDA
TXD
GNDA
A
B
GNDB
195I
110I V_OD
195I
Figure 2. V_ODPP Swing Under PROFIBUS Equivalent Load Test
TXD
A
VOD
B
RL
CL
GNDA
Figure 3. Driver Timing Test Circuit
f = 1MHz, tLH P 3ns, tHL P 3ns
TXD
50%
50%
B
A
VO
1/2 VO
VDIFF
20%
tLH
Figure 4. Driver Propagation Delays
tDPLH
tDPHL
V_DIFF = V_A - V_B
80%
80%
tHL
tDSKEW = |tDPLH - tDPHL|
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VDDA
1/2 VO
GNDA
VO
0
20%
-VO
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