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MAX14938 Datasheet, PDF (15/22 Pages) Maxim Integrated Products – 2.75kVRMS Isolated 20Mbps Half-Duplex PROFIBUS | |||
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MAX14938/MAX14939
2.75kVRMS Isolated 20Mbps Half-Duplex PROFIBUS/
RS-485 Transceivers with ±35kV ESD Protection
Function Tables
TRANSMITTING
INPUTS
OUTPUTS
VDDA
VDDB
DE
TXD
PV**
A
B
DEM**
⥠VUVLOA
⥠VUVLOB
1
1
1
1
0
1
⥠VUVLOA
⥠VUVLOB
1
0
1
0
1
1
⥠VUVLOA
⥠VUVLOB
0
X
X
High-Z
High-Z
0
< VUVLOA
⥠VUVLOB
X
X
X
High-Z
High-Z
0
⥠VUVLOA
< VUVLOB
X
X
X
High-Z
High-Z
0
< VUVLOA
< VUVLOB
X
X
X
High-Z
High-Z
0
*Note: Drive DE low to disable the transmitter outputs. Drive DE high to enable the transmitter outputs. DE has an internal pull-down
to GNDA.
** MAX14938 only, X = Donât care
RECEIVING
INPUTS
OUTPUTS
VDDA
VDDB
RE
(VA- VB)
RXD
⥠VUVLOA
⥠VUVLOB
0
> -50mV
1
⥠VUVLOA
⥠VUVLOB
0
< -200mV
0
⥠VUVLOA
⥠VUVLOB
0
Open/Short
1
⥠VUVLOA
⥠VUVLOB
1
X
High-Z
< VUVLOA
⥠VUVLOB
X
X
High-Z
⥠VUVLOA
< VUVLOB
0
X
1
< VUVLOA
< VUVLOB
X
X
High-Z
*Note: Drive RE high to disable the receiver output. Drive RE low to enable to receiver output. RE has an internal pulldown to GNDA.
X = Donât care
VDDA
< VUVLOA
< VUVLOA
⥠VUVLOA
⥠VUVLOA
SBA
VDDB
< VUVLOB
⥠VUVLOB
< VUVLOB
⥠VUVLOB
SBA
High
High
High
Low
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