MAX14941 Datasheet, PDF (14/21 Pages) Maxim Integrated Products – 5kV Isolated 20Mbps Half-Duplex PROFIBUS

MAX14941/MAX14942
5kV Isolated 20Mbps Half-Duplex PROFIBUS/
RS-485 Transceivers with ±35kV ESD Protection
Function Tables
TRANSMITTING
INPUTS
OUTPUTS
V_DDA
V_DDB
DE
TXD
PV**
A
B
DEM**
≥ V_UVLOA
≥ V_UVLOB
1
X
0
High-Z
High-Z
1
≥ V_UVLOA
≥ V_UVLOB
1
1
1
1
0
1
≥ V_UVLOA
≥ V_UVLOB
1
0
1
0
1
1
≥ V_UVLOA
≥ V_UVLOB
0
X
X
High-Z
High-Z
0
< V_UVLOA
≥ V_UVLOB
X
X
X
High-Z
High-Z
0
≥ V_UVLOA
< V_UVLOB
X
X
X
High-Z
High-Z
0
< V_UVLOA
< V_UVLOB
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.
** MAX14941 only, X = Don’t care
RECEIVING
INPUTS
OUTPUTS
V_DDA
V_DDB
RE
(V_A- V_B)
RXD
≥ V_UVLOA
≥ V_UVLOB
0
> -50mV
1
≥ V_UVLOA
≥ V_UVLOB
0
< -200mV
0
≥ V_UVLOA
≥ V_UVLOB
0
Open/Short
1
≥ V_UVLOA
≥ V_UVLOB
1
X
High-Z
< V_UVLOA
≥ V_UVLOB
X
X
High-Z
≥ V_UVLOA
< V_UVLOB
0
X
1
< V_UVLOA
< V_UVLOB
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 pull-down to
GNDA.
X = Don’t care
V_DDA
< V_UVLOA
< V_UVLOA
≥ V_UVLOA
≥ V_UVLOA
SBA
V_DDB
< V_UVLOB
≥ V_UVLOB
< V_UVLOB
≥ V_UVLOB
SBA
High
High
High
Low
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