MAX14948 Datasheet, PDF (14/21 Pages) Maxim Integrated Products – 5kVRMS Isolated 500kbps Half-Duplex RS-485

MAX14948
5kV_RMS Isolated 500kbps Half-Duplex RS-485/
RS-422 Transceiver with ±30kV ESD Protection
Function Tables
TRANSMITTING
INPUTS
OUTPUTS
V_DDA
V_DDB
DE
≥ V_UVLOA
≥ V_UVLOB
1
≥ V_UVLOA
≥ V_UVLOB
1
≥ V_UVLOA
≥ V_UVLOB
0
< V_UVLOA
≥ V_UVLOB
X
≥ V_UVLOA
< V_UVLOB
X
< V_UVLOA
< V_UVLOB
X
TXD
1
0
X
X
X
X
A
1
0
High-Z
High-Z
High-Z
High-Z
B
0
1
High-Z
High-Z
High-Z
High-Z
*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.
X = Don’t care
V_DDA
≥ V_UVLOA
≥ V_UVLOA
≥ V_UVLOA
≥ V_UVLOA
< V_UVLOA
≥ V_UVLOA
< V_UVLOA
V_DDB
≥ V_UVLOB
≥ V_UVLOB
≥ V_UVLOB
≥ V_UVLOB
≥ V_UVLOB
< V_UVLOB
< V_UVLOB
INPUTS
RECEIVING
RE
0
0
0
1
X
0
X
(V_A- V_B)
> -50mV
< -200mV
Open/Short
X
X
X
X
OUTPUTS
RXD
1
0
1
High-Z
High-Z
1
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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