MAX14945 Datasheet, PDF (14/21 Pages) Maxim Integrated Products – 2.75kVRMS Isolated 500kbps Half-Duplex RS-485

MAX14945
2.75kV_RMS Isolated 500kbps Half-Duplex RS-485/
RS-422 Transceiver with ±30kV ESD Protection
Function Tables
TRANSMITTING
INPUTS
OUTPUTS
V_DDA
V_DDB
DE
TXD
A
B
≥ V_UVLOA
≥ V_UVLOB
1
1
1
0
≥ V_UVLOA
≥ V_UVLOB
1
0
0
1
≥ V_UVLOA
≥ V_UVLOB
0
X
High-Z
High-Z
< V_UVLOA
≥ V_UVLOB
X
X
High-Z
High-Z
≥ V_UVLOA
< V_UVLOB
X
X
High-Z
High-Z
< V_UVLOA
< V_UVLOB
X
X
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
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_UVLOA
≥ V_UVLOB
≥ V_UVLOB
0
Open/Short
1
1
X
High-Z
< V_UVLOA
≥ V_UVLOB
X
≥ V_UVLOA
< V_UVLOB
0
X
High-Z
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
www.maximintegrated.com
Maxim Integrated │  14