MAX14941 Datasheet, PDF (13/21 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
Pin Description (continued)
PIN
NAME
MAX14941 MAX14942
7
-
PV
-
7
SBA
REFERENCE
FUNCTION
GNDA
GNDA
Power Valid Input. Hold PV low to disable the driver while the supplies
stabilize. Pull PV high when power is stable to enable the driver. PV has an
internal 4.5µA pull-up to VDDA.
Side B Active Indicator Output. SBA asserts low when side B is powered and
working. SBA has an internal 5kΩ pull-up resistor to V_DDA.
9, 15
9, 15 GNDB
-
Cable-Side Ground. GNDB is the ground reference for the internal LDO, the
DEM output, and the Profibus/RS-485 bus signals.
10
-
DEM
GNDB
Driver Enable Monitor Output. DEM is high when the transmitter is enabled.
See the Function Tables for more information.
14
10, 14
N.C.
-
No Connection. Not internally-connected.
LDO Power Input. Connect a minimum voltage of 4.68V to VLDO to power the
11
11
VLDO
GNDB
cable-side of the transceiver. Bypass VLDO to GNDB with both 0.1µF and 1µF
capacitors as close to the device as possible. To disable the internal LDO, leave
VLDO unconnected or connect to GNDB.
12
12
A
GNDB
Noninverting Receiver Input and Noninverting Driver Output
13
13
B
GNDB
Inverting Receiver Input and Inverting Driver Output
Cable-Side Power Input/Isolated LDO Power Output. Bypass VDDB to GNDB
with both 0.1µF and 1μF capacitor as close to the device as possible. V_DDB
16
16
VDDB
GNDB
is the output of the internal LDO when power is applied to VLDO. When the
internal LDO is not used (VLDO is unconnected or connected to GNDB), VDDB
is the positive supply input for the cable-side of the IC.
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