Datasheet

+3V to +5V, 2500V
RMS
Isolated RS-485/RS-422
Transceivers with ±15kV ESD Protection
Pin Description
PIN NAME ISOLATION SIDE FUNCTION
1V
CC1
Logic
Logic-Side/Transformer-Driver Power Input. Bypass V
CC1
to GND1 with 10µF and 0.1µF
capacitors.
2 ST1 Logic
Transformer-Driver Phase 1 Power Output. Connect ST1 to isolation-transformer
primary to send power to isolation side of barrier.
3 ST2 Logic
Transformer-Driver Phase 2 Power Output. Connect ST2 to isolation-transformer
primary to send power to isolation side of barrier.
4 GND1 Logic Logic-Side Ground. For isolated operation do not connect to GND2.
5–10,
19–24
— — Removed from Package
11 GND2 Isolated Isolation-Side Ground. For isolated operation do not connect to GND1.
12 Z Isolated
RS-485/RS-422 Inverting Driver Output. Output floats when DE is low or in a barrier fault
event. (See the Detailed Description section for more information.)
13 Y Isolated
RS-485/RS-422 Noninverting Driver Output. Output floats when DE is low or in a barrier
fault event. (See the Detailed Description section for more information.)
14 V
CC2
Isolated
Isolated-Side Power Input. Connect V
CC2
to the rectified output of transformer
secondary. Bypass V
CC2
to GND2 with 10µF and 0.1µF capacitors.
15 B Isolated RS-485/RS-422 Differential-Receiver Inverting Input
16 A Isolated RS-485/RS-422 Differential-Receiver Noninverting Input
17 RO2 Isolated
Isol ated - S i d e Recei ver O utp ut. RO2 i s al w ays enab l ed . RO 2 g oes hi g h i f A - B > - 10m V .
RO2 g oes l ow i f A - B < - 200m V . Fai l - safe ci r cui tr y causes RO 2 to g o hi g h w hen A and B
fl oat or ar e shor ted .
18 SLO Isolated
Driver Slew-Rate Control Logic Input. Connect SLO to GND2 for data rates up to
400kbps. Connect SLO to V
CC2
or leave floating for high data rates.
25 DI Logic
Driver Input. Pull DI low (high) to force driver output Y low (high) and driver output Z
high (low).
26 DE Logic
Driver-Enable Input. The driver outputs are enabled and follow the driver input (DI)
when DE is high. When DE is floated, the driver is disabled. DE does not affect whether
the receiver is on or off.
27 RE Logic
Receiver-Output Enable and Fault Current Output. The receiver output (RO1) is
enabled and follows the differential-receiver inputs, A and B, when RE is low, otherwise
RO1 floats. RE does not affect RO2 and does not disable the driver. The asserted fault
output is a pullup current, otherwise RE shows a pulldown current.
28 RO1 Logic
Receiver Output. RO1 is enabled when RE is low. RO1 goes high if A - B > -10mV. RO1
goes low if A - B < -200mV. Fail-safe circuitry causes RO1 to go high when A and B
float or are shorted.
MAX3535E/MXL1535E
Maxim Integrated
13