UM3089E Datasheet, PDF (1/14 Pages) Union Semiconductor, Inc. – ±15kV ESD-Protected, Fail-Safe, Hot-Swappable Auto Polarity Reversal RS-485 Transceivers

UM3089E
±15kV ESD-Protected, Fail-Safe, Hot-Swappable
Auto Polarity Reversal RS-485 Transceivers
UM3089E SOP14
General Description
The UM3089E series are +5.0V powered, ±15kV ESD protected, fail-safe, hot-swappable, auto
polarity reversal RS-485 transceivers. The device includes fail-safe circuitry, which guarantees a
logic-high receiver output when the receiver inputs are open, shorted or idle. This means that the
receiver output will be logic high if all transmitters on a terminated bus are disabled (high
impedance). The UM3089E features reduced slew-rate driver that minimizes EMI and reduces
reflections caused by improperly terminated cables, allowing error-free data transmission up to
500kbps. All transmitter outputs and receiver inputs are protected to ±15kV using the Human
Body Model and IEC61000-4-2, Air-Gap Discharge.
The UM3089E includes cable auto-invert functions that reverse the polarity of the RS485 bus pins
in case the cable is misconnected. Receiver’s full fail-safe features are maintained even when the
receiver polarity has been reversed.
The transceivers typically draw 300μA of supply current when unloaded, or when fully loaded
with the drivers disabled, and 1μA of supply current when shutdown. The device has a
1/8-unit-load receiver input impedance that allows up to 256 transceivers on the bus and is
intended for half-duplex communications. The device also has over current protection and thermal
shutdown protection.
Applications
Features
 Air-Condition, Building Lighting and  Automatic Polarity Reversal RS-485
Environmental Control Systems
Transceivers
 Industrial-Control Local Area
 1μA shutdown current and 300uA receiver
Networks
current
 PROFIBUS® and Other RS-485 Based  True Fail-Safe Receiver and Hot-Swappable
Field Bus Networks
 Enhanced Slew-Rate Limiting
 High Node Count RS-485 Systems
 Allows up to 256 Transceivers on the Bus
 Transceivers for EMI-Sensitive
 Thermal Shutdown
Applications
 Current-Limiting for Driver Overload
 Smart Meters/Automated Meter
Protection.
Reading Systems
 ESD Protection for RS-485 I/O Pins
±15kV—IEC61000-4-2, Air-Gap Discharge
±8kV—IEC61000-4-2, Contact Discharge
Pin Configurations
NC 1
RO 2
RE ³
DE 4
DI 5
NC 6
GND 7
14 VCC
13 NC
12 L2
11 L1
10 NC
9 NC
8 NC
Top View
14 13 12 11 10 9 8
UM3089EESD
XX
12 3456 7
XX: Week Code
Ordering Information
Part Number
Marking Code
UM3089EESD
UM3089EESD
Package Type
SOP14
Shipping Qty
2500pcs/13 Inch Tape & Reel
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http://www.union-ic.com Rev.02 Jan.2014
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