SP3495E-3497E HIGH SPEED +3.3V RS-485/RS-422 TRANSCEIVERS WITH +/-15KV ESD PROTECTION AND ADVANCED FAILSAFE MAY 2009 REV. 1.0.0 and outputs are ESD protected up to +/-15kV Human GENERAL DESCRIPTION Body Model. The SP3495E - SP3497E transceivers are suitable FEATURES for high speed bidirectional communication on multipoint bus transmission lines. They are designed 3.3V Single Supply Operation for balanced data transmission and comply with both RS-485 and RS-422 EIA standards. Each device High Speed up to 32Mbps contains one differential driver and one differential Robust +/-15kV ESD protection receiver Hot Swap glitch protection Driver differential outputs and receiver differential inputs are connected internally to form a half-duplex Advanced Fail-safe Receiver Inputs input/output to the RS-485 bus. Separate RE and DE Half Unit Load, 64 Transceivers on bus pins enable and disable the driver and receiver independently or may be externally connected Driver short circuit current limit and thermal together as a direct control. The device enters a low shutdown for overload protection power shutdown mode if both driver and receiver are Low Current 1uA shutdown mode disabled. the bus-pin outputs of disabled or powered down devices are in high impedance state. The high TYPICAL APPLICATIONS impedance driver output is maintained over the entire common-mode voltage range of -7V to +12V. Factory Automation Controls SP3495E - SP3497E operates from a single 3.3V Motor Control power supply. SP3495E - SP3497E transceivers load the data bus only half as much as a standard RS-485 Industrial Process Control unit load. This allows up to 64 devices to be Building Automation connected simultaneously on a bus without violating required RS-485 signal margin and without using Security Systems repeaters. Excessive power dissipation caused by Remote Utility Meter Reading bus contention or by shorting outputs to ground or a voltage source is prevented by short circuit protection Long or un-terminated transmission lines and thermal shutdown. This feature forces the driver output into high impedance state if the absolute value of the output current exceeds 250mA or if junction temperature exceeds 165C. Receivers will fail-safe to a logic high output state if the inputs are unconnected (floating) or shorted. All RS-485 inputs FIGURE 1. TYPICAL APPLICATION CIRCUIT Exar Corporation 48720 Kato Road, Fremont CA, 94538 (510) 668-7000 FAX (510) 668-7017 www.exar.com SP3495E-3497E HIGH SPEED +3.3V RS-485/RS-422 TRANSCEIVERS WITH +/-15KV ESD PROTECTION AND ADVANCED FAILSAFE REV. 1.0.0 FIGURE 2. PIN OUT ASSIGNMENT SP3495E 8-Pin Half Duplex 8 1 VCC RO R 2 7 RE B 3 6 DE A 4 DI D 5 GND SP3496E 8-pin Full Duplex 1 Vcc 8 A 2 R R 7 B 6 Z 3 D D 5 4 Y GND SP3497E 14-pin Full Duplex 14 1 Vcc NC 13 NC 12 A 2 R R 11 B 3 RE 4 DE 10 Z 5 D D 6 9 Y GND 8 7 NC GND ORDERING INFORMATION OPERATING TEMPERATURE PART NUMBER PACKAGE DEVICE STATUS RANGE SP3495EEN-L 8-pin Narrow SOIC -40C to +85C Active SP3495EEN-L/TR 8-pin Narrow SOIC -40C to +85C Active SP3496EEN-L 8-pin Narrow SOIC -40C to +85C Active SP3496EEN-L/TR 8-pin Narrow SOIC -40C to +85C Active SP3497EEN-L 14-pin Narrow SOIC -40C to +85C Active SP3497EEN-L/TR 14-pin Narrow SOIC -40C to +85C Active Note: To order Tape and Reel option include/T in ordering part number. All packages are Pb-free/ RoHS compliant. 2