SP3495E Datasheet | Exar

DESCRIPTION The SP3495E - SP3497E transceivers are suitable for high speed bidirectional munication on multipoint bus transmission lines. They are designed for balanced data transmission and ply with both RS-485 and RS-422 EIA standards. Each device contains one differential driver and one differential receiver Driver differential outputs and receiver differential inputs are connected internally to form a half-duplex input/output to the RS-485 bus. Separate RE and DE pins enable and disable the driver and receiver independently or may be externally connected together as a direct control. The device enters a low power shutdown mode if both driver and receiver are disabled. the bus-pin outputs of disabled or powered down devices are in high impedance state. The high impedance driver output is maintained over the entire mon-mode voltage range of -7V to +12V. SP3495E - SP3497E operates from a single 3.3V power supply. SP3495E - SP3497E transceivers load the data bus only half as much as a standard RS-485 unit load. This allows up to 64 devices to be connected simultaneously on a bus without violating required RS-485 signal margin and without using repeaters. Excessive power dissipation caused by bus contention or by shorting outputs to ground or a voltage source is prevented by short circuit protection and thermal shutdown. This feature forces the driver output into high impedance state if the absolute value of the output current exceeds 250m A or if junction temperature exceeds 165°C. 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 and outputs are ESD protected up to +/-15k V Human Body Model. FEATURES - 3.3V Single Supply Operation - High Speed up to 32Mbps - Robust +/-15k V ESD protection - Hot Swap glitch protection - Advanced Fail-safe Receiver Inputs - Half Unit Load, 64 Transceivers on bus - Driver short circuit current limit and thermal shutdown for...