10Mbps RS-485 RS-422 Slew Rate Limited Transceivers MAX3089E
MAX3089E
,RS-422 Slew Rate Limited Transceivers
,RS-485 Slew Rate Limited Transceivers
MAX3089E ±15kVESD-Protected,Fail-Safe,High-Speed (10Mbps), Slew-Rate-Limited RS-485/RS-422 Transceivers
Description
The MAX3080E–MAX3089E are ±15kV electrostatic discharge (ESD)-protected, high-speed transceivers for RS485/RS-422 communication that contain one driver and one receiver. These devices feature fail-safe circuitry, which guarantees a logic-high receiver output when the receiver inputs are open or shorted. This means that the receiver output will be a logic high if all transmitters on a terminated bus are disabled (high impedance). The MAX3080E/MAX3081E/MAX3082E feature reduced slew-rate drivers that minimize EMI and reduce reflections caused by improperly terminated cables, allowing error-free data transmission up to 115kbps. The MAX3083E/MAX3084E/MAX3085E offer higher driver output slew-rate limits, allowing transmit speeds up to 500kbps. The MAX3086E/MAX3087E/ MAX3088Es’ driver slew rates are not limited, making transmit speeds up to 10Mbps possible. The MAX3089E’s slew rate is selectable between 115kbps, 500kbps, and 10Mbps by driving a selector pin with a single three-state driver. All devices feature enhanced ESD protection. All transmitter outputs and receiver inputs are protected to ±15kV using the Human Body Model. These transceivers typically draw 375µA of supply current when unloaded, or when fully loaded with the drivers disabled. All devices have a 1/8-unit-load receiver input impedance that allows up to 256 transceivers on the bus. The MAX3082E/MAX3085E/MAX3088E are intended for halfduplex communications, while the MAX3080E/MAX3081E/ MAX3083E/MAX3084E/MAX3086E/MAX3087E are intended for full-duplex communications. The MAX3089E is selectable between half-duplex and full-duplex operation. It also features independently programmable receiver and transmitter output phase via separate pins.
Key Features
♦ ESD Protection for RS-485 I/O Pins ±15kV, Human Body Model
♦ True Fail-Safe Receiver While Maintaining EIA/TIA-485 Compatibility
♦ Enhanced Slew-Rate Limiting Facilitates Error-Free Data Transmission (MAX3080E–MAX3085E/MAX3089E)
♦ 1nA Low-Current Shutdown Mode (Except MAX3081E/MAX3084E/MAX3087E)
♦ Pin-Selectable Full/Half-Duplex Operation (MAX3089E)
♦ Phase Controls to Correct for Twisted-Pair Reversal (MAX3089E)
♦ Allow Up to 256 Transceivers on the Bus
Applications/Uses
RS-422/RS-485 Communications
Level Translators
Transceivers for EMI-Sensitive Applications
Industrial-Control Local Area Networks
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