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SP337EEY-L Datasheet(PDF) 1 Page - Exar Corporation |
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SP337EEY-L Datasheet(HTML) 1 Page - Exar Corporation |
1 / 18 page Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com SP337E 3.3V TO 5V RS-232/RS-485/RS-422 MULTIPROTOCOL TRANSCEIVER MARCH 2011 REV. 1.0.2 GENERAL DESCRIPTION The SP337E is a dual mode serial transceiver containing both RS-232 and RS-485/422 line drivers and receivers. The RS-232 mode provides three drivers and five receivers to support all eight signals commonly used in the DB9 serial port connector (3TX/5RX). In RS-485 mode the device features two independent high speed RS-485/422 transmit and receive channels (2TX/2RX). The default RS-485 configuration is full-duplex, but half-duplex operation can be obtained by tying together the TX and RI pins, and the TXEN and RXEN signals. The SP337E is pin compatible to Exar’s SP334. The SP337EB features a maximum data rate of 250kbps in RS-232 mode and a maximum data rate of 15Mbps in RS-485. However, the SP337EU features a maximum data rate of 1Mbps in RS-232 mode and a maximum data rate of 15Mbps in RS-485 mode. The Exar-patented high efficiency charge pumps (5,306,954) deliver true RS-232 driver output voltages from a single power supply from 3.3V to 5V. Charge pump outputs are self-monitored to minimize power consumption. The SP337E requires only four 0.1 μF capacitors for complete functionality. All RS-485 receivers or transceivers feature high impedance inputs which allow up to 256 transceivers on a single shared bus. When configured in RS-485 mode, each driver may be individually enabled or put into tri-state, simplifying use on shared buses or for bidirectional communication. The RS-485/422 drivers can be disabled (high-Z output) by the TXEN enable pin. The RS-232 receiver outputs can be disabled by the RXEN enable pin. All receivers have advanced failsafe protection to prevent oscillation when inputs are un-connected. In RS-232 mode, each receiver input has a 5k Ω pull- down to ground. in RS-485 mode, receivers will default to output logic 1 if inputs are floating, shorted, or open but terminated. All driver outputs and receiver inputs are protected against ESD strikes up to +/-15,000 volts. FEATURES • 3.3V to 5V Single Supply Operation • Robust +/-15kV ESD Protection ■ Human Body Model • Max Data Rate of 15Mbps in RS-485 mode and up to 1Mbps in RS-232 mode (SP337EU) • 3 Drivers, 5 Receivers RS-232/V.28 • 2 Drivers, 2 Receivers RS-485/RS-422 ■ Full-Duplex Configuration ■ 1/8th Unit Load, up to 256 receivers on bus • RS-485 Advanced Failsafe on Open, Short or Terminated Lines • Full Differential Driver Tri-State (Hi-Z) Control • Receiver Output Tri-State Control • WSOIC-28 or TSSOP-28 Package TYPICAL APPLICATIONS • Dual Protocol Serial Ports (RS-232 or RS-485) • Industrial Computers • Industrial and Process Control Equipment • Point-Of-Sales Equipment • Networking Equipment • HVAC Controls Equipment • Building Security Equipment |
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