SP337E 3.3V TO 5V RS-232/RS-485/RS-422 MULTIPROTOCOL TRANSCEIVER
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 SP337EUfeatures 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 0.1μF 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 fail safe protection to prevent oscillation when inputs are unconnected. In RS-232 mode, each receiver input has a 5kΩ 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.
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SP337E 、 SP337EBCT-L 、 SP337EBCY-L 、 SP337EBET-L 、 SP337EBEY-L 、 SP337EUCT-L 、 SP337EUCY-L 、 SP337EUET-L 、 SP337EUEY-L 、 RS-232 、 RS-485 、 RS-422 |
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[ Dual Protocol Serial Ports ][ RS-232 ][ RS-485 ][ Industrial Computers ][ Industrial ][ Process Control Equipment ][ Point-Of-Sales Equipment ][ Networking Equipment ][ HVAC Controls Equipment ][ Building Security Equipment ] |
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Datasheet |
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Please see the document for details |
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28-pin WSOIC;28-pin TSSOP |
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English Chinese Chinese and English Japanese |
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MARCH 2011 |
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REV. 1.0.2 |
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1.7 MB |
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