SP337E Datasheet | MaxLinear

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 monly 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 patible to Max Linear’s SP334. The SP337EB features a maximum data rate of 250kbps in RS-232 mode and a maximum data rat e 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 Max Linear-patented high efficiency charge pumps (5,306,954) deliver true RS-232 driver out put 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 plete 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 bus es or for bidirectional munication. The RS-485/422 drivers can be disabled (high-Z output) by the TXEN enabl e 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 5kΩ pulldown 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 ±15k V ESD...