SP337E 3.3V TO 5V RS-232/RS-485/RS-422 MULTIPROTOCOL TRANSCEIVER July 5, 2021 Rev . 2.0.0 GENERAL DESCRIPTION FEATURES The SP337E is a dual mode serial transceiver containing both RS-232 and RS-485/422 line drivers 3.3V to 5V Single Supply Operation and receivers. The RS-232 mode provides three Robust 15kV ESD Protection drivers and five receivers to support all eight signals commonly used in the DB9 serial port connector Human Body Model (3TX/5RX). In RS-485 mode the device features two Max Data Rate of 15Mbps in RS-485 mode independent high speed RS-485/422 transmit and and up to 1Mbps in RS-232 mode (SP337EU) receive channels (2TX/2RX). The default RS-485 3 Drivers, 5 Receivers RS-232/V.28 configuration is full-duplex, but half-duplex operation can be obtained by tying together the TX and RI pins, 2 Drivers, 2 Receivers RS-485/RS-422 and the TXEN and RXEN signals. Full-Duplex Configuration 1/8th Unit Load, up to 256 receivers on bus The SP337E is pin compatible to MaxLinears SP334. RS-485 Advanced Failsafe on Open, Short or The SP337EB features a maximum data rate of Terminated Lines 250kbps in RS-232 mode and a maximum data rate of 15Mbps in RS-485. However, the SP337EU Full Differential Driver Tri-State (Hi-Z) Control features a maximum data rate of 1Mbps in RS-232 Receiver Output Tri-State Control mode and a maximum data rate of 15Mbps in RS-485 mode. TSSOP-28 Package The MaxLinear-patented high efficiency charge pumps (5,306,954) deliver true RS-232 driver output TYPICAL APPLICATIONS voltages from a single power supply from 3.3V to 5V. Charge pump outputs are self-monitored to minimize Dual Protocol Serial Ports (RS-232 or RS-485) power consumption. The SP337E requires only four Industrial Computers 0.1F capacitors for complete functionality. Industrial and Process Control Equipment All RS-485 receivers or transceivers feature high impedance inputs which allow up to 256 transceivers Point-Of-Sales Equipment on a single shared bus. When configured in RS-485 Networking Equipment mode, each driver may be individually enabled or put into tri-state, simplifying use on shared buses or for HVAC Controls Equipment bidirectional communication. The RS-485/422 drivers Building Security Equipment 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 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. 1 SP337E 3.3V TO 5V RS-232/RS-485/RS-422 MULTIPROTOCOL TRANSCEIVER FIGURE 1. TYPICAL RS-232 AND RS-485 APPLICATION CIRCUITS ORDERING INFORMATION PART NUMBER OPERATING TEMPERATURE RANGE PACKAGE PACKAGING METHOD LEAD-FREE SP337EBEY-L -40C to +85C 28-pin TSSOP Tube Yes SP337EBEY-L/TR -40C to +85C 28-pin TSSOP Tape and Reel Yes SP337EUEY-L -40C to +85C 28-pin TSSOP Tube Yes SP337EUEY-L/TR -40C to +85C 28-pin TSSOP Tape and Reel Yes XR21B1420IL28-0A-EVB The XR21B1420 Evaluation Board includes the SP339E transceiver. NOTE: For the most up-to-date ordering information and additional information on environmental rating, go to w ww.maxlinear.com/SP337. 208DSR00 2 Rev. 2.0.0