SP336E 3.3V / 5V PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER MARCH 2018 REV. 1.1.0 FEATURES GENERAL DESCRIPTION 3.3V or 5V Single Supply Operation The SP336E is a monolithic serial multi-transceiver device that contains both RS-232 and RS-485/RS- Robust 15kV ESD Protection (IEC 61000-4-2 Air 422 line drivers and receivers. The configuration of Gap) the SP336E can be reconfigured into eight operating Software Selectable Mode Selection modes including RS-232 only (4TX/4RX), RS-485/ RS-422 only (2TX/2RX) full or half duplex, two RS- Up to 4 Drivers, 4 Receivers RS-232/V.28 232/RS-485 mixed modes. two shutdown modes and Up to 2 Drivers, 2 Receivers RS-485/RS-422 a diagnostic loop-back mode. Modes may be selected at any time by changing the logic state of the Full or Half Duplex Configurations three MODE pins. The device can implement a dual- 1/8th Unit Load, up to 256 receivers on bus mode serial port, mixed mode ports or as an interface Mixed RS-232/RS-485 modes signal translator. The MaxLinear charge pumps deliver true RS-232 driver output voltages from a Pin Programmable Slew Rate for Reduced EMI single power supply at either 3.3V or 5V. The SP336E RS-485 Advanced Failsafe on Open, Short or requires only four 0.1 F capacitors for charge pump. Terminated Lines A slew rate control pin configures driver outputs for either high data rate or slew-controlled data rates. Diagnostic Loop-Back Function Slew-controlled outputs minimize problems with 28 Pin SOIC or TSSOP Packaging reflections and ringing on long or un-terminated cables. All RS-485 receivers or transceivers feature high impedance which allow up to 256 transceivers TYPICAL APPLICATIONS on a shared bus. When configured in RS-485/RS-422 mode, each driver may be individually enabled or put Factory Automation Equipment into tri-state, simplifying use on shared buses or bidirectional communication. All receivers have Security Networks advanced failsafe protection to prevent oscillation Industrial/Process Control Networks when inputs are un-connected. In RS-232 mode each receiver input has a 5k ohm pull-down to ground. Point-Of-Sales Equipment Differential Receivers will default to output logic 1 if Gaming Machines inputs are floating, shorted or open but terminated. All driver outputs and receiver inputs are protected Serial Protocol Translators (ex. RS-232 to RS-485/ against ESD strikes up to 15,000 volts. RS-422) Embedded Industrial PCs Building Environmental Control Systems (ex. HVAC) Cable Repeaters / Port Extenders / Hubs 1SP336E 3.3V / 5V PROGRAMMABLE RS-232/RS-485/RS-422 SERIAL TRANSCEIVER REV. 1.1.0 FIGURE 1. TYPICAL RS-232 APPLICATION CIRCUIT +3.3V or +5V 1.0F 5 9 VCC C1+ 0.1F 10 0.1F 12 V+ C1- 14 11 SP336E V- C2+ 0.1F 13 0.1F C2- 24 25 Logic 0 MODE 0 SLEW Logic 1 or 0 2 Logic 0 MODE 1 23 Logic 1 MODE 2 T1 Out 6 TI In 26 T1 RS-232 TTL/CMOS T2 Out 7 T2 In 27 T2 RS-232 TTL/CMOS T3 Out 4 28 T3 In T3 RS-232 TTL/CMOS T4 Out 3 1 T4 In T4 RS-232 TTL/CMOS 19 R1 Out R1 In 15 TTL/CMOS R1 RS-232 20 R2 Out R2 In 16 TTL/CMOS R2 RS-232 21 R3 Out R3 In 17 TTL/CMOS R3 RS-232 22 R4 Out R4 In 18 TTL/CMOS R4 RS-232 8 GND 2