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SP335E Datasheet(PDF) 1 Page - Exar Corporation |
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SP335E Datasheet(HTML) 1 Page - Exar Corporation |
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1 / 23 page  1 SP335E RS-232/RS-485/RS-422 TRANSCEIVER WITH INTERNAL TERMINATION August 2017 Rev. 1.0.2 GENERAL DESCRIPTION The SP335 is an advanced multiprotocol transceiver supporting RS-232, RS-485, and RS-422 serial standards. Integrated cable termination and multiple configuration modes allow all three protocols to be used interchangeably over a single cable or connector with no additional switching components. Full operation requires only four external charge pump capacitors. The RS-485/RS-232 mode pin selects RS-485 mode when high, and RS-232 mode when low. In RS-485 mode, the TERM pin enables the differential 120 termination, and the HALF/FULL pin configures the transceiver as either half or full duplex. The high speed drivers operate up to 20Mbps in RS- 485/422 modes, and up to 1Mbps in RS-232 mode. All drivers can be slew limited to 250kbps in any mode to minimize electromagnetic interference (EMI) by setting the dedicated SLEW pin low. All transmitter outputs and receiver inputs feature robust electrostatic discharge (ESD) protection to ±15kV IEC 61000-4-2 Airgap, ±15kV Human Body Model (HBM) and ±8kV IEC 61000-4-2 Contact. Each receiver output has full fail-safe protection to avoid system lockup, oscillation, or indeterminate states by defaulting to logic-high output level when the inputs are open, shorted, or terminated but undriven. No external biasing resistors are required. The RS-232 receiver inputs include a 5k pull-down to ground when in RS-232 mode. The RS-485/422 receiver inputs are high impedance (>96k when termination is disabled), allowing up to 256 devices on a single communication bus (1/8th unit load). The SP335 operates from a single power supply, either 3.3V or 5V, with low idle current. The shutdown mode consumes less than 1µA in low power standby operation with RS-232 receivers enabled. FEATURES Pin-Selectable Cable Termination No External Resistors Required for RS-485/422 Termination or Biasing Robust ESD Protection: ■ ±15kV IEC 61000-4-2 Air Gap Discharge ■ ± 8kV IEC 61000-4-2 Contact Discharge ■ ±15kV Human Body Model (HBM) 20Mbps RS-485 and 1Mbps RS-232 Data Rates Pin-Selectable 250kbps Slew Limiting Single Supply Operation from 3V to 5.5V 1.65V to 5.5V Logic Interface V L pin 2 Drivers, 2 Receivers RS-232/V.28 1 Driver, 1 Receiver RS-485/422 ■ Full or Half Duplex Configuration ■ 1/8th Unit Load, up to 256 receivers on bus RS-485/422 Enhanced Receiver Fail-safe for open, shorted, or terminated but idle inputs 10nA Shutdown Supply Current (typical) Small 32 QFN package (5mm x 5mm) TYPICAL APPLICATIONS Software Programmable Serial Ports (RS-232, RS-422, RS-485) Industrial and Single Board Computers Industrial and Process Control Equipment Point-Of-Sale Equipment HVAC Controls and Networking Equipment Building Security and Automation ORDERING INFORMATION(1) PART NUMBER OPERATING TEMPERATURE RANGE LEAD-FREE PACKAGE PACKAGE METHOD SP335EER1-L -40°C to +85°C Yes(2) 32-pin QFN Tray SP335EER1-L/TR Reel SP335ECR1-L 0°C to +70°C Tray SP335ECR1-L/TR Reel SP335EER1-0A-EB SP335E Evaluation Board NOTES: 1. Refer to www.exar.com/SP335E for most up-to-date Ordering Information 2. Visit www.exar.com for additional information on Environmental Rating |
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