SP331CT-L MaxLinear

SP331 Programmable Dual RS-232/RS-485 Transceiver Description FEATURES +5V Only Operation The SP331 is a programmable RS-232 and/or RS-485 transceiver IC. Software Programmable RS-232 or The SP331 contains four drivers and four receivers when selected in RS-485 Selection RS-232 mode and two drivers and two receivers when selected in Four RS-232 Transceivers in RS-232 Mode RS-485 mode. The SP331 also contains a dual mode which has two Two RS-485 Full-Duplex Transceivers in RS-232 drivers/receivers plus one differential RS-485 driver/receiver . RS-485 Mode The RS-232 transceivers can typically operate at 230kbps while Two RS-232 Transceivers and One adhering to the RS-232 specifications. The RS-485 transceiv- RS-485 Transceiver in Dual Mode ers can operate up to 10Mbps while adhering to the RS-485 Self-Testing Loopback Mode specifications. The SP331 includes a self-test loopback mode where Full Driver Tri-State (Hi-Z) Control the driver outputs are internally configured to the receiver inputs. Ideal for RS-232 to RS-485 conversion This allows for easy diagnostic serial port testing without using an external loopback plug. The RS-232 and RS-485 drivers can be disabled (High-Z output) by controlling a set of four select pins. Ordering Information - Back Page Typical Applications Circuit +5V 5 9 VCC C1+ 0.1F 10 0.1F 12 V+ C1- 14 11 SP331 V- C2+ 0.1F 13 0.1F C2- 24 23 +5V SEL A SEL D 0V 2 SEL B +5V Vcc TX2 7 400K RS-485 26 TI1 TTL/CMOS T1 6 TX1 27 RS-485 TI2 TTL/CMOS Vcc TX4 3 400K RS-485 TI3 28 T3 TTL/CMOS 4 TX3 RS-485 1 TI4 TTL/CMOS RI2 16 RS-485 RX1 19 TTL/CMOS R1 15K RI1 15 RS-485 20 RX2 15K TTL/CMOS RI4 18 RS-485 21 RX3 15K TTL/CMOS R3 RI3 17 RS-485 22 15K RX4 TTL/CMOS 25 0V 8 SEL C GND REV 1.0.1 1/13SP331 Absolute Maximum Ratings These are stress ratings only and functional operation of the Storage Temperature .................................-65C to +150C device at these ratings or any other above those indicated Power Dissipation in the operation sections of the specifications below is not 28-pin WSOIC .............................1000mW implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. Package Derating V ................................................................................+7V CC 28-pin WSOIC Input Voltages ................................................ 40C/W JA NOTE: Logic ........................ -0.5V to (V + 0.5V) CC 1. Exceeding the maximum data rate of 8Mbps at TA = 85C may permanently damage the device. Drivers ..................... -0.5V to (V + 0.5V) CC Receivers ........................30V 100mA Driver Outputs .............................................................15V (1) Maximum Data Rate ............................................... 8Mbps Electrical Characteristics Limits are specified at T = 25C and V = +5.0V unless otherwise noted. A CC PARAMETER MIN. TYP. MAX. UNITS CONDITIONS Logic Inputs V 0.8 V IL V 2.0 V IH Logic Outputs V 0.4 V I = -3.2mA OL OUT V 2.4 V I = 1.0mA OH OUT RS-232 Driver DC Characteristics HIGH Level Output +5.0 +15.0 V R = 3k, V = 0.8V L IN LOW Level Output -15.0 -5.0 V R = 3k, V = 2.0V L IN Open Circuit Voltage -15 +15 V Short Circuit Current 100 mA V = 0V OUT Power Off Impedance 300 V = 0V, V = 2.0V CC OUT AC Characteristics Slew Rate 30 V/s R = 3k, C = 50pF V = +5.0V, T 25C L L CC A R = 3k, C = 2500pF between 3V, L L Transistion Time 1.5 s T +25C A Maximum Data Rate 120 235 kbps R = 3k, C = 2500pF L L Propagation Delay t 2 8 s PHL Measured from 1.5V of V to 50% of V IN OUT R = 3k L Propagation Delay t 2 8 s PLH RS-232 Receiver DC Characteristics HIGH Threshold 1.7 3.0 V LOW Threshold 0.8 1.2 V Receiver Open Circuit Bias +2.0 V Input Impedance 3 5 7 k V = +15V to -15V IN REV 1.0.1 2/13