SP332 RS-232/RS-485 Multi-Mode Serial Transceiver Description FEATURES The SP332 is a monolithic device that contains both RS-232 and 5V only single supply operation RS-485 line drivers and receivers. The configuration of the SP332 Software programmable RS-232 or RS-485 selection can be changed at any time by changing the logic state of two control 4 drivers, 4 receivers RS-232 pins. The device also includes a loop back function which internally 2 drivers, 2 receivers RS-485 connects driver outputs to receiver inputs for a chip self test. An Loop back function for self test MaxLinear-patented charge pump allows 5V-only operation. 28-pin WSOIC package Ordering Information - Back Page Typical Applications Circuit RS-232 Mode Full Duplex RS-485 Mode Mode 5V 5V 5 5 9 9 VCC 0.1F VCC 0.1F C1+ C1+ 0.1F 0.1F 12 10 12 10 V+ V+ C1- C1- 11 11 14 14 C2+ V+ C2+ V+ 0.1F 0.1F 13 13 SP332 0.1F SP332 0.1F C2- C2- 24 23 24 23 0V SEL A TTL/CMOS +5V SEL A TTL/CMOS LOOPBACK LOOPBACK V CC 2 2 0V SEL B +5V SEL B V CC 7 TX2 400K TX1 RS-485 26 TI1 400K 6 26 TI1 TTL/CMOS RS-232 T1 TTL/CMOS T1 TX1 6 V CC 27 TI2 RS-485 27 TX2 TI2 400K 7 TTL/CMOS TTL/CMOS RS-232 T2 V CC V CC 3 TX4 28 TI3 400K TX3 400K 4 RS-485 TTL/CMOS RS-232 T3 28 TI3 TTL/CMOS T3 V CC TX3 4 1 TI4 1 400K TX4 3 TI4 RS-485 TTL/CMOS TTL/CMOS T4 RS-232 19 RI1 RX1 15 RI12 16 TTL/CMOS RS-232 RS-485 R1 19 RX1 GND TTL/CMOS R1 GND 5K 150K RI1 15 20 RI2 16 20 RS-485 RX2 RX2 TTL/CMOS R2 RS-232 TTL/CMOS GND 150K GND 5K RI4 18 RI3 21 RX3 17 RS-485 TTL/CMOS RS-232 R3 21 RX3 GND TTL/CMOS R3 150K GND 5K RI3 17 22 RS-485 RX4 22 RI4 18 RX4 TTL/CMOS GND TTL/CMOS R4 RS-232 150K GND 5K 8 25 8 25 GND TTL/CMOS GND TTL/CMOS SHUTDOWN SHUTDOWN REV 1.0.1 1/11SP332 Absolute Maximum Ratings These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections to the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. V ..................................................................................7V Storage Temperature .................................. -65C to 150C CC Input Voltages Power Dissipation Logic ........................ -0.5V to (V + 0.5V) 28-pin WSOIC .............................1000mW CC Drivers ..................... -0.5V to (V + 0.5V) Power Derating, CC JA Receivers ........................30V 100mA 28-pin WSOIC ...............................40C/W 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 Parameters Min. Typ. Max. Units Conditions RS-485 Driver DC Characteristics Differential output voltage Vcc Volts Unloaded R = See Figure 1 Differential output voltage 2.0 5.0 Volts With load R = 50 (RS-422) See Figure 1 Differential output voltage 1.5 5.0 Volts With load R = 27 (RS-485) See Figure 1 Change in magnitude of driver differential 0.2 Volts R = 27 or R = 50 See Figure 1 output voltage for complementary states Driver common-mode output voltage 3 Volts R = 27 or R = 50 See Figure 1 Input high voltage 2.0 Volts Applies to transmitter inputs, SEL A, SEL B, SD and LB Input low voltage 0.8 Volts Applies to transmitter inputs, SEL A, SEL B, SD and LB Input current 10 A Applies to transmitter inputs, SEL A, SEL B, SD and LB Pull-up current 1.5 A Pull-down current 3.0 A Driver short circuit current V = HIGH 35 250 mA -7V V 10V OUT O Driver short circuit current V = LOW 35 250 mA -7V V 10V OUT O RS-485 Driver AC Characteristics Driver data rate 10 Mbps (1) Driver data rate 8 Mbps T = 85C A Driver input to output t 70 180 ns R = 54, C = C = 100pF see Figures 3 and 5 PLH DIFF L1 L2 Driver input to output t 70 180 ns R = 54, C = C = 100pF see Figures 3 and 5 PHL DIFF L1 L2 Driver skew 5 10 ns From output to output see Figures 3 and 5 From 10% to 90% R = 54, C = C = 100pF DIFF L1 L2 Driver rise or fall time 3 15 40 ns see Figures 3 and 5 REV 1.0.1 2/11