SP331

SP331 SIPEX | Alldatasheet

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Date: 03-04-05 Programmable Dual RS-232/RS-485 Transceiver © Copyright 2005 Sipex Corporation

FEATURES

■ +5V Only Operation ■ Software Programmable RS-232 or RS-485 Selection ■ Four RS-232 Transceivers in RS-232 Mode ■ Two RS-485 Full-Duplex Transceivers in RS-485 Mode ■ Two RS-232 Transceivers and One RS-485 Transceiver in Dual Mode ■ Self-Testing Loopback Mode ■ Full Driver Tri-State (Hi-Z) Control ■ Ideal for RS-232 to RS-485 conversion TI4 SEL_B TX4 TX3 VCC TX1 TX2 GND C1+ V+ (VDD) C2+ C1– C2– V– (VSS) TI3 TI2 TI1 SEL_C SEL_A SEL_D RX4 RX3 RX2 RX1 RI4 RI3 RI2 RI1 SP331 SP331 Programmable Dual RS-232/RS-485 Transceiver The SP331 is a programmable RS-232 and/or RS-485 transceiver IC. The SP331 contains four drivers and four receivers when selected in RS-232 mode; and two drivers and two receivers when selected in RS-485 mode. The SP331 also contains a dual mode which has two RS-232 drivers/receivers plus one differential RS-485 driver/receiver. The RS-232 transceivers can typically operate at 230kbps while adhering to the RS-232 specifications. The RS-485 transceivers can operate up to 10Mbps while adhering to the RS-485 specifications. The SP331 includes a self-test loopback mode where the driver outputs are internally configured to the receiver inputs. 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.

DESCRIPTION

0.1µF 0.1µF C1+ C1- C2+ C2- SEL B2 +5V VCC GND8 TTL/CMOS TTL/CMOS TTL/CMOS TTL/CMOS RS-485 RS-485 RS-485 0.1µF 0.1µF 0VSEL C RS-485 RS-485 RS-485 RI1 RI2 TX3 TX4 TX1 TX2 TI1 TI2 TI3 TI4 RX1 RX2 TTL/CMOS 21 R3 18RI4 RI3 RX3 RX4 15KΩ 15KΩ 15KΩ 15KΩ 400KΩ Vcc 400KΩ Vcc SEL D RS-485 RS-485 +5V +5V SP331 TYPICAL APPLICATION CIRCUITS Now Available in Lead Free Packaging

Date: 03-04-05 Programmable Dual RS-232/RS-485 Transceiver © Copyright 2005 Sipex Corporation

ELECTRICAL CHARACTERISTICS

Typically 25°C @ Vcc = +5V unless otherwise noted. MIN. TYP. MAX. UNITS CONDITIONS LOGIC INPUTS VIL 0.8 Volts VIH 2.0 Volts LOGIC OUTPUTS VOL 0.4 Volts I OUT= -3.2mA VOH 2.4 Volts I OUT= 1.0mA RS-232 DRIVER DC Characteristics HIGH Level Output +5.0 +15 Volts R L=3kΩ, VIN=0.8V LOW Level Output –15.0 –5.0 Volts R L=3kΩ, VIN=2.0V Open Circuit Voltage –15 +15 Volts Short Circuit Current ±100 mA V OUT = 0V Power Off Impedance 300 Ω Vcc = 0V, Vout = ±2.0V AC Characteristics Slew Rate 30 V/ µsR L=3kΩ, CL= 50pF VCC = +5.0V, TA @ +25°C Transition Time 1.5 µsR L=3kΩ, CL=2500pF ; between ±3V, TA @ +25°C Maximum Data Rate 120 235 kbps R L=3kΩ, CL=2500pF Propagation Delay t PHL 28 µs Measured from 1.5V of VIN tPLH 28 µs to 50% of VOUT; RL=3kΩ RS-232 RECEIVER DC Characteristics HIGH Threshold 1.7 3.0 Volts LOW Threshold 0.8 1.2 Volts Receiver Open Circuit Bias +2.0 Volts Input Impedance 3 5 7 k Ω V IN = +15V to –15V AC Characteristics Maximum Data Rate 120 235 kbps Propagation Delay t PHL 0.25 1 µs Measured from 50% of VIN tPLH 0.25 1 µs to 1.5V of VOUT. RS-485 DRIVER DC Characteristics Open Circuit Voltage 6.0 Volts Differential Output 1.5 5.0 Volts R L=54Ω, CL=50pF These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. V Power Dissipation Package Derating: 28-pin Plastic DIP ø 28-pin Plastic SOIC ABSOLUTE MAXIMUM RATINGS

Date: 03-04-05 Programmable Dual RS-232/RS-485 Transceiver © Copyright 2005 Sipex Corporation Typically 25°C @ Vcc = +5V unless otherwise noted. MIN. TYP. MAX. UNITS CONDITIONS RS-485 DRIVER Balance ±0.2 Volts |V T| - |VT| Common-Mode Output 3.0 Volts Output Current 28.0 mA R L=54Ω Short Circuit Current ±250 mA Terminated in –7V to +10V AC Characteristics Maximum Data Rate 10 Mbps R L=54Ω Output Transition Time 30 50 ns Rise/fall time, 10%–90% Propagation Delay See Figures 2 & 4 t PHL 80 120 ns R DIFF=54Ω, CL1=CL2=100pF tPLH 80 120 ns R DIFF=54Ω, CL1=CL2=100pF Driver Output Skew 10 20 ns per Figure 4, t SKEW = | tDPLH - tDPHL| RS-485 RECEIVER DC Characteristics Inputs Common Mode Range –7.0 +12.0 Volts Receiver Sensitivity ±0.2 ±0.3 Volts –7V ≤ V CM ≤ +12V Input Impedance 12 15 k Ω –7V ≤ VCM ≤ +12V AC Characteristics Maximum Data Rate 10 Mbps Propagation Delay See Figures 2 & 6 t PHL 130 200 ns R DIFF=54Ω, CL1=CL2=100pF tPLH 130 200 ns R DIFF=54Ω, CL1=CL2=100pF Differential Receiver Skew 10 20 ns t SKEW = | tPLH – tPHL |; RDIFF=54Ω, CL1=CL2=100pF ENABLE TIMING RS-485 Driver Enable Time See Figures 3 & 5 Enable to Low 90 150 ns C L=15pF, S1 Closed Enable to High 90 150 ns C L=15pF, S2 Closed Disable Time See Figures 3 & 5 Disable From Low 80 120 ns C L=15pF, S1 Closed Disable From High 80 120 ns C L=15pF, S2 Closed POWER REQUIREMENTS Supply Voltage VCC +4.75 +5.25 Volts Supply Current ICC No Load (Tx Disabled) 10 15 mA SEL_A ➨ SEL_D = "0001" No Load (RS-232 Mode) 15 30 mA SEL_A ➨ SEL_D = "0000" No Load (RS-485 Mode) 7 20 mA SEL_A ➨ SEL_D = "1100" ENVIRONMENTAL Operating Temperature Commercial (..C..) 0 +70 °C Industrial (..E..) –40 +85 °C Storage Temperature –65 +150 °C

Figure 2. Driver/Receiver Timing Test Circuit Figure 3. Driver Timing Test Load #2 Circuit Figure 1. Driver DC Test Load Circuit

1 Unit Load

Figure 7. Typical RS-232 Driver Output Figure 8. Typical RS-485 Driver Output

described in more detail below. shifting. A description of each phase follows. voltage potential across C 2 is l0V. Table 1. Mode Function Table. (Refer to Control Logic Confirmations for Block Diagrams)

Date: 03-04-05 Programmable Dual RS-232/RS-485 Transceiver © Copyright 2005 Sipex Corporation Drivers The SP331 has four independent RS-232 single- ended drivers and two differential RS-485 driv- ers. Control for the mode selection is done via a four–bit control word. The drivers are pre- arranged such that for each mode of operation the relative position and functionality of the drivers are set up to accommodate the selected interface mode. As the mode of the drivers is changed, the electrical characteristics will change to support the requirements of clock, data, and control line signal levels. Unused driver inputs can be left floating; however, to ensure a desired state with no input signal, pull–up resistors to +5V or pull–down resistors to ground are sug- gested. Since the driver inputs are both TTL or CMOS compatible, any value resistor less than 100kΩ will suffice. When in RS-232 mode, the single-ended RS- 232 drivers produce compliant RS-232E and ITU V.28 signals. Each of the four drivers output single-ended bipolar signals in access of ±5V with a full load of 3kΩ and 2500pF applied as specified. These drivers can also operate at least 120kbps. When programmed to RS-485 mode, the differ- ential RS-485 drivers produce complaint RS- 485 signals. Each RS-485 driver outputs a uni- polar signal on each output pin with a magnitude of at least 1.5V while loaded with a worst case of 54 Ω between the driver's two output pins. The signal levels and drive capability of the RS- 485 drivers allow the drivers to also comply with RS-422 levels. The transmission rate for the differential drivers is 10Mbps. Receivers The SP331 has four single-ended receivers when programmed for RS-232 mode and two differ- ential receivers when programmed for RS-485 mode. Control for the mode selection is done via a 4– bit control word, as in the drivers. As the oper- ating mode of the receivers is changed, the electrical characteristics will change to support the requirements of the appropriate serial stan- dard. Unused receiver inputs can be left floating without causing oscillation. To ensure a desired state of the receiver output, a pull–up resistor of 100kΩ to +5V should be connected to the in- verting input for a logic low, or the non–invert- ing input for a logic high. For single-ended receivers, a pull–down resistor to ground of 5kΩ is internally connected, which will ensure a logic high output. The RS-232 receiver has a single–ended input with a threshold of 0.8V to 2.4V. The RS-232 receiver has an operating voltage range of ±15V and can receive signals up to 120kbps. RS-232 receivers are used in RS-232 mode for all signal types include data, clock, and control lines of the RS-232 serial port. The differential RS-485 receiver has an input impedance of 15kΩ and a differential threshold of ±200mV. Since the characteristics of an RS- 422 receiver are actually subsets of RS-485, the receivers for RS-422 requirements are identical to the RS-485 receivers. All of the differential receivers can receive data up to 10Mbps. Select Mode Pins Similar to our SP500 family of multiprotocol products, the SP331 has the ability to change the configuration of the drivers and receivers via a 4–bit switch. Referring to Table 1 ; RS-232 mode, RS-485 mode, or two different combina- tions of RS-232/RS-485 can be configured us- ing the SEL_A and SEL_B pins. The drivers can be put into tri-state mode by using the SEL_C and SEL_D pins. All receivers remain active during any tri-state condition of the driv- ers. Loopback Mode Loopback is invoked by asserting "xx11" into the select pins. In RS-232/RS-485 or RS-485/ RS-232 loopback mode, the RS-232 driver out- puts loop back into the RS-232 receiver inputs and the RS-485 differential driver loops back into the RS-485 receiver. During loopback, the driver outputs and receiver inputs are discon- nected from the outside world. The driver outputs are in tri-state and the receiver inputs are disabled. The input impedance of the receivers during loopback is approximately 15k Ω to ground.

Date: 03-04-05 Programmable Dual RS-232/RS-485 Transceiver © Copyright 2005 Sipex Corporation SEL A 0 0 1 1 SEL B 0 1 0 1 SEL C 1 1 1 1 SEL D 1 1 1 1 SEL A SEL B SEL C SEL D 26 T1 6TX1TI1 7TX2 28 4TX3 3TX4 TI3 T3 15RI1 RX1 R1 16RI2 18RI4 17RI3

21 RX3 R3

28 TI3 T3

SP331 CONTROL LOGIC CONFIGURATION (Refer to Table 1) 26 T1 6TX1TI1 7TX2 15RI1 RX1 R1 16RI2 T4 TX4TI41 3 T3 TX3TI3 428 R3 RI3RX3 17 R4 RI4RX4 1822 26 T1 6TX1TI1 7TX2 28 4TX3 3TX4 TI3T3 19 15RI1RX1 R1 16RI2 18RI4 17RI321 RX3 R3 SP331 LOOPBACK (Refer to Table 1) 0 0 0 0 0 0 0 0 1 0 1 0 0 0 0 1 1 1 0 0 1 0 1 0 1 1 1 0 0 0 0 0 1 0 1 0 1 1 1 1 1 1 0 0 1 0 1 0

Date: 03-04-05 Programmable Dual RS-232/RS-485 Transceiver © Copyright 2005 Sipex Corporation D EH PACKAGE: 28-PIN PLASTIC SMALL OUTLINE (SOIC) DIMENSIONS (Inches) Minimum/Maximum (mm) A Ø LBe A B D E e H L Ø 28–PIN 0.093/0.104 (2.352/2.649) 0.004/0.012 (0.102/0.300) 0.013/0.020 (0.330/0.508) 0.698/0.706 (17.73/17.93) 0.291/0.299 (7.402/7.600)

0.050 BSC

(1.270 BSC) 0.394/0.419 (10.00/10.64) 0.016/0.050 (0.406/1.270) 0°/8° (0°/8°)

Date: 03-04-05 Programmable Dual RS-232/RS-485 Transceiver © Copyright 2005 Sipex Corporation

ORDERING INFORMATION

Model Temperature Range Package Types Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability aris ing out of the application or use of any product or circuit described hereing; neither does it convey any license under its patent rights nor the rights of others. Corporation SIGNAL PROCESSING EXCELLENCE Sipex Corporation Headquarters and Sales Office

22 Linnell Circle

Billerica, MA 01821 TEL: (978) 667-8700 FAX: (978) 670-9001 e-mail: sales@sipex.com Sales Office

233 South Hillview Drive

Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600 CLICK HERE TO ORDER SAMPLES /TR = Tape and Reel Pack quantity is 1,500 for WSIOC. Available in lead free packaging. To order add "-L" suffix to part number. Example: SP331ET/TR = standard; SP331ET-L/TR = lead free