SP334CT-L-TR EXAR | Alldatasheet

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Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP334_00_090909 The SP334 is a programmable RS-232 and/or RS-485 transceiver IC. The SP334 contains three drivers and five receivers when selected in RS-232 mode; and two drivers and two receivers when selected in RS-485 mode. The RS-232 transceivers can typically operate at 230kbps while adhering to the RS-232 specifications. The RS-485 transceivers can operate up to 0Mbps while adhering to the RS-485 specifications. The RS-485 drivers can be disabled (High-Z output) by the TXEN enable pin. The RS-232 and RS-485 receiver outputs can be disabled by the RXEN pin.

DESCRIPTION

  • +5V Single Supply Operation
  • Software Programmable RS-232 or RS-485 Selection
  • Three RS-232 Drivers and Five Receivers in RS-232 Mode
  • Two RS-485 Full-Duplex Transceivers in RS-485 Mode
  • Full Differential Driver Tri-State (Hi-Z) Control
  • Receiver Output Tri-State Control SP334 Programmable RS-232/RS-485 Transceiver TYPICAL APPLICATIONS CIRCUIT TTL/CMOS TTL/CMOS TTL/CMOS 0.1µF C1+ C1- C2+ C2- +5V VCC GND8 TTL/CMOS RS-485 RS-485 RS-485 +5VRS232/ RS485 RS-485 RS-485 RS-485 RI2 RI1 TX3 TX4 TX1 TX2 TI1 TI3 RX1 TTL/CMOS 21 R3 18RI4 RI3 RX3 RXEN 15KΩ 400KΩ Vcc 400KΩ Vcc RS-485 RS-485 SP334 15KΩ 15KΩ 15KΩ 0.1µF 0.1µF 0.1µF TXENTTL/CMOS TI3 TXEN(n/c) TX4(n/c) TX3 VCC TX1 TX2 GND C1+ C2+ C1– C2– TI2 TI1 RXEN RS232/RS485 RI5 RX5 RX4 RX3 RX2 RX1 RI4 RI3 RI2 RI1 SP334 (in RS-232 Mode)

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP334_00_090909 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 of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. Input Voltages SPECIFICATIONS Limits are specified at TA = 25°C and VCC = +5.0V unless otherwise noted. PARAMETER MIN. TYP. MAX. UNITS CONDITIONS Logic Inputs VIL 0.8 Volts VIH 2.0 Volts LOGIC OUTPUTS VOL 0.4 Volts IOUT = -3.2mA VOH 2.4 Volts IOUT = .0mA Output Tri-state Leakage 0 µA 0.4V ≤ VOUT ≤ +2.4V RS-232 DRIVER DC Characteristics HIGH Level Output +5.0 +5.0 Volts RL = 3kΩ, VIN = 0.8V LOW Level Output -5.0 -5.0 Volts RL = 3kΩ, VIN = 2.0V Open Circuit Voltage -5 +5 Volts Short Circuit Current +/-00 mA VOUT = 0V Power Off Impedance 300 Ω VCC = 0V, VOUT = +/-2.0V AC Characteristics Slew Rate 30 V/µs RL = 3kΩ, CL = 50pF; VCC = +5.0V, TA @ 25°C Transistion Time .56 µs RL = 3KΩ, CL = 2500pF; between +/-3V, TA @ +25°C Maximum Data Rate 20 235 kbps RL = 3kΩ, CL = 2500pF Propagation Delay tPHL 2 8 µs Measured from .5V of VIN to 50% of VOUT; RL = 3kΩ Propagation Delay tPLH 2 8 µs RS-232 RECEIVER DC Characteristics HIGH Threshold .7 3.0 Volts LOW Threshold 0.8 .2 Volts Receiver Open Circuit Bias +2.0 Volts Input Impedance 3 5 7 kΩ VIN = +5V to -5V Power Dissipation Package Derating: 28-pin WSOIC Note : Exceeding the maximum data rate of 8Mbps at TA = 85°C may permanently damage the device

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP334_00_090909 SPECIFICATIONS Limits are specifed at TA = 25°C and VCC = +5.0V unless otherwise PARAMETER MIN. TYP. MAX. UNITS CONDITIONS RS-232 RECEIVER (continued) AC Characteristics Maximum Data Rate 20 235 kbps Propagation Delay tPHL 0.25 µs Measured from 50% of VIN to .5V of VOUT Propagation Delay tPLH 0.25 µs RS-485 DRIVER DC Characteristics Open circuit Voltage 6.0 Volts Differential Output .5 5.0 Volts RL = 54Ω, CL = 50pF Balance +/-0.2 Volts |VT| - |VT| Common-Mode Output 3.0 Volts Output Current 28.0 mA RL = 54Ω Short Circuit Current +/-250 mA Terminated in -7V to +0V AC Characteristics Maximum Data Rate 0 Mbps RL = 54Ω Maximum Data Rate 8 Mbps RL = 54Ω, TA = +85°C, Note Output Transition Time 30 ns Rise/Fall time, 0%-90% Propagation Delay tPHL 80 20 ns See Figures 3 & 5, RDIFF = 54Ω, CL = CL2 = 00pFPropagation Delay tPLH 80 20 ns Driver Output Skew 5 20 ns Per Figure 5, tSKEW = |tDPHL - tDPLH| RS-485 RECEIVER DC Characteristics Common Mode Range -7.0 +2 Volts Receiver Sensitivity +/-0.2 Volts -7V ≤ VCM ≤ +12V Input Impedance 2 5 kΩ -7V ≤ VCM ≤ +12V AC Characteristics Maximum Data Rate 0 Mbps Maximum Data Rate 8 Mbps TA = +85°C, Note Propagation Delay tPHL 30 200 ns See Figures 3 & 7, RDIFF = 54Ω, CL = CL2 = 00pFPropagation Delay tPLH 30 200 ns Differential Receiver Skew 0 20 ns tSKEW = |tPHL - tPLH|, RDIFF = 54Ω, CL = CL2 = 00pF, see Figure 8 ENABLE TIMING RS-485 DRIVER Enable Time (see Figures 4 and 6) Enable to LOW 00 50 ns CL = 5pF, S Closed Enable to HIGH 00 50 ns CL = 5pF, S2 Closed Note : Exceeding the maximum data rate of 8Mbps at TA = 85°C may damage the device.

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP334_00_090909 SPECIFICATIONS Limits are specifed at TA = 25°C and VCC = +5.0V unless otherwise PARAMETER MIN. TYP. MAX. UNITS CONDITIONS RS-485 Driver Continued Disable Time (see Figures 4 and 6) Disable from LOW 00 20 ns CL = 5pF, S Closed Disable from HIGH 00 20 ns CL = 5pF, S2 Closed RS-485 RECEIVER Enable Time (see Figures 2 and 8) Enable to LOW 00 50 ns CL = 5pF, S Closed Enable to HIGH 00 50 ns CL = 5pF, S2 Closed Disable Time (see Figures 2 and 8) Disable from LOW 00 20 ns CL = 5pF, S Closed Disable from HIGH 00 20 ns CL = 5pF, S2 Closed POWER REQUIREMENTS Supply Voltage VCC +4.75 +5.25 Volts Supply Current ICC No Load (TX Disabled) 2 20 mA TXEN = 0V No Load (RS-232 Mode) 20 50 mA RS232/RS485 = 0V No Load (RS-485 Mode) 5 50 mA RS232/RS485 = +5V ENVIRONMENTAL Operating Temperature Commercial (_C_) 0 70 ºC Industrial (_E_) -40 +85 ºC Storage Temperature -65 +50 ºC

1 Unit Load

Figure 3. Driver/Receiver Timing Test Circuit Figure 4. Driver Timing Test Load #2 Circuit Figure 2. Receiver Timing Test Load Circuit

Figure 2. Typical Operating Circuit blocks is described in more detail below. compared to older less efficient designs. negative side is connected to ground.

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP334_00_090909 Drivers The SP334 has three independent RS-232 single-ended drivers and two differential RS- 485 drivers. Control for the mode selection is done by the RS232/RS485 select pin. The drivers are pre-arranged such that for each mode of operation the relative position and functionality of the drivers are set up to ac- commodate the selected interface mode. As the mode of the drivers is changed, the elec- trical 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 suggested. 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 three 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 20kbps. When programmed to RS-485 mode, the differential RS-485 drivers produce complaint RS-485 signals. Each RS-485 driver outputs a unipolar signal on each output pin with a magnitude of at least .5V while loaded with a worst case of 54Ω 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 0Mbps. Receivers The SP334 has five single-ended receivers when programmed for RS-232 mode and two differential receivers when programmed for RS-485 mode. Control for the mode selection is done by the same select pin as the drivers. As the operating mode of the receivers is changed, the electrical characteristics will change to support the requirements of the appropriate serial standard. 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 inverting input for a logic low, or the non–inverting input for a logic high. For single-ended receiv - ers, 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 ±5V and can receive signals up to 20kbps. 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 thresh- old of ±200mV. Since the characteristics of an RS-422 receiver are actually subsets of RS-485, the receivers for RS-422 require - ments are identical to the RS-485 receivers. All of the differential receivers can receive data up to 0Mbps. Enable Pins The SP334 drivers can be enabled by use of the TXEN pin. A logic HIGH will enable the driver outputs and a logic LOW will tri- state the outputs. The drivers can only be tri-stated in RS-485 mode. The drivers are always active in RS-232 mode. The Receiver outputs can also be tri-stated by the use of the RXEN pin. A logic LOW will enable the receiver outputs and a logic HIGH will tri-state the outputs. . The receiver tri-state capability is offered for both RS-232 and RS-485 modes. The input impedance of the receivers during tri-state is at least 12kΩ.

Applications

The SP334 allows the user flexibility in hav- ing a RS-232 or RS-485 serial port without using two different discrete active IC's. Figure 8 shows a connection to a standard DB-9 RS-232 connector. In RS-485 mode, the SP334 is a full duplex transceiver, however, a half duplex configuration can be made by connecting the driver outputs to receiver inputs.

Figure 18. SP334 Configuration to a DB-9 Serial Port

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP334_00_090909

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP334_00_090909

ORDERING INFORMATION

Model Temperature Range Package Types

REVISION HISTORy

2000 SP334/0 Legacy Sipex Datasheet

09/09/09 .0.0 Convert to Exar Format. Add typical application circuit to page and Revision History table. Remove EOL part numbers and update ordering information per PDN 0826-0. Change revision to .0.0. Add Maximum Data Rate to Absolute Maximum Ratings. Add RS-485 Driver and Receiver data rate column for 8Mbps maximum at Tmax and add Note . Notice EXAR Corporation reserves the right to make changes to any products contained in this publication in order to improve design, performance or reliabil- ity. EXAR Corporation assumes no representation that the circuits are free of patent infringement. Charts and schedules contained herein are only for illustration purposes and may vary depending upon a user's specific application. While the information in this publication has been carefully checked; no responsibility, however, is assumed for inaccuracies. EXAR Corporation does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless EXAR Corporation receives, in writting, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized ; (b) the user assumes all such risks; (c) potential liability of EXAR Corporation is adequately protected under the circumstances. Copyright 2009 EXAR Corporation Datasheet August 2009 Send your Interface technical inquiry with technical details to: uarttechsupport@exar.com Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited. Note: /TR = Tape and Reel

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