SP233A EXAR | Alldatasheet

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Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-7000 • Fax (50)668-707 • www.exar.com SP233A,30A,32A 00_05308

DESCRIPTION

FEATURES

SP233A,SP310A and SP312A Enhanced RS-232 Line Drivers/Receivers

  • Operates from a Single +5V Power Supply
  • Meets all RS-232F and ITU V.28 Specifications
  • Operates with 0.μF Ceramic Capacitors
  • No External Capacitors required (SP233A)
  • Low Power Shutdown (SP30A, SP32A)
  • High Data Rate - 20kbps under load
  • Low power CMOS Operation
  • +/-2kV Human Body Model ESD Protection
  • Lead Free packaging available The SP233A / SP30A / SP32A devices are a family of line driver and receiver pairs that meets the specifications of RS-232 and V.28 serial protocols. The devices are pin-to-pin compatible with popular industry standard pinouts. The SP233A / SP30A / SP32A offer 20kbps data rate under load, small ceramic type 0.μF charge pump capacitors and overall ruggedness for comercial appli- cations. Features include Exar's BiCMOS design allowing for low power operation without sacrificing performance. These devices are available in plastic DIP and SOIC Wide packages operating over the commercial and industrial temperature ranges. SELECTION TABLE Model Number of RS-232 No. of RX active in Shutdown No. of External 0.μF Capacitors Shutdown WakeUp TTL Tri-StateDrivers Receivers SP233A 2 2 N/A 0 No No No SP30A 2 2 0 4 Yes No Yes SP32A 2 2 2 4 Yes Yes Yes

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-7000 • Fax (50)668-707 • www.exar.com SP233A,30A,32A_00_05308 AbSoLUTE MAxiMUM RATingS These are stress ratings only and functional opera - tion of the device at these ratings or any other above those indicated in the operation sections of the speci- fications below are not implied. Exposure to absolute maximum ratings conditions for extended periods of time may affect reliability. Input Voltages Output Voltages Vcc=5V ±0%, 0.μF charge pump capacitors, Tmin to Tmax, unless otherwise noted, Typical values are Vcc=5V and Ta=25°C Short Circuit duration Package Power Dissipation: (derate 7mW/°C above +70°C) (derate 7mW/°C above +70°C)

ELECTRiCAL CHARACTERiSTiCS

PARAMETER TEST ConDiTionS Min TYP MAx UniT TTL inPUT Logic Threshold LOW Tin, En, SD, On/OFF 0.8 Volts Logic Threshold HIGH Tin, En, SD, On/OFF 2.0 Volts Logic Pull-Up Current Tin = 0V 5 200 μA TTL oUTPUT Output Voltge LOW iOuT = 3.2ma: Vcc = +5V 0.4 Volts Output Voltage HIGH iOuT = -1.0ma 3.5 Volts Leakage Current; Ta=25°C En = Vcc, 0V ≤ VOuT ≤ Vcc SP30A and SP32A only 0.05 +/-0 μA RS-232 oUTPUT Output Voltage Swing all Transmitter outputs loaded with 3k ohms to GND +/-5.0 +/-9V Volts Output Resistance Vcc = 0V, Vout = +/-2V 300 Ohms Output Short Circuit Current Infinite Duration +/-8 mA Maximum Data Rate CL = 2500pF, RL = 3kΩ 20 240 kbps RS-232 inPUT Voltage Range -25 +25 Volts Voltage Threshold LOW Vcc = 5V, Ta=25°C 0.8 .2 Volts Voltage Threshold HIGH Vcc = 5V, Ta=25°C .7 2.4 Volts Hysteresis Vcc = 5V, Ta=25°C 0.2 0.5 .0 Volts Resistance Ta=25°C, -25V ≤ Vin ≤ +25V 3 5 7 kΩ

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-7000 • Fax (50)668-707 • www.exar.com SP233A,30A,32A 00_05308 Parameter TEST CONDITIONS MIN TYP MAX Unit DYnAMiC CHARACTERiSTiCS Driver Propagation Delay TTL to RS_232; CL = 50pF .5 3.0 μs Receiver Propagation Delay RS-232 to TTL, 0. .0 μs Instantaneous Slew Rate CL = 10pF, RL = 3-7kΩ 30 V/ μs Transition Region Slew Rate CL = 2500pF, RL = 3kΩ; Measured from +3V to -3V or -3V to +3V

0 V/ μs

Output Enable Time SP30A and SP32A only 400 ns Output Disable Time SP30A and SP32A only 250 ns PoWER REQUiREMEnTS Vcc Power Supply Current No Load, Vcc = 5V, Ta=25°C 0 5 mA Vcc Power Supply Current, Loaded All Transmitters RL = 3kΩ, T a=25°C 25 mA Shutdown Supply Current SP30A and SP32A only Vcc = 5V, Ta=25°C 0 μA Vcc=5V ±0%, 0.μF charge pump capacitors, Tmin to Tmax, unless otherwise noted, Typical values are Vcc=5V and Ta=25°C Pin ASSignMEnTS 20 pin PDIP 20 pin WSOIC 8 pin PDIP / WSOIC 8 pin WSOIC

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-7000 • Fax (50)668-707 • www.exar.com SP233A,30A,32A_00_05308 The SP233A, SP30A and SP32A devices are a family of line driver and receiver pairs that meet the EIA/TIA-232 and V.28 serial commu- nication protocols. These devices are pin-to-pin compatible with popular industry standards. The SP233A, SP30A and SP32A devices offer a 20kbps data rate, 0V/μs slew rate and an on- board charge pump that operates from a single 5V supply using 0.μF ceramic capacitors. The ESD tolerance has been improved on these de- vices to +/-2kV Human Body Model. The SP233A device provides internal charge pump capacitors. The SP30A provides an ON/ OFF input that simultaneously disables the in - ternal charge pump circuit and puts all transmit- ter and receiver outputs into a high impedance state. The SP32A is identical to the SP30 but with seperate tri-state and shutdown inputs Theory of operation The SP233A, SP30A and SP32A devices are made up of three basic circuit blocks: . Drivers, 2. Receivers, and 3. charge pump. Drivers The drivers are inverting level transmitters that convert TTL or CMOS logic levels to EIA/TIA- 232 levels with an inverted sense relative to the input logic levels. Typically, the driver output voltage swing is +/-9V. Even under worst case loading conditions of 3kOhms and 2500pF, the driver output is guaranteed to be +/-5.0V mini - mum, thus satisfying the RS-232 specification. The driver outputs are protected against infinite short-circuits to ground without degradation in reliability. The drivers can guarantee output data rates of 20kbps under worst case loading of 3k ohms and 2500pF. The Slew rate of the driver output is internally limited to 30V/ μs in order to meet the EIA stan- dards (EIA-232F). Additionally, the driver out- puts LOW to HIGH transition meets the mon - tonic output requirements of the standard. Receivers The receivers convert EIA/TIA-232 signal levels to TTL or CMOS logic output levels. Since the input is usually from a transmission line, where long cable length and system interference can degrade the signal, the inputs have a typical hysteresis margin of 500mV. This ensures that the receiver is virtually immune to noisy trans - mission lines. Should an input be left uncon - nected, an internal 5kohm pull-down resistor to ground will commit the output of the receiver to a HIGH state. Charge pump The charge pump is a patented design and uses a unique approach compared to older less efficiant designs. The charge pump re- quires 4 external capacitors and uses a four phase voltage shifting technique. The internal power supply consists of a dual charge pump that provides a driver output voltage swing of +/-9V. The internal oscillator controls the four phases of the voltage shifting. A description of each phase follows: Phase 1 Vss charge store and double: The positive ter- minals of capacitors C and C2 are charged from Vcc with their negative terminals initially connected to ground. C+ is then connected to ground and the stored charge from C- is superimposed onto C2-. Since C2+ is still con- nected to Vcc the voltage potential across C2 is now 2 x Vcc. Phase 2 Vss transfer and invert: Phase two connects the negative terminal of C2 to the Vss storage capacitor and the positive terminal of C2 to ground. This transfers the doubled and inverted (V-) voltage onto C4. Meanwhile, capacitor C is charged from Vcc to prepare it for its next phase. Phase 3 Vdd charge store and double: Phase three is identical to the first phase. The positive termi - nals of C and C2 are charged from Vcc with their negative terminals initially connected to ground. C+ is then connected to ground and the stored charge from C- is superimposed onto C2-. Since C2+ is still connected to Vcc the voltage potential across capacitor C2 is now 2 x Vcc.

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-7000 • Fax (50)668-707 • www.exar.com SP233A,30A,32A 00_05308 Vdd transfer: The fourth phase connects the negative terminal of C2 to ground and the posi- tive terminal of C2 to the Vdd storage capacitor. This transfers the doubled (V+) voltage onto C3. Meanwhile, capacitor C is charged from Vcc to prepare it for its next phase. The clock rate for the charge pump typically op- erates at greater than 5kHz allowing the pump to run efficiently with small 0.1uF capacitors. Ef- ficient operation depends on rapid charging and discharging of C and C2, therefore capacitors should be mounted as close as possible to the IC and have low ESR (equivalent series resis - tance). Inexpensive surface mount, ceramic ca- pacitors are ideal for using on charge pump. If polarized capacitors are used the positive and negative terminals should be connected as shown in the typical operating circuit. A diagram of the individual phases are shown in Figure . Shutdown (SD) and Enable (En) features for the SP310A and SP312A Both the SP30A and SP32A have a shutdown / standby mode to conserve power in battery- powered applications. To activate the shutdown mode, which stops the operation of the charge pump, a logic "0" is applied to the appropriate control line. For the SP30A, this control line is the ON/OFF (pin 8) input. Activating the shut - down mode puts the SP30A transmitter and re- ceiver ouptuts into a high impedance condition. For the SP32A, this control line is the SHUT - DOWN (pin8) input; this also puts the transmit- ter outputs in a tri-state mode. The receiver out- puts can be tri-stated seperately during normal operation or shutdown by applying a logic "" on the EN line (pin ). Wake-Up Feature for the SP312A The SP32A has a wake-up feature that keeps the receivers active when the device is placed into shutdown. Table 1 defines the truth table for the Wake-Up function. When only the receivers are activated, the SP32A typically draws less than 5uA supply current. In the case of when a modem is interfaced to a computer in power down mode, the Ring Indicator (RI) signal from the modem would be used to "wake-up" the computer, allowing it to accept data transmis- sion. After the ring indicator has propagated through the SP32A receiver, it can be used to trigger the power management circuitry of the computer to power up the microproces- sor, and bring the SD pin of the SP32A to a logic high, taking it out of the shutdown mode. The receiver propagation delay is typically us. The enable time for V+ and V- is typi- cally 2ms. After V+ and V- have settled to their final values, a signal can be sent back to the modem on the data terminal ready (DTR) pin signifying that the computer is ready to accept the transmit data. SD EN Power Up/Down Receiver outputs 0 0 Down Enabled Down Tri-state

0 Up Enabled

Table . Wake-up Function truth table Pin Strapping for the SP233ACT/ACP The SP233A packaged in a 20 pin SOICW package (SP233ACT) has a slightly different pinout than the SP233A in PDIP packaging (SP233ACP). To operate properly, the fol- lowing pairs of pins must be externally wired together as noted in table 2: Pins Wired Together SOICW PDIP Two V- pins 0 & 7 2 & 7 Two C2+ pins 2 & 5 & 5 Two C- pins & 6 0 & 6 No Connections for Pins 8, 3 and 4 Connect Pins 6 and 9 to GND Table 2. Pin Strapping table for SP233A

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-7000 • Fax (50)668-707 • www.exar.com SP233A,30A,32A_00_05308 C 2 V CC C 3 C 4 C 1 + + e - e - Phases 1 and 3: Store/Double. Double charge from C 1 onto C2. C 2 is now charged to -2xVcc C 2 V CC C 3 C 4 C 1 + + e - + e + e + C 2 V CC C 3 C 4 C 1 + + Phase 2 – Vss transfer from C2 to C4. Meanwhile C 1 is charged to Vcc e - e - e - Vss transfer from C2 to C3. Meanwhile C1 is charged to Vcc V DD Patented 5,306,954 Phase 4 VDD Figure . Charge pump phases

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-7000 • Fax (50)668-707 • www.exar.com SP233A,30A,32A 00_05308

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-7000 • Fax (50)668-707 • www.exar.com SP233A,30A,32A_00_05308

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-7000 • Fax (50)668-707 • www.exar.com SP233A,30A,32A 00_05308

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-7000 • Fax (50)668-707 • www.exar.com SP233A,30A,32A_00_05308

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-7000 • Fax (50)668-707 • www.exar.com SP233A,30A,32A 00_05308 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 ef fectiveness. 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 2008 EXAR Corporation Datasheet May 2008 Send your Interface technical inquiry with technical details to: customersupport@exar.com Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited.

ORDERING INFORMATION

Part number LEAD FREE Tape & Reel Temperature range Package Type SP233ACP -L From 0 to +700C 20 pin PDIP SP233AEP -L From -40 to +850C 20 pin PDIP SP233ACT -L /TR From 0 to +700C 20 pin SOICW SP233AET -L /TR From -40 to +850C 20 pin SOICW SP30ACP -L From 0 to +700C 8 pin PDIP SP30ACT -L /TR From 0 to +700C 8 pin SOICW SP30AET -L /TR From -40 to +850C 8 pin SOICW SP32ACT -L /TR From 0 to +700C 8 pin SOICW SP32AET -L /TR From -40 to +850C 8 pin SOICW All packages are available as lead free (RoHS compliant). To order add “-L” suffix to part number. For Tape and Reel add “/TR”. Reel quantity is ,500 for SOICW. Example: SP233ACT-L/TR = lead free and Tape and Reel. SP233ACT/TR = standard with Tape and Reel.