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SP3222EB/SP3232EB True +3.0V to +5.5V RS-232 Transceivers

SP3222EB/SP3232 EBTrue + to + RS-232 TransceiversThe SP3222EB/SP3232EB series is an RS-232 transceiver solution intended for portable or hand-held applications such as notebook or laptop computers. The SP3222EB/SP3232EB series has a high-effi ciency, charge-pump power supply that requires only F capacitors in operation. This charge pump allows the SP3222EB/SP3232EB series to deliver true RS-232 performance from a single power supply ranging from + to + The SP3222EB/SP3232EB are 2-driver/2-receiver devices. The ESD tolerance of the SP3222EB/SP3232EB devices is over +/-15kV for both Human Body Model and IEC61000-4-2 Air discharge test methods. The SP3222EB device has a low-power shutdown mode where the devices' driver outputs and charge pumps are disabled. During shutdown, the supply current falls to less than 1 Meets true EIA/TIA-232-F Standardsfrom a + to + power supply 250kbps Transmission Rate Under Load 1 A Low Power Shutdown with Receivers active (SP3222EB) Interoperable with RS-232 down to a + power source Enhanced ESD Specifi cations: +15kV Human Body Model+15kV IEC61000-4-2 Air Discharge+8kV IEC61000-4-2 Contact DischargeDESCRIPTIONSELECTION TABLED evice Power SuppliesRS-232 DriversRS-232 ReceiversExternal ComponentsShutdownTTL 3-State# of PinsSP3222EB+ to + CapacitorsYesYes18, 20SP3232EB+ t

Unless otherwise noted, the following performance characteristics apply for V CC = +3.3V, 1000kbps data rate, all drivers loaded with 3kΩ, 0.1µF charge pump capacitors, and T

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Transcription of SP3222EB/SP3232EB True +3.0V to +5.5V RS-232 Transceivers

1 SP3222EB/SP3232 EBTrue + to + RS-232 TransceiversThe SP3222EB/SP3232EB series is an RS-232 transceiver solution intended for portable or hand-held applications such as notebook or laptop computers. The SP3222EB/SP3232EB series has a high-effi ciency, charge-pump power supply that requires only F capacitors in operation. This charge pump allows the SP3222EB/SP3232EB series to deliver true RS-232 performance from a single power supply ranging from + to + The SP3222EB/SP3232EB are 2-driver/2-receiver devices. The ESD tolerance of the SP3222EB/SP3232EB devices is over +/-15kV for both Human Body Model and IEC61000-4-2 Air discharge test methods. The SP3222EB device has a low-power shutdown mode where the devices' driver outputs and charge pumps are disabled. During shutdown, the supply current falls to less than 1 Meets true EIA/TIA-232-F Standardsfrom a + to + power supply 250kbps Transmission Rate Under Load 1 A Low Power Shutdown with Receivers active (SP3222EB) Interoperable with RS-232 down to a + power source Enhanced ESD Specifi cations: +15kV Human Body Model+15kV IEC61000-4-2 Air Discharge+8kV IEC61000-4-2 Contact DischargeDESCRIPTIONSELECTION TABLED evice Power SuppliesRS-232 DriversRS-232 ReceiversExternal ComponentsShutdownTTL 3-State# of PinsSP3222EB+ to + CapacitorsYesYes18, 20SP3232EB+ to + CapacitorsNoNo16 Exar Corporation 48720 Kato Road, Fremont CA, 94538 510-668-7000 SP3222EB/SP3232EB_106_0223161 NOTE 1.

2 V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 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 specifi cations below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability and cause permanent damage to the to + + (NOTE 1).. to + (NOTE 1)..+ to + + |V-| (NOTE 1)..+13 VICC (DC VCC or GND current)..+100mAInput VoltagesTxIN, to + +25 VOutput + , .. to (VCC + )Short-Circuit C to +150 CUnless otherwise noted, the following specifi cations apply for VCC = + to + with TAMB = TMIN to TMAX,C1 - C4 = Dissipation per package20-pin SSOP (derate above +70oC)..750mW18-pin SOIC (derate above +70oC)..1260mW20-pin TSSOP (derate above +70oC)..890mW16-pin SSOP (derate above +70oC).

3 775mW16-pin Wide SOIC (derate above +70oC)..900mW16-pin TSSOP (derate above +70oC)..850mW16-pin nSOIC (derate above +70oC)..1086mWMaximum Junction Temperature ..+125 CThermal Resistance (16-pin TSSOP) JA .. C/WThermal Resistance (16-pin TSSOP) JC .. C/WThermal Resistance (16-pin QFN) JA .. C/WThermal Resistance (16-pin QFN) JC .. C/WELECTRICAL CHARACTERISTICSS upply load, VCC = ,TAMB = 25oC, TxIN = GND or VCCS hutdown Supply ASHDN = GND, VCC = ,TAMB = 25oC, TxIN = Vcc or GNDLOGIC INPUTS AND RECEIVER OUTPUTSI nput Logic Threshold , EN, SHDN, Note 2 Input Logic Threshold = , Note 2 Input Logic Threshold = , Note 2 Input Leakage Current+ + ATxIN, EN, SHDN,TAMB = +25oC, VIN = 0V to VCCO utput Leakage Current+ +10 AReceivers disabled, VOUT = 0V to VCCO utput Voltage = Voltage HIGHVCC = OUTPUTSO utput Voltage Swing + + driver outputs loaded with 3k to GND, TAMB = +25oCNOTE 2: Driver Input hysteresis is typically MAXIMUM RATINGS2 Exar Corporation 48720 Kato Road, Fremont CA, 94538 510-668-7000 SP3222EB/SP3232EB_106_022316 Unless otherwise noted, the following specifi cations apply for VCC = + to + with TAMB = TMIN to TMAX,C1 - C4 = F.

4 Typical values apply at VCC = + or + and TAMB = 25 UNITS CONDITIONSDRIVER OUTPUTS (continued)Output Resistance300 VCC = V+ = V- = 0V, VOUT=+2 VOutput Short-Circuit Current+35+60mAVOUT = 0 VOutput Leakage Current+25 AVCC = 0V or to , VOUT = +12V, Drivers disabledRECEIVER INPUTSI nput Voltage Range-1515 VInput Threshold = Threshold = Threshold = Threshold = Resistance357k TIMING CHARACTERISTICSM aximum Data Rate 250kbpsRL = 3k , CL = 1000pF, one driver activeReceiver Propagation Delay, tPHL sReceiver input to Receiver output, CL = 150pFReceiver Propagation Delay, sReceiver input to Receiver output, CL = 150pFReceiver Output Enable Time200nsReceiver Output Disable Time200nsDriver Skew100ns| tPHL - tPLH |, TAMB = 25 CReceiver Skew50ns| tPHL - tPLH |Transition-Region Slew Rate30V/ sVcc = , RL = 3k , CL = 1000pF, TAMB = 25 C, measurements taken from to + or + to Corporation 48720 Kato Road, Fremont CA.

5 94538 510-668-7000 SP3222EB/SP3232EB_106_0223163 Unless otherwise noted, the following performance characteristics apply for VCC = + , 1000kbps data rate, all drivers loaded with 3k , F charge pump capacitors, and TAMB = +25 2. Slew Rate vs Load CapacitanceFigure 1. Transmitter Output Voltage vs Load CapacitanceFigure 3. Supply Current VS. Load Capacitance when Transmitting DataFigure 5. Transmitter Output Voltage vs Supply VoltageFigure 4. Supply Current VS. Supply VoltageTYPICAL PERFORMANCE CHARACTERISTICS4 Exar Corporation 48720 Kato Road, Fremont CA, 94538 510-668-7000 SP3222EB/SP3232EB_106_022316 Table 1. Device Pin DescriptionNAME FUNCTIONPIN NUMBERSP3222 EBSP3232 EBSOICSSOPTSSOPSSOP TSSOP NSOIC WSOICQFNENR eceiver Enable. Apply Logic LOW for normal logic HIGH to disable the receiver outputs (high-Z state)11--C1+Positive terminal of the voltage doubler charge-pump capacitor22115V++ output generated by the charge pump33216C1-Negative terminal of the voltage doubler charge-pump capacitor4431C2+Positive terminal of the inverting charge-pump capacitor5542C2-Negative terminal of the inverting charge-pump output generated by the charge pump7764T1 OUTRS-232 driver driver receiver input14161311R2 INRS-232 receiver input9986R1 OUT TTL/CMOS receiver output13151210R2 OUT TTL/CMOS receiver output101097T1 INTTL/CMOS driver input1213119T2 INTTL/CMOS driver + to + supply voltage17191614 SHDNS hutdown Control Input.

6 Drive HIGH for normal device opera-tion. Drive LOW to shutdown the drivers (high-Z output) and the on-board power Connect-11, 14--PIN FUNCTIONExar Corporation 48720 Kato Road, Fremont CA, 94538 510-668-7000 SP3222EB/SP3232EB_106_0223165 Figure 7. Pinout Confi guration for the SP3232 EBFigure 6. Pinout Confi gurations for the SP3222 EBPINOUT6 Exar Corporation 48720 Kato Road, Fremont CA, 94538 510-668-7000 SP3222EB/SP3232EB_106_022316 Figure 8. SP3222EB Typical Operating CircuitsFigure 9. SP3232EB Typical Operating CircuitTYPICAL OPERATING CIRCUITSExar Corporation 48720 Kato Road, Fremont CA, 94538 510-668-7000 SP3222EB/SP3232EB_106_0223167 The SP3222EB/SP3232EB Transceivers meet the EIA/TIA-232 and ITU-T communication protocols and can be imple-mented in battery-powered, portable, or hand-held applications such as notebook or palmtop computers.

7 The SP3222EB/SP3232EB devices feature Exar's propri-etary on-board charge pump circuitry that generates for RS-232 voltage levels from a single + to + power supply. This series is ideal for + systems, mixed + to + systems, or + systems that require true RS-232 perfor-mance. The SP3222EB/SP3232EB devices can operate at a data rate of 250kbps when fully SP3222EB and SP3232EB are 2-driver/2- receiver devices ideal for portable or hand-held applications. The SP3222EB features a 1 A shutdown mode that reduces power consumption and extends battery life in portable systems. Its receivers remain active in shutdown mode, allowing external devices such as modems to be monitored using only 1 A supply OF OPERATIONThe SP3222EB/SP3232EB series is made up of three basic circuit blocks:1. Drivers2. Receivers3. The Exar proprietary charge pumpDriversThe 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.

8 Typically, the RS-232 output voltage swing is + with no load and +5V minimum fully loaded. The driver outputs are protected against infi nite short-circuits to ground with-out degradation in reliability. Driver outputs will meet EIA/TIA-562 levels of + with supply voltages as low as The drivers can guarantee a data rate of 250kbps fully loaded with 3k in parallel with 1000pF, ensuring compatability with PC-to-PC communication slew rate of the driver is internally limited to a maximum of 30V/ s in order to meet the EIA standards (EIA RS-232D , Para-graph 5). The transition of the loaded output from HIGH to LOW also meet the monotonic-ity requirements of the 10 shows a loopback test circuit used to test the RS-232 Drivers. Figure 11 shows the test results of the loopback circuit with all drivers active at 120kbps with RS-232 loads in parallel with a 1000pF capacitor.

9 Figure 12 shows the test results where one driver was active at 250kbps and all drivers loaded with an RS-232 receiver in parallel with 1000pF capacitors. A solid RS-232 data transmis-sion rate of 250kbps provides compatibility with many designs in personal computer peripherals and LAN SP3222EB driver's output stages are turned off (tri-state) when the device is in shutdown mode. When the power is off, the SP3222EB device permits the outputs to be driven up to +/-12V. The driver's inputs do not have pull-up resistors. Designers should connect unused inputs to Vcc or the shutdown mode, the supply current falls to less than 1 A, where SHDN = LOW. When the SP3222EB device is shut down, the device's driver outputs are disabled (tri-stated) and the charge pumps are turned off with V+ pulled down to Vcc and V- pulled to GND. The time required to exit shutdown is typically 100 s.

10 Connect SHDN to Vcc if the shutdown mode is not Corporation 48720 Kato Road, Fremont CA, 94538 510-668-7000 SP3222EB/SP3232EB_106_022316 ReceiversThe Receivers convert EIA/TIA-232 levels to TTL or CMOS logic output levels. The SP3222EB receivers have an inverting tri-state output. These receiver outputs (RxOUT) are tri-stated when the enable control EN = HIGH. In the shutdown mode, the receivers can be active or inactive. EN has no effect on TxOUT. The truth table logic of the SP3222EB driver and receiver outputs can be found in Table 2. Since receiver input is usually from a trans-mission line where long cable lengths and system interference can degrade the signal, the inputs have a typical hysteresis margin of 300mV. This ensures that the receiver is virtually immune to noisy transmission lines. Should an input be left unconnected, an internal 5k pulldown resistor to ground will commit the output of the receiver to a HIGH 2.


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