SP3221E

SP3221E Intelligent +3.0V to +5.5V RS-232 Transceiver ■ Meets true EIA/TIA-232-F Standards from a +3.0V to +5.5V power supply ■ Operates with EIA/TIA-232 and adheres to EIA/TIA-562 down to a +2.7V power source ■ Auto-Online™ circuitry allows 1µA supply current when in shutdown ■ 240kbps data rate under load ■ 6V/µs minimum slew rate ■ The SP3221 is the industries smallest single-supply RS-232 transceiver package ■ Enhanced ESD Specifications: +15KV Human Body Model +15KV IEC1000-4-2 Air Discharge +8KV IEC1000-4-2 Contact Discharge EN 1 16 SHUTDOWN 15 VCC 14 GND SP3221 13 12 T1OUT ONLINE C1+ 2 V+ C1C2+ C2VR1IN 3 4 5 6 7 8 11 T1IN 10 9 STATUS R1OUT Now Available in Lead Free Packaging DESCRIPTION The SP3221E is a RS-232 transceiver solution intended for portable or hand-held applications such as notebook and palmtop computers. The SP3221E has a high-efficiency, charge-pump power supply that requires only 0.1µF capacitors in 3.3V operation. This charge pump and low dropout transmitters allow the SP3221E device to deliver true RS-232 performance from a single power supply ranging from +3.3V to +5.0V. The Auto-Online feature allows the device to automatically "wake-up" during a shutdown state when an RS-232 cable is connected . Otherwise, the device automatically shuts itself down drawing less than 1µA. SELECTION TABLE Device SP3221E SP3220E Power Supplies +3.0V to +5.5V +3.0V to +5.5V RS-232 Drivers 1 1 RS-232 Receivers 1 1 External Components 4 (0.1µF) capacitors 4 (0.1µF) capacitors Auto-Online Circuitry YES NO TTL 3-State YES YES No. of Pins 16 16 Applicable U.S. Patents - 5,306,954; and other patents pending. Date: 7/21/04 SP3221E +3.0V to +5.5V RS-232 Transceiver © Copyright 2004 Sipex Corporation 1 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 and cause permanent damage to the device. VCC.......................................................-0.3V to +6.0V V+ (NOTE 1)........................................-0.3V to +7.0V V- (NOTE 1).........................................+0.3V to -7.0V V+ + |V-| (NOTE 1)............................................+13V ICC (DC VCC or GND current)..........................+100mA Input Voltages TxIN, ONLINE, SHUTDOWN, EN .................................-0.3V to +6.0V RxIN....................................................................+15V Output Voltages TxOUT.................................................................+15V RxOUT, STATUS..................-0.3V to (VCC + 0.3V) Short-Circuit Duration TxOUT.......................................................Continuous Storage Temperature........................-65°C to +150°C Power Dissipation per package 16-pin PDIP (derate 14.3mW/oC above+70oC).....1150mW 16-pin SSOP (derate 9.69mW/oC above +70oC)....775mW NOTE 1: V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V. SPECIFICATIONS Unless otherwise noted, the following specifications apply for VCC = +3.0V to +5.5V with TAMB = TMIN to TMAX. Typical values apply at VCC = +3.3V or +5.0V and TAMB = 25°C. PARAMETER DC CHARACTERISTICS Supply Current, Auto-Online 1.0 10 µA All RxIN open, ONLINE = GND, SHUTDOWN = VCC, VCC = +3.3V, TAMB = +25° C SHUTDOWN = GND, VCC = +3.3V, TAMB = +25° C ONLINE = SHUTDOWN = VCC, no load, VCC = +3.3V, TAMB = +25° C MIN. TYP. MAX. UNITS CONDITIONS Supply Current, Shutdown Supply Current, Auto-Online Disabled LOGIC INPUTS AND RECEIVER OUTPUTS Input Logic Threshold LOW HIGH Input Leakage Current Output Leakage Current Output Voltage LOW Output Voltage HIGH VCC - 0.6 1.0 0.3 10 1.0 µA mA 0.8 2.0 ±0.01 ±0.05 ±1.0 ±10 0.4 VCC - 0.1 V µA µA V V VCC = +3.3V or +5.0V, TxIN, EN, ONLINE, SHUTDOWN TxIN, EN, ONLINE, SHUTDOWN, TAMB = +25° C Receivers disabled IOUT = 1.6mA IOUT = -1.0mA Date: 7/21/04 SP3221E +3.0V to +5.5V RS-232 Transceiver © Copyright 2004 Sipex Corporation 2 Unless otherwise noted, the following specifications apply for VCC = +3.0V to +5.5V with TAMB = TMIN to TMAX. Typical values apply at VCC = +3.3V or +5.0V and TAMB = 25°C. PARAMETER DRIVER OUTPUTS Output Voltage Swing Output Resistance Output Short-Circuit Current Output Leakage Current ± 5.0 30 0 ± 35 ± 70 ± 60 ± 100 ± 25 ± 5. 4 V Ω mA µA All driver outputs loaded with 3KΩ to GND, TAMB = +25° C VCC = V+ = V- = 0V, VOUT = ± 2V VOUT = 0V VOUT = ± 15V VCC = 0V or 3.0V to 5.5V, VOUT = ± 12V, Drivers disabled MIN. TYP. MAX. UNITS CONDITIONS SPECIFICATIONS (continued) RECEIVER INPUTS Input Voltage Range Input Threshold LOW Input Threshold LOW Input Threshold HIGH Input Threshold HIGH Input Hysteresis Input Resistance 3 -15 0.6 0. 8 1.2 1.5 1. 5 1. 8 0. 3 5 7 2.4 2.4 15 V V V V V V kΩ VCC = 3.3V VCC = 5.0V VCC = 3.3V VCC = 5.0V Auto-Online CIRCUITRY CHARACTERISTICS (ONLINE = GND, SHUTDOWN = VCC) STATUS Output Voltage LOW STATUS Output Voltage HIGH Receiver Threshold to Drivers Enabled (tONLINE) Receiver Positive or Negative Threshold to STATUS HIGH (tSTSH) Receiver Positive or Negative Threshold to STATUS LOW (tSTSL) VCC - 0.6 200 0.5 0.4 V V µS µS IOUT = 1.6mA IOUT = -1.0mA Figure 15 Figure 15 20 µS Figure 15 Date: 7/21/04 SP3221E +3.0V to +5.5V RS-232 Transceiver © Copyright 2004 Sipex Corporation 3 SPECIFICATIONS (continued) Unless otherwise noted, the following specifications apply for VCC = +3.0V to +5.5V with TAMB = TMIN to TMAX. Typical values apply at VCC = +3.3V or +5.0V and TAMB = 25°C. PARAMETER TIMING CHARACTERISTICS Maximum Data Rate Receiver Propagation Delay tPHL tPLH Receiver Output Enable Time Receiver Output Disable Time Driver Skew Receiver Skew Transition-Region Slew Rate 120 240 kbps µs ns ns 500 1000 30 ns ns V/µs RL = 3KΩ, CL = 1000pF, one driver active Receiver input to Receiver output, CL = 150pF Normal operation Normal operation | tPHL - tPLH |, TAMB = 25oC | tPHL - tPLH | VCC= 3.3V, RL = 3KΩ, TAMB = 25oC, measurements taken from -3.0V to +3.0V or +3.0V to -3.0V MIN. TYP. MAX. UNITS CONDITIONS 0.3 0.3 200 200 100 200 TYPICAL PERFORMANCE CHARACTERISTICS Unless otherwise noted, the following performance characteristics apply for VCC = +3.3V, 235Kbps data rate, all drivers loaded with 3KΩ, 0.1µF charge pump capacitors, and TAMB = +25°C. 6 Transmitter Output Voltage [V] 14 12 10 4 2 0 0 -2 -4 -6 Load Capacitance [pF] 500 1000 1500 Slew Rate [V/µs] Vout+ Vout- 8 6 4 2 0 0 500 1000 1500 Load Capacitance [pF] 2000 +Slew -Slew Figure 1. Transmitter Output Voltage VS. Load Capacitance 40 35 30 25 20 15 10 5 0 0 500 1000 1500 Load Capacitance [pF] 2000 118KHz 60KHz 10KHz Figure 2. Slew Rate VS. Load Capacitance Figure 3. Supply Current VS. Load Capacitance when Transmitting Data Date: 7/21/04 SP3221E +3.0V to +5.5V RS-232 Transceiver © Copyright 2004 Sipex Corporation Supply Current [mA] 4 NAME EN FUNCTION Receiver Enable. Apply logic HIGH for normal operation. Apply logic LOW to disable the receiver outputs (high-Z state). Positive terminal of the voltage doubler charge-pump capacitor. Regulated +5.5V output generated by the charge pump. Negative terminal of the voltage doubler charge-pump capacitor. Positive terminal of the inverting charge-pump capacitor. Negative terminal of the inverting charge-pump capacitor. Regulated -5.5V output generated by the charge pump. RS-232 receiver input. TTL/CMOS receiver output. TTL/CMOS Output indicating ONLINE and SHUTDOWN status. TTL/CMOS driver input. Apply logic HIGH to override Auto-Online circuitry keeping drivers active (SHUTDOWN must also be logic HIGH, refer to Table 2). RS-232 driver output. Ground. +3.0V to +5.5V supply voltage. PIN NO. 1 C1+ V+ C1C2+ C2VR1IN R1OUT STATUS T1IN ONLINE 2 3 4 5 6 7 8 9 10 11 12 T1OUT GND VCC 13 14 15 Apply logic LOW to shut down drivers and charge pump. SHUTDOWN This overrides all Auto-Online circuitry and ONLINE (refer to Table 2). Table 1. Device Pin Description 16 Date: 7/21/04 SP3221E +3.0V to +5.5V RS-232 Transceiver © Copyright 2004 Sipex Corporation 5 EN 1 16 SHUTDOWN 15 VCC 14 GND SP3221 13 12 T1OUT ONLINE C1+ 2 V+ C1C2+ C2VR1IN 3 4 5 6 7 8 11 T1IN 10 9 STATUS R1OUT Figure 4. SP32221E Pinout Configuration VCC 0.1µF 2 C1+ 0.1µF 4 C15 C2+ C2 + 0.1µF 6 C211 T1IN 9 R1OUT 5KΩ 1 EN 12 ONLINE VCC TO POWER MANAGEMENT UNIT 16 SHUTDOWN GND 14 T1OUT 13 R1IN 15 VCC V+ 3 C3 + 0.1µF C5 + C1 + SP3221 V- 7 C4 + 0.1µF TTL/CMOS INPUTS TTL/CMOS OUTPUTS RS-232 OUTPUTS RS-232 INPUTS 8 10 STATUS Figure 5. SP3221E Typical Operating Circuit Date: 7/21/04 SP3221E +3.0V to +5.5V RS-232 Transceiver © Copyright 2004 Sipex Corporation 6 DESCRIPTION The S P3221E t ransceiver meets the EIA/ TIA-232 and ITU-T V.28/V.24 communication protocols and can be implemented in batterypowered, portable, or hand-held applications such as notebook or hand held computers. The SP3221E device features Sipex's proprietary and patented (U.S.-- 5,306,954) on-board charge pump circuitry that generates ±5.5V RS-232 voltage levels from a single +3.0V to +5.5V power supply. The SP3221E device can operate at a typical data rate of 240Kbps fully loaded. The SP3221E is a 1-driver/1-receiver device is ideal for portable or hand-held applications and power sensitive designs. The device features Auto-Online circuitry which reduces the power supply drain to a 1µA supply current. In many portable or hand-held applications, an RS-232 cable can be disconnected when not in use. Under these conditions, the internal charge pump and the driver will be shut down. Otherwise, the device automatically comes online. This feature allows design engineers to address power saving concerns without major design changes. THEORY OF OPERATION The SP3221E device is made up of four basic circuit blocks: 1. Drivers, 2. Receivers, 3. the Sipex proprietary charge pump, and 4. Auto-Online circuitry. Drivers The driver is inverting level transmitters that convert TTL or CMOS logic levels to 5.0V EIA/ TIA-232 levels with an inverted sense relative to the input logic levels. Typically, the RS-232 output voltage swing is +5.4V with no load and +5V minimum fully loaded. The driver outputs are protected against infinite short-circuits to ground without degradation in reliability. This driver complies with the EIA-TIA-232F and all previous RS-232 versions. The driver typically can operate at a data rate of 250Kbps. The driver can guarantee a data rate of 250Kbps fully loaded with 3K Ω i n parallel with 1000pF, ensuring compatibility with PC-to-PC communication software. The slew rate of the driver output is internally limited to a maximum of 30V/µs in order to meet the EIA standards (EIA RS-232D 2.1.7, Paragraph 5). The transition of the loaded output from HIGH to LOW also meets the monotonicity requirements of the standard. The SP3221E driver can maintain high data rates up to 240Kbps fully loaded. Figure 6 shows a loopback test circuit used to test the RS-232 drivers. Figure 7 shows the test results of the loopback circuit with the driver active at 250Kbps with typical RS-232 loads in parallel with 1000pF capacitors. Figure 8 shows the test results where the loaded driver was active at 235Kbps with an RS-232 receiver in parallel with a 1000pF capacitor. A solid RS-232 data transmission rate of 250Kbps provides compatibility with many designs in personal computer peripherals and LAN applications. Date: 7/21/04 SP3221E +3.0V to +5.5V RS-232 Transceiver © Copyright 2004 Sipex Corporation 7 DEVICE: SP3221E SHUTDOWN 0 0 1 1 EN 0 1 0 1 TXOUT High Z High Z Active Active RXOUT Active High Z Active High Z C5 + 0.1µF 2 C1+ 0.1µF 4 C15 C2+ C2 + 0.1µF 6 C211 T1IN +3V to +5V 19 VCC V+ 3 C3 + 0.1µF C1 + SP3221E V- 7 C4 + 0.1µF TTL/CMOS INPUTS TTL/CMOS OUTPUTS T1OUT 13 9 R1OUT 5KΩ 1 EN 20 14 SHUTDOWN ONLINE STATUS GND 18 R1IN 8 1000pF Table 2. SHUTDOWN and EN Truth Tables Note: In Auto-Online Mode where ONLINE = GND and SHUTDOWN = VCC, the device will shut down if there is no activity present at the Receiver inputs. VCC To µP Supervisor Circuit 11 Receivers The receiver converts ±5.0V EIA/TIA-232 levels to TTL or CMOS logic output levels. The receiver has an inverting output that can be disabled by using the EN pin. The receiver is active when the Auto-Online circuitry is enabled or when in shutdown. During the shutdown, the receiver will continue to be active. Figure 6. Loopback Test Circuit for RS-232 Driver Data Transmission Rates Driving EN to a logic HIGH forces the output of the receiver into high-impedance. Since receiver input is usually from a transmission 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 5KΩ pulldown resistor to ground will commit the output of the receiver to a HIGH state. [ T ] [ T ] T1 IN 1 T T1 IN 1 T T1 OUT 2 T T R1 OUT 3 Ch1 5.00V Ch3 5.00V Ch2 5.00V M 5.00µs Ch1 0V T1 OUT 2 T T R1 OUT 3 Ch1 5.00V Ch3 5.00V Ch2 5.00V M 2.50µs Ch1 0V Figure 7. Loopback Test Circuit Result at 250Kbps (Driver Fully Loaded) Date: 7/21/04 Figure 8. Loopback Test Circuit result at 235Kbps (Driver Fully Loaded) © Copyright 2004 Sipex Corporation SP3221E +3.0V to +5.5V RS-232 Transceiver 8 Charge Pump The charge pump is a Sipex–patented design (U.S. 5,306,954) and uses a unique approach compared to older less–efficient designs. The charge pump still requires four external capacitors, but uses a four–phase voltage shifting technique to attain symmetrical 5.5V power supplies. The internal power supply consists of a regulated dual charge pump that provides output voltages 5.5V regardless of the input voltage (VCC) over the +3.0V to +5.5V range. This is important to maintain compliant RS-232 levels regardless of power supply fluctuations. The charge pump operates in a discontinuous mode using an internal oscillator. If the output voltages are less than a magnitude of 5.5V, the charge pump is enabled. If the output voltages exceed a magnitude of 5.5V, the charge pump is disabled. This oscillator controls the four phases of the voltage shifting. A description of each phase follows. Phase 1 — VSS charge storage — During this phase of the clock cycle, the positive side of capacitors C1 and C2 are initially charged to VCC. Cl+ is then switched to GND and the charge in C1– is transferred to C2–. Since C2+ is connected to VCC, the voltage potential across capacitor C2 is now 2 times VCC. Phase 2 — VSS transfer — Phase two of the clock connects the negative terminal of C2 to the VSS storage capacitor and the positive terminal of C2 to GND. This transfers a negative generated voltage to C 3. This generated voltage is regulated to a minimum voltage of -5.5V. Simultaneous with the transfer of the voltage to C3, the positive side of capacitor C1 is switched to VCC and the negative side is connected to GND. Phase 3 — VDD charge storage — The third phase of the clock is identical to the first phase — the charge transferred in C1 produces –VCC in the negative terminal of C1, which is applied to the negative side of capacitor C2. Since C2+ is at VCC, the voltage potential across C2 is 2 times VCC. Phase 4 — VDD transfer — The fourth phase of the clock connects the negative terminal of C2 to GND, and transfers this positive generated voltage across C2 to C4, the VDD storage capacitor. This voltage is regulated to +5.5V. At this voltage, the internal oscillator is disabled. Simultaneous with the transfer of the voltage to C4, the positive side of capacitor C1 is switched to VCC and the negative side is connected to GND, allowing the charge pump cycle to begin again. The charge pump cycle will continue as long as the operational conditions for the internal oscillator are present. Since both V+ and V– are separately generated from VCC, in a no–load condition V+ and V– will be symmetrical. Older charge pump approaches that generate V– from V+ will show a decrease in the magnitude of V– compared to V+ due to the inherent inefficiencies in the design. The clock rate for the charge pump typically operates at 250kHz. The external capacitors can be as low as 0.1µF with a 16V breakdown voltage rating. Date: 7/21/04 SP3221E +3.0V to +5.5V RS-232 Transceiver © Copyright 2004 Sipex Corporation 9 RECEIVER +2.7V 0V RS-232 INPUT VOLTAGES -2.7V VCC STATUS 0V S H U T D O W N tSTSL tSTSH tONLINE +5V DRIVER RS-232 OUTPUT VOLTAGES 0V -5V Figure 9. Auto-Online Timing Waveforms VCC = +5V +5V C1 + – C4 + – + C2 + – – VDD Storage Capacitor VSS Storage Capacitor –5V –5V C3 Figure 10. Charge Pump — Phase 1 VCC = +5V C4 + – + C1 + – C2 + – – VDD Storage Capacitor VSS Storage Capacitor –10V C3 Figure 11. Charge Pump — Phase 2 Date: 7/21/04 SP3221E +3.0V to +5.5V RS-232 Transceiver © Copyright 2004 Sipex Corporation 10 [ T ] +6V a) C2+ 1 2 2 T 0V 0V b) C2T -6V Ch1 2.00V Ch2 2.00V M 1.00µs Ch1 1.96V Figure 12. Charge Pump Waveforms VCC = +5V +5V C1 + – C4 + – + C2 + – – VDD Storage Capacitor VSS Storage Capacitor –5V –5V C3 Figure 13. Charge Pump — Phase 3 VCC = +5V +10V C1 + – C4 + – + C2 + – – VDD Storage Capacitor VSS Storage Capacitor C3 Figure 14. Charge Pump — Phase 4 Date: 7/21/04 SP3221E +3.0V to +5.5V RS-232 Transceiver © Copyright 2004 Sipex Corporation 11 RS-232 Cable Connected? SHUTDOWN INPUT ONLINE INPUT STATUS OUTPUT TRANSCEIVER STATUS Normal Operation Normal Operation Shutdown (Auto-Online) Shutdown Shutdown TxOUT Active Active HiZ HiZ HiZ YES NO NO YES NO HIGH HIGH HIGH LOW LOW HIGH LOW - HIGH LOW LOW HIGH LOW Table 3. Auto-Online Logic NOTE: For proper ONLINE function the SP3221E and cable must be connected to another RS232 Transceiver (3kΩ to 7kΩ load). SP3221E Cable unplugged ONLINE STATUS Device enters low-power mode automatically STATUS forced low SP321E RS232 Device Cable is connected to RS-232 Reciever ONLINE STATUS STATUS Drives High SP3221E comes ONLINE automatically Figure 15. SP3221E AutoOnline Operation Date: 7/21/04 SP3221E +3.0V to +5.5V RS-232 Transceiver © Copyright 2004 Sipex Corporation 12 Auto-Online Circuitry The SP3221E device has an Auto-Online circuitry on board that saves power in the system the device is designed into without changes to the existing BIOS or operating system. The S P3221E d evice incorporates an Auto-Online c ircuit that automatically enables itself when the cable is connected to another RS232 device. Conversely, the AutoOnline circuit also disables most of the internal circuitry when the cable is disconnected and goes into a standby mode where the device typically draws 1µA. This function is controlled by the ONLINE pin. When this pin is tied to a logic LOW, the Auto-Online function is active. When the cable is disconnected, the receiver inputs will be pulled down by its internal 5kΩ resistors to ground. When ONLINE is HIGH, the Auto-Online mode is disabled. When the SP3221E driver or internal charge pump are disabled, the supply current is reduced to 1µA. The Auto-Online mode can be overridden by the SHUTDOWN pin. If this pin is a logic LOW, the Auto-Online function will not operate regardless of the logic state of the ONLINE pin. Table 3 summarizes the logic of the Auto-Online operating modes. The truth table logic of the driver and receiver outputs can be found in Table 2. The STATUS pin outputs a logic LOW signal if the device is shutdown. This pin goes to a logic HIGH when the external cable is connected to another RS232 device. When the SP3221E device is shutdown, the charge pump is turned off. V+ charge pump output decays to VCC, the V- output decays to GND. The decay time will depend on the size of capacitors used for the charge pump. Once in shutdown, the time required to exit the shut down state and have valid V+ and V- levels is typically 200µs. Tying ONLINE and SHUTDOWN together will bypass the Auto-Online circuitry so this connection acts like a shutdown input pin. Date: 7/21/04 SP3221E +3.0V to +5.5V RS-232 Transceiver © Copyright 2004 Sipex Corporation 13 ESD TOLERANCE The SP3221E device incorporates ruggedized ESD cells on all driver output and receiver input pins. The ESD structure is improved over our previous family for more rugged applications and environments sensitive to electrostatic discharges and associated transients. The improved ESD tolerance is at least +15kV without damage nor latch-up. There are different methods of ESD testing applied: a) MIL-STD-883, Method 3015.7 b) IEC1000-4-2 Air-Discharge c) IEC1000-4-2 Direct Contact normal usage. The transceiver IC receives most of the ESD current when the ESD source is applied to the connector pins. The test circuit for IEC1000-4-2 is shown on Figure 18. There are two methods within IEC1000-4-2, the Air Discharge method and the Contact Discharge method. With the Air Discharge Method, an ESD voltage is applied to the equipment under test (EUT) through air. This simulates an electrically charged person ready to connect a cable onto the rear of the system only to find an unpleasant zap just before the person touches the back panel. The high energy potential on the person discharges through an arcing path to the rear panel of the system before he or she even touches the system. This energy, whether discharged directly or through air, is predominantly a function of the discharge current rather than the discharge voltage. Variables with an air discharge such as approach speed of the object carrying the ESD potential to the system and humidity will tend to change the discharge current. For example, the rise time of the discharge current varies with the approach speed. The Contact Discharge Method applies the ESD current directly to the EUT. This method was devised to reduce the unpredictability of the ESD arc. The discharge current rise time is constant since the energy is directly transferred without the air-gap arc. In situations such as hand held systems, the ESD charge can be directly discharged to the equipment from a person already holding the equipment. The current is transferred on to the keypad or the serial port of the equipment directly and then travels through the PCB and finally to the IC. RS RS The Human Body Model has been the generally accepted ESD testing method for semiconductors. This method is also specified in MIL-STD-883, Method 3015.7 for ESD testing. The premise of this ESD test is to simulate the human body’s potential to store electrostatic energy and discharge it to an integrated circuit. The simulation is performed by using a test model as shown in Figure 17. This method will test the IC’s capability to withstand an ESD transient during normal handling such as in manufacturing areas where the ICs tend to be handled frequently. The IEC-1000-4-2, formerly IEC801-2, is generally used for testing ESD on equipment and systems. For system manufacturers, they must guarantee a certain amount of ESD protection since the system itself is exposed to the outside environment and human presence. The premise with IEC1000-4-2 is that the system is required to withstand an amount of static electricity when ESD is applied to points and surfaces of the equipment that are accessible to personnel during RC RC SW1 SW1 DC Power Source SW2 SW2 CS CS Device Under Test Figure 17. ESD Test Circuit for Human Body Model Date: 7/21/04 SP3221E +3.0V to +5.5V RS-232 Transceiver © Copyright 2004 Sipex Corporation 14 Contact-Discharge Module RC RC SW1 DC Power Source RS RS RV SW2 CS S Device Under Test RS and RV add up to 330Ω for IEC1000-4-2. Figure 18. ESD Test Circuit for IEC1000-4-2 The circuit model in Figures 17 and 18 represent the typical ESD testing circuit used for all three methods. The CS is initially charged with the DC power supply when the first switch (SW1) is on. Now that the capacitor is charged, the second switch (SW2) is on while SW1 switches off. The voltage stored in the capacitor is then applied through RS, the current limiting resistor, onto the device under test (DUT). In ESD tests, the SW2 switch is pulsed so that the device under test receives a duration of voltage. For the Human Body Model, the current limiting resistor (RS) and the source capacitor (CS) are 1.5kΩ an 100pF, respectively. For IEC-1000-42, the current limiting resistor (RS) and the source capacitor (CS) are 330Ω an 150pF, respectively. The higher CS value and lower RS value in the IEC1000-4-2 model are more stringent than the Human Body Model. The larger storage capacitor injects a higher voltage to the test point when SW2 is switched on. The lower current limiting resistor increases the current charge onto the test point. DEVICE PIN TESTED Driver Outputs Receiver Inputs 30A 15A 0A t=0ns t➙ Figure 19. ESD Test Waveform for IEC1000-4-2 t=30ns HUMAN BODY MODEL ±15kV ±15kV i➙ Air Discharge ±15kV ±15kV IEC1000-4-2 Direct Contact ±8kV ±8kV Level 4 4 Table 4. Transceiver ESD Tolerance Levels Date: 7/21/04 SP3221E +3.0V to +5.5V RS-232 Transceiver © Copyright 2004 Sipex Corporation 15 PACKAGE: 16 PIN TSSOP D e Ø2 E1 E Seaing Plane Ø3 L L1 Ø1 1 2 DETAIL A INDEX AREA D x E1 22 SEE DETAIL “A” A2 A Seating Plane b A1 B 16 PIN TSSOP JEDEC MO-153 (AB) Variation A A1 A2 b c D E E1 e Ø1 Ø2 Ø3 L L1 Dimensions in (mm) MIN 0.05 0.80 0.19 0.09 4.90 1.00 5.00 6.40 BSC 4.30 4.40 0.65 BSC 0º 4º 12º REF 12º REF 0.45 0.60 1.00 REF 0.75 8º 4.50 NOM MAX 1.20 0.15 1.05 0.30 0.20 5.10 B b C Section B-B 16 PIN TSSOP Date: 7/21/04 SP3221E +3.0V to +5.5V RS-232 Transceiver © Copyright 2004 Sipex Corporation 16 PACKAGE: 16 PIN SSOP D N SEE DETAIL “A” E1 E 1 2 INDEX AREA D x E1 22 2 NX R R1 Gauge Plane A A Ø 16 PIN SSOP JEDEC MO-150 (AC) Variation A A1 A2 b c D E E1 L L1 Ø Dimensions in (mm) MIN 0.05 1.65 0.22 0.09 5.90 7.40 5.00 Seaing Plane L1 L NOM MAX 1.75 6.20 7.80 5.30 DETAIL A 2.0 1.85 0.38 0.25 6.50 8.20 5.60 WITH LEAD FINISH A2 A Seating Plane b A1 0.55 0.75 1.25 REF 0.95 c 0º 4º 8º BASE METAL b Section A-A 16 PIN SSOP Date: 7/21/04 SP3221E +3.0V to +5.5V RS-232 Transceiver © Copyright 2004 Sipex Corporation 17 ORDERING INFORMATION Part Number Operating Temperature Range Package Type SP3221ECY ........... ...............................0°C to +70°C ........................................................... 16-pin TSSOP SP3221ECY/TR ..... ...............................0°C to +70°C ........................................................... 16-pin TSSOP SP3221ECA ........... ...............................0°C to +70°C ............................................................. 16-pin SSOP SP3221ECA/TR ..... ...............................0°C to +70°C ............................................................. 16-pin SSOP SP3221EEY ......... ...............................-40°C to +85°C .......................................................... 16-pin TSSOP SP3221EEY/TR .... ...............................-40°C to +85°C .......................................................... 16-pin TSSOP SP3221EEA ......... ...............................-40°C to +85°C ............................................................ 16-pin SSOP SP3221EEA/TR .... ...............................-40°C to +85°C ............................................................ 16-pin SSOP Available in lead free packaging. To order add "-L" suffix to part number. Example: SP3221ECA/TR = standard; SP3221ECA-L/TR = lead free /TR = Tape and Reel Pack quantity is 1,500 for TSSOP and 2,500 for SSOP. Corporation ANALOG EXCELLENCE Sipex Corporation Headquarters and Sales Office 233 South Hilliview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600 e-mail: sales@sipex.com Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others. Date: 7/21/04 SP3221E +3.0V to +5.5V RS-232 Transceiver © Copyright 2004 Sipex Corporation 18