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 16 SHUTDOWN 1 C1+ 2 15 VCC V+ 3 C1- 4 13 T1OUT C2+ 5 12 ONLINE C2- 6 11 T1IN V- 7 10 STATUS R1IN 8 9 R1OUT 14 GND SP3221 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 Power Supplies RS-232 Drivers RS-232 Receivers External Components Auto-Online Circuitry TTL 3-State No. of Pins SP3221E +3.0V to +5.5V 1 1 4 (0.1µF) capacitors YES YES 16 SP3220E +3.0V to +5.5V 1 1 4 (0.1µF) capacitors NO YES 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 1 © Copyright 2004 Sipex Corporation Power Dissipation per package ABSOLUTE MAXIMUM RATINGS 16-pin PDIP (derate 14.3mW/oC above+70oC).....1150mW 16-pin SSOP (derate 9.69mW/oC above +70oC)....775mW 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 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 MIN. TYP. MAX. UNITS CONDITIONS Supply Current, Auto-Online 1.0 10 µA All RxIN open, ONLINE = GND, SHUTDOWN = VCC, VCC = +3.3V, TAMB = +25° C Supply Current, Shutdown 1.0 10 µA SHUTDOWN = GND, VCC = +3.3V, TAMB = +25° C Supply Current, Auto-Online Disabled 0.3 1.0 mA ONLINE = SHUTDOWN = VCC, no load, VCC = +3.3V, TAMB = +25° C 0.8 V DC CHARACTERISTICS LOGIC INPUTS AND RECEIVER OUTPUTS Input Logic Threshold LOW HIGH 2.0 VCC = +3.3V or +5.0V, TxIN, EN, ONLINE, SHUTDOWN Input Leakage Current ±0.01 ±1.0 µA TxIN, EN, ONLINE, SHUTDOWN, TAMB = +25° C Output Leakage Current ±0.05 ±10 µA Receivers disabled 0.4 V IOUT = 1.6mA V IOUT = -1.0mA Output Voltage LOW Output Voltage HIGH Date: 7/21/04 VCC - 0.6 VCC - 0.1 SP3221E +3.0V to +5.5V RS-232 Transceiver 2 © Copyright 2004 Sipex Corporation 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 MIN. TYP. Output Voltage Swing ± 5.0 ± 5. 4 Output Resistance 30 0 MAX. UNITS CONDITIONS DRIVER OUTPUTS Output Short-Circuit Current ± 35 ± 70 Output Leakage Current V All driver outputs loaded with 3KΩ to GND, TAMB = +25° C Ω VCC = V+ = V- = 0V, VOUT = ± 2V ± 60 ± 100 mA ± 25 µA 15 V VOUT = 0V VOUT = ± 15V VCC = 0V or 3.0V to 5.5V, VOUT = ± 12V, Drivers disabled RECEIVER INPUTS Input Voltage Range -15 Input Threshold LOW 0.6 1.2 V VCC = 3.3V Input Threshold LOW 0. 8 1.5 V VCC = 5.0V Input Threshold HIGH 1. 5 2.4 V VCC = 3.3V Input Threshold HIGH 1. 8 2.4 V VCC = 5.0V Input Hysteresis 0. 3 Input Resistance 3 V 5 7 kΩ Auto-Online CIRCUITRY CHARACTERISTICS (ONLINE = GND, SHUTDOWN = VCC) STATUS Output Voltage LOW STATUS Output Voltage HIGH 0.4 VCC - 0.6 V IOUT = 1.6mA V IOUT = -1.0mA Receiver Threshold to Drivers Enabled (tONLINE) 200 µS Figure 15 Receiver Positive or Negative Threshold to STATUS HIGH (tSTSH) 0.5 µS Figure 15 Receiver Positive or Negative Threshold to STATUS LOW (tSTSL) 20 µS Figure 15 Date: 7/21/04 SP3221E +3.0V to +5.5V RS-232 Transceiver 3 © Copyright 2004 Sipex Corporation 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 MIN. TYP. MAX. UNITS CONDITIONS 120 240 kbps Receiver Propagation Delay tPHL tPLH 0.3 0.3 µs Receiver input to Receiver output, CL = 150pF Receiver Output Enable Time 200 ns Normal operation Receiver Output Disable Time 200 ns Normal operation Driver Skew 100 500 ns | tPHL - tPLH |, TAMB = 25oC Receiver Skew 200 1000 ns | tPHL - tPLH | 30 V/µs TIMING CHARACTERISTICS Maximum Data Rate Transition-Region Slew Rate RL = 3KΩ, CL = 1000pF, one driver active VCC= 3.3V, RL = 3KΩ, TAMB = 25oC, measurements taken from -3.0V to +3.0V or +3.0V to -3.0V 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. 14 12 4 10 Vout+ Vout- 2 Slew Rate [V/µs] Transmitter Output Voltage [V] 6 0 0 1000 500 1500 -2 8 6 +Slew -Slew 4 2 -4 0 -6 0 Load Capacitance [pF] 500 1000 1500 Load Capacitance [pF] 2000 Figure 2. Slew Rate VS. Load Capacitance Figure 1. Transmitter Output Voltage VS. Load Capacitance 40 118KHz 60KHz 10KHz Supply Current [mA] 35 30 25 20 15 10 5 0 0 500 1000 1500 Load Capacitance [pF] 2000 Figure 3. Supply Current VS. Load Capacitance when Transmitting Data Date: 7/21/04 SP3221E +3.0V to +5.5V RS-232 Transceiver 4 © Copyright 2004 Sipex Corporation NAME FUNCTION PIN NO. EN Receiver Enable. Apply logic HIGH for normal operation. Apply logic LOW to disable the receiver outputs (high-Z state). 1 C1+ Positive terminal of the voltage doubler charge-pump capacitor. 2 V+ Regulated +5.5V output generated by the charge pump. 3 C1- Negative terminal of the voltage doubler charge-pump capacitor. 4 C2+ Positive terminal of the inverting charge-pump capacitor. 5 C2- Negative terminal of the inverting charge-pump capacitor. 6 V- Regulated -5.5V output generated by the charge pump. 7 RS-232 receiver input. 8 TTL/CMOS receiver output. 9 TTL/CMOS Output indicating ONLINE and SHUTDOWN status. 10 TTL/CMOS driver input. 11 Apply logic HIGH to override Auto-Online circuitry keeping drivers active (SHUTDOWN must also be logic HIGH, refer to Table 2). 12 RS-232 driver output. 13 Ground. 14 +3.0V to +5.5V supply voltage. 15 R1IN R1OUT STATUS T1IN ONLINE T1OUT GND VCC Apply logic LOW to shut down drivers and charge pump. SHUTDOWN This overrides all Auto-Online circuitry and ONLINE (refer to Table 2). 16 Table 1. Device Pin Description Date: 7/21/04 SP3221E +3.0V to +5.5V RS-232 Transceiver 5 © Copyright 2004 Sipex Corporation EN 16 SHUTDOWN 1 C1+ 2 V+ 3 C1- 4 C2+ 15 VCC 14 GND SP3221 13 T1OUT 5 12 ONLINE C2- 6 11 T1IN V- 7 10 STATUS R1IN 8 9 R1OUT Figure 4. SP32221E Pinout Configuration C5 C1 + + VCC 15 0.1µF VCC 2 C1+ 3 0.1µF C3 4 C15 C2+ C2 V+ + V- 6 C2T1OUT 13 11 T1IN 9 R1OUT TTL/CMOS OUTPUTS 0.1µF 7 C4 0.1µF TTL/CMOS INPUTS SP3221 + R1IN 5KΩ 8 + 0.1µF RS-232 OUTPUTS RS-232 INPUTS 1 EN 12 ONLINE VCC TO POWER MANAGEMENT UNIT 16 SHUTDOWN 10 STATUS GND 14 Figure 5. SP3221E Typical Operating Circuit Date: 7/21/04 SP3221E +3.0V to +5.5V RS-232 Transceiver 6 © Copyright 2004 Sipex Corporation DESCRIPTION Drivers The SP3221E transceiver 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 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 3KΩ in parallel with 1000pF, ensuring compatibility with PC-to-PC communication software. 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. 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. 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. Date: 7/21/04 SP3221E +3.0V to +5.5V RS-232 Transceiver 7 © Copyright 2004 Sipex Corporation +3V to +5V DEVICE: SP3221E SHUTDOWN TXOUT EN C5 RXOUT C1 + + 19 VCC 0.1µF 2 C1+ V+ C3 0 0 High Z Active 0 1 High Z High Z C2 1 0 Active Active TTL/CMOS INPUTS 11 T1IN 1 1 Active High Z TTL/CMOS OUTPUTS 9 R1OUT 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. + 0.1µF VCC SP3221E V- 0.1µF 7 C4 6 C2T1OUT R1IN + 0.1µF 13 8 5KΩ 1000pF 1 EN 20 14 To µP Supervisor Circuit 11 SHUTDOWN ONLINE STATUS Receivers GND 18 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. Figure 6. Loopback Test Circuit for RS-232 Driver Data Transmission Rates 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. 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. Driving EN to a logic HIGH forces the output of the receiver into high-impedance. [ T ] [ T T ] T T1 IN 1 T1 OUT 2 T1 OUT 2 T T T T R1 OUT 3 R1 OUT 3 Ch1 5.00V Ch3 5.00V Ch2 5.00V M 5.00µs Ch1 Ch1 5.00V Ch3 5.00V 0V Figure 7. Loopback Test Circuit Result at 250Kbps (Driver Fully Loaded) Date: 7/21/04 + 4 C15 C2+ T1 IN 1 3 0.1µF Ch2 5.00V M 2.50µs Ch1 0V Figure 8. Loopback Test Circuit result at 235Kbps (Driver Fully Loaded) SP3221E +3.0V to +5.5V RS-232 Transceiver 8 © Copyright 2004 Sipex Corporation Charge Pump 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. 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. 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. 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. 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. 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. 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. 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. Date: 7/21/04 SP3221E +3.0V to +5.5V RS-232 Transceiver 9 © Copyright 2004 Sipex Corporation S H U T RECEIVER +2.7V 0V RS-232 INPUT VOLTAGES -2.7V D O W N VCC STATUS 0V tSTSL tSTSH tONLINE +5V DRIVER RS-232 OUTPUT VOLTAGES 0V -5V Figure 9. Auto-Online Timing Waveforms VCC = +5V C4 +5V C1 + C2 – –5V + – – + VDD Storage Capacitor + – VSS Storage Capacitor C3 –5V Figure 10. Charge Pump — Phase 1 VCC = +5V C4 C1 + – C2 + – – + + – VDD Storage Capacitor VSS Storage Capacitor C3 –10V Figure 11. Charge Pump — Phase 2 Date: 7/21/04 SP3221E +3.0V to +5.5V RS-232 Transceiver 10 © Copyright 2004 Sipex Corporation [ T ] +6V a) C2+ T 1 0V 2 2 0V b) C2T -6V Ch1 2.00V Ch2 2.00V M 1.00µs Ch1 1.96V Figure 12. Charge Pump Waveforms VCC = +5V C4 +5V C1 + C2 – –5V + – – + + – VDD Storage Capacitor VSS Storage Capacitor C3 –5V Figure 13. Charge Pump — Phase 3 VCC = +5V +10V C4 + C1 + – 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 11 © Copyright 2004 Sipex Corporation RS-232 Cable Connected? SHUTDOWN INPUT ONLINE INPUT STATUS OUTPUT TRANSCEIVER STATUS TxOUT YES HIGH - HIGH Normal Operation Active NO HIGH HIGH LOW Normal Operation Active NO HIGH LOW LOW Shutdown (Auto-Online) HiZ YES LOW - HIGH Shutdown HiZ NO LOW - LOW Shutdown HiZ 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 SP3221E comes ONLINE automatically STATUS Drives High Figure 15. SP3221E AutoOnline Operation Date: 7/21/04 SP3221E +3.0V to +5.5V RS-232 Transceiver 12 © Copyright 2004 Sipex Corporation Auto-Online Circuitry Tying ONLINE and SHUTDOWN together will bypass the Auto-Online circuitry so this connection acts like a shutdown input pin. 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 SP3221E device incorporates an Auto-Online circuit 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. Date: 7/21/04 SP3221E +3.0V to +5.5V RS-232 Transceiver 13 © Copyright 2004 Sipex Corporation 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. 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. 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. 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 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 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. 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 R RSS R RC C SW2 SW2 SW1 SW1 C CSS DC Power Source 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 14 © Copyright 2004 Sipex Corporation Contact-Discharge Module R RSS R RC C RV SW2 SW1 Device Under Test CSS DC Power Source RS and RV add up to 330Ω for IEC1000-4-2. Figure 18. ESD Test Circuit for IEC1000-4-2 i➙ 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. 30A 15A 0A 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. t=0ns t=30ns t➙ Figure 19. ESD Test Waveform for IEC1000-4-2 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 HUMAN BODY MODEL Air Discharge Driver Outputs Receiver Inputs ±15kV ±15kV ±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 15 © Copyright 2004 Sipex Corporation PACKAGE: 16 PIN TSSOP D e Ø2 E1 E Seaing Plane L Ø3 L1 1 Ø1 DETAIL A 2 INDEX AREA D x E1 2 2 SEE DETAIL “A” A2 A Seating Plane A1 b B 16 PIN TSSOP JEDEC MO-153 (AB) Variation Dimensions in (mm) MIN A - A1 0.05 B NOM MAX - 1.20 - 0.15 1.05 A2 0.80 1.00 b 0.19 - 0.30 c 0.09 - 0.20 D 4.90 5.00 b 5.10 C E E1 6.40 BSC 4.30 4.40 4.50 Section B-B e Ø1 0º 4º 8º Ø2 12º REF Ø3 12º REF L L1 Date: 7/21/04 0.65 BSC 0.45 0.60 0.75 16 PIN TSSOP 1.00 REF SP3221E +3.0V to +5.5V RS-232 Transceiver 16 © Copyright 2004 Sipex Corporation PACKAGE: 16 PIN SSOP D N SEE DETAIL “A” E E1 1 2 INDEX AREA D x E1 2 2 2 NX R R1 A Gauge Plane 16 PIN SSOP JEDEC MO-150 (AC) Variation MIN A1 0.05 - A2 1.65 1.75 b 0.22 - 0.38 c 0.09 - 0.25 D 5.90 6.20 E 7.40 7.80 8.20 5.00 5.30 5.60 0.55 0.75 0.95 - 2.0 A2 1.85 A Seating Plane L1 Ø Ø DETAIL A NOM MAX - L A L L1 A E1 Seaing Plane Dimensions in (mm) 6.50 WITH LEAD FINISH c 1.25 REF 0º 4º A1 b 8º BASE METAL b Section A-A 16 PIN SSOP Date: 7/21/04 SP3221E +3.0V to +5.5V RS-232 Transceiver 17 © Copyright 2004 Sipex Corporation 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: [email protected] 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 18 © Copyright 2004 Sipex Corporation