LMS202E 15KV ESD Rated, 5V Single Supply TIA/EIA-232 Dual Transceivers General Description Features The LMS202E features two transmitters and two receivers for RS-232 communication. It has a DC-to-DC converter that permits the device to operate with only a single +5V power supply. The on-chip DC-to-DC converter which utilizes four external 0.1µF capacitors to generate dual internal power supplies for RS-232 compatible output levels. n ESD protection for RS-232 I/O pins — ± 15kV-IEC1000 4-2 (EN61000-4-2) Contact Discharge — ± 8kV-IEC1000 4-2 (EN61000-4-2) Air-Gap Discharge — ± 15kV Human Body Model n Single +5V power supply n 230 kbps data rate n On-board DC-to-DC converter n 0.1µF charge pump capacitors n Drop-in replacement to Maxim’s MAX202E The device meet EIA/TIA-232E and CCITT V.28 specifications up to 230kbits/sec. The LMS202E is available in a 16 pin narrow and wide SOIC package. The transmitter outputs and receiver inputs have ± 15kV electrostatic discharge (ESD) protection. The LMS202E survives a ± 15kV ESD event to the RS-232 input and output pins when subjected according to Human Body Model or IEC 1000-4-2 (EN61000-4-2),air-gap specification. It survives a ± 8kV discharge when subjected to IEC 1000-4-2 (EN610004-2), contact specification. This device is designed for use in harsh environments where ESD is a concern. Applications n POS equipment (Bar code reader) n Hand-held equipment n General purpose RS-232 communication Connection Diagram and Typical Circuit 20048001 © 2003 National Semiconductor Corporation DS200480 www.national.com LMS202E 15KV ESD Rated, 5V Single Supply TIA/EIA-232 Dual Transceivers March 2003 LMS202E Pin Descriptions Pin Number Pin Name Pin Function 1, 3 C1+, C1− External capacitor connection pins. Recommended external capacitor C1 = 0.1µF (6.3V) 2 V+ Positive supply for TIA/EIA-232E drivers. Recommended external capacitor C4 = 0.1µF (6.3V) 4, 5 C2+, C2− External capacitor connection pins. Recommended external capacitor C2 = 0.1µF (16V) 6 V− Negative supply for TIA/EIA-232E drivers. Recommended external capacitor C3 = 0.1µF (16V) 7, 14 T1out, T2out Transmitter output pins conform to TIA/EIA-232E levels. The typical transmitter output swing is ± 8V when loaded 3kΩ load to ground. The open-circuit output voltage swings from (V+ − 0.6V) to V− 8,13 R1in, R2in Receiver inputs accept TIA/EIA-232 9, 12 R1out and R2out Receiver output pins are TTL/CMOS compatible 10, 11 Tin1, Tin2 Transmitter input pins are TTL/CMOS compatible. Inputs of transmitter do not have pull-up resistors. Connect all unused transmitter inputs to ground 15 GND Ground pin 16 VS Power supply pin for the device, +5V ( ± 10%) Ordering Information Package Part Number LMS202ECM 16-Pin SOIC LMS202ECMX LMS202EIM LMS202EIMX LMS202ECMW 16-Pin Wide SOIC LMS202ECMWX LMS202EIMW LMS202EIMWX www.national.com Package Marking LMS202ECM LMS202EIM LMS202ECMW LMS202EIMW 2 Transport Media NSC Drawing 48 Units/Rail 2.5k Units Tape and Reel 48 Units/Rail M16A 2.5k Units Tape and Reel 45 Units/Rail 1.0k Units Tape and Reel 45 Units/Rail 1.0k Units Tape and Reel M16B (Note 9) (Note 1) ESD Rating (MM) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. VS −0.3V to 6V V+ (VS − 0.3V) to + 14V V− +0.3V to −14V Driver Input Voltage, TIN 200V (Note 6) (Note 9) Soldering Information Infrared or Convection 235˚C (20sec.) Junction Temperature 150˚C Storage Temperature Range −65˚C to +150˚C −0.3V to (V+ +0.3V) ± 30V Receiver Input Voltage, RIN Driver Output Voltage TO 2kV Operating Ratings (V− −0.3V to (V+ + 0.3V) Receiver Output Voltage RO Supply Voltage VS −0.3 to (VS + 0.3) Short Circuit Duration, TO 4.5V to 5.5V Ambient Temperature Range, TA Continuous Commercial (C) ESD Rating 0˚C to +70˚C Industrial (I) IEC 1000-4-2) (Note 7) (Note 8) Air-Gap Discharge 15kV Contact Discharge 8kV Human Body Model (Note 2) (Note 8) −40˚C to +85˚C Package Thermal Resistance (Note 3) SO 71˚C/W WSO 55˚C/W 15kV Electrical Characteristics Over recommended operating supply and temperature ranges unless otherwise specified C1 = C2 = C3 = C4 = Cbp = 0.1µF Symbol Parameter Conditions Min (Note 5) Typ Max (Note 5) Units 1 7 mA ± 10 µA DC Characteristics IS Supply Current No Load, TA = 25˚C IINPUT Input Leakage Current TIN = 0V to VS Logic VTHL Input Logic Theshold Low TIN VTHH Input Logic Theshold High TIN VOL TTL/CMOS Output Voltage Low ROUT, IOUT = 3.2mA VOH TTL/CMOS Output Voltage High ROUT, IOUT = −1.0mA 0.8 2.0 0.4 3.5 V V VS −0.1 V V RS-232 Receiver Inputs VRI Receiver Input Voltage Range VRTHL Receiver Input Theshold Low VS = 5V, TA = 25˚C VRTHH Receiver Input Theshold High VS = 5V, TA = 25˚C VHYST Receiver Input Hysteresis VS = 5V RI Receiver Input Resistance VS = 5V, TA = 25˚C −30 0.8 +30 1.4 V V 2 2.4 V 0.2 0.6 1.0 V 3 5 7 kΩ ±8 RS-232 Transmitter Outputs VO Transmitter Output Voltage Swing All transmitters loaded with 3kΩ to GND ±5 RO Output Resistance VS = V+ = V− = 0V, VO = ± 2V 300 IOS Output Short Circuit Current V Ω ± 11 ± 60 mA Timing Characteristics DR Maximum Data Rate CL = 50pF to 1000pF, RL = 3kΩ to 7kΩ 3 230 kbps www.national.com LMS202E Absolute Maximum Ratings LMS202E Electrical Characteristics (Continued) Over recommended operating supply and temperature ranges unless otherwise specified C1 = C2 = C3 = C4 = Cbp = 0.1µF Symbol Parameter Conditions Min (Note 5) Typ Max (Note 5) Units 1 µs TRPLH TRPHL Receiver Propagation Delay CL = 150pF 0.08 TDPLH TDPHL Transmitter Propagation Delay 2.4 VSLEW Transition Region Slew Rate TA = 25˚C, VS = 5V CL = 50pF to 1000pF, RL = 3kΩ to 7kΩ Measured from +3V to −3V or vice versa RL = 3kΩ, CL = 2500pF All transmitters loaded 3 6 µs 30 V/µs ESD Performance: Transmitter Outputs and Receiver Inputs ESD Rating Human Body Model IEC 1000-4-2, Contact IEC 1000-4-2, Air-gap ± 15 ±8 ± 15 kV Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the Electrical Characteristics. Note 2: Human Body Model, 1.5kΩ in series with 100pF Note 3: The maximum power dissipation is a function of TJ(MAX), θJA, and TA. The maximum allowable power dissipation at any ambient temperature is PD = (TJ(MAX) − TA)/ θJA. All numbers apply for packages soldered directly onto a PC board. Note 4: Typical Values represent the most likely parametric norm. Note 5: All limits are guaranteed by testing or statistical analysis Note 6: Machine model, 0Ω in series with 200pF Note 7: IEC 1000-4-2, 330Ω in series with 150pF Note 8: ESD rating applies to pins 7,8 13 and 14 Note 9: ESD rating applies to pins 1, 2, 3, 4, 5, 6, 9, 10, 11, 12, 15 and 16 www.national.com 4 Transmitter Output High Voltage vs. Load Capacitance Transmitter Slew Rate vs. Load Capacitance 20048002 20048003 pacitor through a resistor, R2 = 1.5 kΩ. The peak current is approximately 1.33A. Application Information CAPACITOR SELECTION The recommended capacitors are 0.1µF. However, larger capacitors for the charge pump may be used to minimized ripples on V+ and V− pins. POWER SUPPLY DECOUPLING In some applications that are sensitive to power supply noise from the charge pump, place a decoupling capacitor, Cbp, from VS to GND. Use at least a 0.1µF capacitor or the same size as the charge pump capacitors (C1 − C4). CHARGED PUMP The dual internal charged-pump provides the ± 10V to the to transmitters. Using capacitor C1, the charge pump converts +5V to +10V then stores the +10V in capacitor C3. The charge pump uses capacitor C2 to invert the +10V to −10V. The −10V is then stored in capacitor C4. 20048004 FIGURE 1. HBM ESD Test Model ELECTROSTATIC DISCHARGE PROTECTION ESD protection has been placed at all pins to protect the device from ESD. All pins except for the transmitter output pins (pins 7 and 14) and receiver input pins (pins 8 and 13) have a ESD rating of 2kV Human Body Model (HBM) and 200V Machine Model (MM). The RS-232 bus pins (pins 7, 8, 13 and 14) have a more robust ESD protection. The RS-232 bus pins have a ESD rating of 15kV HBM and IEC 1000-4-2, air-gap. In addition the bus pins meet an ESD rating of 8kV with IEC 1000-4-2, contact. The ESD structures can withstand a high ESD event under the following conditions: powered-on, powered-off, and Input connected to high and low with outputs unloaded. HUMAN BODY MODEL The Human Body Model is an ESD testing standard, defined in Mil-STD-883C method 3015.7. It simulates a human discharging an ESD charge to the IC device. The rise time is approximately 10 ns and decay time is approximately 150 ns. The waveform is obtained by discharging 2kV volts ca- 20048005 FIGURE 2. HBM Waveform 5 www.national.com LMS202E Typical Characteristics LMS202E Application Information IEC 1000-4-2 (EN61000-4-2) The European Union requires ESD immunity testing for all electronic products as a condition for EMC Mark before shipping to any member countries. This is not a IC requirement but an overall system requirement. IEC 1000-4-2 specifies ESD testing both by contact and air-gap discharge. ESD testing by contact are generally more repeatable than air-gap but is less realistic to actual ESD event. However, air-gap discharge is more realistic but ESD results may vary widely dependent on environmental conditions (temperature, humidity,....) The waveform is obtained by discharging 150pF capacitor through a resistor, R2 = 330Ω. A typical peak current may be high as 37A with 10kV. (Continued) MACHINE MODEL The Machine Model is the standard ESD test method in Japan and the automotive industry. It simulates a charge on large object discharging through the IC device. This takes place in automated test and handling systems. The equipment can accumulate static charge due to improper grounding, which is transmitted through the IC when it is picked and placed. The waveform is obtained by discharging 400V volts capacitor to the device. Resistor, R2 = 0Ω. The parasitic inductance, L, from the PCB affects the peak current and period of the waveform. For L = 0.5µF, the peak current is approximately 7A with a period of 60 ns. For L = 2.5µH, the peak current is reduced to 4A with a period of 140 ns. 20048004 FIGURE 5. IEC ESD Model 20048004 FIGURE 3. MM ESD Model 20048009 FIGURE 6. IEC Waveform 20048007 FIGURE 4. MM Waveform www.national.com 6 LMS202E Physical Dimensions inches (millimeters) unless otherwise noted 16-Pin SOIC NS Package Number M16A 16-Pin Wide SOIC NS Package Number M16B 7 www.national.com LMS202E 15KV ESD Rated, 5V Single Supply TIA/EIA-232 Dual Transceivers Notes LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. National Semiconductor Americas Customer Support Center Email: [email protected] Tel: 1-800-272-9959 www.national.com National Semiconductor Europe Customer Support Center Fax: +49 (0) 180-530 85 86 Email: [email protected] Deutsch Tel: +49 (0) 69 9508 6208 English Tel: +44 (0) 870 24 0 2171 Français Tel: +33 (0) 1 41 91 8790 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. National Semiconductor Asia Pacific Customer Support Center Fax: +65-6250 4466 Email: [email protected] Tel: +65-6254 4466 National Semiconductor Japan Customer Support Center Fax: 81-3-5639-7507 Email: [email protected] Tel: 81-3-5639-7560 National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.