LMS202IMX

LMS202 5V Single Supply TIA/EIA-232 Dual Transceivers March 2003 LMS202 5V Single Supply TIA/EIA-232 Dual Transceivers General Description The LMS202 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. The device meet EIA/TIA-232E and CCITT V.28 specifications up to 230kbits/sec. The LMS202 is available in a 16 pin narrow and Wide SOIC package. Features n n n n n Single +5V power supply 230 kbps data rate On-board DC-to-DC converter 0.1µF charge pump capacitors Drop-in replacement to Maxim’s MAX202 Applications n POS equipment (Bar code reader) n Hand-held equipment n General purpose RS-232 communication Connection Diagram and Typical Circuit 20062901 © 2003 National Semiconductor Corporation DS200629 www.national.com LMS202 Pin Descriptions Pin Number 1, 3 2 4, 5 6 7, 14 Pin Name C1+, C1− V+ C2+, C2− V− T1out, T2out Pin Function External capacitor connection pins. Recommended external capacitor C1 = 0.1µF (6.3V) Positive supply for TIA/EIA-232E drivers. Recommended external capacitor C4 = 0.1µF (6.3V) External capacitor connection pins. Recommended external capacitor C2 = 0.1µF (16V) Negative supply for TIA/EIA-232E drivers. Recommended external capacitor C3 = 0.1µF (16V) 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− Receiver inputs accept TIA/EIA-232 Transmitter input pins are TTL/CMOS compatible. Inputs of transmitter do not have pull-up resistors. Connect all unused transmitter inputs to ground Ground pin Power supply pin for the device, +5V ( ± 10%) 8,13 9, 12 10, 11 15 16 R1in, R2in Tin1, Tin2 GND VS R1out and R2out Receiver output pins are TTL/CMOS compatible Ordering Information Package Part Number LMS202CM 16-Pin SOIC LMS202CMX LMS202IM LMS202IMX LMS202CMW 16-Pin Wide SOIC LMS202CMWX LMS202IMW LMS202IMWX Package Marking LMS202CM LMS202IM LMS202CMW LMS202IMW Transport Media 48 Units/Rail 2.5k Units Tape and Reel 48 Units/Rail 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 M16A NSC Drawing www.national.com 2 LMS202 Absolute Maximum Ratings (Note 1) Infrared or Convection (20sec.) Junction Temperature Storage Temperature Range 235˚C 150˚C −65˚C to +150˚C If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. VS V+ V− Driver Input Voltage, TIN Receiver Input Voltage, RIN Driver Output Voltage TO Receiver Output Voltage RO Short Circuit Duration, TO ESD Rating Human Body Model (Note 2) Machine Model (Note 6) Soldering Information 2kV 200V −0.3V to 6V (VS − 0.3V) to + 14V +0.3V to −14V −0.3V to (V+ +0.3V) Operating Ratings Supply Voltage VS Ambient Temperature Range, TA Commercial (C) Industrial (I) Package Thermal Resistance (Note 3) SO WSO 71˚C/W 55˚C/W 0˚C to +70˚C −40˚C to +85˚C 4.5V to 5.5V ± 30V (V− −0.3V to (V+ + 0.3V) −0.3 to (VS + 0.3) Continuous Electrical Characteristics Over recommended operating supply and temperature ranges unless otherwise specified C1 = C2 = C3 = C4 = Cbp = 0.1µF Symbol DC Characteristics IS Logic IINPUT VTHL VTHH VOL VOH Input Leakage Current Input Logic Theshold Low Input Logic Theshold High TTL/CMOS Output Voltage Low TTL/CMOS Output Voltage High Receiver Input Voltage Range Receiver Input Theshold Low Receiver Input Theshold High Receiver Input Hysteresis Receiver Input Resistance Transmitter Output Voltage Swing Output Resistance Output Short Circuit Current Maximum Data Rate CL = 50pF to 1000pF, RL = 3kΩ to 7kΩ 230 0.08 2.4 1 VS = 5V, TA = 25˚C VS = 5V, TA = 25˚C VS = 5V VS = 5V, TA = 25˚C All transmitters loaded with 3kΩ to GND VS = V+ = V− = 0V, VO = ± 2V 0.2 3 TIN = 0V to VS TIN TIN ROUT, IOUT = 3.2mA ROUT, IOUT = −1.0mA 3.5 VS −0.1 2.0 0.4 Supply Current No Load, TA = 25˚C 1 7 mA µA V V V V Parameter Conditions Min (Note 5) Typ Max (Note 5) Units ± 10 0.8 RS-232 Receiver Inputs VRI VRTHL VRTHH VHYST RI VO RO IOS DR TRPLH TRPHL TDPLH TDPHL −30 0.8 1.4 2 0.6 5 2.4 1.0 7 +30 V V V V kΩ V Ω RS-232 Transmitter Outputs ±5 300 ±8 ± 11 ± 60 mA kbps µs µs Timing Characteristics Receiver Propagation Delay CL = 150pF Transmitter Propagation Delay RL = 3kΩ, CL = 2500pF All transmitters loaded 3 www.national.com LMS202 Electrical Characteristics Symbol VSLEW Parameter (Continued) Over recommended operating supply and temperature ranges unless otherwise specified C1 = C2 = C3 = C4 = Cbp = 0.1µF Conditions Min (Note 5) 3 Typ 6 Max (Note 5) 30 Units V/µs 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 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 Typical Characteristics Transmitter Output High Voltage vs. Load Capacitance Transmitter Slew Rate vs. Load Capacitance 20062902 20062903 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. www.national.com 4 LMS202 Physical Dimensions inches (millimeters) unless otherwise noted 16-Pin SOIC NS Package Number M16A 16-Pin Wide SOIC NS Package Number M16B 5 www.national.com