LMS202E Datasheet | National Semiconductor

Description The LMS202E features two transmitters and two receivers for RS-232 munication. 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 patible output levels. 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 ± 15k V electrostatic discharge (ESD) protection. The LMS202E survives a ± 15k V 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 ± 8k V 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. Features n ESD protection for RS-232 I/O pins - ± 15k V-IEC1000 4-2 (EN61000-4-2) Contact Discharge - ± 8k V-IEC1000 4-2 (EN61000-4-2) Air-Gap Discharge - ± 15k V 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 Applications n POS equipment (Bar code reader) n Hand-held equipment n General purpose RS-232 munication Connection Diagram and Typical Circuit © 2003 National Semiconductor Corporation DS200480 .national. 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. Remended external capacitor C1 = 0.1µF (6.3V) Positive supply for TIA/EIA-232E drivers. Remended external capacitor C4 = 0.1µF (6.3V) External capacitor connection pins. Remended external capacitor C2 = 0.1µF (16V) Negative supply for TIA/EIA-232E drivers. Remended external capacitor C3 = 0.1µF (16V) Transmitter output pins conform to TIA/EIA-232E levels. The...