LMS202

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 specificawww.DataSheet4U.com tions 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) Tran...