LMS202 Datasheet | National Semiconductor

Description The LMS202 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 specifica.. 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 munication Connection Diagram and Typical Circuit © 2003 National Semiconductor Corporation DS200629 .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 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 patible. 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 patible Ordering Information Package Part Number LMS202CM 16-Pin SOIC LMS202CMX LMS202IM LMS202IMX LMS202CMW 16-Pin Wide SOIC...