AD7306

a FEATURES RS-232 and RS-422 on One Chip Single +5 V Supply 0.1 ␮ F Capacitors Short Circuit Protection Excellent Noise Immunity Low Power BiCMOS Technology High Speed, Low Skew RS-422 Operation –40؇C to +85؇C Operations APPLICATIONS DTE-DCE Interface Packet Switching Local Area Networks Data Concentration Data Multiplexers Integrated Services Digital Network (ISDN) GENERAL DESCRIPTION +5 V Powered RS-232/RS-422 Transceiver AD7306 FUNCTIONAL BLOCK DIAGRAM V+ C1+ C1– R2 IN T1OUT T2OUT VCC R1 IN (B) R1 IN /R1 IN (A) T3OUT (B) T3OUT (A) NC 1 2 3 4 5 6 7 8 9 10 11 12 NC = NO CONNECT 24 23 22 21 20 V– C2– C2+ R2 OUT T1IN T2IN GND R1 OUT T3IN 232/422 SEL GND NC AD7306 SOIC TOP VIEW (Not to Scale) 19 18 17 16 15 14 13 The AD7306 line driver/receiver is a 5 V monolithic product which provides an interface between TTL signal levels and dual standard EIA RS-232/RS-422 signal levels. The part contains two RS-232 drivers, one RS-422 driver, one RS-232 receiver, and one receiver path which can be configured either as RS-232 or as RS-422. An internal charge pump voltage converter facilitates operation from a single +5 V power supply. The internal charge pump generates ± 10 V levels allowing RS-232 output levels to be developed without the need for external bipolar power supplies. A highly efficient charge pump design allows operation using non polarized, miniature 0.1 µF capacitors. This gives a considerable saving in printed circuit board space over conventional products which can use...