SP303

Corporation SIGNAL PROCESSING EXCELLENCE SP303 RS232/AppleTalk™ Serial Transceiver s Single chip serial transceiver supports AppleTalkTM or RS-232 interface s Programmable Selection of Interface s 4 RS-232 Drivers and 4 RS-232 Receivers s Provides MacintoshTM type interface s ±30V Receiver Input Levels s Surface Mount Packaging DESCRIPTION… The SP303 is a single chip device that offers both RS-232 and AppleTalk™ interfaces. When configured for RS-232 mode the SP303 has 4 drivers and 4 receivers. When the part is programmed for AppleTalk mode, the SP303 supports Macintosh–type ports. All drivers and receivers can operate at data rates up to 1 Mbps. The differential driver used for transmitting data signals is equipped with a tri-state function. The SP303 is available in a 28–pin SOIC package for operation over the commercial temperature range. +5V INPUT +12V INPUT –12V INPUT TOUTB1 TOUTB2 TOUTA1 TOUTA2 RINA1 RINA2 VCC VDD VEE SELECT AB T1 T2 T3 T4 R1 SP303 R2 RINB1 RINB2 GND R3 R4 TINB1 TINB2 TINA1 TINA2 TXEN ROUTA1 ROUTA2 ROUTB1 ROUTB2 Corporation SIGNAL PROCESSING EXCELLENCE 69 SPECIFICATIONS (TMIN ≤TA ≤TMAX and nominal supply voltages unless otherwise noted) PARAMETER MIN. TYP. MAX. RS--232 DRIVER TTL Input Level VIL VIH High Level Output Low Level Output Short Circuit Current Slew Rate Transition Time Maximum Transmission Rate 0 2.0 +5.0 200 RS-232 RECEIVER Input Voltage Range Input High Threshold Input Low Threshold Input Impedance TTL Output...