LX5205

LIN D O C #: 5205 LX5205 18-L INE P LUG T H E AND P LAY , µP OWER SCSI T ERMINATOR D A T A I N F I N I T E P O W E R O F I N N O VA T I O N P R E L I M I N A R Y S H E E T DESCRIPTION The LX5205 is an eighteen line active terminator for the SCSI parallel bus. This SCSI standard recommends active termination at both ends of the SCSI bus. During disconnect mode, the LX5205 requires a meager 500nA of supply current while offering only 2.5pF of output capacitance. To enter this low power mode, the disconnect pins can be left open (floating) or driven low thereby disconnecting the terminating resistors and placing the internal low dropout regulator into low power mode. In disconnect mode each termination line presents a high impedance to the SCSI bus with the overall effect being to preserve high signal integrity and subsequent reliable, error free communications. The LX5205 has two disconnect pins for SCSI Plug and Play (PnP) applications. During normal operation, the LX5205 consumes only 800µA of current which is the lowest enabled supply current of any terminator available on the market today. Linfinity's proprietary BiCMOS low dropout regulator architecture enables this unique and very efficient operating characteristic. The LX5205 also offers a precisely trimmed channel output current specified to a 5% tolerance. The maximum value of the output current is trimmed as closely as possible to the SCSI standard maximum specification to give the highest possible nois...