TI UCC5519PWP

The UCC5519 is a multimode small computer system interface (SCSI) terminator that integrates the mode change delay function required by the SPI–3 specification. The device senses what types of SCSI drivers are present on the bus via the voltage on the DIFFSENS SCSI control line. High-voltage differential (HVD) SCSI drivers (EIA485) are not supported. If the chip detects the presence of a HVD SCSI device, it disconnects itself by switching all terminating resistors off the bus and enters a high-impedance state. The terminator can also be commanded to disconnect the terminating resistors with the DISCNCT input. Impedance is trimmed for accuracy and maximum effectiveness. Bus lines are biased to a fail-safe state to ensure signal integrity.

• Meets SCSI–2, Ultra2 (SPI–2), Ultra3/Ultra160 (SPI–3), and Ultra320 (SPI–4) Standards
• 2.7-V to 5.25-V Termpwr Operation
• Built in SPI–3 Delay
• 3-pF Channel Capacitance
• Pin Compatible with SS–AR7519 225-mA MIN Source Regulator, Supports SE With all 9 Lines Low
• Available in a 28-Pin (PWP) TSSOP Package