onsemi MCCS142238DWR2

The MCCS142238 is a precision 18-bit switchable active SCSI-2 bus terminator with an on-board 2.85V regulator. When the Disconnect pin is HIGH according to the truth table below, the MCCS142238 provides 110Ω±5% precision resistor pull-ups to a 2.85V reference for termination of 18-bits in a SCSI-2 standard bus system interface. When the Disconnect pin is LOW, the device outputs are in the high impedance state on all 18 bits. The regulator is also turned off, greatly reducing standby power. Even with no Termpwr applied, the outputs remain in the high impedance state.

• Complies With SCSI and SCSI-2 Standards
• Pin Compatible With UC5609
• 18 Switchable 110Ω Terminating Resistors
• 4pF Channel Capacitance During Disconnect
• Fully Supports Active Negation (Sinks Minimum of 220mA)
• Built-In 2.85V Regulator With Low Dropout Voltage
• Very Low Supply Current When Resistors Are Disabled (150μA Max)
• –650mA Source Current
• Thermal Shutdown Protection
• Thin Profile Surface Mount Package: 28-Lead SOIC

• 8-bit SCSI applications (“A” cable)