onsemi MCCS142237DT

The MCCS142237 is a precision 9–bit switchable active SCSI–2 bus terminator with an on–board 2.85V regulator. The SCSI–2 standard recommends the use of active terminations at both ends of every cable segment in a SCSI system with single–ended drivers and receivers. The MCCS142237 enables the designer to gain the benefits of active termination: greater immunity to voltage drops on the TERMPWR (TERMination PoWeR) line, enhanced high–level immunity, intrinsic TERMPWR decoupling, and very low quiescent current consumption. When the device is enabled (PD = HIGH), the MCCS142237 provides 110Ω precision resistor pull–ups to a 2.85V reference for termination of 9–bits in a SCSI–2 standard bus system interface. When PD is LOW, the device is in the High Impedance State on all 9 bits.

• Complies With SCSI and SCSI–2 Standards
• Pin Compatible With DS2107, DS2107A and DS21S07A
• 9 Switchable 110Ω Terminating Resistors
• Power–Down Mode Disengages Terminating Resistors
• Built–In 2.85V Regulator
• Guaranteed Maximum 1.0V Dropout Voltage
• 3pF Channel Capacitance During “Power–Down”
• Thermal Shutdown Circuitry
• Fully Supports Active Negation SCSI Signals
• Regulator Short Circuit Protection
• Thin Profile 20–Pin TSSOP and 16–Pin SOIC Packages

• 8–bit SCSI applications (“A” cable)
• 16–bit WIDE SCSI applications (“P” cable)