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MCCS142238 Datasheet(PDF) 1 Page - ON Semiconductor |
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MCCS142238 Datasheet(HTML) 1 Page - ON Semiconductor |
1 / 5 page MOTOROLA SEMICONDUCTOR TECHNICAL DATA 1 REV 2 © Motorola, Inc. 1997 1/97 18Bit Switchable Active SCSI2 Bus Terminator (110Ω) With Voltage Regulator and Inverted Disconnect 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 110 Ω ±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 • For Opposite Disconnect Polarity See Motorola’s MCCS142236 • 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 The regulator has a guaranteed dropout voltage of less than 900mV, allowing regulation of supply voltages less than 4.0V. The MCCS142238 is protected by thermal shutdown. Other features include low disconnect current (150 µA), over 220mA of active negation current sink capability, and 4pF disconnect capacitance. In 8-bit SCSI applications (“A” cable), only one MCCS142238 is needed at each end of the SCSI cable in order to terminate the 18 active signal lines. For information on “Power Dissipation for Active SCSI Terminators,” refer to Motorola Application Note AN1408/D, available through the Motorola Design–NET Fax System as “HOT–DOC” Number 1083, or through the Motorola Literature Distribution Center. TRUTH TABLE Disconnect Output 0 Z 1 Terminated MCCS and Mfax are trademarks of Motorola, Inc. MCCS142238 18-BIT SWITCHABLE ACTIVE SCSI-2 BUS TERMINATOR DW SUFFIX 28–LEAD WIDE SOIC PACKAGE CASE 751F-04 |
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