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MCCS142238 데이터시트 PDF




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부품번호 MCCS142238 기능
기능 18-Bit Switchable Active SCSI-2 Bus Terminator
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MCCS142238 데이터시트, 핀배열, 회로
MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
18ĆBit Switchable Active
SCSIĆ2 Bus Terminator (110)
With Voltage Regulator and
Inverted Disconnect
MCCS142238
The MCCS142238is 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±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.
18-BIT SWITCHABLE
ACTIVE SCSI-2
BUS TERMINATOR
Complies With SCSI and SCSI-2 Standards
Pin Compatible With UC5609
For Opposite Disconnect Polarity See Motorola’s MCCS142236
18 Switchable 110Terminating 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
DW SUFFIX
28–LEAD WIDE SOIC PACKAGE
CASE 751F-04
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 (150µA), 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
0
1
Output
Z
Terminated
MCCS and Mfax are trademarks of Motorola, Inc.
1/97
© Motorola, Inc. 1997
1
REV 2




MCCS142238 pdf, 반도체, 판매, 대치품
MCCS142238
Termpwr
Reg
Disconnect
50k
+
Thermal
Shutdown
Shunt
Control
Voltage
Reference
Enable
Logic
Charge
Pump
Figure 2. MCCS142238 Block Diagram
110
Line 1
110
Line 18
PATENTED CIRCUIT
DESIGN
TO
RECEIVERS
TO
RECEIVERS
Termpwr
Disconnect
Reg
MCCS142238
Line 18
Line 1
2.2µF 2.2µF
2.2µF 2.2µF
0.1µF
0.1µF
Termpwr
Reg
Disconnect
MCCS142238
Line 1
Line 18
BUS DRIVER
BUS DRIVER
BUS DRIVER
SCSI
CABLE
BUS DRIVER
Figure 3. Typical SCSI Bus Configuration Using the MCCS142238
TO
RECEIVERS
TO
RECEIVERS
MOTOROLA
30Terminated
Reg 80
Output
High Impedance
4pF
Figure 4. Output Impedance Model
4
SCSI TERMINATORS
BR1486

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