MCCS142238DWR2 ON Semiconductor, MCCS142238DWR2 Datasheet

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MCCS142238DWR2

Manufacturer Part Number
MCCS142238DWR2
Description
Manufacturer
ON Semiconductor
Type
SCSI Terminationr
Datasheet

Specifications of MCCS142238DWR2

Termination Resistance (rt Or Rterm) (typ)
110Ohm
Number Of Bits
18
Operating Supply Voltage (min)
3.8V
Operating Supply Voltage (typ)
5V
Operating Supply Voltage (max)
5.25V
Package Type
SOIC
Mounting
Surface Mount
Pin Count
28
Operating Temperature Classification
Commercial
Lead Free Status / RoHS Status
Not Compliant
MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
18 Bit Switchable Active
SCSI 2 Bus Terminator (110 )
With Voltage Regulator and
Inverted Disconnect
terminator with an on-board 2.85V regulator. When the Disconnect pin is
HIGH according to the truth table below, the MCCS142238 provides
110
of 18-bits in a SCSI-2 standard bus system interface.
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.
MCCS142238 is protected by thermal shutdown. Other features include low disconnect current (150 A), over 220mA of active
negation current sink capability, and 4pF disconnect capacitance.
18 active signal lines.
through the Motorola Design–NET Fax System as “HOT–DOC” Number 1083, or through the Motorola Literature Distribution
Center.
MCCS and Mfax are trademarks of Motorola, Inc.
1/97
Motorola, Inc. 1997
Complies With SCSI and SCSI-2 Standards
Pin Compatible With UC5609
For Opposite Disconnect Polarity See Motorola’s MCCS142236
18 Switchable 110 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 (150 A Max)
–650mA Source Current
Thermal Shutdown Protection
Thin Profile Surface Mount Package: 28-Lead SOIC
The MCCS142238 is a precision 18-bit switchable active SCSI-2 bus
When the Disconnect pin is LOW, the device outputs are in the high
The regulator has a guaranteed dropout voltage of less than 900mV, allowing regulation of supply voltages less than 4.0V. The
In 8-bit SCSI applications (“A” cable), only one MCCS142238 is needed at each end of the SCSI cable in order to terminate the
For information on “Power Dissipation for Active SCSI Terminators,” refer to Motorola Application Note AN1408/D, available
5% precision resistor pull-ups to a 2.85V reference for termination
TRUTH TABLE
Disconnect
1
0
1
Terminated
Output
Z
REV 2
MCCS142238
18-BIT SWITCHABLE
28–LEAD WIDE SOIC PACKAGE
BUS TERMINATOR
ACTIVE SCSI-2
CASE 751F-04
DW SUFFIX

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MCCS142238DWR2 Summary of contents

Page 1

MOTOROLA SEMICONDUCTOR TECHNICAL DATA 18 Bit Switchable Active SCSI 2 Bus Terminator (110 ) 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 ...

Page 2

MCCS142238 Disconnect Input Application A. No Connection to Disconnect B. Single Pole Switch to GND C. Double Pole Switch Between Supply and GND D. Hardwired “High” E. Hardwired “Low” MAXIMUM RATINGS* Symbol Termpwr DC Supply Voltage V Line Signal Line ...

Page 3

RECOMMENDED OPERATING CONDITIONS Symbol Termpwr DC Supply Voltage Input Voltage (Disconnect Pin) V Line Signal Line Voltage T A Operating Temperature Range Input Rise/Fall Time ELECTRICAL CHARACTERISTICS (Unless otherwise stated, these specifications ...

Page 4

MCCS142238 Termpwr 50k Thermal Shutdown Enable Logic Disconnect Termpwr Reg Disconnect MCCS142238 Line 18 Line 1 TO RECEIVERS BUS DRIVER TO RECEIVERS BUS DRIVER Figure 3. Typical SCSI Bus Configuration Using the MCCS142238 Reg MOTOROLA Shunt Control + Voltage – ...

Page 5

- 0.010 (0.25 Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding ...

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