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Motorola Electronic Components Datasheet

MCCS142238 Datasheet

18-Bit Switchable Active SCSI-2 Bus Terminator

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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


Motorola Electronic Components Datasheet

MCCS142238 Datasheet

18-Bit Switchable Active SCSI-2 Bus Terminator

No Preview Available !

MCCS142238
Disconnect 1
28 GND
Line1 2
27 Line18
Line2 3
26 Line17
Line3 4
25 Line16
Line4 5
24 Line15
Line5 6
23 Line14
GND 7 MCCS142238 22 GND
GND 8
21 GND
GND 9
20 GND
Line6 10
19 Line13
Line7 11
18 Line12
Line8 12
17 Line11
Line9 13
16 Line10
Termpwr 14
15 Reg
Figure 1. 28-Lead Pinout (Top View)
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”
Result
Disconnect input will be pulled “HIGH” internally, providing 110
impedance to each of the bus lines.
Disconnect input will be pulled “HIGH” internally when the switch is open,
providing 110impedance to each of the bus lines.
Disconnect input will be held “LOW” when the switch is closed, causing
all outputs to be high impedance.
This is a more expensive way to accomplish application B above. It is
more economical to allow the internal pullup to provide the “HIGH” input
level. The supply source in this case could be Termpwr or VCC.
The MCCS142238 will be permanently connected providing 110
impedance to each of the bus lines.
The MCCS142238 will be permanently disconnected causing all outputs
to be high impedance.
MAXIMUM RATINGS*
Symbol
Parameter
Value
Unit
Termpwr
DC Supply Voltage
7.0 V
VLine
Signal Line Voltage
–1.0 to +7.0
V
IREG
Regulator Current
1A
tstg Storage Temperature Range
–65 to +150
°C
* Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the
Recommended Operating Conditions.
MOTOROLA
2 SCSI TERMINATORS
BR1486


Part Number MCCS142238
Description 18-Bit Switchable Active SCSI-2 Bus Terminator
Maker Motorola
Total Page 5 Pages
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