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MCCS142236 Datasheet

18-Bit Switchable Active SCSI-2 Bus Terminator

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MCCS142236
18-Bit Switchable Active
SCSI-2 Bus Terminator
(110Ω)
With Voltage Regulator
The MCCS142236 is a precision 18bit switchable active SCSI2
bus terminator with an onboard 2.85V regulator. When the
Disconnect pin is LOW according to the truth table below, the
MCCS142236 provides 110Ω ±5% precision resistor pullups to a
2.85V reference for termination of 18bits in a SCSI2 standard bus
system interface.
When the Disconnect pin is HIGH, 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.
http://onsemi.com
18BIT SWITCHABLE
ACTIVE SCSI2
BUS TERMINATOR
Complies With SCSI and SCSI2 Standards
Pin Compatible With UC5601, UC5602 and UC5608
For Opposite Disconnect Polarity See ON Semiconductor’s
MCCS142238
18 Switchable 110Ω Terminating Resistors
4pF Channel Capacitance During Disconnect
Fully Supports Active Negation (Sinks Minimum of 220mA)
BuiltIn 2.85V Regulator With Low Dropout Voltage
Very Low Supply Current When Resistors Are Disabled (30μA Max)
650mA Source Current
Thermal Shutdown Protection
Thin Profile Surface Mount Package: 28Lead SOIC
DW SUFFIX
28LEAD SOIC WIDE
CASE 751F05
The regulator has a guaranteed dropout voltage of less than 900mV, allowing regulation of supply voltages less than 4.0V.
The MCCS142236 is protected by thermal shutdown. Other features include low disconnect current (30μA), over 220mA of
active negation current sink capability, and 4pF disconnect capacitance.
In 8bit SCSI applications (“A” cable), only one MCCS142236 is needed at each end of the SCSI cable in order to terminate
the 18 active signal lines. In 16bit WIDE SCSI applications (“P” cable), either two MCCS142236s, one each of the
MCCS142236 and MCCS142237, or three MCCS142237s would be needed at each end of the SCSI cable in order to properly
terminate the 27 active signal lines. The MCCS142237 is a 9bit version of the MCCS142236.
For information on “Power Dissipation for Active SCSI Terminators,” refer to ON Semiconductor Application Note
AN1408/D, available through ON Semiconductor Fax System, or through the ON Semiconductor Literature Distribution
Center.
TRUTH TABLE
Disconnect
0
1
Output
Terminated
Z
© Semiconductor Components Industries, LLC, 2010
February, 2010 Rev. 6
1
Publication Order Number:
MCCS142236/D


  ON Semiconductor Electronic Components Datasheet  

MCCS142236 Datasheet

18-Bit Switchable Active SCSI-2 Bus Terminator

No Preview Available !

MCCS142236
Disconnect
Line1
Line2
Line3
Line4
Line5
GND*
GND*
GND*
Line6
Line7
Line8
Line9
Termpwr
1 28 GND
2 27 Line18
3 26 Line17
4 25 Line16
5 24 Line15
6 23 Line14
7 MCCS142236 22 GND*
8 21 GND*
9 20 GND*
10 19 Line13
11 18 Line12
12 17 Line11
13 16 Line10
14 15 Reg
* Pins 7, 8, 9, 20, 21 and 22 are heat-sink grounds.
Pin 28 is the signal ground.
Figure 1. 28Lead 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, causing all outputs to
be high impedance.
Disconnect input will be pulled “HIGH” internally when the switch is
open, causing all outputs to be high impedance.
Disconnect input will be held “LOW” when the switch is closed,
providing 110Ω impedance to each of the bus lines.
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 MCCS142236 will be permanently disconnected causing all
outputs to be high impedance.
The MCCS142236 will be permanently connected providing 110Ω
impedance to each of the bus lines.
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.
http://onsemi.com
2


Part Number MCCS142236
Description 18-Bit Switchable Active SCSI-2 Bus Terminator
Maker ON Semiconductor
Total Page 5 Pages
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