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MCCS142236 데이터시트 PDF




ON Semiconductor에서 제조한 전자 부품 MCCS142236은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 MCCS142236 기능
기능 18-Bit Switchable Active SCSI-2 Bus Terminator
제조업체 ON Semiconductor
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MCCS142236 데이터시트, 핀배열, 회로
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




MCCS142236 pdf, 반도체, 판매, 대치품
Termpwr
MCCS142236
Reg
Disconnect
50kΩ
+
Thermal
Shutdown
Shunt
Control
Voltage
Reference
Enable
Logic
Charge
Pump
Figure 2. MCCS142236 Block Diagram
110Ω
Line 1
110Ω
Line 18
PATENTED CIRCUIT
DESIGN
TO
RECEIVERS
TO
RECEIVERS
Termpwr
Disconnect
Reg
MCCS142236
Line 18
Line 1
2.2μF 2.2μF
2.2μF 2.2μF
0.1μF
0.1μF
Termpwr
Reg
Disconnect
MCCS142236
Line 1
Line 18
BUS DRIVER
BUS DRIVER
BUS DRIVER
SCSI
CABLE
BUS DRIVER
Figure 3. Typical SCSI Bus Configuration Using the MCCS142236
TO
RECEIVERS
TO
RECEIVERS
30Ω Terminated
Reg 80Ω
Output
4.0pF
High Impedance
Figure 4. Output Impedance Model
http://onsemi.com
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