DS21T09 查看數據表（PDF） - Dallas Semiconductor -> Maxim Integrated

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DS21T09

Plug and Play SCSI Terminator

Dallas Semiconductor -> Maxim Integrated 

The DS21T09 consists of three major functional blocks, Figure 2:

DS21T09

• Voltage reference, terminating resistors, and isolation switches

• Bus current sensing circuitry

• Bus ground sensing circuitry

When the Bus Ground Sensing Circuitry or Bus Current Sensing Circuitry determines that the SCSI bus

is properly terminated without the DS21T09, the power-down buffer isolates the resistors from the SCSI

bus and disables the power amp, thereby placing the DS21T09 in a low power mode (the bus sensing

circuitry always stays active). The PDO (Power-Down Output) pin can be connected to the pin of a

DS21T07 SCSI terminator for Wide SCSI configurations, Figure 8.

DS21T09 BLOCK DIAGRAM Figure 2

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