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參數(shù)資料
| 型號： | S21S07ACTR |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | SCSI TERMINATOR |
| 中文描述： | SCSI端接 |
| 文件頁數(shù)： | 4/10頁 |
| 文件大?。?/td> | 177K |
| 代理商： | S21S07ACTR |
ST21S07A
4/10
FUNCTIONAL DESCRIPTION
The ST21S07A consists of a bandgap reference,
buffer amplifier, and nine termination resistors
Figure 1). The bandgap reference circuit produces
a precise 1.25V level which is fed to a buffer
amplifier. The buffer produce a 2.85V level and is
capable of sourcing at least 24mA into each of the
termination resistors when the signal line is low
(active). When the driver for a given signal line
turns off, the terminator will pull the signal line to
2.85V (quiescent state). To handle actively
negated SCSI signals, the buffer can sink 200mA.
When all lines settle in the quiescent state, the
regulator will consume about 1.5mA. When the
ST21S07A is put into power-down mode by
bringing PD low, the power-down circuitry will turn
off the transistors on each signal line. This will
isolated the ST21S07A from the signal lines and
effectively remove it from the circuit. The
power-down pin (PD) has an internal pull-up
resistor.To place the ST21S07A into an active
state, the PD pin should be left open circuited.
To ensure proper operation, both the TERMPWR1
and TERMPWR2 pins must be connected to the
SCSI bus TREMPWR line and both the VREF1
and VREF2 pins must be tied together externally.
Each ST21S07A requires a 4.7
μ
F capacitor
connected between the VREF pins and ground.
Figure 2 details a typical SCSI bus configuration.
In an 8-bit wide SCSI bus arrangement ("A"
Cable), two ST21S07A’s would be needed at each
end of the SCSI cable in order to terminate the 18
active signal lines. In a 16-bit SCSI bus
arrangement ("P" Cable), three ST21S07A’s
would be need at each end of the SCSI cable in
order to terminate the 27 active signal lines.
Figure 1 :
Block Diagram
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