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參數(shù)資料
| 型號： | DS21S07CE |
| 英文描述： | Interface IC |
| 中文描述： | 接口IC |
| 文件頁數(shù)： | 2/7頁 |
| 文件大?。?/td> | 84K |
| 代理商： | DS21S07CE |
DS21S07A
022798 2/7
FUNCTIONAL DESCRIPTION
The DS21S07A consists of a bandgap reference, buffer
amplifier, and nine termination resistors (Figure 1). The
bandgap reference circuit produces a precise 2.55V
level which is fed to a buffer amplifier. The buffer pro-
duces a 2.85V level and is capable of sourcing at least
24 mA 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 at least 200 mA, and
V
REF
will move less than 60 mV. When all lines settle in
the quiescent state, the regulator will consume about
2.5 mA. When the DS21S07A 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 iso-
late the DS21S07A from the signal lines and effectively
remove it from the circuit. The power–down pin (PD)
has an internal 50K
pull–up resistor. To place the
DS21S07A into an active state, the PD pin should be left
open circuited. When installed on disk drives or RAID
system components, the DS21S07A will not affect the
SCSI bus during a hot plug operation.
To ensure proper operation, both the TERMPWR1 and
TERMPWR2 pins must be connected to the SCSI bus
TERMPWR line and both the VREF1 and VREF2 pins
must be tied together externally. Each DS21S07A re-
quires 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 DS21S07A’s would be needed at each
end of the SCSI cable in order to terminate the 18 active
signal lines. In a 16–bit wide SCSI bus arrangement
(“P” Cable), three DS21S07A’s would be needed at
each end of the SCSI cable in order to terminate the 27
active signal lines.
DS21S07A BLOCK DIAGRAM
Figure 1
GND
TERMPWR1
TERMPWR2
PD
Power
Down
Circuitry
50K Ohm
Bandgap
Reference
110 Ohms
R1
R2
R3
R4
R5
R6
R7
R8
R9
VREF1
VREF2
110 Ohms
110 Ohms
110 Ohms
110 Ohms
110 Ohms
110 Ohms
110 Ohms
110 Ohms
+
–
相關PDF資料 |
PDF描述 |
|---|---|
| DS21S07CS | Interface IC |
| DS21T05S | Terminator |
| DS21T05Z | Terminator |
| DS21T07E | Terminator |
| DS21T07S | Terminator |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| DS21S07CS | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Interface IC |
| DS21T05 | 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:SCSI Terminator |
| DS21T05S | 功能描述:SCSI 接口集成電路 RoHS:否 制造商:Texas Instruments 工作電源電壓:2.7 V to 5.25 V 電源電流:13 mA 最大工作溫度:+ 70 C 最小工作溫度:0 C 安裝風格:SMD/SMT 封裝 / 箱體:SSOP-36 封裝:Tube |
| DS21T05S/T&R | 制造商:Maxim Integrated Products 功能描述:IC TERMINATOR SCSI 300MIL 16SOIC |
| DS21T05S/T&R | 功能描述:SCSI 接口集成電路 RoHS:否 制造商:Texas Instruments 工作電源電壓:2.7 V to 5.25 V 電源電流:13 mA 最大工作溫度:+ 70 C 最小工作溫度:0 C 安裝風格:SMD/SMT 封裝 / 箱體:SSOP-36 封裝:Tube |
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