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參數資料
| 型號： | DS2108S+T&R |
| 廠商： | Maxim Integrated Products |
| 文件頁數： | 3/5頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TERM SCSI DIFF/SWITCH 24-SOIC |
| 標準包裝： | 1,000 |
| 類型： | SCSI，HVD，SE |
| 端子數： | 9 |
| 電源電壓： | 4 V ~ 5.25 V |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-SOIC（0.295"，7.50mm 寬） |
| 供應商設備封裝： | 24-SOIC W |
| 包裝： | 帶卷 (TR) |
DS2108
3 of 5
TYPICAL DIFFERENTIAL SCSI BUS CONFIGURATION Figure 2
NOTES:
1. Two DS2108s required per 8–bit SCSI device and three DS2108s per 16–bit SCSI device.
2. Mid–bus termination effectively removed by grounding PD pin.
3. Termination power to be provided as specified in SCSI–3 Parallel Interface (SPI) document.
4. Local TERMPWR bypassing is recommended by the SPI document with values shown. The bypass
capacitors should be located as close as possible to the DS2108s. Only one pair of capacitors is
required per SCSI device (may be shared between DS2108s on same device).
PIN DESCRIPTION Table 1
PIN
SYMBOL
DESCRIPTION
1, 11
TPWR
Termination Power. Should be connected to the SCSI TERMPWR line.
Bypass with a 2.2 F cap in parallel with a 0.1 F cap as shown in Figure
2.
2, 3, 4, 5, 6,
7, 8, 9, 10
R1N…R9N
Signal Termination Negative. Connect to –SIGNAL of SCSI bus.
12
NC
No Connect. Do not connect any signal to this pin.
13, 23
GND
Ground. Signal ground; 0.0V.
14, 15, 16,
17, 18, 19,
20, 21, 22
R1P…R9P
Signal Termination Positive. Connect to +SIGNAL of SCSI bus.
24
PD
Power Down. When tied low, the DS2108 enters a power-down mode.
Contains an internal 50K pull-up. Strap low to deactivate the DS2108,
leave open circuited to activate the DS2108.
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