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參數(shù)資料
| 型號(hào)： | DS275S+ |
| 廠商： | Maxim Integrated Products |
| 文件頁(yè)數(shù)： | 4/8頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC TXRX LINE-PWR RS232 8-SOIC |
| 標(biāo)準(zhǔn)包裝： | 100 |
| 類型： | 收發(fā)器 |
| 驅(qū)動(dòng)器/接收器數(shù)： | 1/1 |
| 規(guī)程： | RS232 |
| 電源電壓： | 4.5 V ~ 5.5 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SOIC |
| 包裝： | 管件 |
DS275
4 of 8
problem that may occur in this case is if the receiver at the other end requires a negative voltage for
recognizing a mark. In this situation, the full-duplex circuit shown in Figure 3 can be used as
analternative. The 22
F capacitor forms a negative-charge reservoir; consequently, when the TXD line is
spacing (positive), TXOUT still has a negative source available for a time period determined by the
capacitor and the load resistance at the other end (3-7 k
). This circuit was tested from 150-19,200 bps
with error-free operation using a SN75154 Quad Line Receiver as the receiver for the TXOUT signal. Note
that the SN75154 can have a marking input threshold below ground; hence there is the need for TXOUT to
swing both positive and negative in full-duplex operation with this device.
HANDHELD RS-232-C APPLICATION USING A STEREO MINI-JACK Figure 2
FULL-DUPLEX CIRCUIT USING NEGATIVE-CHARGE STORAGE Figure 3
NOTE:
The capacitor stores negative charge whenever the TXD signal from the PC serial port is in a marking
data state (a negative voltage that is typically -10 volts). The top DS275’s TXOUT uses this negative
charge reservoir when it is in a marking state. The capacitor will discharge to 0 volts when the TXD line
is spacing (and TXOUT is still marking) at a time constant determined by its value and the value of the load
resistance reflected back to TXOUT. However, when TXD is marking the capacitor will quickly charge
back to -10 volts. Note that TXD remains in a marking state when idle, which improves the performance
of this circuit.
ABSOLUTE MAXIMUM RATINGS*
VCC
-0.3 to +7.0 volts
VDRV
-0.3 to +13.0 volts
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS275S/T&R | 制造商:Maxim Integrated Products 功能描述:IC TXRX LINE-PWR RS232 IND 8SOIC |
| DS275S/T&R | 功能描述:RS-232接口集成電路 RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| DS275S+ | 功能描述:RS-232接口集成電路 Line-Powered RS-232 Transceiver Chip RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
| DS275S+T&R | 制造商:Maxim Integrated Products 功能描述:IC TXRX LINE-PWR RS232 8-SOIC |
| DS275S+T&R | 功能描述:RS-232接口集成電路 Line-Powered RS-232 Transceiver Chip RoHS:否 制造商:Exar 數(shù)據(jù)速率:52 Mbps 工作電源電壓:5 V 電源電流:300 mA 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:LQFP-100 封裝: |
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