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参数资料
| 型号： | DS275 |
| 元件分类： | RS-232 |
| 英文描述： | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| 中文描述： | 5V的高速RS - 232收发器与0.1uF电容 |
| 文件页数： | 4/8页 |
| 文件大小： | 126K |
| 代理商： | DS275 |
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
μ
F capacitor forms a negative-charge reservoir; consequently, when the TXD line is
spacing (positive), TX
OUT
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 TX
OUT
signal. Note
that the SN75154 can have a marking input threshold below ground; hence there is the need for TX
OUT
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 TX
OUT
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 TX
OUT
is still marking) at a time constant determined by its value and the value of the load
resistance reflected back to TX
OUT
. 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*
V
CC
-0.3 to +7.0 volts
V
DRV
-0.3 to +13.0 volts
相关PDF资料 |
PDF描述 |
|---|---|
| DS275E | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| DS275S | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| DS2906SZ | Rectifier Diode |
| DS2906SZ35 | Rectifier Diode |
| DS2906SZ36 | Rectifier Diode |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS275+ | 功能描述:RS-232接口集成电路 Line-Powered RS-232 Transceiver Chip RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
| DS2751 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Multichemistry Fuel Garge |
| DS2751+ | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Multichemistry Fuel Garge |
| DS2751+025 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Multichemistry Fuel Garge |
| DS2751-025 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Multichemistry Fuel Garge |
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