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| 型号： | DS275S/T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 4/8页 |
| 文件大小： | 0K |
| 描述： | IC TXRX LINE-PWR RS232 IND 8SOIC |
| 标准包装： | 2,500 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 1/1 |
| 规程： | RS232 |
| 电源电压： | 4.5 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
DS275
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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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