- 您现在的位置：买卖IC网 > PDF目录9527 > DS276+ (Maxim Integrated Products)IC TXRX LO-PWR DPLX RS232 8-DIP PDF资料下载
参数资料
| 型号： | DS276+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 5/11页 |
| 文件大小： | 0K |
| 描述： | IC TXRX LO-PWR DPLX RS232 8-DIP |
| 标准包装： | 50 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 1/1 |
| 规程： | RS232 |
| 电源电压： | 2.7 V ~ 5.5 V |
| 安装类型： | 通孔 |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-PDIP |
| 包装： | 管件 |
DS276
3 of 11
feet. As a prime example, the DS276 will not meet the RS-232 requirement that the signal levels be at
least
±5 volts minimum when terminated by a 3 k=load and V
DRV+ = +3-5 volts. Typically 2.5 to 4 volts
will be present at TXOUT when spacing under this condition, depending on the supply voltage. However,
since most RS-232 receivers will correctly interpret any voltage over 2 volts as a space, there will be no
problem transmitting data.
DS276 BLOCK DIAGRAM Figure 1
APPLICATIONS INFORMATION
The DS276 is designed as a low-cost, RS-232-E interface expressly tailored for the unique requirements
of battery-operated handheld products. As shown in the electrical specifications, the DS276 draws
exceptionally low operating and static current. During normal operation when data from the handheld
system is sent from the TXOUT output, the DS276 only draws significant VDRV+ current when TXOUT
transitions positively (spacing). This current flows primarily into the RS-232 receiver’s 3-7 k
=load at
the other end of the attaching cable. When TXOUT is marking (a negative data signal), the VDRV+ current
falls dramatically since the negative voltage is provided by the transmit signal from the other end of the
cable. This represents a large reduction in overall operating current, since typical RS-232 interface chips
use charge-pump circuits to establish both positive and negative levels at the transmit driver output. To
obtain the lowest power consumption from the DS276, observe the following guidelines: First, to
minimize VDRV+ current when connected to an RS-232 port, always maintain TXIN at a logic 1 when data
is not being transmitted (idle state). This will force TXOUT into the marking state, minimizing VDRV+
current. Second, VDRV+ current will drop significantly when VCC is grounded. Therefore, if VDRV+ is
derived independently from VCC (for example connected to a 9V battery), the logic supply voltage can be
turned off to achieve the lowest possible power state.
FULL-DUPLEX OPERATION
The DS276 is intended for full-duplex operation using the full-duplex circuit shown in Figure 4 to
generate a negative rail from RXIN. The 22
F capacitor forms a negative-charge reservoir; consequently,
when the TXD line RXIN 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
).
SUPPLY VOLTAGE OPTIONS
The DS276 is intended primarily for use in single supply 3- or 5- volts systems. However, several supply
configurations are possible.
3V OPERATION
The simplest configuration is to use a single 3V supply for VCC and Vdrv+, and connect Vdrv- to ground.
This will result in the lowest power consumption and will give adequate serial communication between
相关PDF资料 |
PDF描述 |
|---|---|
| MS27505E21B41PA | CONN RCPT 41POS BOX MNT W/PINS |
| MS27656T23A2S | CONN RCPT 85POS WALL MNT W/SCKT |
| VE-B7K-MY-S | CONVERTER MOD DC/DC 40V 50W |
| DS275SN+ | IC TXRX LINE-PWR RS232 8-SOIC |
| MS27656E23A2S | CONN RCPT 85POS WALL MNT W/SCKT |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS276+ | 功能描述:RS-232接口集成电路 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: |
| DS2760 | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:High Precision Li-Ion Battery Monitor |
| DS2760AE | 功能描述:IC BATT MON LI-ION HP 16-TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:1 系列:- 功能:充电管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:3.75 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:剪切带 (CT) 产品目录页面:669 (CN2011-ZH PDF) 其它名称:MCP73831T-2ACI/OTCT |
| DS2760AE/T&R | 制造商:Maxim Integrated Products 功能描述:IC BATT MON LI-ION HP 16-TSSOP |
| DS2760AE/T&R | 功能描述:IC BATT MON LI-ION HP 16-TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:1 系列:- 功能:充电管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:3.75 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:剪切带 (CT) 产品目录页面:669 (CN2011-ZH PDF) 其它名称:MCP73831T-2ACI/OTCT |
发布紧急采购，3分钟左右您将得到回复。