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參數(shù)資料
| 型號： | DS276 |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 5/11頁 |
| 文件大小： | 0K |
| 描述： | IC TXRX LO-PWR DPLX RS232 8-DIP |
| 標(biāo)準(zhǔn)包裝： | 50 |
| 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： | 2.7 V ~ 5.5 V |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 8-DIP（0.300"，7.62mm） |
| 供應(yīng)商設(shè)備封裝： | 8-PDIP |
| 包裝： | 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
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| DS276+ | 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: |
| DS2760 | 制造商:DALLAS 制造商全稱: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 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 功能:充電管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:3.75 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應(yīng)商設(shè)備封裝:SOT-23-5 包裝:剪切帶 (CT) 產(chǎn)品目錄頁面:669 (CN2011-ZH PDF) 其它名稱: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 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 功能:充電管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:3.75 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應(yīng)商設(shè)備封裝:SOT-23-5 包裝:剪切帶 (CT) 產(chǎn)品目錄頁面:669 (CN2011-ZH PDF) 其它名稱:MCP73831T-2ACI/OTCT |
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