MAX3248E

+3.0V至+5.5V、10nA、250kbps RS-232收发器,带有±15kV ESD保护、输入/输出和逻辑引脚


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说明

The MAX3238E/MAX3248E transceivers use Maxim's revolutionary AutoShutdown Plus™ feature to achieve 10nA supply current. These devices shut down the on-board power supply and drivers when they do not sense a valid signal transition on either the receiver or transmitter inputs. This occurs if the RS-232 cable is disconnected or if the transmitters of the connected peripheral are turned off. The devices turn on again when a valid transition is applied to any RS-232 receiver or transmitter input. AutoShutdown Plus automatically achieves this power savings through its on-board circuitry, as no changes are required to the existing BIOS or operating system.

All RS-232 inputs and outputs, as well as the logic I/O pins, have enhanced ESD protection to ±15kV. The additional ESD protection on the logic I/O pins makes the MAX3238E/MAX3248E ideal for cell phone data cable applications because it eliminates the need for costly external TransZorb™ or protection schemes.

The MAX3238E/MAX3248E contain five drivers and three receivers and are 3V-powered EIA/TIA-232 and V.28/V.24 communication interfaces intended for cell phones, data cables, and modem applications. A proprietary, high-efficiency, dual charge-pump power supply and a low-dropout transmitter combine to deliver true RS-232 performance from a single +3.0V to +5.5V supply. A guaranteed data rate of 250kbps provides compatibility with popular software for communicating with personal computers.

The MAX3238E and the MAX3248E differ only in their input logic thresholds. The MAX3238E has standard logic thresholds, while the MAX3248E has low-level logic thresholds of 0.6V to 1.2V, which are ideal for 1.8V systems.

The transmitter inputs, FORCEON, and active-low FORCEOFF have a 400 kilohms active positive feedback resistor. Once driven to a valid logic level, they will retain this level if the driving signal is removed or goes high impedance. Unused transmitter and logic inputs may be left unconnected. The MAX3238E/MAX3248E can operate with supply voltages ranging from +3.0V to +5.5V.
MAX3238E、MAX3248E:典型工作电路 MAX3238E、MAX3248E:典型工作电路 放大+

关键特性

  • Enhanced ESD Protection on RS-232 I/O Pins and All Logic Pins
    • ±15kV—Human Body Model
    • ±8kV—IEC 1000-4-2 Contact Discharge
    • ±15kV—IEC 1000-4-2 Air-Gap Discharge
  • Guaranteed Data Rate: 250kbps
  • 10nA Low-Power Shutdown with Receivers Active
  • Schmitt Triggers on All Inputs
  • Flow-Through Pinout
  • Meets EIA/TIA-232 Specifications Down to 3.0V
  • Guaranteed 6V/µs Slew Rate
  • Low-Level Logic Thresholds (MAX3248E)
  • RS-232-Compatible Outputs to 2.7V

应用

  • 电池供电应用
  • 蜂窝数据电缆
  • 数据托架
  • 调制解调器
  • 外设
  • 打印机
Part NumberVSUPPLY
(V)
TxRxData Rate
(kbps)
ICC
(mA)
Internal Charge PumpExt. CapsCap. Value
(µF)
ESD Protect.
(±kV)
Rx Active in ShutdnPackage/PinsBudgetary
Price
mintypnomSee Notes
MAX3238E 
3.3
5
532500.5Yes40.1150
SSOP/28
$2.25 @1k
MAX3248E 
SSOP/28
-
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Pricing Notes:
价格仅供参考,用于同类产品的比较。所提供报价为美元,需要依汇率折合成人民币。该价格将因当地关税、税率和汇率而异。有关特定订购量和指定版本的报价和供货问题,请参考:价格与供货网站或与指定代理商联系。

技术资料

设计指南 2141 Determining Clock Accuracy Requirements for UART Communications
应用笔记 882 RS-232 Features Explained
设计指南 739 Design Considerations for Data-Lump Cables

质量和环境数据

申请可靠性报告: MAX3248E 
无铅封装的锡(Sn)晶须报告

其它资源

RS-232资源

CAD Symbols and Footprints

  • MAX3248EEAI+
  • 型号   生产流程   工艺   样本量   不合格   FIT @ 25°C   FIT @ 55°C  

    备注: 通过技术手段对故障率进行汇总,并映射到相关的材料部件号。 故障率与被测件的数量密切相关。

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