MAX3238

+3.0V至+5.5V、1µA、高达250kbps、真RS-232收发器,提供AutoShutdown Plus


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说明

The MAX3238 true RS-232 transceiver achieves a 1µA supply current with Maxim's revolutionary AutoShutdown Plus™ feature. When the device does not sense a valid signal transition on either the receiver or transmitter inputs within 30sec, the on-board power supply and drivers shut down. This occurs if the RS-232 cable is disconnected or if the transmitters of the connected peripheral are inactive. The system turns on again when a valid transition is applied to any RS-232 receiver or transmitter input, saving power without changes to the existing BIOS or operating system.

The MAX3238 5-driver/3-receiver complete serial port is a 3V-powered EIA/TIA-232 and V.28/V.24 communications interface intended for notebook or subnotebook computer 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 MAX3238 requires only 0.1µF capacitors in 3.3V operation. It is ideal for 3.3V-only systems, mixed 3.3V and 5.0V systems, or 5V-only systems that require true RS-232 performance.

Receiver R1 has an extra, always-active output (in addition to its standard output), which allows external devices, such as a modem, to be monitored without forward biasing the protection diodes in circuitry that may have VCC completely removed.

The MAX3238 is available in a space-saving SSOP package.
MAX3238:典型工作电路 MAX3238:典型工作电路 放大+

关键特性

  • 1µA Supply Current Achieved with AutoShutdown Plus
  • Guaranteed Data Rate: 250kbps
  • 1µA Low-Power Shutdown
  • Receivers Active in AutoShutdown Plus Mode
  • Flow-Through Pinout
  • Meets EIA/TIA-232 Specifications Down to 3.0V
  • Guaranteed 6V/µs Slew Rate
  • Auto shutdown reduces supply current to 1uA

应用

  • 电池供电应用
  • 手持式装置
  • 高速调制解调器
  • 笔记本电脑、亚笔记本电脑与掌上电脑
  • 外设
  • 打印机
Part NumberVSUPPLY
(V)
TxRxData Rate
(kbps)
ICC
(mA)
Internal Charge PumpExt. CapsCap. Value
(µF)
Rx Active in ShutdnPackage/PinsBudgetary
Price
mintypnomSee Notes
MAX3238 
3.3
5
532500.5Yes40.10
SSOP/28
$3.85 @1k
查看所有RS-232 Line Driver/Receivers (136)
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
设计指南 2020 Choosing the Right RS-232 Transceiver

质量和环境数据

产品可靠性报告: MAX3238.pdf 
无铅封装的锡(Sn)晶须报告

其它资源

RS-232资源

CAD Symbols and Footprints

  • MAX3238CAI
  • MAX3238CAI+
  • MAX3238CAI+T
  • MAX3238CAI-T
  • MAX3238EAI
  • MAX3238EAI+
  • MAX3238EAI+T
  • MAX3238EAI-T
  • MAX3238ECAI
  • MAX3238ECAI+
  • MAX3238ECAI+T
  • MAX3238ECAI-T
  • MAX3238EEAI
  • MAX3238EEAI+
  • MAX3238EEAI+T
  • MAX3238EEAI-T
  • 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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