MAX3238E

3.0V to 5.5V, 10nA, 250kbps RS-232 Transceivers with 짹15kV ESD-Protected I/O and Logic Pins

GeneralDescription TheMAX3238E/MAX3248EtransceiversuseMaxim’srevolutionaryAutoShutdownPlus™featuretoachieve10nAsupplycurrent.Thesedevicesshutdowntheonboardpowersupplyanddriverswhentheydonotsenseavalidsignaltransitiononeitherthereceiverortransmitterinputs.

MAX3238E

3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER WITH ±15-kV ESD (HBM) PROTECTION

FEATURES RS-232Bus-PinESDProtectionExceeds ±15kVUsingHuman-BodyModel(HBM) MeetsorExceedstheRequirementsof TIA/EIA-232-FandITUv.28Standards OperatesWith3-Vto5.5-VVCCSupply Operatesupto400kbit/s FiveDriversandThreeReceivers Auto-PowerdownPlusFeatureEnables

MAX3238E

+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; • 对RS-232 I/O引脚和所有逻辑引脚提供增强型ESD保护\n• ±15kV——人体模型\n\n• ±8kV——IEC 1000-4-2接触放电\n\n• ±15kV——IEC 1000-4-2气隙放电\n\n\n\n\n• 支持的数据速率：250kbps\n\n• 接收器处于活动状态时关断功耗低至10nA\n\n• 所有输入均提供施密特触发器\n\n• 直通式引脚排列\n\n• 符合低至3.0V的EIA/TIA-232规范\n\n• 支持6V/µs摆率\n\n• 低电平逻辑阈值(MAX3248E)\n\n• RS-232兼容输出至2.7V;

MAX3238E/MAX3248E收发器使用Maxim开创性的AutoShutdown Plus™功能，可实现10nA的电源电流。当这些器件未在接收器或发射器输入端检测到有效信号转换时，会关闭板载电源和驱动器。如果RS-232电缆断开连接或所连外设的发射器关闭，都会出现这种情况。若对任何RS-232接收器或发射器输入进行有效转换，器件会再次开启。利用AutoShutdown Plus技术，无需更改现有的BIOS或操作系统，通过其板载电路即可自动实现节能。\n\n 所有RS-232输入和输出以及逻辑I/O引脚，均受到±15kV的增强ESD保护。逻辑I/O引脚上提供额外的ESD保护，无需昂贵的外部TransZorb™或保护方案，使得MAX3238E/MAX3248E非常适合手机数据线应用。\n\n MAX3238E/MAX3248E包含五个驱动器和三个接收器，均为3V电源供电的EIA/TIA-232和V.28/V.24通信接口，适用于手机、数据线和调制解调器应用。专有的高效双电荷泵电源与低压降发射器相结合，采用+3.0V至+5.5V单电源供电，提供真正的RS-232性能。该器件支持250kbps的数据速率，与常用软件兼容，可用于与个人计算机通信。\n\n MAX3238E和MAX3248E仅输入逻辑阈值不同。MAX3238E具有标准逻辑阈值，而MAX3248E具有0.6V至1.2V的低电平逻辑阈值，非常适合1.8V系统。\n\n 发送器输入FORCEON和低电平有效FORCEOFF具有一个400 kΩ有源正反馈电阻。这些输入驱动到有效逻辑电平后，如果驱动信号被移除或变为高阻态，输入将保持该电平。未使用的发射器和逻辑输入可以悬空。MAX3238E/MAX3248E支持+3.0V至+5.5V的电源电压范围。\n\n  \n\n

MAX3238E

具有 +/-15kV IEC-ESD 保护的 3V 至 5.5V 多通道 400kbps RS-232 线路驱动器/接收器; • RS-232 Bus-Pin ESD Protection Exceeds ±15 kV Using Human-Body Model (HBM)\n• Meets or Exceeds the Requirements of TIA/EIA-232-F and ITU v.28 Standards\n• Operates With 3-V to 5.5-V VCC Supply\n• Operates up to 400 kbit/s\n• Five Drivers and Three Receivers\n• Auto-Powerdown Plus Feature Enables Flexible Power-Down Mode\n• Low Standby Current . . . 1 µA Typical\n• External Capacitors . . . 4 × 0.1 µF\n• Accepts 5-V Logic Input With 3.3-V Supply\n• Always-Active Noninverting Receiver Output (ROUT1B)\n• Alternative High-Speed Pin-Compatible Device (1 Mbit/s) for SNx5C3238\n• ESD Protection for RS-232 Interface Pins \n• ±15 kV - Human-Body Model (HBM)\n• ±8 kV - IEC61000-4-2, Contact Discharge\n• ±15 kV - IEC61000-4-2, Air-Gap Discharge\n \n• APPLICATIONS \n• Battery-Powered Systems\n• PDAs\n• Notebooks\n• Subnotebooks\n• Laptops\n• Palmtop PCs\n• Hand-Held Equipment\n• Modems\n• Printers;

The MAX3238E consists of five line drivers, three line receivers, and a dual charge-pump circuit with ±15-kV ESD (HBM) protection on the driver output (DOUT) and receiver input (RIN) terminals. The device meets the requirements of TIA/EIA-232-F and provides the electrical interface between notebook and subnotebook computer applications. The charge pump and four small external capacitors allow operation from a single 3-V to 5.5-V supply. In addition, the device includes an always-active noninverting output (ROUT1B), which allows applications using the ring indicator to transmit data while the device is powered down. This device operates at data signaling rates up to 250 kbit/s and a maximum of 30-V/µs driver output slew rate. Flexible control options for power management are featured when the serial port and driver inputs are inactive. The auto-powerdown plus feature functions when FORCEON is low and FORCEOFF is high. During this mode of operation, if the device does not sense valid signal transitions on all receiver and driver inputs for approximately 30 s, the built-in charge pump and drivers are powered down, reducing the supply current to 1 µA. By disconnecting the serial port or placing the peripheral drivers off, auto-powerdown plus occurs if there is no activity in the logic levels for the driver inputs. Auto-powerdown plus can be disabled when FORCEON and FORCEOFF are high. With auto-powerdown plus enabled, the device activates automatically when a valid signal is applied to any receiver or driver input. INVALID is high (valid data) if any receiver input voltage is greater than 2.7 V or less than -2.7 V, or has been between -0.3 V and 0.3 V for less than 30 µs. INVALID is low (invalid data) if all receiver input voltages are between -0.3 V and 0.3 V for more than 30 µs.

MAX3238E

3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER WITH 짹15-kV ESD (HBM) PROTECTION

MAX3238E

LINE DRIVER/RECEIVER WITH ESD (HBM) PROTECTION

MAX3238EAI

3.0V to 5.5V, 1關A, up to 250kbps, True RS-232 Transceiver with AutoShutdown Plus?

GeneralDescription TheMAX3238trueRS-232transceiverachievesa1µAsupplycurrentwithMaxim’srevolutionaryAutoShutdownPlus™feature.Whenthedevicedoesnotsenseavalidsignaltransitiononeitherthereceiverortransmitterinputswithin30sec,theon-boardpowersupplyanddriverssh

MAX3238EAI

3.0V to 5.5V, 1μA, up to 250kbps, True RS-232 Transceiver with AutoShutdown Plus

GeneralDescription TheMAX3238trueRS-232transceiverachievesa1µAsupplycurrentwithMaxim’srevolutionaryAutoShutdownPlus™feature.Whenthedevicedoesnotsenseavalidsignaltransitiononeitherthereceiverortransmitterinputswithin30sec,theon-boardpowersupplyanddriverssh

MAX3238ECAI

3.0V to 5.5V, 10nA, 250kbps RS-232 Transceivers with 짹15kV ESD-Protected I/O and Logic Pins

GeneralDescription TheMAX3238E/MAX3248EtransceiversuseMaxim’srevolutionaryAutoShutdownPlus™featuretoachieve10nAsupplycurrent.Thesedevicesshutdowntheonboardpowersupplyanddriverswhentheydonotsenseavalidsignaltransitiononeitherthereceiverortransmitterinputs.

MAX3238ECDBR

丝印：MAX3238EC；Package：SSOP；3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER WITH ±15-kV ESD (HBM) PROTECTION

FEATURES RS-232Bus-PinESDProtectionExceeds ±15kVUsingHuman-BodyModel(HBM) MeetsorExceedstheRequirementsof TIA/EIA-232-FandITUv.28Standards OperatesWith3-Vto5.5-VVCCSupply Operatesupto400kbit/s FiveDriversandThreeReceivers Auto-PowerdownPlusFeatureEnables