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MAX3238

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

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

MAX3238

+3.0V至+5.5V、1μA、高達(dá)250kbps、真RS-232收發(fā)器，提供AutoShutdown Plus; ? 利用AutoShutdown Plus模式實(shí)現(xiàn)1μA電源電流\n\n? 支持的數(shù)據(jù)速率：250kbps\n\n? 低功耗關(guān)斷：1μA\n\n? 接收器在AutoShutdown Plus模式下保持有效\n\n? 直通式引腳排列\(zhòng)n\n? 符合低至3.0V的EIA/TIA-232規(guī)范\n\n? 支持6V/μs擺率\n\n? 通過自動(dòng)關(guān)斷將電源電流降至1uA;

MAX3238真正的RS-232收發(fā)器采用Maxim開創(chuàng)性的AutoShutdown Plus?功能，可實(shí)現(xiàn)1μA的電源電流。當(dāng)器件在30秒內(nèi)未檢測(cè)到接收器或發(fā)射器輸入的有效信號(hào)轉(zhuǎn)換時(shí)，板載電源和驅(qū)動(dòng)器將關(guān)閉。如果RS-232電纜斷開連接或所連外設(shè)的發(fā)射器處于非活動(dòng)狀態(tài)，都會(huì)出現(xiàn)這種情況。當(dāng)對(duì)任何RS-232接收器或發(fā)射器輸入進(jìn)行有效轉(zhuǎn)換時(shí)，系統(tǒng)會(huì)再次開啟，從而無需更改現(xiàn)有的BIOS或操作系統(tǒng)也能實(shí)現(xiàn)節(jié)電。\n\n MAX3238 5驅(qū)動(dòng)器/3接收器完整串行端口是一款3V電源供電的EIA/TIA-232和V.28/V.24通信接口，適用于筆記本電腦或小型筆記本電腦應(yīng)用。專有的高效雙電荷泵電源與低壓降發(fā)射器相結(jié)合，采用+3.0V至+5.5V單電源供電，提供真正的RS-232性能。該器件支持250kbps的數(shù)據(jù)速率，與常用軟件兼容，可用于與個(gè)人計(jì)算機(jī)通信。MAX3238在3.3V工作電壓下僅需要0.1μF電容。它非常適合需要真正RS-232性能的純3.3V系統(tǒng)、3.3V和5.0V混合系統(tǒng)或純5V系統(tǒng)。\n\n 接收器R1具有一個(gè)額外的始終有效的輸出（除了其標(biāo)準(zhǔn)輸出外），能夠在已完全移除VCC的電路中對(duì)保護(hù)二極管未進(jìn)行正向偏置的情況下監(jiān)控外部器件（如調(diào)制解調(diào)器）。\n\n MAX3238采用節(jié)省空間的SSOP封裝。\n\n ?\n\n

MAX3238

具有 +/-15kV ESD 保護(hù)的 3V 至 5.5V 多通道 250kbps RS-232 線路驅(qū)動(dòng)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 250 kbit/s\n? Five Drivers and Three Receivers\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? Designed to Be Interchangeable With Maxim MAX3238\n? Alternative High-Speed Pin-Compatible Device (1 Mbit/s) \n? SNx5C3238\n \n? Applications \n? Battery-Powered Systems, PDAs, Notebooks, Subnotebooks, Laptops, Palmtop PCs, Hand-Held Equipment, Modems, and Printers;

The MAX3238 consists of five line drivers, three line receivers, and a dual charge-pump circuit with ±15-kV ESD (HBM) protection pin to pin (serial-port connection pins, including GND). 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. These devices operate at data signaling rates up to 250 kbit/s and a maximum of 30-V/μs driver output slew rate.\n\n 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 automatically activates once 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. Refer to Figure 5 for receiver input levels.

MAX3238

3-V TO 5.5-V MULTICHANNEL RS-232 LINE DRIVER/RECEIVER

MAX3238

MULTICHANNEL LINE DRIVER/RECEIVER WITH ESD PROTECTION

MAX3238

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

MAX3238CAI

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

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

MAX3238CAI

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

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

MAX3238CAI-T

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

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

MAX3238CDB

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

RS-232Bus-PinESDProtectionExceeds ±15kVUsingHuman-BodyModel(HBM) MeetsorExceedstheRequirementsof TIA/EIA-232-FandITUv.28Standards OperatesWith3-Vto5.5-VVCCSupply OperatesUpTo250kbit/s FiveDriversandThreeReceivers LowStandbyCurrent...1μATypical Extern