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MAX3238E

3.0V to 5.5V, 10nA, 250kbps RS-232 Transceivers with ?15kV 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收發(fā)器，帶有±15kV ESD保護(hù)、輸入/輸出和邏輯引腳; ? 對(duì)RS-232 I/O引腳和所有邏輯引腳提供增強(qiáng)型ESD保護(hù)\n? ±15kV——人體模型\n\n? ±8kV——IEC 1000-4-2接觸放電\n\n? ±15kV——IEC 1000-4-2氣隙放電\n\n\n\n\n? 支持的數(shù)據(jù)速率：250kbps\n\n? 接收器處于活動(dòng)狀態(tài)時(shí)關(guān)斷功耗低至10nA\n\n? 所有輸入均提供施密特觸發(fā)器\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? 低電平邏輯閾值(MAX3248E)\n\n? RS-232兼容輸出至2.7V;

MAX3238E/MAX3248E收發(fā)器使用Maxim開(kāi)創(chuàng)性的AutoShutdown Plus?功能，可實(shí)現(xiàn)10nA的電源電流。當(dāng)這些器件未在接收器或發(fā)射器輸入端檢測(cè)到有效信號(hào)轉(zhuǎn)換時(shí)，會(huì)關(guān)閉板載電源和驅(qū)動(dòng)器。如果RS-232電纜斷開(kāi)連接或所連外設(shè)的發(fā)射器關(guān)閉，都會(huì)出現(xiàn)這種情況。若對(duì)任何RS-232接收器或發(fā)射器輸入進(jìn)行有效轉(zhuǎn)換，器件會(huì)再次開(kāi)啟。利用AutoShutdown Plus技術(shù)，無(wú)需更改現(xiàn)有的BIOS或操作系統(tǒng)，通過(guò)其板載電路即可自動(dòng)實(shí)現(xiàn)節(jié)能。\n\n 所有RS-232輸入和輸出以及邏輯I/O引腳，均受到±15kV的增強(qiáng)ESD保護(hù)。邏輯I/O引腳上提供額外的ESD保護(hù)，無(wú)需昂貴的外部TransZorb?或保護(hù)方案，使得MAX3238E/MAX3248E非常適合手機(jī)數(shù)據(jù)線應(yīng)用。\n\n MAX3238E/MAX3248E包含五個(gè)驅(qū)動(dòng)器和三個(gè)接收器，均為3V電源供電的EIA/TIA-232和V.28/V.24通信接口，適用于手機(jī)、數(shù)據(jù)線和調(diào)制解調(diào)器應(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。\n\n MAX3238E和MAX3248E僅輸入邏輯閾值不同。MAX3238E具有標(biāo)準(zhǔn)邏輯閾值，而MAX3248E具有0.6V至1.2V的低電平邏輯閾值，非常適合1.8V系統(tǒng)。\n\n 發(fā)送器輸入FORCEON和低電平有效FORCEOFF具有一個(gè)400 kΩ有源正反饋電阻。這些輸入驅(qū)動(dòng)到有效邏輯電平后，如果驅(qū)動(dòng)信號(hào)被移除或變?yōu)楦咦钁B(tài)，輸入將保持該電平。未使用的發(fā)射器和邏輯輸入可以懸空。MAX3238E/MAX3248E支持+3.0V至+5.5V的電源電壓范圍。\n\n ?\n\n

MAX3238E

具有 +/-15kV IEC-ESD 保護(hù)的 3V 至 5.5V 多通道 400kbps 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 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 ?15-kV ESD (HBM) PROTECTION

MAX3238E

LINE DRIVER/RECEIVER WITH ESD (HBM) PROTECTION

MAX3238EAI

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

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 ?15kV ESD-Protected I/O and Logic Pins

GeneralDescription TheMAX3238E/MAX3248EtransceiversuseMaxim’srevolutionaryAutoShutdownPlus?featuretoachieve10nAsupplycurrent.Thesedevicesshutdowntheonboardpowersupplyanddriverswhentheydonotsenseavalidsignaltransitiononeitherthereceiverortransmitterinputs.

MAX3238ECDBR

絲?。?a target="_blank" title="Marking" href="/max3238ec/marking.html">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