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MAX3237

3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232 Transceivers Using Four 0.1uF External Capacitors

GeneralDescription TheMAX3222/MAX3232/MAX3237/MAX3241transceivershaveaproprietarylow-dropouttransmitteroutputstageenablingtrueRS-232performancefroma3.0Vto5.5Vsupplywithadualchargepump.Thedevicesrequireonlyfoursmall0.1μFexternalchargepumpcapacitors.TheMAX3222,

MAX3237

3.0V至5.5V、低功耗、1Mbps、真RS-232收發(fā)器; ? 集成特性節(jié)省電路板空間、簡化設計\n? 電荷泵電路省去±12V雙極性電源 \n? +3V至+5.5V單電源工作范圍 \n? 隨時就緒附加輸出支持監(jiān)測外部設備\n\n\n? 節(jié)能特性延長電池壽命\n? 關斷模式下，接收器保持有效時1μA關斷電流(MAX3222、MAX3237、MAX3241);

MAX3222/MAX3232/MAX3237/MAX3241收發(fā)器具有專有的低壓差發(fā)送器輸出級，利用雙電荷泵在3.0V至5.5V電源電壓下可實現真正的RS-232性能。器件僅需四個0.1μF外部電荷泵小電容。MAX3222、MAX3232和MAX3241確保在120kbps數據率下維持RS-232輸出電平。MAX3237在常規(guī)工作模式下可確保250kbps數據率，在MegaBaud?工作模式下保證1Mbps數據率。\n\n MAX3222/MAX3232有2路接收器和2路驅動器。MAX3222和MAX3232的引腳、封裝及功能分別與MAX242和MAX232兼容。\n\n MAX3241有5路接收器和3路驅動器，MAX3237有3路接收器和5路驅動器。接收器R1 (MAX3237/MAX3241)和R2 (MAX3241)除標準輸出外還提供附加輸出。這些附加輸出始終保持有效，可以對外部設備進行監(jiān)測，電路中無需正向偏置保護二極管(可以完全取消VCC)。\n\n MAX3222、MAX3232和MAX3241采用節(jié)省空間的TSSOP和SSOP封裝，工作在-40°C至+85°C或0°C至70°C溫度范圍。\n\n \n\n

MAX3237

Transceivers Transmitter

MAX3237CAI

3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232 Transceivers Using Four 0.1uF External Capacitors

GeneralDescription TheMAX3222/MAX3232/MAX3237/MAX3241transceivershaveaproprietarylow-dropouttransmitteroutputstageenablingtrueRS-232performancefroma3.0Vto5.5Vsupplywithadualchargepump.Thedevicesrequireonlyfoursmall0.1μFexternalchargepumpcapacitors.TheMAX3222,

MAX3237E

?15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers

GeneralDescription TheMAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E+3.0V-poweredEIA/TIA-232andV.28/V.24communicationsinterfacedevicesfeaturelowpowerconsumption,highdata-ratecapabilities,andenhancedelectrostatic-discharge(ESD)protection. Next-GenerationDeviceFeatures ?Fo

MAX3237E

±15kV ESD保護、電流低至10nA、3.0V至5.5V供電、速率高達1Mbps的真RS-232收發(fā)器; ? 對于空間受限的應用\n? MAX3228E/MAX3229E：±15kV ESD保護，+2.5V至+5.5V、RS-232收發(fā)器，UCSP封裝\n\n\n? 對于低電壓或數據電纜應用\n? MAX3380E/MAX3381E：+2.35V至+5.5V、1μA，2Tx/2Rx、RS-232收發(fā)器，帶有±15kV ESD保護的I/O和邏輯引腳;

MAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E為+3.0V供電的EIA/TIA-232和V.28/V.24通信接口芯片，具有低功耗、高數據速率、增強型ESD保護等特性。增強型ESD結構為所有發(fā)送器輸出和接收器輸入提供保護，可承受±15kV IEC 1000-4-2氣隙放電、±8kV IEC 1000-4-2接觸放電(MAX3246E為±9kV)和±15kV人體放電模式。MAX3237E的邏輯引腳及接收器I/O引腳均提供上述保護，而它的發(fā)送器輸出引腳提供±15kV人體放電模式的保護。\n\n 采用專有的低壓差發(fā)送輸出級，+3.0V至+5.5V供電時利用內部雙電荷泵提供真正的RS-232性能。工作于+3.3V電源時，電荷泵僅需要四個0.1μF的小電容。每款器件保證在250kbps數據速率下維持RS-232輸出電平。MAX3237E確保標準工作模式下提供250kbps的數據速率、在MegaBaud?工作模式下速率高達1Mbps。\n\n MAX3222E/MAX3232E包括兩個發(fā)送器和兩個接收器；MAX3222E具有1μA關斷模式，可降低電池供電便攜式系統的功耗。關斷模式下，MAX3222E接收器仍保持有效狀態(tài)，允許監(jiān)視外設，而且僅消耗1μA的電源電流。MAX3222E和MAX3232E的引腳、封裝和功能分別兼容于工業(yè)標準的MAX242和MAX232。\n\n MAX3241E/MAX3246E提供完備的串口(3個驅動器/5個接收器)，專為筆記本電腦和亞筆記本電腦設計。MAX3237E (5個驅動器/3個接收器)非常適合要求高速數據傳輸的外圍設備。這些器件都具有關斷模式，此模式下所有接收器仍保持有效狀態(tài)，而且僅消耗1μA (MAX3241E/MAX3246E)或10nA (MAX3237E)的電流。\n\n MAX3222E、MAX3232E和MAX3241E都具有節(jié)省空間的SO、SSOP、TQFN及TSSOP封裝，MAX3237E提供SSOP封裝，MAX3246E提供超小型6 x 6 UCSP?封裝。\n\n \n\n

MAX3237E

具有 +/-15kV IEC-ESD 保護的 3V 至 5.5V 多通道 1Mbps RS-232 線路驅動器/接收器; ? 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 From 250 kbits/s to 1 Mbit/s\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? Designed to Be Interchangeable With Maxim MAX3237E\n? Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II\n? ESD Protection for RS-232 I/O 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, Hand-Held, and Portable Equipment\n? PDAs and Palmtop PCs\n? Notebooks, Sub-Notebooks, and Laptops\n? Digital Cameras\n? Mobile Phones and Wireless Devices;

The MAX3237E consists of five line drivers, three line receivers, and a dual charge-pump circuit with ±15-kV ESD 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 an asynchronous communication controller and the serial-port connector. The charge pump and four small external capacitors allow operation from a single 3-V to 5.5-V supply. This device operates at data signaling rates of 250 kbit/s in normal operating mode (MBAUD?=?GND) and 1Mbit/s when MBAUD = VCC. The driver output slew rate is a maximum of 30 V/μs. The MAX3237E transmitters are disabled and the outputs are forced into high-impedance state when the device is in shutdown mode (SHDN = GND) and the supply current falls to less than 1 μA. Also, during shutdown, the onboard charge pump is disabled; V+ is lowered to VCC, and V– is raised toward GND. Receiver outputs also can be placed in the high-impedance state by setting enable (EN) high. ROUT1B remains active all the time, regardless of the EN and SHDN condition. The MAX3237EC is characterized for operation from 0°C to 70°C. The MAX3237EI is characterized for operation from –40°C to 85°C.

MAX3237EAI

3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232 Transceivers Using Four 0.1uF External Capacitors

GeneralDescription TheMAX3222/MAX3232/MAX3237/MAX3241transceivershaveaproprietarylow-dropouttransmitteroutputstageenablingtrueRS-232performancefroma3.0Vto5.5Vsupplywithadualchargepump.Thedevicesrequireonlyfoursmall0.1μFexternalchargepumpcapacitors.TheMAX3222,

MAX3237ECAI+

±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 Transceivers

GeneralDescription TheMAX3222E/MAX3232E/MAX3237E/MAX3241E/MAX3246E+3.0V-poweredEIA/TIA-232andV.28/V.24communicationsinterfacedevicesfeaturelowpowerconsumption,highdata-ratecapabilities,andenhancedelectrostatic-discharge(ESD)protection.TheenhancedESDstructureprotectsall

MAX3237ECDB

絲印：MAX3237EC；Package：SSOP；3-V TO 5.5-V MULTICHANNEL RS-232 1-MBit/s LINE DRIVER/RECEIVER

FEATURES ?MeetsorExceedstheRequirementsof TIA/EIA-232-FandITUv.28Standards ?OperatesWith3-Vto5.5-VVCCSupply ?OperatesFrom250kbits/sto1Mbit/s ?LowStandbyCurrent...1mATypical ?ExternalCapacitors...4×0.1mF ?Accepts5-VLogicInputWith3.3-VSupply ?