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General Description The MAX2605–MAX2609 are compact high performance intermediate frequency IF voltage controlled oscillators VCOs designed specifically for demanding portable wireless communication systems They combine monolith ic construction with low noise low power operation in a tiny pin SOT23 package These low noise VCOs feature an on chip varactor and feedback capacitors that eliminate the need for external tuning elements making the MAX2605–MAX2609 ideal for portable systems Only an external inductor is required to set the oscillation frequency In addition an integrated differential output buffer is provided for dri ving a mixer or prescaler The buffer output is capable of supplying up to 8dBm differential with a simple power match It also provides isolation from load impedance variations The MAX2605–MAX2609 operate from a single 7V to 5V supply and offer low current consumption These IF oscillators can cover the 45MHz to 650MHz frequency range

General Description The MAX2605–MAX2609 are compact high performance intermediate frequency IF voltage controlled oscillators VCOs designed specifically for demanding portable wireless communication systems They combine monolith ic construction with low noise low power operation in a tiny pin SOT23 package These low noise VCOs feature an on chip varactor and feedback capacitors that eliminate the need for external tuning elements making the MAX2605–MAX2609 ideal for portable systems Only an external inductor is required to set the oscillation frequency In addition an integrated differential output buffer is provided for dri ving a mixer or prescaler The buffer output is capable of supplying up to 8dBm differential with a simple power match It also provides isolation from load impedance variations The MAX2605–MAX2609 operate from a single 7V to 5V supply and offer low current consumption These IF oscillators can cover the 45MHz to 650MHz frequency range

General Description The MAX6668 MAX6670 remote junction thermal switches with an internal power transistor drive a cool ing fan rated for supply voltages up to +12V and 250mA These devices measure the temperature of an external P N junction typically a diode connected tran sistor and turn on the fan power switch when the remote temperature rises above a factory programmed threshold Self contained and requiring no software development the MAX6668 MAX6670 are simple “drop in” fan control solutions for a variety of systems The MAX6670 features an open drain WARN output that goes active when the remote temperature exceeds the factory programmed fan activation threshold by +15°C The MAX6670 features an open drain OT output that goes active when the remote temperature exceeds the factory programmed threshold by +30°C The MAX6668 MAX6670 provide a fan control input FORCEON that allows the fan to be driven externally regardless of temperature Available temperature thresholds range from +40°C to +75°C in 5°C increments Hysteresis is preset to 8°C on the MAX6668 or pin selectable to 4°C 8°C or 12°C using a three level logic input on the MAX6670 Temperature threshold accuracy is ±1°C typ and 2°C max for remote junction temperatures from +40°C to +75°C The MAX6668 MAX6670 operate from a +3V to 6V power supply and are specified over the automotive temperature range 40°C to +125°C The MAX6668 is offered in an pin MAX package and the MAX6670 is available in a space saving pin MAX package

General Description The MAX6668 MAX6670 remote junction thermal switches with an internal power transistor drive a cool ing fan rated for supply voltages up to +12V and 250mA These devices measure the temperature of an external P N junction typically a diode connected tran sistor and turn on the fan power switch when the remote temperature rises above a factory programmed threshold Self contained and requiring no software development the MAX6668 MAX6670 are simple “drop in” fan control solutions for a variety of systems The MAX6670 features an open drain WARN output that goes active when the remote temperature exceeds the factory programmed fan activation threshold by +15°C The MAX6670 features an open drain OT output that goes active when the remote temperature exceeds the factory programmed threshold by +30°C The MAX6668 MAX6670 provide a fan control input FORCEON that allows the fan to be driven externally regardless of temperature Available temperature thresholds range from +40°C to +75°C in 5°C increments Hysteresis is preset to 8°C on the MAX6668 or pin selectable to 4°C 8°C or 12°C using a three level logic input on the MAX6670 Temperature threshold accuracy is ±1°C typ and 2°C max for remote junction temperatures from +40°C to +75°C The MAX6668 MAX6670 operate from a +3V to 6V power supply and are specified over the automotive temperature range 40°C to +125°C The MAX6668 is offered in an pin MAX package and the MAX6670 is available in a space saving pin MAX package

General Description The MAX1684 MAX1685 are high efficiency internal switch pulse width modulation PWM step down switch ing regulators intended to power cellular phones communicating PDAs and handy terminals These devices deliver a guaranteed 1A output current from two lithium ion Li+ batteries Their wide input voltage range of 7V to 14V gives design flexibility and allows batteries to charge from a wall cube since the ICs operate at the higher voltages that occur when the battery is removed The output voltage is preset to 3V or can be externally adjusted from 25V to VIN The low on resistance power switch and built in synchro nous rectifier provide high efficiencies of up to There are four modes of operation: fixed frequency nor mal low power and shutdown The fixed frequency PWM mode of operation offers excellent noise character istics The normal mode maintains high efficiency at all loads The low power mode is used to conserve power in standby or when full load is not required The shutdown mode is used to power down the device for minimal cur rent draw The MAX1684 runs at 300kHz for applications that require highest efficiency The MAX1685 runs at 600kHz to allow the use of smaller external compo nents These devices can also be synchronized to an external clock Other features include a duty cycle for low dropout applications an auxiliary 3V 5mA output and a accurate reference Both devices are available in a space saving QSOP package An evaluation kit is also available to help speed designs For a similar device in a pin MAX package with lower input voltage requirements 5V max refer to the MAX1692 data sheet

General Description The MAX1684 MAX1685 are high efficiency internal switch pulse width modulation PWM step down switch ing regulators intended to power cellular phones communicating PDAs and handy terminals These devices deliver a guaranteed 1A output current from two lithium ion Li+ batteries Their wide input voltage range of 7V to 14V gives design flexibility and allows batteries to charge from a wall cube since the ICs operate at the higher voltages that occur when the battery is removed The output voltage is preset to 3V or can be externally adjusted from 25V to VIN The low on resistance power switch and built in synchro nous rectifier provide high efficiencies of up to There are four modes of operation: fixed frequency nor mal low power and shutdown The fixed frequency PWM mode of operation offers excellent noise character istics The normal mode maintains high efficiency at all loads The low power mode is used to conserve power in standby or when full load is not required The shutdown mode is used to power down the device for minimal cur rent draw The MAX1684 runs at 300kHz for applications that require highest efficiency The MAX1685 runs at 600kHz to allow the use of smaller external compo nents These devices can also be synchronized to an external clock Other features include a duty cycle for low dropout applications an auxiliary 3V 5mA output and a accurate reference Both devices are available in a space saving QSOP package An evaluation kit is also available to help speed designs For a similar device in a pin MAX package with lower input voltage requirements 5V max refer to the MAX1692 data sheet

General Description The MAX3222E MAX3232E MAX3237E MAX3241E are 3V powered EIA TIA and V V communications interfaces with low power requirements high data rate capabilities and enhanced electrostatic discharge ESD protection All transmitter outputs and receiver inputs are protected to ±15kV using IEC Air Gap Discharge ±8kV using IEC Contact Dis charge and ±15kV using the Human Body Model The MAX3237E s logic and receiver I O pins are protected to the above standards while the transmitter output pins are protected to ±15kV using the Human Body Model The transceivers have a proprietary low dropout transmit ter output stage delivering true RS performance from a 0V to 5V supply with a dual charge pump The charge pump requires only four small F capacitors for operation from a 3V supply Each device is guaran teed to run at data rates of 250kbps while maintaining RS output levels The MAX3237E is guaranteed to run at data rates of 250kbps in the normal operating mode and 1Mbps in the MegaBaud™ operating mode while main taining RS compliant output levels The MAX3222E MAX3232E have two receivers and two drivers The MAX3222E features a A shutdown mode that reduces power consumption and extends battery life in portable systems Its receivers can remain active in shutdown mode allowing external devices such as modems to be monitored using only A supply current Both the MAX3222E and MAX3232E are pin package and functionally compatible with the industry standard MAX242 and MAX232 respectively The MAX3241E is a complete serial port three drivers five receivers designed for notebook and subnotebook com puters The MAX3237E five drivers three receivers is ideal for peripheral applications that require fast data transfer Both devices feature a shutdown mode in which all receivers can remain active while using a supply cur rent of only A MAX3241E or 10nA MAX3237E The MAX3237E MAX3241E have additional receiver outputs that always remain active The MAX3222E and MAX3232E are available in space saving SO SSOP and TSSOP packages The ...

General Description The MAX3222E MAX3232E MAX3237E MAX3241E are 3V powered EIA TIA and V V communications interfaces with low power requirements high data rate capabilities and enhanced electrostatic discharge ESD protection All transmitter outputs and receiver inputs are protected to ±15kV using IEC Air Gap Discharge ±8kV using IEC Contact Dis charge and ±15kV using the Human Body Model The MAX3237E's logic and receiver I O pins are protected to the above standards while the transmitter output pins are protected to ±15kV using the Human Body Model The transceivers have a proprietary low dropout transmit ter output stage delivering true RS performance from a 0V to 5V supply with a dual charge pump The charge pump requires only four small F capacitors for operation from a 3V supply Each device is guaran teed to run at data rates of 250kbps while maintaining RS output levels The MAX3237E is guaranteed to run at data rates of 250kbps in the normal operating mode and 1Mbps in the MegaBaud™ operating mode while main taining RS compliant output levels The MAX3222E MAX3232E have two receivers and two drivers The MAX3222E features a A shutdown mode that reduces power consumption and extends battery life in portable systems Its receivers can remain active in shutdown mode allowing external devices such as modems to be monitored using only A supply current Both the MAX3222E and MAX3232E are pin package and functionally compatible with the industry standard MAX242 and MAX232 respectively The MAX3241E is a complete serial port three drivers five receivers designed for notebook and subnotebook com puters The MAX3237E five drivers three receivers is ideal for peripheral applications that require fast data transfer Both devices feature a shutdown mode in which all receivers can remain active while using a supply cur rent of only A MAX3241E or 10nA MAX3237E The MAX3237E MAX3241E have additional receiver outputs that always remain active The MAX3222E and MAX3232E are available in space saving SO SSOP and TSSOP packages The ...

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