Exar
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Exar Corporation powers connectivity with an extensive array of power management, communications, and interface silicon solutions. Exar's power management ICs are used in a variety of applications and include LDOs, DC/DC switching regulators, PWM controllers, charge pumps, and microprocessor supervisors. The products are designed for use together to a create complete power management systems but can also be used as standalone solutions. Exar also offers online design tools to help designers create customized solutions using Exar products.
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Exar SP338E Multiprotocol Serial Transceivers & Eval Board
Exar SP338E Multiprotocol Serial Transceivers are advanced multiprotocol transceivers supporting RS-232, RS-485, and RS-422 serial standards in a 40 pin QFN package. Integrated cable termination and four configuration modes allow all three protocols to be used interchangeably over a single cable or connector with no additional switching components. Full operation of the Exar SP338E Multiprotocol Serial Transceivers requires only four external charge pump capacitors. The RS-485/RS-422 modes feature up to two drivers and four receivers (2TX/4RX) in half, full, and mixed duplex configurations. The RS-232 mode (3TX/5RX) provides full support of all eight signals commonly used with the DB9 RS-232 connector. An Exar SP338E Multiprotocol Serial Transceiver Evaluation Board is also available.
Exar XRP6272 Adjustable Low Dropout Voltage Regulator
Exar's XRP6272 Adjustable Low Dropout Voltage Regulator is capable of a constant output current of up to 2 Amps. The XRP6272 Adjustable Low Dropout Voltage Regulator has a wide 1.8 to 6 volt input voltage that allows for single supply operations from the industry standard 1.8V, 2.8V, 3.3V and 5V power rails as well as the 5.8V rail. With better than ±2% output voltage accuracy, low output noise and high Power Supply Rejection Ratio (PSRR), Exar's XRP6272 Adjustable Low Dropout Voltage Regulator is perfectly suited for powering RF circuitries. Optimized for use with small low cost ESR ceramic capacitors and featuring a low 30µA quiescent current, the XRP6272 Adjustable Low Dropout Voltage Regulator is also adequate for use in battery powered portable equipment.
Exar XR20M1280 Single-Channel UART Evaluation Boards
Exar's XR20M1280 Single-Channel UART Evaluation Boards support the evaluation of the Exar XR20M1280 Series UARTs. The XR20M1280 Series are single-channel I2C/SPI Universal Asynchronous Receiver and Transmitter (UART) with integrated level shifters and 128 bytes of transmit and receive FIFOs. Exar's XR20M1280 Single-Channel UARTs have user selectable default mode configuration (I2C or SPI) and are available in three different packages (QFN-24, QFN-32 and QFN-40). These Exar XR20M1280 Single-Channel UARTs are also available with three different configurations of number of GPIOs (4, 8 or 16).
Exar SP339E Series Multiprotocol Transceivers
Exar's SP339E Series Multiprotocol Transceivers are an advanced multiprotocol transceiver supporting RS-232, RS-485, and RS-422 serial standards. In the RS-485/422 modes these SP339E Series feature one driver and one receiver (1TX/1RX) in both half and full duplex configurations. In the RS-232 mode (3TX/5RX) these SP339E Series Multiprotocol Transceivers provide full support of all eight signals commonly used with the DB9 RS-232 connector. A dedicated diagnostic loopback mode is also provided. These Exar SP339E Series Multiprotocol Transceivers operate up to 20Mbps in RS-485/422 modes, and up to 1Mbps in RS-232 mode. All drivers can be slew limited to 250kbps in any mode to minimize electromagnetic interference (EMI).
Exar XRA12xx 8-Bit I2C/SMBus General Purpose I/O Expanders
These Exar XRA12xx 8-Bit I2C/SMBus General Purpose I/O Expanders features a I2C/SMBus interface. After power-up, the XRA12xx 8-Bit General Purpose I/O Expanders includes an internal 100K ohm pull-up resistors on each I/O pin that can be individually enabled. In addition, the GPIOs on these Exar XRA12xx 8-Bit General Purpose I/O Expanders can individually be controlled and configured. Applications for these devices include PDAs, cell phones, data, battery operated, GPS and bluetooth devices.
Exar XRA14xx 8-Bit SPI General Purpose I/O Expanders
These Exar XRA14xx 8-Bit SPI General Purpose I/O Expanders features a SPI interface. After power-up, the XRA14xx 8-Bit General Purpose I/O Expanders includes an internal 100K ohm pull-up resistor on each I/O pin that can be individually enabled. In addition, the GPIOs on these Exar XRA14xx 8-Bit General Purpose I/O Expanders can individually be controlled and configured. Applications for these devices include PDAs, cell phones, data, battery operated, GPS and bluetooth devices.
Exar XRP7714 Series Quad Channel Digital PWM Step Down Controller
Exar's XRP7714 is a Quad Channel Digital Pulse-Width Modulated (PWM) Step-Down Controller with a built-in LDO for standby power and GPIOs. The XRP7714 provides a complete power management solution in one IC and is fully programmable via an I2C serial interface. Independent Digital Pulse Width Modulator (DPWM) channels of the Exar XRP7714 Quad Channel Digital PWM Step Down Controller regulates output voltages and provides all of the required protection functions such as current limiting and over-voltage protection. This Exar XRP7714 series of Quad Channel Digital PWM Step Down Controller offers a complete solution including independently programmable: soft-start, soft-stop, start-up delay and ramp of each PWM regulator.
Exar XRP2997 2A Bus Termination Regulator
Exar's XRP2997 is a Double Data Rate (DDR)2A Termination Voltage Regulator that supports all power requirements of DDR I, II and III memories and is capable of sinking or sourcing 2A continuously. By tightly regulating its output voltage within ±20mV, the Exar XRP2997 2A Bus Termination Regulator converts input voltages as low as 1.1V while the output voltage is adjustable through an external resistor divider or by forcing the VREF pin voltage. A built-in source/sink overcurrent, over-temperature and under-voltage lockout protections on the XRP2997 insures safe operation under abnormal operating conditions.
Exar XRP7618 8-Channel Constant Current LED Driver
The Exar XRP7618 is an 8-Channel, high voltage, constant-current sink LED driver capable of driving up to 100mA current per channel. With outputs rated at 30V, the XRP7618 can control strings of multiple LEDs with better than ±1.5% channel to channel current matching. LED channel current is programmed via an external resistor on this Exar XRP7618 8-Channel Constant Current LED Driver within a 10mA to 100mA range. Dimming control is supported through a standard PWM scheme of up to 25kHz or through an analog signal. Exar's XRP7618 features Smart Talk™ technology, when combined with a boost converter, it maximizes the overall system efficiency by dynamically reporting the minimum LED voltage necessary to maintain current regulation mode.
Exar XRP7714EVB-DEMO-2P Demo Boards
Exar XRP7714EVB-DEMO-2P Demo Boards are complete, working, four-channel power systems featuring the XRP7714 programmable controller. Exar XRP7714EVB-DEMO-2P 2" x 2.5" Demo Boards are capable of producing over 35W and provide 3.3V, 2.5V, 1.8V, and 1V at a maximum of 4A per channel. The 2.5V, 1.8V, and 1V supplies can be adjusted in 50mV increments, and the 3.3V supply is adjustable in 100mV increments. The order and ramp rates for each supply can be programmed to accommodate any sequencing requirement. All power supply operations can be controlled over an I²C interface. Faults, output voltages, and currents can also be monitored. Four GPIO signals are available and can be programmed to provide status of power good signals enables and faults. Unused GPIO pins can be programmed as I/O expansion for a microcontroller. The board is supported by PowerArchitect™ and plugs directly onto the Exar Communications Module (XRP77xxEVBXCM).
Exar XRP252x Series USB 3.0 Power Distribution Switches
Exar XRP252x single- and dual-channel power distribution switches support USB 3.0 and all earlier USB specifications. The Exar XRP2525 and XRP2526 are optimized for VBUS power distribution applications with a guaranteed continuous 900mA per channel current capability, controlled rise and fall time, and enhanced port protection. The Exar XRP2527 and XRP2528 have continuous current ratings of 1A per channel, accept input voltages as low as 1.8V, and are perfectly suited for generic power distribution applications. XRP2527 and XRP2528 power distribution switches also provide enhanced power port protection by an externally programmable current limit providing better than 8% accuracy at full current range. These USB 3.0 power distribution switches accept a wide input voltage range of 1.75V to 5.5V suitable to operate from industry standard 1.8V, 3.3V, and 5V power rails.
Exar XR20M1280 Single-Channel UARTs with Integrated Level Shifters
The Exar XR20M1280 is the industry's fastest UART with a selectable I²C/SPI interface. Exar XR20M1280 single-channel UARTs with integrated level shifters have a maximum data rate of 24 Mbps and 128 bytes of transmit and receive FIFOs. The maximum clock frequency on the SPI interface is 26 MHz. XRM20M1280 single-channel UARTs can interface with devices operating at different voltage levels, eliminating the need for external voltage-level shifter. The independent TX/RX Baud Rate Generator feature allows the transmitter and receiver to operate at different baud rates. The XR20M1280 has a 16550 compatible register set that provide users with operating status and control, receiver error indications, and modem serial interface controls. An internal loopback capability allows onboard diagnostics. XR16M890 single-channel UARTs can interface with devices operating at different voltage levels, eliminating the need for external voltage-level shifter. These Exar single-channel UARTs target a variety of portable applications, including smart phones, Bluetooth®, personal digital assistants, GPS systems, and other battery operated devices.
Exar XRP7665 Step-Down PowerBlox™ Converters
Exar XRP7665 Step-Down PowerBlox™ Step-Down Converters are optimized for 12V input voltage rail and also capable of operating from a 5V rail, addressing the needs for smaller footprint and substantial savings in cost-sensitive applications. These Exar step-down converters have a maximum load current of 3A and operating input voltage of up to 18V. They operate in at a fixed 340 kHz switching frequency and can reach up to 93% efficiency in a compact "green" SOIC package. Design flexibility of any point-of-load supply with the XRP7665 is further enhanced with the availability of a dedicated enable function and programmable soft start. Built-in current limit, output over voltage and thermal shutdown protection provide the XRP7665 with fail-safe operations. These Exar step-down converters are ideal for use in audio-video equipment such as set-top boxes, telecom, computing peripherals and more generally distributed point-of-load conversions.
Exar XRP7664 2A , 18V Synchronous Step-Down Converters
Exar XRP7664 synchronous step-down converters are capable of a constant output current up to 2A. The XRP7664 features a wide 4.75V to 18V input voltage range that allows for single supply operations from industry standard 5V and 12V power rails. XRP7664 synchronous step-down converters have a 340kHz constant operating frequency and integrated high and low side 120mΩ/110mΩ MOSFETs that reduce the overall component count and solution footprint. Current-mode control provides fast transient response and cycle-by-cle current limit. Current-mode control provides fast transient response and cycle-by-cycle current limit. An adjustable soft-start prevents inrush current at turn-on, and in shutdown mode the supply current drops to 0.1uA. These Exar devices also offer built-in output over voltage (open load), over temperature, cycle-by-cycle over current and under voltage lockout (UVLO) protections, ensuring safe operations under abnormal operating conditions.
Exar XR16M890 Single-Channel UARTs
Exar XR16M890 single-channel UARTs with selectable 8-bit Intel/Motorola/VLIO bus interface are the industry's fastest UARTs with integrated level shifters. XR16M890 single-channel UARTs feature a maximum data rate of 24 Mbps and offer 128 bytes of transmit and receive FIFOs. These Exar devices also have up to 16 GPIO pins, Auto RTS/CTS Hardware Flow Control, Auto XON/XOFF Software Flow Control, TX/RX FIFO Counters, selectable or programmable transmit and receive FIFO trigger levels, and Fractional and Independent TX/RX Baud Rate Generators. Additionally, these devices offer Sleep and PowerSave modes to minimize power consumption. XR16M890 UARTs are ideal for a variety of portable applications, including smart phones, Bluetooth®, PDAs, GPS systems, and other battery-operated devices.