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.
Exar SP3221E Intelligent RS-232 Transceiver is intended for portable or battery-powered applications such as embedded computers, data logging devices, medical diagnostics, and remote sensors. This Exar device uses an internal high-efficiency, charge-pump power supply that requires only four 0.1µA capacitors. This charge pump and Exar's driver architecture allow the SP3221E to deliver compliant RS-232 performance from a single power supply ranging from +3.0V to +5.5V. The AUTO ON-LINE® feature allows the device to automatically "wake-up" during a shutdown state when an RS-232 cable is connected and a connected peripheral is turned on. Otherwise, the device automatically shuts itself down, drawing less than 1µA.
Exar XRP7724 Quad Channel Digital PWM (Pulse Width Modulator / PFM (Pulse Frequency Modulator) Step Down Controller is the world's lowest power consumption digital PWM / PFM device. XRP7724 is the first digital controller that can be considered for portable or other power-sensitive applications due to the significant reduction in operating current. Patented technology allows transient performance equivalent to the fastest comparator-based analog technologies, ensuring output capacitor size is kept to a minimum. This Exar step down controller includes three power switch IOs for driving load disconnect MOSFETs. XRP7724 is ready for the next generation of FPGAs and Processors using advanced energy management voltage control by providing output voltage resolution programming as fine as 2.5mV. Each output voltage can be programmed from 0.6V to 5.5V without the need for any external components.
Exar's XRP7613 Step-Down High Brightness LED Driver is a non-synchronous step-down converter with an integrated FET optimized to drive high power LEDs at up to 1.2A of continuous current. A wide 7.0V to 36V input voltage range allows for single supply operations from industry standard 12V, 18V or 24V power rails. Based on a hysteretic PFM control scheme, the XRP7613 can operate at switching frequency up to 1MHz and allows for small external components selection while providing very fast transient response and achieving excellent efficiency. Typical applications include general lighting and displays, architectural and accent lighting, medical and industrial instrumentation, and video projectors.
Exar XRPWRKIT Design Kit includes SP6669, XRP6658, XRP6668 and XRP6657 evaluation boards capable of delivering from 600mA to 1.5A per channel for point of load (POL) solutions. Supporting a 2.5V to 5.5V input voltage range traditional of Lithium-Ion battery operated portable applications, these PWM converters are capable of achieving conversion efficiencies as high as 97% with an adjustable output voltage as low as 0.6V. System architects can further optimize their design with a variety of inductors from Würth included in the design kit to precisely tailor the power conversion stage for performance and ultra-compact designs.
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'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.
The Exar XRD64L43 is a Dual 10-Bit 40 MSPS CMOS Analog-to-Digital Converter (ADC). Manufactured using a standard CMOS process, the XRD64L43 offers low power, low cost and excellent performance. The design architecture of the Exar XRD64L43 Dual 10-Bit 40 MSPS CMOS ADC uses 17 time-interleaved 10-bit SAR ADCs in each converter to achieve high conversion rate of 40 MSPS minimum. Applications for the XRD64L43 include medical imaging, instrumentation, data acquisition systems and digital communications.
Exar's XR16C850 is a Universal Asynchronous Receiver and Transmitter (UART) with 128-byte FIFO. The XR16C850 supports Intel and PC mode data bus interface and is software compatible to industry standard 16C450, 16C550, ST16C580 and ST16C650A UARTs. Exar's XR16C850 UART has 128 bytes of TX and RX FIFOs and is capable of operating up to a serial data rate of 2Mbps. Features for the XR16C850 include programmable TX/RX FIFO trigger levels, automatic hardware/software flow control, auto RS-485 half duplex direction support, programmable Xon/Xoff characters, infrared (IrDA) TX and RX encoder/decoder and sleep mode (100µA stand-by).
Exar's XRT83L30 Single-Channel Transceiver is a long-haul and short-haul line interface unit for T1 (1.544Mbps) 100Ω , E1 (2.048Mbps) 75Ω or 120Ω and J1 110Ω applications. In long-haul applications the XRT83L30 Single-Channel Transceiver accepts signals that have passed through cables from 0 feet to over 6000 feet in length and have been attenuated by 0 to 45dB at 772kHz in T1 mode or 0 to 43dB at 1043kHz in E1 mode. In T1 applications, the Exar XRT83L30 can generate five transmit pulse shapes to meet the short-haul Digital Cross-Connect (DSX-1) template requirements as well as for Channel Service Units (CSU) Line Build Out (LBO) filters of 0dB, -7.5dB, -15dB and -22.5dB as required by FCC rules.
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'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).
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.
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'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'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.
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 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).