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's XRP9710/11 Dual 6A Programmable Power Modules are programmable step down power modules providing two 6A outputs. The module package contains the switching controller, power MOSFETs, inductors and support components. As a result, external components are minimal. A wide input voltage range (4.75V to 5.5V or 5.5V to 22V) allows for single supply operation from standard power rails. The modules measure only 12x12x2.75mm making it half the size of competing 12V capable 6Amp modules. The 2.75mm height allows them to be placed on the back of boards or under heat sinks where other solutions cannot, yet they contain two full 6A buck power stages and two Digital Pulse Width Modulator (DPWM) controllers with gate drivers. Designed to operate at a constant PWM switching frequency between 500kHz and 750kHz, the Digital Pulse Frequency Mode (DPFM) results in better than 80% efficiency at light load currents and low operating current allow for portable and Energy Star compliant applications.
Exar XR28V382 Dual and XR28V384 Quad 3.3V LPC UARTs
with 128-byte FIFO are Universal Asynchronous Receivers and Transmitters
(UART) for the Intel Low Pin Count (LPC) bus interface. These devices
can replace or supplement a Super I/O device to add additional serial
ports to the system. The V382 and V384 UARTs support any 16-bit I/O
address supported by the system. The register sets are based on the
industry standard 16550 UART, so they operate with the standard serial
port drivers without requiring a custom driver to be installed. The 128
byte Transmit and Receive FIFOs reduce CPU overhead and minimize the
chance of buffer overflow and data loss. In addition to the 16550 UART
registers, there are also Configuration register set where enhanced
features such as the 9-bit (multidrop) mode, IrDA mode and the Watchdog
Timer can be enabled. The V382 and V384 are available in a 32-pin and a
48-pin TQFP package respectively.
Exar's XRP6141 35A Synchronous Step-Down Controller is designed for point-of-load (POL) supplies up to 35A. A wide 4.5V to 22V input voltage range allows for single supply operation from industry standard 5V, 12V and 19.6V rails. With a proprietary emulated current mode Constant On-Time (COT) control scheme, the XRP6141 provides extremely fast line and load transient response using ceramic output capacitors. It requires no loop compensation hence simplifying circuit implementation and reducing overall component count. The control loop also provides exceptional line regulation and maintains constant operating frequency. A selectable power saving mode allows the user to operate in discontinuous mode (DCM) at light current loads thereby significantly increasing the converter efficiency.
Exar XR3070-78X Low Power 18V Tolerant RS-485/RS-422 Transceivers are a family of high performance RS-485/422 devices that improve performance in noisy industrial environments and increase tolerance to system faults. The analog bus pins withstand direct shorts up to ±18V, and are protected against ESD events up to ±15kV. The differential high output driver delivers 10% higher SNR than standard RS-485/422 devices, allowing additional noise margin or extended cable lengths. Full fail-safe circuitry on the receivers guarantee logic-high receiver output when the receiver inputs are open, shorted, or undriven. With a minimum 96kΩ (1/8 unit load) receiver input impedance, XR3070-78X allows up to 256 devices on the bus while preserving the full signal margin. Short circuit detection as well as thermal shutdown protect the drivers and maintain high impedance in shutdown or when powered off. The XR3070-75X drivers are slew limited for reduced EMI and error-free communication over long or unterminated data cables. The transceivers draw less than 600μA from a +3.3V supply, and typically only 300μA when idling with the receivers active.
Exar XR3160E RS-232/RS-485/RS-422 Transceivers are advanced multiprotocol transceivers with 15KV ESD protection. All transmitter outputs and receiver inputs provide robust electrostatic discharge (ESD) protection to ±15kV IEC 61000-4-2 Airgap, ±15kV Human Body Model (HBM) and ±8kV IEC 61000-4-2 Contact. Full fail-safe protection is included on each receiver output to avoid system lockup, oscillation, or indeterminate states by defaulting to logic-high output level when the inputs are open, shorted, or terminated but undriven. XR3160E's high speed drivers operate up to 20Mbps in RS-485/422 modes, and up to 1Mbps in RS-232 mode. The RS-232 receiver inputs include a 5kΩ pull-down to ground when in RS-232 mode. The RS-485/422 receiver inputs are high impedance (>96kΩ), allowing up to 256 devices on a single communication bus (1/8th unit load). Operating from a single power supply from 3V to 5.5V, the shutdown mode consumes less than 1μA in low power standby operation with RS-232 receivers enabled. All drivers can be slew limited to 250kbps in any mode to minimize electromagnetic interference (EMI) by setting the dedicated SLEW pin low.
Exar's XR308x RS-485/RS-422 +5V Transceivers are a family of high reliability RS-485/422 transceivers designed for harsh industrial environments with enhanced fault and voltage protection. Consisting of nine devices, the family supports data rates up to 20Mbps in either full or half duplex configurations, and is intended for use in remote utility metering, AC and DC motor drives, building automation, security systems, process control, and other industrial automation applications. The XR308x family also offers extremely low power consumption which makes them ideal for high voltage isolated RS-485 applications by facilitating a smaller and lower cost transformer in the isolation power supply.
Exar PFM / PWM Step Down Regulators are 2A capable synchronous current-mode PWM step down (buck) voltage regulators with improved light current load efficiency. A wide 4.5V to 18V input voltage range allows for single supply operations from industry standard 5V and 12V power rails. With a 340kHz constant operating frequency and integrated high and low - side 100mΩ / 100mΩ MOSFETs , the X RP7674 reduces the overall component count and solution footprint. Current - mode control provides fast transient response and cycle- by - cycle OCP. Ideal applications for Exar PFM / PWM Step Down Regulators include Distributed Power Architecture, Portable Equipment, Point of Load Converter, and Audio-Video Equipment.
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.
Exar Dual Ultrafast Voltage Comparators are very high-speed comparators that are pin compatible with, and have improved performance over, Analog Device's AD9687 and Signal Processing Technologies SPT9689, respectively. These Dual Ultrafast Voltage Comparators are designed for use in Automatic Test Equipment (ATE), high speed instrumentation, window comparators, high-speed timing, line receivers and threshold detection applications. Exar Dual Ultrafast Voltage Comparators improvements over other sources include reduced power consumption, reduced propagation delays, and higher input impedance.
Exar COMLINEAR® Standard Definition Video Amplifier is a triple low cost video amplifier capable of driving 2Vpp into 1 (150Ω) or 2 (75Ω) video loads. The COMLINEAR® Standard Definition Video Amplifier features integrated 8MHz, 4th-order low pass filters designed to cleanly pass standard definition video signals while filtering out noise and other unwanted signals, resulting in a crisper, cleaner video signal. Cadeka's COMLINEAR® Standard Definition Video Amplifier offers a fixed gain of 6dB. The COMLINEAR® CLC3800 can be driven by DC-coupled signals and its outputs can drive either AC- or DC-coupled loads.
Exar Hybrid Amplifiers are high-speed hybrid amplifiers that are manufactured using Exar's internal thin film deposition process. These high performance Hybrid Amplifiers are direct replacements for National/Comlinear hybrid products. Exar Hybrid Amplifiers offer a unique combination of speed, dynamic range, low distortion, and drive capability making them ideally suited for many high-end instrumentation, industrial, and military applications. These Hybrid Amplifiers include fast settling, overdrive-protection, low distortion, high speed, high current wideband, linear and differential input/output amplifiers.
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 CDK8307B high-performance, utra-low power octal analog-to-digital converters (ADCs) employ internal reference circuitry, a serial control interface, and serial LVDS output data. Exar CDK8307B ultra-low power 12 / 13-bit ADCs feature an integrated PLL that multiplies the input sampling clock by a factor of 12 or 14, according to the LVDS output setting. The multiplied clock is used for data serialization and data output. Data and frame synchronization output clocks are supplied for data capture at the receiver. These Exar devices provide 35mW/channel low power dissipation at 40MSPS. CDK8307B ADCs are ideal for use in medical imaging, wireless infrastructure, test and measurement, and instrumentation applications.
Exar CDK3404 8-bit triple digital-to-analog converters (DACs) are tailored to fit graphics and video applications where speed is critical. These 8-bit, 180MSPS triple DACs feature CMOS-level inputs that are converted to analog current outputs that can drive 25-37.5Ω loads corresponding to doubly-terminated 50-75Ω loads. The Exar CDK3404 provides ±2.5% gain matching and ±0.5% linearity error and offer sync and blank controls. Exar CDK3404 DACs are designed for use in a variety of applications, including video signal conversion, multimedia systems, image processing, and PC graphics.
Exar COMLINEAR® High Performance Amplifiers focus on leading edge analog solutions. COMLINEAR® High Performance Amplifiers enhance audio, video, and environmental sensing applications. Exar's COMLINEAR® High Performance Amplifiers, are at the core of analog: sensing, amplifying, and conditioning the analog signals present in the systems that engineers design to interface electronics to the analog world. These COMLINEAR® High Performance Amplifiers are available in a variety of types, including low cost, low-noise, ultra-low noise, low-offset, rail-to-rail, current feedback, voltage feedback and low power.