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 XRP7657 Non-Synchronous Step Down Converter
The Exar XRP7657 non-synchronous voltage mode PWM step down (buck) converter can provide a constant output current up to 2A and offers a wide 4.75V to 25V input voltage range that allows for single supply operations from industry standard 5V, 12V, and 24V power rails. The XRP7657 step down converter reduces overall component count and solution footprint with a 420 kHz constant operating frequency and integrated high side switch. This Exar device features 2% output setpoint accuracy, high efficiency, low ripple, and excellent line and load regulation. The enable function and soft start feature of the XRP7657 allow for controlled power up sequencing implementation. This Exar step down converter is ideal for use in distributed power architectures, point of load converters, and audio-video and medical equipment.
Exar XRP6657 PWM Synchronous Step Down Converter
The Exar XRP6657 high efficiency PWM synchronous step down DC to DC converter delivers a guaranteed 1.5A output current and is optimized for portable battery-powered applications. The Exar XRP6657 uses a constant 1.3 MHz frequency PWM scheme that allows for compact external components, low output voltage ripple, and fixed frequency noise. This Exar step down converter provides up to 95% efficiency, and an input voltage range of 2.5V to 5.5V. The XRP6657 also has a Pulse Skip Mode (PSM) that is used to improve light load efficiency and a low dropout mode that provides 100% duty cycle operation.
Exar XRT83VL38 / XRT86VX38 8-Channel LIUs
The Exar XRT83VL38 is a fully integrated 8-channel long-haul and short-haul line interface unit (LIU) for T1 (1.544 Mbps) 100Ω, E1 (2.048 Mbps) 75Ω or 120Ω, J1 110Ω, or BITS Timing applications. The Exar XRT86VX38 is an 8-channel 1.55 Mbps or 2.048 Mbps DS1 / E1 / J1 framer and long-haul and short-haul LIU featuring R³ technology and BITS Timing element. The Exar XRT83VL38 LIU
features an Adaptive Receive Equalizer for up to 36dB cable
attenuation, Programable Transmit Pulse Shaper for E1,T1, or J1
short-haul interfaces, five fixed transmit pulse settings for T1
short-haul applications, plus a fully programmable waveform generator
for transmit output pulse shaping available for both T1 and E1 modes.
The XRT86VX38 framer and LIU supports Section 13 -
Synchronization Interface in ITU G.703 for both Transmit and Receive
Paths, SSM Synchronous Messaging Generation (BOC for T1, National Bits
for E1) on the Transmit Path, SSM Synchronous Messaging Extraction (BOC
for T1, National Bits for E1) on the Receive Path, BITS timing
generation on the Transmit Outputs, and BITS timing extraction from NRZ
data on the Analog Receive Path.
Exar XR21V14x UART
The Exar XR21V14x Universal Asynchronous Receiver Transmitter with USB 2.0 compliant bus interface is the industry's fastest UART series. The USB interface on the Exar XR21V14x supports 12 Mbps USB data transfer rate, USB suspend, resume, and remote wakeup operations. This EXAR UART operates from an internal 48 MHz clock, requires no external
crystal/oscillator, and can accurately generate any baud rate using the
internal clock. The UART series includes an automatic transceiver direction control feature that simplifies the hardware for RS-485 applications. The XR21V14x UART is ideal for portable appliances, external converters (dongles), battery-operated devices, and more.
