Part Number: XRT79L71

Function: 1-CHANNEL DS3/E3 CLEAR-CHANNEL FRAMER / LIU COMBO

Package: 17X17 mm 208 Ball Shrink Thin Ball Grid Array

Manufacturer: Exar Corporation

Pinouts:

 

Description

The XRT79L71 is a single channel, integrated DS3/E3 framing controller and Line Interface Unit with Jitter Attenuator that is designed to support Frame processing. For Clear-Channel Framer applications, this device supports the transmission and reception of “user data” via the DS3/E3 payload.

The device includes DS3/E3 Framing, Line Interface Unit with Jitter Attenuator that supports mapping of HDLC framed data. A flexible parallel microprocessor interface is provided for configuration and control.

Features

1. Integrated Jitter Attenuator that can be selected either in Receive or Transmit path

2. Flexible integrated Clock Multiplier that takes single frequency clock and generates either DS3 or E3 frequency.

3. HDLC Controller that provides the mapping/extraction of either bit or byte mapped encapsulated packet from DS3/E3 Frame.

 

XRT79L71 Datasheet PDF Download

Other data sheets are available within the file: XRT-79L71, XRT79L71IB

Part Number: ML4812

Function: Power factor controller

Package: DIP 16, PLCC 20 Pin Type

Manufacturer: Fairchild Semiconductor

Pinouts:

 

Description

The ML4812 is designed to optimally facilitate a peak current control boost type power factor correction system. Special care has been taken in the design of the ML4812 to increase system noise immunity. The circuit includes a precision reference, gain modulator, error amplifier, over voltage protection, ramp compensation, as well as a high current output. In addition, start-up is simplified by an under voltage lockout circuit with 6V hysteresis. In a typical application, the IC functions as a current mode regulator. The current which is necessary to terminate the cycle is a product of the sinusoidal line voltage times the output of the error amplifier which is regulating the output DC voltage. Ramp compensation is programmable with an external resistor, to provide stable operation when the duty cycle exceeds 50%.

Features

• Precision buffered 5V reference (±0.5%)
• Current-input gain modulator reduces external components and improves noise immunity
• Programmable ramp compensation circuit
• 1A peak current totem-pole output drive
• Overvoltage comparator helps prevent output voltage “runaway”
• Wide common mode range in current sense comparators for better noise immunity
• Large oscillator amplitude for better noise immunity

Other data sheets are available within the file: ML4812CP, ML4812CQ

ML4812 Datasheet PDF Download