General Description

The DS1089L is a clock generator that produces a spread-spectrum (dithered) square-wave output of frequencies from 130kHz to 66.6MHz. The DS1089L is shipped from the factory programmed at a specific frequency. The DS1089L is pin-for-pin compatible with the DS1087L, however, the DS1089L dithers at equal percentages above and below the center frequency. The user still has access to the internal frequency divider, selectable ±1, ±2, ±4, or ±8 dithered output, dithering rate, and programmable output power-down/disable mode through an I2C-compatible programming interface. All the device settings are stored in nonvolatile (NV) EEPROM allowing it to operate in stand-alone applications. The DS1089L also has power-down and output-enable control pins for power-sensitive applications.

Features

● Factory-Programmed Square-Wave Generator from 33.3MHz to 66.6MHz

● Center Frequency Remains Constant Independent of Dither Percentage

● No External Timing Components Required

● EMI Reduction

● Variable Dither Frequency

● User Programmable Down to 130kHz with Divider (Dependent on Master Oscillator Frequency)

● ±1, ±2, ±4, or ±8 Selectable Dithered Output

● Glitchless Output-Enable Control

● I2C-Compatible Serial Interface

● Nonvolatile Settings

● Power-Down Mode

● Programmable Output Power-Down/Disable Mode

Applications

● Printers

● Copiers

● Computer Peripherals

● POS Terminals

● Cable Modems