DS1086LU-527+T

Overview

The DS1086LU-527+T is a 3.3V programmable clock generator featuring spread-spectrum capabilities. It generates square-wave outputs from 130kHz to 66.6MHz with selectable dithering of 0.5%, 1%, 2%, 4%, or 8% below the programmed frequency to reduce radiated emissions. The device operates on a 2.7V to 3.6V supply and includes a power-down mode and glitchless output-enable control. All settings are stored in nonvolatile EEPROM, allowing standalone operation without external timing components.

Feature Summary

• Programmable frequencies from 130kHz to 66.6MHz with 5kHz master frequency step size
• Selectable dithered output (0.5%, 1%, 2%, 4%, or 8%) for EMI reduction
• Nonvolatile EEPROM memory for standalone configuration storage
• 2-Wire serial interface for register programming and address setting

Applications

• Printers
• Copiers
• PCs
• Computer Peripherals
• Cell Phones

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and lead-free status. The datasheet indicates that the '+' suffix denotes a lead-free/RoHS-compliant package in an 8-pin μSOP. Confirm availability through authorized distributors as supply may be restricted.

Selection Notes

Select this component when a low-component-count, programmable clock source with spread-spectrum features is required. Ensure the application voltage falls within the 2.7V to 3.6V range. Verify that the required output frequency can be achieved using the internal master oscillator and prescaler settings defined in the datasheet tables.

Part Context

The DS1086L series belongs to Maxim Integrated's EconOscillator family, designed to replace traditional crystal oscillators and multipliers. The 'LU' designation specifies the industrial temperature range (-40°C to +85°C) and the 8-pin μSOP package. This part integrates the oscillator, divider, and EEPROM into a single compact solution.

Replacement Considerations

Direct replacements must match the 3.3V supply, 8-pin μSOP package, and 2-wire interface. Check if alternative models in the DS1086L family offer different default frequencies or dither ranges suitable for the specific design requirements.

FAQ

How is the output frequency determined?

The output frequency is calculated based on the OFFSET, DAC, and prescaler registers. The formula is: f_OUTPUT = (MIN FREQUENCY OF SELECTED OFFSET RANGE + (DAC VALUE x 5kHz)) / Prescaler.

What is the function of the SPRD pin?

The SPRD pin enables or disables the spread-spectrum dithering. When high, dither is enabled; when low, it is disabled.

Can the device operate without being programmed by a microcontroller?

Yes, because all settings are stored in nonvolatile EEPROM, the device can operate in a standalone mode after initial programming.