DS1086LU+C66

Overview

The DS1086LU+C66 is a 3.3V programmable clock generator from the EconOscillator family, manufactured by Analog Devices/Maxim Integrated. It produces spread-spectrum square-wave outputs ranging from 130kHz to 66.6MHz. The device features selectable dither magnitudes of 0.5%, 1%, 2%, 4%, or 8% to reduce radiated emissions. It operates on a 2.7V to 3.6V supply and includes nonvolatile EEPROM memory for standalone configuration. Key controls include power-down mode and glitchless output enable.

Feature Summary

• Programmable frequency range from 130kHz to 66.6MHz with 5kHz master frequency step size
• Selectable spread-spectrum dithering (0.5%, 1%, 2%, 4%, 8%) via pin SPRD and register settings
• Nonvolatile EEPROM storage for factory-programmed default settings
• Industrial temperature range operation (-40°C to +85°C) in an 8-pin µSOP package

Applications

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

Procurement Notes

Verify the specific C66 suffix against official documentation to confirm custom factory programming requirements. Standard DS1086LU+ devices are available; custom variants may require direct contact with the manufacturer for ordering and lead time information.

Selection Notes

Select this component when EMI reduction via spread-spectrum clocking is required without external timing components. Ensure the application supports the 2-wire serial interface for frequency configuration if dynamic changes are needed. Verify that the 3.3V supply voltage aligns with system requirements.

Part Context

The DS1086L series belongs to Maxim Integrated's EconOscillator line, designed as low-cost, single-chip solutions for clock generation. The 'LU' designation indicates the industrial temperature grade and µSOP package. The '+' suffix denotes lead-free/RoHS compliance. This part replaces older crystal-based oscillator designs in compact digital systems.

Replacement Considerations

Direct pin-compatible replacements within the same family include the DS1086LU+ for standard configurations. For applications requiring different voltage levels, consider the DS1086U series (5V). Verify that any substitute maintains the required spread-spectrum capabilities and EEPROM functionality.

FAQ

How is the dither magnitude selected?

The dither magnitude (0.5%, 1%, 2%, 4%, or 8%) is selected using the JS2, JS1, and JS0 bits in the PRESCALER register. Additionally, the SPRD pin must be held high to enable the dither function.

What is the purpose of the OE and PDN pins?

The OE (Output Enable) pin gates the clock output buffer, allowing glitchless enabling/disabling of the output. The PDN (Power-Down) pin disables the master oscillator entirely to save power in sensitive applications.

Can the device operate without a microcontroller?

Yes, the DS1086L can operate in stand-alone mode. Settings stored in the nonvolatile EEPROM allow the device to generate the programmed frequency immediately upon power-up without external programming.