DS1086U-266+

Overview

The DS1086U-266+ is a programmable spread-spectrum clock generator in an 8-pin µSOP package. It generates square-wave outputs from 260kHz to 133MHz with selectable 2% or 4% dithering for EMI reduction. The device operates on a 5V supply and includes power-down and glitchless output-enable controls. All settings are stored in nonvolatile EEPROM, enabling standalone operation without external timing components.

Feature Summary

• Programmable frequency range of 260kHz to 133MHz with 10kHz master step size
• Selectable 2% or 4% peak dithering via SPRD pin or register configuration
• Nonvolatile EEPROM storage for user-programmed settings
• Glitchless output enable and low-power shutdown modes

Applications

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

Procurement Notes

Verify the specific suffix '266+' against official documentation to confirm lead-free/RoHS compliance status. Confirm availability through authorized distributors as standard stock levels vary. Ensure the 8-pin µSOP package matches the target PCB footprint requirements.

Selection Notes

Select this component when a 5V supply is available and spread-spectrum clocking is required for EMI mitigation. Verify that the 2-wire serial interface is compatible with the system controller. Consider the 0°C to +70°C operating temperature range for environmental suitability.

Part Context

This part belongs to the Maxim Integrated DS1086 EconOscillator family. It is functionally similar to the DS1089 but utilizes a different package (µSOP vs SO) and potentially different default configurations. The 'U' designation indicates the µSOP package type.

Replacement Considerations

Direct replacements include other DS1086 variants such as DS1086Z+ (SO package). Cross-model substitution with DS1089 requires verification of pinout compatibility and register settings due to potential differences in default frequencies and package types.

FAQ

How is the dithering amount selected?

The dithering amount is set to 2% or 4% by configuring the J0 bit in the PRESCALER register or by controlling the SPRD pin voltage level.

What is the default output frequency?

The factory default master oscillator frequency is 97.1 MHz, resulting in a default output frequency based on the default prescaler setting.

Can the device operate without a microprocessor?

Yes, because all settings are stored in nonvolatile EEPROM, the DS1086 can operate in a standalone mode after initial programming.