DS1087LU-4CL+

Overview

The DS1087LU-4CL+ is a factory-programmed clock generator producing a spread-spectrum square-wave output. It operates within a 2.7V to 3.6V supply range and delivers frequencies up to 66.6MHz with selectable 2% or 4% dithering for EMI reduction. The device features a 2-wire serial interface, nonvolatile EEPROM storage, and glitchless output-enable control. Packaged in an 8-pin µSOP, it supports power-down modes and programmable frequency division for standalone or processor-controlled applications.

Feature Summary

• Factory programmed square-wave generator from 130kHz to 66.6MHz
• No external timing components required
• EMI reduction via 2% or 4% selectable dithered output
• Nonvolatile settings stored in EEPROM

Applications

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

Procurement Notes

Verify the component's authenticity by checking the manufacturer markings against official datasheet specifications. Confirm the package type matches the 8-pin µSOP (118 mils) outline. Ensure the operating temperature range meets the -40°C to +85°C requirement for the intended environment. Cross-reference the part number suffixes to confirm voltage and packaging details.

Selection Notes

Select this model when a fixed-frequency, spread-spectrum clock source is needed without external crystals. The DS1087LU-4CL+ provides a specific factory-set frequency and dither percentage. Use the internal prescaler if lower frequencies down to 130kHz are required. Ensure the system design accommodates the 2-wire serial interface for potential configuration changes.

Part Context

The DS1087LU-4CL+ belongs to the DS1087L EconOscillator family, which integrates a master oscillator and prescaler into a single chip. This series eliminates the need for discrete timing components, simplifying PCB layout. The 'LU' designation indicates the industrial temperature range and µSOP package variant.

Replacement Considerations

Direct replacements must match the 8-pin µSOP footprint and 2.7V–3.6V supply range. Verify that substitute devices support the same 2-wire serial interface protocol and offer comparable spread-spectrum capabilities. Check for pin compatibility and electrical characteristics such as duty cycle and load capacitance limits.