DS1087LU-21H+T&R

Overview

The DS1087LU-21H+T&R is a factory-programmed, spread-spectrum clock generator from the DS1087L series. It produces a dithered square-wave output with frequencies ranging from 130kHz to 66.6MHz. The device operates on a 2.7V to 3.6V supply and features nonvolatile EEPROM storage for settings. Key electrical parameters include an active supply current of 5mA typical at 3.3V, a standby current of 5µA in power-down mode, and a duty cycle of 45% to 55%. It supports selectable 2% or 4% dithering via a 2-wire serial interface.

Feature Summary

• Factory programmed square-wave generator with frequencies up to 66.6MHz
• Integrated spread-spectrum capability for EMI reduction (2% or 4% selectable)
• Nonvolatile EEPROM storage retains settings without external backup
• Glitchless output-enable control and programmable power-down mode

Applications

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

Procurement Notes

Verify the specific frequency and dither percentage associated with the '21H' suffix against official documentation, as standard tables list discrete values like 2.048MHz or 10MHz. Confirm the '+T&R' designation indicates tape-and-reel packaging. Check current availability status, as this component may be subject to limited supply or end-of-life restrictions.

Selection Notes

Select this component when a fixed-frequency, low-component-count oscillator with built-in EMI spreading is required. Ensure the master oscillator frequency allows for the desired output division ratio. Verify that the 2-wire interface voltage levels are compatible with the controlling microcontroller. Consider the operating temperature range of -40°C to +85°C for environmental suitability.

Part Context

The DS1087LU-21H+T&R belongs to the DS1087LU family of EconOscillators. The 'LU' suffix typically denotes the industrial temperature range (-40°C to +85°C) and the µSOP-8 package. The 'T&R' suffix specifies the reel packaging format. This part integrates the oscillator, divider, and EEPROM into a single solution, replacing discrete crystal and buffer circuits.

Replacement Considerations

Direct replacements within the same family include other DS1087LU variants with different factory-programmed frequencies, such as DS1087LU-210+T&R (10MHz). Cross-family replacements would require verifying pin compatibility and electrical specifications against alternatives like the DS1085 or DS1086 series.