DS1077U-125+

Overview

The DS1077U-125+ is a dual-output, programmable fixed-frequency oscillator in an 8-pin µSOP package. It features a factory-trimmed internal master oscillator set to 125.000MHz. The device generates two synchronous outputs via on-chip prescalers and a divider, with frequencies ranging from 8.1kHz to 133MHz. It operates on a single 5V supply with ±0.5% initial tolerance and frequency variation over temperature. Configuration is managed through a 2-wire serial interface, with settings stored in nonvolatile EEPROM memory for retention upon power-up.

Feature Summary

• Dual low-jitter synchronous outputs (OUT0 and OUT1) derived from a 125MHz master clock
• Nonvolatile EEPROM storage retains frequency and control register settings without external components
• 2-wire serial interface supports standard (100kHz) and fast (400kHz) modes for on-the-fly programming
• Configurable power-down mode reduces standby current to 5µA maximum

Applications

• Processor-controlled frequency synthesizers requiring precise clock generation
• Standalone oscillators for digital systems needing specific submultiples of the master frequency
• Clock distribution networks where minimal board area and no external components are required

Procurement Notes

Verify the ordering suffix 'U' confirms the 8-pin 118mil µSOP package variant. Confirm the '-125' designation corresponds to the 125.000MHz master frequency option. Ensure the '+' suffix indicates lead-free compliance if required by assembly specifications. Cross-reference the specific revision level against the latest Analog Devices documentation to ensure compatibility with existing design constraints.

Selection Notes

Select this model when a fixed 125MHz master frequency is required. The µSOP package is suitable for space-constrained designs compared to the standard SO package. Verify that the application requires only two output channels, as the device does not support additional independent outputs. Ensure the system voltage remains within the 4.75V to 5.25V range for optimal performance and adherence to specified electrical characteristics.

Part Context

The DS1077 series belongs to the EconOscillator family, designed to replace discrete crystal oscillator circuits. The DS1077U-125+ specifically utilizes the µSOP footprint, offering a compact solution for embedded applications. This component integrates the oscillator, prescalers, and divider into a single chip, eliminating the need for external resonators or capacitors typically required in traditional oscillator designs.

Replacement Considerations

Direct pin-compatible replacements include other variants within the DS1077 family, such as DS1077Z-125+ (SO package) or different frequency options like DS1077U-133+. Substitution requires verification that the master frequency and output configuration meet the target circuit requirements. No functional changes are implied by package variations alone.