DS1077LU-40+

Overview

The DS1077LU-40+ is a dual-output, programmable fixed-frequency oscillator from the DS1077L series. It operates on a single 2.7V to 3.6V supply and requires no external components. The device features an internal master oscillator trimmed to 40MHz, which can be routed directly or through prescalers (P0, P1) and a programmable divider (N). Outputs range from 4.87kHz to 40MHz with ±0.5% initial tolerance and ±1.25% variation over temperature and voltage. Configuration is managed via a 2-wire serial interface, with settings stored in nonvolatile EEPROM.

Feature Summary

• Dual synchronous outputs (OUT0, OUT1) with frequencies adjustable in submultiples of the 40MHz master clock
• Nonvolatile EEPROM storage for frequency settings and control registers
• 2-wire serial interface supporting standard (100kHz) and fast (400kHz) modes
• Power-down mode with standby current of 10µA

Applications

• Processor-controlled frequency synthesizers
• Stand-alone solid-state oscillators
• In-circuit on-the-fly frequency programming
• Fixed-frequency clock generation for digital systems

Procurement Notes

Verify the package type corresponds to the 'U' suffix for the 8-pin 118mil µSOP. Confirm the '40' designation indicates the 40MHz master frequency option. Check for RoHS compliance status as indicated by the '+' suffix in ordering information. Ensure the specific revision matches the required application constraints.

Selection Notes

Select this model when a 40MHz master frequency is required. Choose between SO (Z) and µSOP (U) packages based on board space constraints. Consider the DS1077LU-50+, -60+, or -66+ variants if higher master frequencies are needed. Verify that the output frequency range (4.87kHz to 40MHz) meets the system requirements.

Part Context

The DS1077LU-40+ belongs to the DS1077L family of 3V EconOscillators/Dividers. Other members include DS1077LU-50+, DS1077LU-60+, and DS1077LU-66+, differing primarily in their factory-trimmed master oscillator frequencies (50MHz, 60MHz, and 66.666MHz respectively). All share the same pinout, interface, and functional architecture.

Replacement Considerations

Direct replacements within the same family include DS1077LU-50+, DS1077LU-60+, and DS1077LU-66+. These parts are pin-compatible but offer different master frequencies. Ensure the new part's frequency range covers the required output specifications.