ISM97-6251AH-66.666MHZ

Oscillators Overview

The ISM97-6251AH-66.666MHZ is a standard CMOS oscillator manufactured by ILSI, designed for surface-mount applications. It operates at a nominal frequency of 66.666 MHz with a supply voltage range of 2.85 V to 3.15 V, centered at 3.0 V. The device features a 4-pin SMD package without leads and supports an operating temperature range from -40 °C to +85 °C. Key electrical parameters include a maximum jitter of 0.5 ps RMS (1 sigma) in the 12 MHz–75 MHz band and 0.7 ps RMS (1 sigma) in the 76 MHz–150 MHz band. Total integrated jitter is specified as 0.7 ps and 0.9 ps respectively for these frequency ranges. The output load is 15 pF, and the duty cycle is typically 50% ±10%.

Oscillators Feature Summary

• Low jitter performance utilizing non-PLL based architecture.
• CMOS logic levels compatible with lead-free processing standards.
• Integrated enable/disable functionality controlled by supply voltage thresholds.

Oscillators Applications

• SONET/SDH system clock generation.
• T1/E1 and T3/E3 telecommunications interfaces.
• 802.11 Wi-Fi network infrastructure.

Oscillators Procurement Notes

Verify RoHS compliance status through official manufacturer documentation prior to procurement, as conflicting data exists regarding lead-free certification across different sources. Confirm that the specific ordering suffix matches the required frequency tolerance and package variant. Ensure the component meets the intended environmental operating temperature range for the target application.

Oscillators Selection Notes

Select this model when a 66.666 MHz CMOS output is required with low phase noise characteristics. Consider the 4-pin SMD form factor for space-constrained PCB layouts. Evaluate the 15 pF output load requirement against downstream circuit impedance. Verify compatibility with 3.3 V logic systems and confirm the enable/disable pin configuration aligns with system power management strategies.

Oscillators Part Context

This component belongs to the ISM97 series of surface-mount oscillators from ILSI. The series is characterized by HCMOS/TTL output compatibility and low jitter specifications. The part utilizes a ceramic or plastic package depending on the specific sub-series designation, offering a compact solution for high-frequency timing applications in telecommunications and networking equipment.

Oscillators Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Cross-referencing requires matching the 66.666 MHz frequency, 4-pin SMD package, 3.3 V supply voltage, and CMOS output type. Verify physical dimensions and pinout compatibility before substituting with other manufacturers' oscillators.