ISM95-3251AH-27.000MHZ

Oscillators Overview

The ISM95-3251AH-27.000MHZ is a standard CMOS crystal oscillator manufactured by ILSI, operating at a fixed frequency of 27 MHz. It functions as a clock source with a supply voltage of 3.3V and features an enable/disable control pin for power management. The device utilizes a ceramic package in a surface-mount configuration, specifically the 4-SMD, no-lead form factor with dimensions of 2.0 mm x 2.5 mm. It outputs HCMOS/TTL compatible logic levels, ensuring compatibility with standard digital circuits. The component is designed for low jitter performance without PLL-based architecture, suitable for precise timing applications requiring stable frequency output.

Oscillators Feature Summary

• CMOS output compatible with TTL and HC-MOS logic families
• Integrated enable/disable functionality for power control
• Low jitter non-PLL based oscillation design
• Ceramic surface-mount package construction

Oscillators Applications

• Fibre Channel server and storage systems
• SONET/SDH network equipment
• 802.11 Wi-Fi communication modules
• T1/E1 and T3/E3 system clocking

Oscillators Procurement Notes

Verify the specific suffix 'AH' against the manufacturer's current part number guide to confirm pinout and electrical specifications match the required design. Ensure the 3.3V supply voltage aligns with the target circuit's power domain. Confirm that the 4-SMD no-lead package footprint corresponds exactly to the PCB layout guidelines provided in the official datasheet to prevent assembly errors.

Oscillators Selection Notes

Select this component when a 27 MHz clock signal is required for high-speed digital interfaces. The choice depends on the need for CMOS logic level compatibility and the integration of an enable pin to manage system power states. Consider the physical constraints of the 2.0 mm x 2.5 mm package size relative to available board space. Evaluate the jitter specifications against the sensitivity of the receiving clock input to ensure signal integrity.

Oscillators Part Context

This oscillator belongs to the ISM95 series from ILSI, which focuses on small-form-factor ceramic packaged oscillators. The series typically offers various frequencies and voltage options within a standardized 4-SMD footprint. The ISM95-3251AH variant specifically denotes the 27 MHz frequency point and the associated electrical characteristics defined by the AH suffix, distinguishing it from other frequency or voltage variants within the same product line.

Oscillators Replacement Considerations

Direct substitutes must match the 27 MHz frequency, 3.3V operation, and 4-SMD no-lead package. Verify that any alternative part maintains identical logic level compatibility (HCMOS/TTL) and provides similar enable/disable functionality. Cross-reference the mechanical dimensions to ensure the replacement fits the existing footprint without modification.