18QHTF21-21.760-PD

Oscillators Overview

The 18QHTF21-21.760-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a nominal frequency of 21.76 MHz with an LVCMOS output logic level. The device requires a supply voltage of 1.8V and features a standby or power-down function for energy management. It is housed in a compact 4-SMD, no-lead package with dimensions of 2.0 x 1.6 mm. This component is designed for timing applications requiring precise clock signals in low-voltage digital systems.

Oscillators Feature Summary

• LVCMOS output interface compatible with standard digital logic families
• Integrated standby mode enabling power-down functionality
• Compact surface-mount package suitable for space-constrained designs

Oscillators Applications

• Clock signal generation for embedded microprocessors
• Timing reference for communication interfaces
• Power management circuits requiring low-voltage oscillators

Oscillators Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against your circuit design before ordering. Ensure the 1.8V supply rail is stable to maintain oscillator performance. Confirm that the PCB footprint matches the 4-SMD no-lead package specifications provided in the official datasheet to avoid assembly issues.

Oscillators Selection Notes

Select this component when a 21.76 MHz clock source is required with LVCMOS compatibility. Consider the 1.8V operating voltage constraint and the need for a power-down feature. Evaluate the 2.0x1.6mm package size against available board space. Compare against other Mercury Electronics models in the 18QHTF21 series if different frequencies are needed.

Oscillators Part Context

This part belongs to the 18QHTF21 series of surface-mount crystal oscillators from Mercury Electronics. The series offers various standard frequencies with consistent LVCMOS outputs and 1.8V operation. The 'PD' suffix indicates the inclusion of a power-down control feature, distinguishing it from standard continuous-operation variants within the same package family.

Oscillators Replacement Considerations

Direct substitutes include other 18QHTF21 series parts with identical pinout and electrical characteristics but different frequencies, such as 18QHTF21-25.000-PD, if frequency adjustment is permissible. Cross-reference with Mercury Electronics documentation to ensure functional equivalence regarding standby behavior and output drive strength.