18QHTF21-63.7955-PD

Overview

The 18QHTF21-63.7955-PD is a standard crystal oscillator manufactured by Mercury Electronics Ind. Co., Ltd. It operates at a fixed frequency of 63.7955 MHz and utilizes LVCMOS output logic levels. The device is designed for low-power applications, featuring a supply voltage of 1.8V. A key functional characteristic is the inclusion of a standby mode, allowing for power-down control to minimize energy consumption when the oscillator is not actively required in the circuit.

Feature Summary

• Supports LVCMOS output logic for digital interface compatibility
• Includes standby functionality for power management
• Operates on a single 1.8V supply rail

Applications

• Portable electronic devices requiring low power consumption
• Digital signal processing circuits
• Communication modules with standby requirements

Procurement Notes

Verify the specific frequency tolerance and load capacitance requirements against your design specifications before procurement. Ensure that the 1.8V supply voltage aligns with your system's power architecture. Confirm that the LVCMOS output swing is compatible with the input thresholds of the receiving component. Check the package dimensions for PCB layout constraints.

Selection Notes

Select this component when a precise 63.7955 MHz clock source is needed with minimal power usage. The 1.8V operation makes it suitable for battery-powered or energy-efficient systems. Consider the standby feature if power cycling is part of the operational cycle. Ensure the LVCMOS output level matches the downstream logic family to avoid signal integrity issues.

Part Context

This model belongs to the QHTF series of surface-mount oscillators from Mercury Electronics. These components are characterized by their small footprint and low current consumption. The 'PD' suffix typically indicates the presence of a power-down pin or function, distinguishing it from continuous-operation variants within the same frequency and voltage class.

Replacement Considerations

Direct replacements must match the 63.7955 MHz frequency, 1.8V supply, LVCMOS output, and 4-SMD no-lead package. Verify that substitute parts support the standby/power-down feature if required by the design. Cross-reference with other Mercury Electronics models in the 18QHTF21 series for potential equivalents.