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Product Detailed Parameters
- Description：8.589935 MHz XO 1.8V 2.0X1.6 PD
- Series：18QHTF21
- Mfr：Mercury Electronics Ind. Co. Ltd
- Package：Strip
- Base Resonator：Crystal
- Type：XO (Standard)
- Frequency：8.589935 MHz
- Function：Standby (Power Down)
- Output：LVCMOS
- Voltage - Supply：1.8V
- Frequency Stability：±50ppm
- Absolute Pull Range (APR)：-
- Operating Temperature：-40°C ~ 85°C
- Spread Spectrum Bandwidth：-
- Current - Supply (Max)：21mA
- Ratings：-
- Mounting Type：Surface Mount
- Package / Case：4-SMD, No Lead
- Size / Dimension：0.079" L x 0.063" W (2.00mm x 1.60mm)
- Height - Seated (Max)：0.031" (0.80mm)
- Supplier Device Package：-
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Overview
The 18QHTF21-8.589935-PD is a standard LVCMOS crystal oscillator manufactured by Mercury Electronics Ind. Co. Ltd. It operates at a nominal frequency of 8.589935 MHz with a supply voltage of 1.8V. The device features a compact 4-SMD, no-lead package with dimensions of 2.0mm x 1.6mm and a height of 1.2mm. It supports a power-down mode for standby functionality and is designed for operation within a temperature range of -40°C to +85°C.
Feature Summary
- Generates a precise 8.589935 MHz clock signal using LVCMOS output logic
- Operates on a low 1.8V supply voltage for energy efficiency
- Includes a dedicated power-down pin to enable standby mode
- Utilizes a small footprint 4-SMD surface-mount package
Applications
- Video processing systems requiring standard NTSC/PAL timing frequencies
- Embedded controllers needing low-power clock sources
- Portable electronic devices utilizing 1.8V logic levels
- Industrial control modules operating in extended temperature ranges
Procurement Notes
Verify the specific load capacitance requirements against the target circuit design before integration. Confirm that the 1.8V supply rail remains stable under all operating conditions to ensure frequency accuracy. Check the latest datasheet for any updates regarding the power-down sequence or electrical characteristics. Ensure the PCB layout accommodates the 2.0x1.6mm package dimensions correctly.
Selection Notes
Select this component when a standard video frequency is required alongside low-voltage operation. Compare the 1.8V variant against other voltage options if system power rails differ. Consider the 4-SMD package size constraints relative to available board space. Evaluate the power-down feature necessity for battery-operated applications versus always-on designs.
Part Context
This part belongs to the H21 series of surface-mount oscillators from Mercury Electronics. The series focuses on providing reliable clock signals in compact packages suitable for modern electronics. Mercury Electronics has extensive experience in quartz frequency control products since 1973.
Replacement Considerations
Direct substitutes include other 8.589935 MHz LVCMOS oscillators with identical 1.8V supply and 4-SMD 2.0x1.6mm footprints. Verify pin compatibility and electrical specifications before swapping manufacturers.
