What's The Use Of A Crystal Oscillator Module
A Crystal Oscillator Module is a self contained Crystal Controlled Oscillator, housed in a sealed metal can. It is powered by a 5V DC supply, and usually produces a TTL (Transistor-Transistor-Logic) compatible square wave output signal at a nominated frequency. Some Modules that operate at very high frequencies (usually above 100 MHz) produce an ECL (Emitter-Coupled-Logic) compatible output clock. The frequency of operation is either printed, or stamped on the top of the metal can.
The pinout of the device can be referenced to a standard 8 pin DIP package where pins 8 and 4 are Power (VCC) and Ground (GND) connections, while Pin 5 is the clock output. Pin 1 (shown with a dot next to it) is normally not used, but is sometimes configured as an output enable control line (active low). The device is normally leaded, and thus described as a through hole component, however the leads can be carefully bent to form a J-lead configuration for SMT (Surface Mount Technology) applications, if required.
Most Electronic Technicians, and Engineers would consider a Crystal Oscillator Module to be functional if it produced a stable output clock within its frequency tolerance. Unfortunately, this is not always the case! Crystal Oscillator Modules are notorious for suffering from mechanical stress issues, due to poor quality practices in the Manufacturing process. As the Crystal Oscillator Module works within specification - 'most of the time', being able to identify functional failures can be extremely challenging. In the final product,Crystal Oscillator Module failures are readily seen during mechanical vibration tests on a Vibration table. However, adding to this issue - most Organizations don't have access to a Vibration table, and Vibration Testing is not usually part of the Final product Integration plan.
To help provide rapid identification of intermittent Crystal Oscillator Modules in a Repair or Manufacturing operation - I would recommend the construction of a simple Test Rig made up of five D-type Flip Flops (74XX74 Series). These components are packaged as 14 pin devices (DIP or SOIC), with two D-type FF in each package. In other words, this design requires three IC's (designated U1 to U3). This design could be reduced down to only two IC's however it is easier to find 8 MHz Crystal Oscillator Modules than 4 MHz parts.
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A Crystal Oscillator Module is a self contained Crystal Controlled Oscillator, housed in a sealed metal can. It is powered by a 5V DC supply, and usually produces a TTL (Transistor-Transistor-Logic) compatible square wave output signal at a nominated frequency. Some Modules that operate at very high frequencies (usually above 100 MHz) produce an ECL (Emitter-Coupled-Logic) compatible output clock. The frequency of operation is either printed, or stamped on the top of the metal can.
The pinout of the device can be referenced to a standard 8 pin DIP package where pins 8 and 4 are Power (VCC) and Ground (GND) connections, while Pin 5 is the clock output. Pin 1 (shown with a dot next to it) is normally not used, but is sometimes configured as an output enable control line (active low). The device is normally leaded, and thus described as a through hole component, however the leads can be carefully bent to form a J-lead configuration for SMT (Surface Mount Technology) applications, if required.
Most Electronic Technicians, and Engineers would consider a Crystal Oscillator Module to be functional if it produced a stable output clock within its frequency tolerance. Unfortunately, this is not always the case! Crystal Oscillator Modules are notorious for suffering from mechanical stress issues, due to poor quality practices in the Manufacturing process. As the Crystal Oscillator Module works within specification - 'most of the time', being able to identify functional failures can be extremely challenging. In the final product,Crystal Oscillator Module failures are readily seen during mechanical vibration tests on a Vibration table. However, adding to this issue - most Organizations don't have access to a Vibration table, and Vibration Testing is not usually part of the Final product Integration plan.
To help provide rapid identification of intermittent Crystal Oscillator Modules in a Repair or Manufacturing operation - I would recommend the construction of a simple Test Rig made up of five D-type Flip Flops (74XX74 Series). These components are packaged as 14 pin devices (DIP or SOIC), with two D-type FF in each package. In other words, this design requires three IC's (designated U1 to U3). This design could be reduced down to only two IC's however it is easier to find 8 MHz Crystal Oscillator Modules than 4 MHz parts.
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