The Microchip/Datum bc637PCI-U is a PCI Local Bus Time and Frequency Processor card delivering precise time and frequency synchronization to host computers and data acquisition systems. It acquires accurate time from GPS satellites or traditional time code signals such as IRIG B, maintaining synchronization through a disciplined 10 MHz oscillator. The card provides zero-latency time reads across the PCI bus with 100 nanosecond clock resolution, enabling high-speed time requests without computational delay. A flywheel mechanism maintains timekeeping if the primary source fails, while a battery-backed RTC preserves time during power loss with 10 PPM accuracy. Universal PCI signaling supports both 3.3 V and 5.0 V operation.
Technical Specifications
• Model: bc637PCI-U
• Manufacturer: Microchip / Datum
• Bus Interface: PCI Local Bus with 3.3 V / 5.0 V universal signaling
• Oscillator: Disciplined 10 MHz
• Clock Resolution: 100 nanosecond
• Battery-Backed RTC: 10 PPM accuracy
• Time Synchronization Accuracy: 170 ns RMS to UTC (related bc637PCI-V2)
– Key Features
• GPS and time code acquisition (IRIG A, IRIG B, IRIG G, IRIG E, NASA 36, XR3, 2137)
• Simultaneous AM and DCLS modulation support for inputs and outputs
• Frequency outputs: 1 PPS and 10 MHz, plus programmable 1/5/10 MPPS rate generator
• Frequency inputs: 1 PPS and 10 MHz
• External Event Capture Register with interrupt capability
• Programmable time compare output/interrupt
• Flywheel operation during input source loss
– Typical Applications
• Real-time data acquisition requiring UTC traceback
• Precision frequency generation and distribution
• Time-stamped event logging and synchronization
• Laboratory and field timing standards
– Compatibility & Integration
The bc637PCI-U integrates into standard PCI systems. It translates multiple IRIG and NASA time code standards while generating compatible output formats. AM and DCLS time code interfaces accommodate legacy and modern installations.
