Datum bc637VME-C GPS Time Frequency Processor IRIG-B 10MHz VME w/ User Guide

Datum bc637VME-C GPS Time Frequency Processor IRIG-B 10MHz VME w/ User Guide

The Datum bc637VME-C is a single-width VME module that provides precision time and frequency reference to a host computer and connected data acquisition systems. Manufactured by Datum Inc.'s Bancomm Division (San Jose, CA), the bc637VME-C is housed in a -C Size Adapter Chassis and acquires time from either GPS satellites via an external antenna/receiver or from time code signals — most commonly IRIG-B. This listing includes the bc635VME/bc350VXI User's Guide Rev. B and the bc635VME-CSize Manual Addendum (Configuration 9800208, Revision E thru H, dated March 16, 1998).

Specifications & What's Included

• Model: bc637VME-C (Datum Inc. / Bancomm Division)
• Configuration: c/f-9800248
• Form factor: Single-width VME module in -C Size Adapter Chassis
• Bus interface: VMEbus
• Time inputs: GPS (external antenna/receiver) or time code (IRIG-B, 2137, XR3)
• Oscillator: Disciplined 10 MHz oscillator, rate-matched to input time source
• Time resolution: 100 nanoseconds; current time accessible across bus with zero latency
• Time range accessible: days to 100 nanoseconds
• Battery-backed real-time clock
• Frequency outputs: 1 MHz, 5 MHz, 10 MHz
• Pulse output: 1 PPS (1 Pulse Per Second) with interrupt
• Programmable periodic pulse rate output / interrupt
• Programmable time strobe output / interrupt (single predetermined time)
• External event time capture — latches time of an external TTL pulse and/or generates bus interrupt
• Front panel: LED digit display (hours, minutes, seconds); DB-15 GPS connector; BNC inputs (In Dist, In Port2)
• Multi-OS driver support available for integration
• Includes: bc635VME/bc350VXI User's Guide Rev. B (spiral-bound)
• Includes: bc635VME-CSize Manual Addendum, Configuration 9800208, Revision E thru H (March 16, 1998)

Applications

The bc637VME-C belongs to the Datum/Bancomm family of GPS-disciplined time and frequency processor boards, designed for VMEbus-based systems that require a precision, traceable time reference. These modules are used in applications where accurate timestamping is critical: military and government command-and-control systems, radar and signal intelligence platforms, telecommunications synchronization, test and measurement setups, and scientific data acquisition systems. The VMEbus form factor was a dominant standard in embedded and real-time computing from the 1980s through the 2000s, particularly in defense, aerospace, and industrial control applications. The bc637VME-C's ability to accept both GPS and IRIG-B inputs makes it especially flexible in environments where GPS is not directly available but a facility-wide IRIG time distribution system is already in place. Modules of this type continue to be sought by legacy VMEbus system integrators and organizations maintaining long-lifecycle systems requiring hardware-synchronized, GPS-traceable timing.