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PCI Digital I/O with On-board Counter/Timers

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Interworld Electronics has released the PCI-DIO-96C3 from Acces I/O. The PCI-DIO-96C3 is a 96 line digital input/output card with counter/timer capabilities designed for use in high I/O density applications. I/O connections are made via four industry standard 50-pin header connectors. The card is 12.25 inches long (312 mm) and may be installed in any full-length 5V PCI-bus (or PCI-X bus) slot in X86 type PC's.

The card contains four type 8255-5 Programmable Peripheral Interface (PPI) chips. They can be programmed to accept inputs or to provide outputs on three 8-bit ports: designated Ports A, B, and C. Port C can be further divided into two 4-bit ports.

Each I/O line is buffered by a type ABT245 tristate buffer transceiver capable of sourcing 32 mA or sinking 64 mA. The buffers are configured under program control for input or output use according to direction control signals from the control register inside the PPI. 10K Pull-up resistors (to +5 VDC) on the card assure that there are no erroneous outputs at power-up until the card is initialized by system software.

The PCI-DIO-96C3 features three 82C54 counter/timer chips providing a total of nine 16-bit down counters with each I/O pin brought to a header connector. The counters can be field configured by on board jumpers in a variety of useful ways to measure frequency, count pulses, measure pulse width, generate frequencies, etc. An onboard 1 MHz crystal controlled clock provides a timing reference pulse.

The PCI-DIO-96C3 is supplied with a CD containing driver DLL's, Windows setup programs, and a suite of sample programs.

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