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Appendix A
Specifications
Timing I/O
PCI-4451/4452 User Manual
Digital logic levels
Level
Input low voltage
Input high voltage
Input low current (V
Input high current (V
Output low voltage (I
Output high voltage (I
Power-on state ........................................Input (High-Z)
Data transfers ..........................................Programmed I/O
Number of channels................................2 up/down counter/timers,
Resolution
Counter/timers .................................24 bits
Frequency scaler..............................4 bits
Compatibility ..........................................TTL/CMOS
Base clocks available
Counter/timers .................................20 MHz, 100 kHz
Frequency scaler..............................10 MHz, 100 kHz
Base clock accuracy................................±0.01%
Max source frequency.............................20 MHz
Min source pulse duration .....................10 ns, edge-detect mode
Min gate pulse duration .........................10 ns, edge-detect mode
Data transfers ..........................................DMA, interrupts,
= 0 V)
in
= 5 V)
in
= 24 mA)
OL
= 13 mA)
OH
1 frequency scaler
programmed I/O
A-8
Min
Max
0.0 V
0.8 V
2.0 V
5.0 V
—
320 µA
—
10 µA
—
0.4 V
4.35 V
—
© National Instruments Corporation
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