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Specifications
Digital Inputs (TTL Compatible)
• Logic High: 2.0 to 5.0 VDC
• Logic Low: -0.5 to +0.8 VDC
• Load: ±20 μA
Digital Outputs
• Logic High: 2.0 VDC min., source 32 ma
• Logic Low: 0.55 VDC max., sink 64 ma
Optional Counter/Timers
• Type: 82C54 programmable interval counters (up to three)
• Output drive: Source 2.5 mA, sink 24 mA
• Input Gate: TTL/CMOS compatible
• Clock: On-board, 1 MHz crystal-controlled oscillator
• Active Count Edge: Negative edge (falling edge)
• Minimum Clock Pulse Width: 30 ns high, 40 ns low
• Timer Range: 16 bits (x3 per i8254)
• Power Output: Resettable 0.5A fused +5 VDC from computer bus
Power Required
• Basic Unit: +5 VDC at 170 mA typical if no current is drawn from
the auxiliary fused +5 VDC output
• With One Counter: +5 VDC at 190 ma
• With Two Counters: +5 VDC at 210 ma
• With Three Counters: +5 VDC at 230 ma
Environmental
• Operating Temperature Range: 0 °C. to 60 °C
• Storage Temperature Range: -50 °C. to +120 °C
• Humidity: 0 to 90% RH, non-condensing
• Size: 4.8" Long (122 mm)
Manual PCI-DIO-24DH
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