• 48 digital I/O lines
• Channels simulate 8255 PPI mode 0
• Buffered circuits for higher driving capacity than the 8255
• Bit 0 of port C can generate an interrupt to IRQ 2 to 7
• Interrupt triggering rising/falling edge
• Output status readback
• Pin-compatible with Opto-22 I/O module racks
• Transfer rate: 300 Kb/sec typical, 400 Kb/sec Maximum
• Digital output: Logic level 0: 0.5V max @ 24mA sink
• Digital input:
  Logic level 0: 0.8V max
  Logic level 1: 2.0V min
• Power requirement:
  +5V @ 500 mA (typical)
  +5V @ 800 mA (max)