104-DIO-48S and 104-DIO-24S

Main Features:

  • 48 or 24 parallel lines of 82C55 digital I/O with tristate buffers prevent unintended control of external equipment
  • IRQ on input change of state (COS) eliminates the need for constant polling
  • High sink/source current 64mA/32mA
  • I/O pulled up to 5V for contact monitoring
  • Compatible with Opto-22 and other industry standard I/O racks


Factory Options:

  • 82C54 with three 16-bit counter/timers for event counting, frequency output, pulse width and frequency measurement
  • 0 to 70°C and -40 to +85°C versions available
  • Economy version without COS feature
  • Pull-down resistors on I/O lines
  • RoHS Available. Please contact us for ordering information



Digital I/O:

  • Programmable Peripheral Int.: 82C55A
  • Channels: 24 or 48, pulled up to 5V via 10K
  • Buffered Channels: 24 or 48 bits (ports A, B, C-High and C-Low)
  • Sink & Source Current: 64mA & 32mA
  • Modes supported: Mode 0
  • Change of State Detection: 48 Inputs (both 8255 groups, all 8 ports)
  • Throughput: Up to 1 MByte/sec
  • Power Output: Resettable fused +5V @ 500mA per 50 pin connector


Couter / Timer:

  • Peripheral Interface Timer: Type 82C54
  • Counters: 3 x 16-Bit down counters
  • Clock Frequency: 1 MHz Time Base, available to the user
  • Software Support: Event Counter, Frequency Output, Frequency and Pulse Measurement
  • Max Input Frequency: 10MHz
  • Signal Type: TTL



  • Power Required: +5V @50mA Typical
  • Operating temperature: 0°C to +70°C, optionally -40°C to +85°C available
  • Storage temperature: -50° to +120°C
  • Interrupt Requests: Eleven channels, IRQ 3-7, 9-12, 14, 15
  • Interrupt Status Registers: Two; One 8bit for COS, One single bit for C/T






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Contact Details

EPS-Tech Ltd.

Industrial park, Tzur-Igal
2 Bazelet St,

Israel, 44862

Tel: +972-9-749-8585
Fax: +972-9-749-8686
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.