mPCIe 24-Channel Digital I/O with Change-of-State (COS)

  • Description
  • Specifications
  • Ordering Guide
  • Optional Accessories

The mPCIe-DIO-24S is a 2260/2280 size mPCIe Card and optional cable assembly (D-Sub 37-pin Male connector) designed to be easily panel-mounted in any application environment. It uses the high speed PCI Express bus to transfer digital data to and from the card. The digital I/O is compatible with 8255 PPI chips making it easy to program.

The card provides three 8-bit I/O ports designated A, B and C. Port C can be further divided into two 4-bit nybbles. Each port can be programmed as inputs or outputs. Change of State (COS) detection and interrupt capabilities are designed to relieve software from polling routines that can consume valuable processing time. Each port can be programmed for detecting state changes on their lines, in which any changes of the enabled port’s bits (low-to-high or high-to-low) will generate an IRQ. An ISR (interrupt service routine) then determines which bit changed state and clears the interrupt.

The mPCIe-DIO-24S is excellent for use in applications sensing inputs such as switch closures, 5V, LVTTL, CMOS logic and controlling external relays, driving indicator lights, and more.

Number of DIO 24
Compatibility 8255 Mode 0
Performance 1 μs per 32-bit transaction max, ∼3.5μs in  Windows®
Digital Inputs Logic High: 2.0V to VCCIO (3.3VDC, 5VDC tolerant)
Logic Low 0V to 0.8V
Digital Outputs
(Standard version)
Logic High: 2.0V (min) 24mA source
Logic Low: 0.55V (max) 24mA sink
Power Output: +3.3 VDC via 0.5A polyfuse (resetting)
Power Required +3.3VDC @ 330ma (typical)
Form Factor PCIe MiniCard full size
Dimensions 50.95 x 30mm
Operating temperature 0°C to 70degC (standard)
-40ºC to +85ºC (Add -T)
Operating humidity 5% to 95% noncondensing
Weight 6.2g


Model Description
mPCIe-DIO-24S mPCIe 24 Digital I/O with Change-of-State (CoS) IRQ
mPCIe-DIO-24 mPCIe 24 Digital I/O
Option: -T -40ºC to +85ºC
Option: -TTL for CMOS signaling w/user supplied VCCIO (+5V)


Model Description
CAB-mPCIe-DB37M 40-pin to DB37-pin male cable
CAB-mPCIe-40P 40-pin to 40-pin discreet cable
ADAP37 Direct connect screw terminal adaptor for use with 37-pin male connector
STB-37 DIN-rail mountable screw terminal board for 37-pin connector
STA-37 37-pin screw terminal board
CAB37-18 Ribbon cable, female 37-pin connectors on each end, 18″
CAB37-36 Ribbon cable, female 37-pin connectors on each end, 36″
CAB37MF-36 Ribbon cable, male to female 37-pin connectors, 36″
CAB37FM-18 Ribbon cable, male to female 37-pin connectors, 18″
mPCIe-HDW-KIT2 2mm mounting hardware
mPCIe-HDW-KIT2.5 2.5mm mounting hardware