PC/104+ Quad 10/100Mbps Ethernet + 24 DIO

  • Description
  • Specifications
  • Ordering Guide
  • Optional Accessories

The MRC-424-XT is a PC/104+ module that integrates 4 PCI-based 10/100 Ethernet ports with 24 user-configurable digital I/O lines in the compact and rugged PC/104 format. This 2-in-1 combination of Ethernet and digital I/O helps lower the size and cost of your embedded system by eliminating one additional board from your PC/104 stack.

The Ethernet ports are driven by dual Micrel KSZ8842 Mac + Phy PCI controller chips, two ports per chip, and are NE2000 compatible. Each chip has a unique MAC address; therefore, only two Ethernet ports are visible to the end user for active communication. The other two ports work in switch fashion to enable daisy chaining of networks with one port on the chip as an uplink to a network while the other port provides active communication on the network.

The 24 digital I/O lines are based on an 82C55 chip and feature programmable direction in 4- and 8-bit groups. All I/O lines contain user-configurable 10K ohm pull-up resistors for convenience.

No. of Ethernet ports 4
Controllers Dual Micrel KSZ8842 Mac + Phy PCI controller chips
Protocol IEEE 802.3 10Base-T and 100Base-TX compatible
Maximum data rate 100Mbps
No. of Digital I/O lines 24
Direction Programmable: Ports A and B individually programmable for all input or all output
Port C programmable in 4-bit groups for input or output
Input voltage Low: -0.5V min, 0.8V max
High: 2.0V min, 5.5V max
Output voltage Low 0.0V min, 0.4V max
High 3.0V min, Vcc – 0.4V max
Output current 2.5mA max, each line
Pull-up resistors 10KOhms pull-up
Bus PC/104+
Dimensions 3.55″ x 3.775″ (PC/104+ standard)
Power supply +5VDC 10%
Operating Temperature -40 to +85°C


Model Description
MRC-424-XT PC/104+ Quad 10/100Mbps Ethernet + 24 DIO


Model Description
C-PRZ-02 Ethernet cable, 6-pin to RJ-45