JT 2122/MPV

Digital I/O Scan (DIOS) module with up to 128 or 133 ‘boundary-scannable’ I/Os in a standard DIMM-168 format.

To increase the test coverage of a printed circuit board the JT 2122/MPV fits directly in 168-pin DIMM sockets mounted on a PCBA to test the connectivity of those sockets.

The TAP signals can be accessed via the ‘fingers’ of the 168 pin module connector or a separate 10-pin connector. A TAP-out can be used to daisy-chain to another DIOS module or to a scan chain on the target board. The JT 2122/MPV is often used in conjunction with a JT 2702/DDC Dual DIMM Carrier ‘break-out’ board to create a high-density DIOS module. Two JT 2122/MPVs can be housed in one JT2702/DDC will provide 256 channels in a small footprint, ideal for mounting in test fixtures.


  • Low cost
  • Increase test coverage
  • Improve diagnostic resolution
  • High-channel count DIOS system
  • Small, low-profile package is ideal for mounting ‘in-fixture’
  • Compatible with JT 2702/DDC break-out board

Use JT2122 DIMMs in conjunction with a JT2702 DIMM carrier to provide low-cost high channel count I/O within custom test fixtures. For example a generic test system comprising PSUs, JTAG Controller/Pod, DIOS modules, relays etc. can be built-in into a fixture-kit with ‘Bed Of Nails’ test adapters that may be built as ‘personality modules’ for each board type.

  • 1.8v to 5.0V PSU accepted
  • Thresholds set by supply voltage – inputs 5V tolerant
  • Set-up in 8 blocks of 16 channels each ‘bypassable’
  • 45 MHz maximum TCK tolerant

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