High-Performance Boundary-Scan Digital I/O Module

Complete boundary-scan testability is often out of reach with the unit under test (UUT) alone. Chip-to-chip interconnects can be tested internally with boundary-scan, but external I/O is necessary for that final elusive piece of test coverage.

That’s where the Corelis ScanIO-300LV comes in. Each ScanIO-300LV module adds up to 300 channels of boundary-scan-controlled digital I/O to test systems. The ScanIO works with Corelis JTAG controllers for easy and quick integration.

Featuring a JTAG control interface, 300 signal pins per module, configurable voltage, LVDS support, and per-connector bypass, the ScanIO-300LV is the perfect way to extend test coverage.


  • High-performance, high pin-count boundary-scan I/O module.
  • Up to 300 single-ended or 150 differential individually controlled boundary-scan controllable digital I/O lines per module.
  • JTAG and digital I/O port voltages are configurable from 1.25V to 3.3V in 15 increments, or as LVDS logic (I/O ports only).
  • Each group of 50 I/Os can be bypassed to optimize scan time.
  • Includes BSDL files for integrating the ScanIO-300LV with UUTs.
  • TAP output port for single-chain configurations—one JTAG port can control the ScanIO and the UUT.
  • Fully compatible with any IEEE-1149.1 compliant controller.
  • Supports any test pattern generator capable of using a BSDL file.

The ScanIO-300LV digital I/O module combined with an IEEE-1149.1 controller provides additional digital interconnect capabilities to any test system. Using boundary-scan technology, each ScanIO-300LV module provides a total of 300 fully bidirectional test channels with virtually unlimited memory depth per pin. Included boundary-scan description language (BSDL) files allow the ScanIO-300LV to be used with any boundary-scan automated test program (ATPG) generation software, including Corelis ScanExpress TPG™.


ScanIO-300LV TAP Connector Pinout

The ScanIO-300LV is also fully integrated with Corelis ScanExpress Merge™ for easy integration with existing test procedure files. The ScanIO-300LV TAP and boundary-scan I/O voltage can be configured from 1.25V to 3.3V using the front panel rotary switch. Each set of two connectors can be configured as 100 individual, bidirectional channels, or as 50 LVDS differential pairs. Multiple ScanIO-300LV modules can be daisy chained together or with the UUT for easily expandable I/O capability.


ScanIO-300LV Single Chain Test Configuration



Component Test & Verification

Add boundary-scan capabilities to incoming inspection systems to test the internal scan path and bonding by exercising the electrical path between component leads and internal semiconductor.

Connector & Cable Testing

Add boundary-scan test coverage to open edge connectors, cables, and test points on any UUT.

Non-scannable Element Testing

Use the ScanIO to add boundary-scan and as a virtual “bed-of-nails” tester—even with components that do not natively feature boundary-scan.


  • Add test coverage to system connectors. The ScanIO-300LV provides the interconnections required to detect open and short faults.

  • Reduce cost. The ScanIO-300LV provides boundary-scan stimulus-and-response at a fraction of the cost of traditional bed-of-nails.

  • Compatible with existing automatic test pattern generators, including the complete Corelis ScanExpress™ family of test products.

Ordering Information

Part Number 10364

Includes ScanIO-300LV module, 20-pin TAP cable, power supply, and six 60-pin I/O interface cables.

Also Available: ScanDIMM

For memory socket test applications, see the Corelis ScanDIMM series of boundary-scan DIMM socket testers.

Need Assistance?

We’re here to help!

If you would like assistance with implementing JTAG testing in your design, or you are simply short of resources, our talented and experienced engineering staff can help you with all your JTAG needs.

Get Started with Corelis

By submitting this form, you are consenting to receive marketing emails from: Corelis Inc., You can revoke your consent to receive emails at any time by using the SafeUnsubscribe® link, found at the bottom of every email. Emails are serviced by Constant Contact

Looking for help? Get in touch with us