Pin to Pin test

Pin to Pin leakage test is performed in a similar fashion as Pin to Vcc/Vss leakage test. In general, two pins are charged or driven to opposite states (Vss and Vcc or low and high) for a first predetermined time with Boundary Scan. After the pins reach the opposite states, they are allowed to float or to be unconnected. The pins leak toward each other and if neither has significant leakage to Vcc or Vss eventually establish a steady state of approximately one-half the value of Vcc (Vcc/2). At a second predetermined time, the state each of the pins is sampled using Boundary Scan. Based on the state of each of the pins, a pass/fail result is determined. In the following detailed description, for simplicity, only leakage testing of pins 122-0 and 122-1 are described; other pins (1222-N) are tested in the same manner.