Cost-Effective Test Screening Method on 40-nm Embedded SRAMs for Low-Power MCUs

Embedded static random access memories (SRAMs) with cost-effective test screening circuitry are demonstrated for low-power microcontroller units (MCUs). The probing test step at the low temperature (LT) of -40 °C is obviated by imitating pseudo-LT (PLT) conditions in the package test, where a sample is measured at room temperature (RT). Monte Carlo simulation is carried out considering local V
_t
variations as well as contact soft open failure (high resistance), confirming good minimum operating voltage ( V
_min
) correlation between LT and PLT conditions. Test chips with two types of 4-Mbit single-port SRAM macros and 1-Mbit dual-port SRAM macro are designed and fabricated using low-power 40-nm CMOS technology. Measurement results demonstrate that the proposed test method reproduces LT conditions and screens out LT failures with less overscreening. The proposed test method eliminates 1/3 or more of the test costs.