A methodology to characterize device-level endurance in 1T1C (1-transistor and 1-capacitor) FRAM

We present a mimicking methodology to describe device-level endurance in a 1T1C, 64 Mb FRAM (ferroelectric random access memory). Device-level endurance of FRAM must clarify all the issues raised from destructive read-out READ/WRITE. To explore endurance properties in a real-time operational situation, we have established a measurement set-up that covers asymmetric pulse chains corresponding to Data 1 (D1) and Data 0 (D0) READ/RESTORE over a frequency range from 1.0 to 7.7 MHz. The cycle-to-failure of 5.9 × 10
²⁴
cycles in an operational condition of 7.7 MHz and 85 °C, has been obtained from extrapolation to VDD = 2.0 V in a voltage acceleration. We compare testing results with those of D1-D0 populations of bit-line potential.