ST M440T1MV 3.3V 32 Mbit (1024 Kbit x 32) TIMEKEEPER SRAM handbook

The M440T1MV 3.3V, 32 Mbit (1024 Kbit x 32) TIMEKEEPER® SRAM is an ultra-low power SRAM that integrates a real-time clock, power-fail control circuit, battery, and crystal. It also features precision power monitoring and power switching circuitry, and automatic write-protection when VCC is out-of-tolerance.