The M48Z58-70PC1 with NVRAM 64K (8Kx8) 70ns is a PC serial, low-power nonvolatile-memory manufactured by STMicroelectronics. The M48Z58-70PC1 is a 8K x 8-bit static RAM that uses a nonvolatile memory cell to store the data when the power is removed. It has a maximum operating temperature range of -55 °C to +125 °C. This NVRAM has a self-refresh mode, a standby current down to 1 µA and a closure time less than 3ms. This makes it suitable for a variety of embedded systems and time critical applications.