If you're hunting for battery-less 1MB serial nvSRAM chips, we suggest you two new products from different vendors based on nearly same technology. One is from the Cypress Semiconductor, pioneer of this technology, and the other is from Germany-based Anvo-Systems Dresden, who fully focuses on this technology.
The new nonvolatile SRAM chips from Cypress Semiconductor comes with Quad serial peripheral interface (SPI) with access time of 45 ns and operating at 108 MHz clock speed. Cypress uses SONOS (Silicon Oxide Nitride Oxide Silicon) technology in making these nvSRAMs. SONOS is compatible with standard CMOS technologies and offers advantages such as high endurance, low power, and radiation hardness.
nvSRAM provides 24MBps random read/write access time with unlimited write cycles with data retention life of 20 years. Cypress semiconductor is already offering nvSRAM chips with parallel interface, now with these SPI interface chips, the size of the chip comes down and also your PC board.
CY14V101QS 1Mb nvSRAM is available in16-pin SOIC package and 24-ball BGA package. The device also includes an optional integrated real-time clock (RTC) with +/- 50ppm uncalibrated accuracy.
Cypress says its nvSRAM chips offers lower power consumption by a factor of 5.8 (active) and a factor of 10 (sleep) compared to competitive devices.
The CY14V101QS 1Mb nvSRAM is sampling today with production expected in the third quarter of 2015.
More or less closely similar product 1Mb ANV32AA1W serial non- volatile SRAM (nvSRAM) from Anvo-Systems Dresden is also based on SONOS flash storage technology. The clock speed rate of ANV32AA1W is 66 MHz.
ANV32AA1W with double memory architecture is organised as 128 K words of 8-bit each and supports SPI modes 0 and 3. The other features of ANV32AA1W includes integrated Power Down functionality (hibernate mode) with a standby current Ihib of less than 1 μA, 60 μs recover-time from PowerDown mode, safety features, such as checksum protected memory accesses (Secure READ and Secure WRITE) and Time Monitoring.
ANV32AA1W operates from the supply voltage of 2.7 V to 3.6 V and is available in 8-pin DFN and 16-pin 169 mil TSSOP packages for commercial and industrial (-40°C to +85°C) temperature ranges.
The suggested applications include:
Transaction logs for CNC and robotics, Parameter logs for process control, Touch screen control panels in industrial control;
logging of data in smart meters, smart Grid, medical electronics applications and telemedicine;
RAID storage, buffer memories for printers are major applications in computing and IT.
These no battery embedded nvSRAMs can replace SRAM, EPROM and EEPROM without any complex additional circuitry.
Cypress explains the concept of software store in one of its White Paper titled "Nonvolatile SRAM (nvSRAM) Basics"
as "Software STORE Data is transferred from the SRAM to the nonvolatile memory by a software address sequence. The software STORE cycle is initiated by executing sequential or controlled read cycles from six specific address locations in exact order. During the STORE cycle, an erase of the previous nonvolatile data is first performed, followed by a program of the nonvolatile elements. After a STORE cycle is initiated, further input and output are disabled until the cycle is completed."
To learn more on nonvolatile memory chips from Cypress including FRAM visit its website at: www.cypress.com/products/nonvolatile-products.
To access the products from Anvo-Systems Dresden visit its website at http://anvo-systems-dresden.com/products/