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Serial SRAM

Serial SRAM is a stand-alone volatile memory that offers you an easy and inexpensive way to add more RAM to your applications. These 8-pin low-power, high-performance SRAM devices have unlimited endurance and zero write times, making them ideal for applications involving continuous data transfer, buffering, data logging, audio, video, Internet, graphics and other math and data-intensive functions. These devices are available from 64 Kbit up to 1 Mbit in density and support SPI, SDI and SQI™ bus modes.


Serial NVSRAM offers nonvolatile RAM storage and is ideal for applications that need to write very often to the memory. This device is significantly lower cost than other nonvolatile RAM devices, and the data is backed using an external battery. This 8-pin, SPI device supports unlimited instantaneous writes to the memory array, making it ideal in applications such as meters, data loggers, data recorders or black boxes. These devices are available in 512 Kbits and 1 Mbit densities.

RAM Expansion Options

There have traditionally been two ways to increase an application’s RAM:

  1. Use a larger microcontroller (MCU): this option is less attractive if you must buy a larger, more expensive MCU just to get more RAM
  2. Use external parallel RAM: but parallel RAM uses large packages and typically requires at least 16-20 I/Os
Serial SRAM offers you the flexibility to add RAM to you design without the disadvantages of a large MCU or parallel RAM and uses the simple 4-pin SPI interface. These devices also offer improved performance with the SDI and SQI interface that offers up to a 4x improvement in data rates.


Application Notes

Title D/L

AN1245 - Recommended Usage of Microchip SPI Serial SRAM Devices

AN1269 - Using C30 Compiler to Interface Serial SRAM Devices to dsPIC33F and PIC24F D/L
AN1277 - Using C32 Compiler to Interface Serial SRAM Devices to PIC32 MCUs D/L
AN1287 - Using C18/HI-TECH C Compiler to Interface Serial SRAM Devices to PIC16F/PIC18F Microcontrollers D/L


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Serial SRAM in 2 Minutes

Short value video explaining what Serial SRAM is and how to use it.

Memory Product Comparison

  Explore Products Explore Products Explore Products Explore Products Explore Products Explore Products  Explore Products Explore Products
Density 128 bit - 4 Mb 64 Kb - 1 Mb 256 Kb - 8 Mb 512 Kb - 64 Mb 1 - 64 Mb 64 Kb - 1 Mb 512 Kb - 1 Mb 4 Kb - 1 Mb
Clock Frequency 0.4 - 20 MHz 70 ns 45 ns 20 - 104 MHz 55-70 ns 16 - 20 MHz 16 - 20 MHz 1 - 66 MHz
Cost/Bit High High High Low Low Medium Medium Medium
Read Times Medium Fast Fast Medium Fast Medium Medium Medium
Write Times Medium Fast N/A Medium Fast Instantaneous Instantaneous Instantaneous
Pin Count 2 to 8 pins 28 and 32 pins 28 to 44 pins 8 pins 32 and 48 pins 8 pins 8 pins 8 pins
Data Retention 200+ Years 10 Years 10 Years 100+ Years 100+ Years Volatile 20+ Years
(with battery)
100+ Years
Typ. Standby Current 1 µA 200 µA 100 µA ~15 µA ~30 µA ~4 µA ~4 µA ~40 µA
Voltage 1.7 V - 5.5V 2.7V,
1.65V - 1.95V,
2.7V - 3.6V,
2.3V - 3.6V
1.65V - 1.95V,
2.7V - 3.6V,
4.5V - 5.5V
1.65V - 1.95V,
2.5V - 5.5V
2.5V - 5.5V 2.7V - 3.6V,
4.5V - 5.5V
Temperature -55°C to +150°C 1 -55°C to +125°C -40°C to +85°C -40°C to +125°C 1 -40°C to +85°C -40°C to +125°C -40°C to +85°C -40°C to +125°C 1

1. Selected densities