Ferroelectric RAM (FRAM) Basics and Applications

This page provides an introduction to Ferroelectric RAM (FRAM). We’ll cover the basics, applications, and list some manufacturers. FRAM stands for ferroelectric random access memory.

This memory combines the fast read/write access of dynamic RAM with non-volatility and ultra-low power consumption. Because it doesn’t use ferrous materials, FRAM chips aren’t affected by magnetic fields.

FRAM is used in various applications including:

• Medical equipment
• Automotive systems
• Instrumentation
• RFID tags
• Microcontrollers
• Electronic metering
• Wearable devices

The rise of the Internet of Things (IoT) has driven the demand for affordable wearable devices, making FRAM even more relevant.

As shown in Figure 1, a FRAM memory cell consists of a capacitor connected to a plate and a bit line. The orientation of the dipole within the capacitor determines whether a “1” or a “0” is stored. This dipole orientation can be set and reversed by applying voltage across either line.

Ferroelectric RAM Application Note

Ferroelectric RAM from Fujitsu Semiconductor offers the following specifications:

• Model No: MB85RS1MT
• Bit configuration: 131072 x 8 bits
• SPI interface support
• Frequency of operation: 1.8V-2.7V @ 25MHz, 2.7V-3.6V @ 30MHz
• Package type: 8 pin SOP with RoHS compliance

FRAM is often considered superior to EEPROM and Flash memory. The following table highlights the differences between these memory types, based on research by Texas Instruments.

Ferroelectric RAM Manufacturers/Vendors

Here are some popular Ferroelectric RAM manufacturers and vendors:

• DigiKey
• Fujitsu
• Texas Instruments
• Ramtron International Corporation
• Cypress Semiconductor
• Celis Semiconductor