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Manufacturer Part #


FM31 Series 256 Kb (32 K x 8) 3 V 3 us 2-Wire SMT Integrated Processor SOIC-14

Mfr. Name: Cypress
Standard Pkg:
Product Variant Information section
Date Code: 1607
Product Specification Section
Technical Attributes
Attributes Table
Memory Density: 256kb
Interface Type: 2-Wire
Memory Organization: 32 K x 8
Supply Voltage-Nom: 2.7V to 5.5V
Access Time-Max: 3µs
Temperature Range: -40°C to +85°C
Package Style:  SOIC-14
Mounting Method: Surface Mount
Features & Applications

The Ramtron Processor Companion is a single chip solution that replaces discrete components to reduce cost and board space. This integrated F-RAM enhanced Ramtron system management solution supports virtually any microcontroller or microprocessor-based design.

Ramtron's Processor Companion devices combine fast read/write performance and unlimited endurance of nonvolatile F-RAM with a real-time clock (RTC), processor supervisor and other highly-integrated peripherals used in processor-based systems.

All Ramtron F-RAM products have three distinct properties that differentiate them from other nonvolatile memory technologies: 

Fast write speed - F-RAM performs read and write operations at the same speed. Because F-RAM writes data at bus speed, there are no delays before the written data becomes nonvolatile. Floating gate memories have long write delays of 5 milliseconds. F-RAM writes in nanoseconds, essential in applications like auto safety systems.

High endurance - F-RAM offers virtually unlimited write endurance, which means it doesn’t wear out like other nonvolatile memory devices. Floating gate devices experience a hard failure and stop writing in as little as 1E5 cycles, making them unsuitable for high-endurance applications.

Low power consumption - F-RAM operates without a charge pump, enabling low power consumption. Floating gate devices demand high voltage during write operations. F-RAM writes at the native voltage of the manufacturing process: 5V, 3V, or even less on more advanced processes.


Please note the Ramtron FM31256-G Processor Companion is Not Recommended for New Designs -- please see FM31278 (5 V) or FM31L278 (3 V).

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