Ramtron Offers Two Tiny Half Megabit Serial FRAM Products for Industrial Control

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Ramtron has extended its serial memory portfolio with the FM24C512, a 512kB nonvolatile RAM with a 2-wire interface, and the FM25L512, a 512kB, 3V nonvolatile RAM with SPI interface. They are pin-compatible replacements for equivalent EEPROMs, only better. These devices collect critical data at bus speed, with virtually unlimited endurance and low power.

Ramtron also offers the FM20L08, a one-megabit (Mbit), 3V nonvolatile FRAM product in a 32-pin TSOP (thin small outline plastic) package.

 

APPLICATIONS Meters Printers Motor control applications Increased data collection and storage capacity in a tiny package

 

FM24C512 FEATURES - 2-WIRE Organized as 65,536 x 8-bits High endurance 10 billion Read/Writes 45 year data retention NoDelay™ Writes Advanced high reliability Ferroelectric process Up to 1MHz maximum bus frequency Supports legacy timing for 100kHz and 400kHz 5V operation 250µA active current (100kHz) 120µA standby current Industrial temperature -40°C to +85°C

FM25L512 FEATURES - SPI Organized as 65,536 x 8-bits Unlimited Read/Write cycles 10 year data retention NoDelay™ Writes Advanced high reliability Ferroelectric process Up to 20MHz frequency Direct hardware replacement for EEPROM SPI Mode 0 and 3 (CPOL, CPHA=0,0 and 1,1) Hardware protection Software protection Low voltage operation 3.0V – 3.6V 20µA standby current Industrial temperature -40°C to +85°C

 

Serial 2-Wire - FM24C512

 

 

Application Notes for Serial 2-Wire FRAM Memory

Interrupting a 2-Wire Read (PDF)
The industry standard 2-wire bus is a robust protocol for a variety of applications. Unfortunately, it has one limitation that system developers may encounter. Interrupting a memory read in progress may be difficult. The 2-wire protocol does not offer a graceful method to accomplish this. This situation is not unique to the serial FRAM devices, but this application note explains the method for clearing the condition.

 

Microchip MCU to 2-Wire FRAM (PDF)

This application note provides source code to interface Microchip microcontrollers to Ramtron 2-wire FRAM devices. Although the specific example uses a Microchip PIC16X7x and PIC16C8x with the FM24C04 memory, it is intended to be useful for other Microchip devices as well. It highlights the performance improvement gained by fast FRAM writes, as well as the interface simplification. This application note was written by Bob Axtell of Micro-Firmware. Contact information is provided within the application note.

 

Differences in FM24Cxx and FM24CxxA (PDF)

There are differences between “A” and “non-A” two-wire 4Kb and 16Kb FRAM devices. The FM24C04 and FM24C16 memory devices operate up to 400kHz, whereas the FM24C04A and FM24C16A operate at speeds up to 1MHz. There is also a functional difference between A and non-A parts, which involves the write protect pin WP. The original non-A parts protect the upper half of the memory array when WP is high. The new A parts protect the entire memory array when WP is high. Lastly, the A devices implement an internal pull down on the WP pin.

 

 

Serial SPI - FM25L512

 

 

FM20L08 - 1Mbit Bytewide FRAM Memory

Interface: Parallel
Density: 128Kb x 8
Speed: 60ns
Idd:22mA
Vdd: 3.3V +10%, -5%
Package: 32T

 

A Word about High Endurance

FRAM is known for high write endurance. Until now, some applications needed more cycles than FRAM could offer. No longer! The FM20L08 offers virtually unlimited read/write cycles. You can now access each address a million times per second for hundreds of years with no wear out.

 

1Mbit Ferroelectric Nonvolatile RAM

• Organized as 131,072 x 8-bits
• 10 year data retention
• Unlimited read/write cycles
• NoDelay™ writes

 

Added Features

• Page Mode Operation to 33MHz
• Voltage monitor drives lockout signal
• Software Write Protect scheme
• Advanced High Reliability Ferroelectric Process

 

Superior to Battery Backed SRAM

• No battery concerns
• Monolithic reliability
• True surface mount solution, no rework steps
• Superior for moisture, shock and vibration
• Resistant to negative voltage undershoots

 

SRAM Compatible

• JEDEC 128Kx8 SRAM pinout
• 60ns Access Time
• 150ns cycle time extended temperature
• 350ns cycle time industrial temperature

 

Low Power Operation

• 3.13V to 3.63V operation
• 22mA active current
• 25uA standby current

 

Industry Standard Configuration

• Industrial temperature -40°C to +85°C
• Extended temperature -20C to +85C
• 32-pin TSOP Type 1

 

 

 

 Featured Products

Part Number		Description	Data Sheet	App. Notes
FM20L08-60-TG		1Mbit 3V FRAM Memory
FM24C512-G		512KB Serial FRAM Memory
FM25L512-DG		512KB 3V SPI FRAM Memory

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