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«Serial Non-Volatile Memories Serial EEPROM, Serial Flash and Application Specific Standard Products STM i c r o e l e c t r o n i c ...»

Serial Non-Volatile Memories

Serial EEPROM, Serial Flash

and Application Specific Standard Products


STM i c r o e l e c t r o n i c s

More Intelligent Solutions

Serial Non-Volatile Memories

A Broad Range

Serial Non-Volatile Memories are the most flexible type of non-volatile memories, featuring Byte level write, without

the need to erase the data before writing a new value. This makes them ideal for parameter storage.

The new fast high density EEPROMs and Serial Flash allow code storage, saving board space and reducing pin count.

Serial Flash families feature “sector erase/page programming” and “page erase/page programming". This enables a finer storage granularity compared to standard Flash, but doesn't match the byte level granularity performance of serial EEPROM.

Serial non-volatile memories are present in a large range of applications where small size and low cost are essential, such as cellular phones, printers, car radios, camcorders and set-top boxes.

The booming telecommunications market relies heavily on EEPROMs, due to their energy optimization and improved user-friendliness of cell-phone handsets, DECTs, telephones and modems.

For consumer applications, ST's serial non-volatile memories take full advantage of the company's many years experience in this market. ST is a significant player in the automotive field, as well as in the fast changing computer & peripheral market, both of which are prime users of non-volatile memories.

Technology and Products ST has a dynamic roadmap for the development of both process technology and serial non-volatile devices.

The EEPROM road map will reach a 0.35µ technology in the year 2002/03 and will have the capability to produce EEPROM up to 1 Mbit density and above should the market require this. The Serial Flash road map, on the other hand, will reach 0.18n technology and will have the capability to produce competitive Serial Flash in-line with market requirements.

ST’s large portfolio in serial non-volatile memories extends from low-density 256 bits up to 8 Mbit. All ST's serial non-volatile memories are supported by datasheets, application notes and VHDL behavioral description files, making them easy to use and implement.

Most serial non-volatile memories are available in 5 different voltage ranges: 4.5V to 5.5V, 2.5V to 5.5V, 2.7V to

3.6V, 1.8V to 5.5V and 1.8V to 3.6V..

The target endurance of EEPROMs is over 1 million erase cycles with more than 40 years data retention.

ST offers a wide range of packages including PSDIP, TSSOP, SO and the advanced LGA and SBGA (Chip Scale Package).

PSDIP8 TSSOP8 SO8N SO8W LGA SBGA actual size: 8x4 mm actual size: 1.7x1.9 mm Package illustrations are not to scale.

Serial Non-Volatile Memories Serial EEPROM I2C, SPI and MICROWIRE ® Buses ST EEPROM products are the standard of reference in the industry, built with sub-micron technology and providing leading performances. The range includes: serial access EEPROMs with low cost, 400 kHz, 2-wire I2C buses and densities up to 1 Mbit; fast 1 MHz MICROWIRE bus types with densities from 256 bit to 16 Kbit; and very fast 5 MHz SPI bus types with densities up to 1 Mbit.

I2C I2C types are the most suitable for applications with multiple devices on the bus and where fast bus speed is not required.

The bus operates at a clock speed of 400 kHz and supports a supply voltage down to 1.8V.

–  –  –

SPI For those applications that require a high-speed transfer rate, the SPI bus is preferable. With speed up to 5 MHz available now and densities from 512 Kbit to 1 Mbit available soon, this bus is rapidly gaining market accaptance. SPI EEPROM also provide a HOLD input, which allows the bus master to freeze the data transfer at any time without data loss. In addition, the memory array can be write protected when driving the Write Protect pin.

–  –  –

Serial Flash: a high speed, low voltage family in an 8 pin package ST's family of high-speed low-voltage Serial Flash memories features a four-wire SPI-compatible interface and provide guaranteed compatibility with future higher and lower density devices. Running at 20 MHz or above, they set the industry speed record for serial non-volatile memories.

The Serial Flash is available in 2 versions: “sector erase/page programming” and “page erase/page programming”, which are complementary subfamilies. These address different target markets, defined by the memory function requested (code versus parameters storage) and the granularity/cost trade off chosen by the customer (sector versus page erase).

The high speed serial solution creates added-value for applications requiring fast download of code, such as personal computer add-on cards, including graphic cards, SCSI cards and network cards, hard disk drives, digital cameras, DVDs, cellular phones, fax, answering machines and car radio.

–  –  –

ASSP (Application Specific Standard Products) Application Specific Standard Products provide optimal features, each targeted at a given application. Such optimized solutions are already used in CRT monitors, DRAM modules and analog cards (ACR). ASSPs provide designers with an improved overall cost and performance and are built on a common non-volatile technology platform, allowing multiple memory types - EPROM, Flash, EEPROM. The ASSP product range offers various types of interfaces: serial (I2C, SPI, MICROWIRE buses), RF contactless access and customized.

–  –  –

Custom requests can be supported by modifying the interface and protocol, logic, partitioned memory blocks and access control to support specific form factors. Such a solution might be a contactless product. Products designed on particular requests and/or for a special purpose, provide designers with the means to incorporate or protect intellectual property by integrating custom features or by providing security. For example, ST produces EEPROM modules for authentication of ink and tape cartridges.

Serial Non-Volatile Memories Serial Non-Volatile Memories in all High Tech Applications

Many new applications require Serial EEPROM and Serial Flash devices, especially in the following market segments:

Automotive (engines, dashboards, car radios, airbags and ABS), Telecom (GSM, phones, answering machines, fax, modems, networking), Consumer (TV, set-top boxes, monitors, camcorders, audio MP3) and Computer (hard disk drivers, motherboards, CD-ROMs, modems, keyboards, printers).


The automotive market is a key target for ST Serial Non-Volatile Memories.

ST has built a strong leadership in Serial EEPROM for this market by meeting the stringent requirements of car makers for applications such as engine management, ABS, airbags, car radios, odometers and telematics.

ST's leading position in Serial Non-Volatile Memories for the Automotive market is based upon quality, support and a broad range portfolio


• Standard Serial Non-Volatile Memories (EEPROM and Flash technologies), from 1 Kbit to 8 Mbit, with SPI, I2C and MICROWIRE buses.

• Automotive products operating at the -40/+125°C temperature range; available in SPI, I2C and MICROWIRE bus versions and tested according to High Reliability Certified Flow.

• Bare die devices for the Automotive market, tested at 125°C and 150°C using Known Good Die program; available in SPI, I2C and MICROWIRE bus versions.

Consumer ST Serial Non-Volatile Memories cover a wide spectrum of digital consumer applications. By working with the world leading consumer system manufacturers, ST is deeply involved in the process of performance enhancement and integration of these applications.

ST has become a leading supplier to the consumer segment, offering a broad range portfolio widely used for digital TVs, set-top boxes, DVDs,

audio MP3 and camcorders:

• 1.8V-5.5V 1 Kbit to 16 Kbit I2C EEPROMs are very cost-effective for Remote Control applications.

• 4 Kbit to 16 Kbit I2C EEPROMs bring flexibility for channel frequency and user setting storage in TVs. The EEPROM size can be defined at the last moment and can be upgraded to a higher density when needed.

• 32 Kbit to 256 Kbit I2C EEPROMs are common choices for high end TV, DTV, set-top boxes and DVD.

• When fast access is required in MP3 players or camcorders, 64 Kbit to 256 Kbit SPI EEPROMs are the best option, with a possible migration to Serial Flash.

• When space is limited new SBGA (Chip Scale Package) packages provide the answer: 16 Kbit I2C (M24C16-S) in advanced DVD, 16 Kbit SPI (M95160-W) in camcorders.

Serial Non-Volatile Memories Computer and Peripherals The evolution of computers and peripherals depends essentially on progresses within the semiconductor industry. The introduction of high-speed processors demanding more memory, as well as new, lower cost PCs and printer solutions, is stimulating the semiconductor market and is driving Serial Non-Volatile Memories product portfolio development towards more added-value solutions.

ST brings its know-how and long experience in this field, to provide a range of memories for CD-ROMs, keyboards, DVD-ROMs, motherboards, graphics cards, monitors, processor boards and modems. Computer applications often use

standard memories but they may also use Application Specific Standard Products:

–  –  –

Telecom ST Serial Non-Volatile Memories have over 10 years' successful experience in the telecom segment. The telecom market is mainly driven by mobile phones, but also by important applications, such as corded and cordless phones, base stations, networking and switching, where numerous parameters need to be stored. These include RF parameter settings, serial numbers, last called numbers, usage restrictions, short numbers, message services, diaries, production data and identification, etc.

In mobile applications, I2C and SPI buses are often used with high density EEPROM (up to 1Mb). 2 Kbit to 64 Kbit densities are commonly utilized in corded and cordless applications, with a supply voltage of 1.8V in the DECT field. Low-density devices are mainly used in networking and base stations. In terms of packaging, the TSSOP8 and the LGA8 are very attractive for the cellular market, whereas the SO8 Narrow remains the standard for all other applications. Serial Flash products with “page erase/page programming” are the ideal solution for Telecom applications

that require higher densities for parameter storage:

–  –  –

the right bus, the right density and the right power supply from the largest serial EEPROM portfolio. The M34C00 and M34C02 are particularly noteworthy as they provide a user-lockable area and 100% safe storage of manufacturing settings.

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