Seiko Instruments (SII) announced availability of the S-25A series of SPI Serial EEPROMs, specifically designed for use in the highly demanding automotive market. The ground-breaking S-25A EEPROMs set industry performance records by achieving 500,000 writes at 125ºC, and up to 50 year data retention. Using SII’s proprietary know-how, the new EEPROMs are screened to eliminate electronic leakage bit-errors; achieve a 4 ms. write time (5 to 10 ms is typical for other manufacturers); and use special low power and voltage fluctuation detection circuits to prevent errors caused by electrical noise or variations.

Today’s automobile designs increasingly require higher performance EEPROMs in on-board systems that control the car’s operation, fuel consumption, and ensure the passenger’s comfort and safety. Along with the requirement for increased EEPROM capacity, automotive applications also require extremely high reliability and security. The SII S-25A series was developed to specifically answer the needs of the automotive market.

The S-25A series of SPI Serial EEPROMs are a SPI serial E2PROM which operates under the high temperature, at high speed, with low current consumption and the wide range operation. The S-25A080A/160A/320A respectively has the capacity of 8 Kbit, 16 Kbit, 32 Kbit and the organization of 1024 words × 8-bit, 2048 words × 8-bit, 4096 words × 8-bit, is able to Page Write and sequential read. While conventional EEPROMs typically have significantly degraded write performance at high temperature, the S-25A series assures performance of up to 500, 000 writes at 125ºC, and 1,000,000 writes at 85ºC, along with retention of the EEPROM data for as long as 50 years.

Product features

1. Wide range operation Read: 2.5 V to 5.5 V ; Write : 2.5 V to 5.5 V
2. Function to prevent malfunction by monitoring clock pulse
3. Operation frequency 6.5 MHz (4.5 V to 5.5 V, at -40°C to +125°C)
4. SPI mode (0, 0) and (1, 1)
5. Endurance: 106cycles/word (at +85°C), 8 x 105cycles/word (at +105°C), 5 x 105cycles/word (at +125°C)
6. Page Write: 32 bytes / page
7. Sequential read
8. Monitors Write to the memory by a status register
9. Memory capacitance: S-25A080A 8 Kbit ; S-25A160A 16 Kbit ; S-25A320A 32 Kbit
10. Write protect: Software, Hardware
11. Protect area: 25%, 50%, 100%
12. Data before shipment: Memory array FFh, SRWD = 0, BP1 = 0, BP0 = 0
13. Write protect function during the low power supply
14. CMOS schmitt input( /CS , SCK, SI, /WP , /HOLD )
15. Data retention: 100 years (at +25°C), 50 years (at +125°C)
16. Packages: 8-Pin SOP (JEDEC)
17. Lead-free product

Typical automotive applications include vehicle engine, transmission, and EPS control systems; ABS, ESC (Electronic Stability Control), and airbags; key-less entry, air-conditioning, dashboard displays, and BCM (Body Control Module). The S-25A series of SPI Serial EEPROMs is offered in a wide range of memory capacities from 1k to 64k. SII forecasts sales of 10 million pieces annually.

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