The S-25A Series is SII's latest SPI bus serial automotive EEPROM featuring operability in severe environments (-40 to +125ºC) and a range of high speed processing via a computer control unit (ECU). This highly reliable memory also delivers a high rewrite capability (1 million rewrites at +85ºC or 500,000 rewrites at +125ºC), excellent data retention (data retained for 50 years in a 125ºC environment), a short write time (4 ms max.), a range of malfunction prevention functions (low voltage detection circuit, erroneous write instruction cancellation function, Schmitt input), and a wide operating temperature range (-40 to +125ºC).
The S-25A Series lineup includes memory capacities of 1 K-bit, 2 K-bit, 4 K-bit, 8 K-bit, 16 K-bit, 32 K-bit, and 64 K-bit.
The S-25A Series can be used in a variety of automotive applications, including driving applications (engine, transmission, EPS, etc.), safety applications (ABS, attitude control, air bags, etc.), and comfort & body control applications (keyless entry, car air conditioning, meters, BCM, etc.).
- For the 1 K-bit, 2 K-bit, and 4 K-bit products, click the product overview of S-25A010A/020A/040A.
- For the 8 K-bit, 16 K-bit, and 32 K-bit products, click the product overview of S-25A080A/160A/320A.
- Contact an SII sales office for details of the 64 K-bit products.
SII's non-volatile memories have a proven 20-year record of excellent functionality, reliability and quality. This performance is achieved due to the formation of a highly reliable ultra-thin tunnel oxide film and the use of SII's original screening technology to completely screen for bit errors, such as missing charge, which cause most of the defects in EEPROM devices.
Through the use of these technologies, SII's S-25A Series can provide a guaranteed performance of 500,000 rewrites at 125ºC.
As memory capacities increase, so does the demand for speed. The S-25A Series realizes a guaranteed data retention of 50 years in an operating environment of 125ºC - the best endurance in the industry.
The expansion of the ECU has meant that automotive applications use many EEPROM devices. However, to respond to recent demands for environmental soundness, low fuel consumption and fault data recording, automotive EEPROMs are now required to have larger capacities and deliver high-speed communication. The S-25A Series is a serial automotive EEPROM that operates at 125ºC and features a write time of 4 ms max.- the shortest in the industry. (The write time in previous SII models as well as competitor models is 5 ms to 10 ms.)
This series also includes a page write function, enabling write data to be temporarily stored in a page latch before being batch-written to the memory cells. This means that 32 bytes of data (page size) can be written in a maximum of 4 ms, which is 32 times faster than the write time of the S-93C66B.
In automotive applications, the EEPROM is used in a severe environment, such as with a fluctuating power supply or large applications of noise.
●Low voltage detection circuit
The S-25A Series incorporates a low voltage detection circuit (LVDET), which is used to detect a change in the power supply, an unstable voltage, or some other phenomenon that may cause a malfunction. LVDET constantly monitors the power supply and inhibits writing when a low voltage is detected.
●Erroneous write instruction cancellation function
CPM ：Clock Pulse Monitor
It is possible to cancel error command by detecting interrupt during command input such as noise pulse by cancel due to error recognition and reset by microcomputer.
●Schmitt input
The Schmitt trigger function embedded in the input circuit prevents a malfunction occurring due to unstable noise when the logic is inverted.
- For the 1 K-bit, 2 K-bit, and 4 K-bit products, click the product overview of S-25A010A/020A/040A.
- For the 8 K-bit, 16 K-bit, and 32 K-bit products, click the product overview of S-25A080A/160A/320A.
- Contact an SII sales office for details of the 64 K-bit products.