AT49LV001-90TI

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The AT49LV001-90TI is a 1-Mbit electrically-erasable programmable read only memory (EEPROM), also known as flash memory, with built-in erase, program and verification functions. it is designed to provide quick, efficient non-volatile storage or code protection of system parameter settings and the configuration and program code.

The AT49LV001-90TI is a non-volatile memory that retains data and program code even when power is removed. It has the advantage of being faster than glass-epoxy PROMs, more secure than UV-erasable PROMs and more convenient than battery-backed RAMs for storage and program code protection. In addition, it can be reprogrammed in-system, e.g. on the application board, without special equipment, making it ideal for systems that have to be modified often.

The AT49LV001-90TI is available in a 32-pin, 0.6mm-pitch plastic package and comes in a total of four power supply voltage options. It is easy to use, consumes very low power and features optically isolated program and readback from the bus.

Application Field

The memory of AT49LV001-90TI is used in many different application fields. It is mainly used in embedded systems, such as automotive control systems, industrial automation control systems, medical device control systems, instrumentation applications, etc. owing to its low power consumption, fast readout and wide temperature specification.

For automotive applications, it can be used in engine management systems, in-vehicle body system control and safety systems. It can also be used in other electronic systems, like GPS navigators, intelligent wireless communication systems, e-books, set-top boxes, etc.

Working Principle

The AT49LV001-90TI has an in-system programmable, mask-programmable, single-chip PROM solution that combines 4Mbits of flash memory with an enhanced BPROM security system. The basic building block of PROM is the cell, which typically consists of a bipolar transistor and additional circuitry to detect the state of the charge on the gate of the transistor.

The erase and write operations of this device take place in the floating-gate transistors. To erase data, electrons are transferred to the floating gates under the action of high-intensity ultraviolet radiation. To write data, electrons are injected into the floating gates by hot electron injection.

Because the cells used in this memory are designed with a protected gate oxide, the charge retention of cells is long and radiation resistance is high. In addition, the AT49LV001-90TI incorporates two protective systems — a power-off protection circuit and a write-protect circuit that can be specified by a single external voltage or NVSRAM.

The memory also features an extended temperature range from -40°C to125°C, making it well suited for industrial and automotive applications.

Conclusion

The AT49LV001-90TI is a 1-Mbit electrically-erasable programmable read-only memory (EEPROM) which is easy to use, consumes low power and features optically isolated program and readback from the bus. It provides quick, efficient non-volatile storage or code protection of system parameter settings and the configuration and program code. It is mainly used in embedded systems such as automotive control systems, instrumentation, medical device control systems, industrial automation control systems, etc. owing to its low power consumption, fast readout and wide temperature specification.

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