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Memory - 7140LA25PF Application Field and Working Principle

7140LA25PF is a semiconductor memory device from SANYO. It is an 8K-bit RAM that consists of an 8K-bit MOS integrated circuit in a 28-pin dual in-line package. This article introduces its application field and working principle.

Application Field

The 7140LA25PF is a CMOS memory device, consisting of 8K-bits of random-access memory and is designed specifically for fast access, dynamic RAM applications. It is typically used in applications including process control, data acquisition and instrumentation. Most commonly, it is utilized as a medium-sized memory block, providing a relatively large storage space with a relatively low cost.

Working Principle

The 7140LA25PF consists of two MOS transistors and two capacitors to construct a single memory cell. The MOS transistors act as switches to control the flow of charge between the capacitors. While the capacitors store the data. When the device is accessed, voltage pulses will switch on one of the MOS transistors and off the other, which will determine whether the capacitors are charging or discharging.

The 7140LA25PF is also capable of refreshing memory cells in order to retain the stored data within. This is done by continuously reading and writing data to refresh the capacitors and ensure that the capacitors do not discharge completely.

Conclusion

The 7140LA25PF is a semiconductor RAM commonly used in applications such as process control, data acquisition and instrumentation. It consists of an 8K-bit MOS integrated circuit in a 28-pin dual in-line package. This device works by controlling the flow of charge between two capacitors, which are used to store data. Moreover, the capacitors must be periodically refreshed in order to retain the stored data.

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