CY7C144AV-25AC

The CY7C144AV-25AC is a high-performance memory device, which combines both a 4-kilobyte SRAM and a 2-kilobyte ROM into a single CMOS integrated circuit. It provides a cost-effective, low-power solution for applications requiring both RAM and ROM.

Application Fields

The CY7C144AV-25AC provides a single-chip solution for static RAM and ROM requirements. It is particularly suitable for applications such as database lookups, character-oriented displays, graphics-oriented displays, and data-entry programs. It is also well-suited for applications where physical ROM space must be minimized, such as embedded controllers and interactive keyboard systems, as it features a small package size for tight board density.

Other applications include telephone switching systems, telecommunications systems, standard registers, memory modules and PC motherboards. The device also provides write protection on the ROM, allowing it to be used in applications where data integrity is paramount, such as medical and security systems.

Working Principle

The CY7C144AV-25AC combines both SRAM and ROM in a single device and utilizes a unique architecture to achieve the highest performance and lowest power consumption possible. The device has two distinct buses with independent bus cycles; one is used to access the SRAM while the other accesses the ROM. This architecture prevents contention on the two buses and allows for efficient access to both SRAM and ROM without the penalty of idle cycles.

The SRAM is organized as 32 bytes x 128 words and can be accessed eight bits at a time. The ROM is organized as 16 words x 32 bits and can be accessed sixteen bits at a time. Both the SRAM and ROM are equipped with separate chip select signals, allowing for the ability to independently access each memory device.

The CY7C144AV-25AC is designed to consume the least possible power during operation, without compromising performance. The device is equipped with a number of power saving features such as a low-power standby mode, variable clock mode, output buffers disabled in standby mode, and automatic power down in the event of a write protect violation.

The CY7C144AV-25AC is a highly versatile memory device, offering a wide range of applications in many different market segments. It provides a cost-effective and low-power solution for applications requiring both SRAM and ROM.