ISPLSI 5256VA-70LQ208

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ISPLSI 5256VA-70LQ208 application field and working principle

The ISPLSI 5256VA-70LQ208 is a complex programmable logic device (CPLD) manufactured by Intel. It is built with two independent low-power embedded SPLDs to provide reprogrammable embedded system functions. It has a maximum number of user gates of 256 and a maximum user primary input pins of 208.

Application Field

The ISPLSI 5256VA-70LQ208 is designed for low-power embedded applications in the industrial, automotive, communications, consumer, and other markets. It enables engineers to perform various system tasks, such as power sequencing, built-in self-test, system monitoring and control, and communication interface control, using minimal logic. It also has the capability of being used as a memory interface for nonvolatile memory applications.

Features

The ISPLSI 5256VA-70LQ208 integrates two independent low-power SPLDs with 256 user gates, 208 user primary inputs, and up to 32 LVTTL global control pins. It also includes a maximum of 1024 bytes of user-programmable EPROM memory. The device also features two on-chip power-on reset circuits with multiple user-programmable compare values, along with three oscillator circuits with separately programmable configure, start, and hold times.

Working Principle

The logic elements of the ISPLSI 5256VA-70LQ208 CPLD are organized into logic levels, with each level comprising four 4-input logic blocks. At the highest level, the user configures the inputs of the device according to the desired functionality using the on-chip EPLD. The EPLD is also used to configure the power-on reset and oscillator circuits.

When the device receives an input signal, it is routed through the logic blocks to a user logic device. Depending on the logic configuration of the device, the output of the logic device will be either a logic high or a logic low, which is then sent to the output pin of the device. The CPLD also features 512 bytes of static RAM and 32 user-configurable control registers to control its output signals.

Conclusion

The ISPLSI 5256VA-70LQ208 CPLD is a powerful, low-power programmable logic device. Its combination of SPLDs and EPROM memory enables it to be used as a memory interface for nonvolatile memory applications, while its oscillator and power-on reset circuits provide engineers with high-level control. The device also features a logic level structure that allows users to easily configure the logic levels according to the desired function.

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