NC7SP157L6X

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NC7SP157L6X application field and working principle

The NC7SP157L6X (or the NC7SP157) is a logic signal switch, multiplexer, and decoder manufactured and offered by Fairchild Semiconductor. The device has a very low static power dissipation, making it suitable for portable and battery-powered applications since it won’t put a strain on the battery’s life span. Furthermore, the device features low signal-to-noise ratio since the on-state resistance is very low at just a few milliohms and works over a wide temperature range of -40 to 125℃.

Application Field and Features of NC7SP157L6X

The primary application for the NC7SP157L6X is to switch or choose the source or destination of the signal from various inputs or outputs, respectively, and display them on the output port. This makes it ideal for processor and memory control multiplexing, address selection, and data path switching. The device comes in a variety of packages, including TSSOP-8, SOIC-8, and the extended temperature version, NC7SP157LR6X, in TSSOP-8 and SOIC-8 packages.

The main features of NC7SP157L6X are as follows:

• Low static power dissipation, 0.9mW
• Low signal-to-noise ratio
• Low on-state resistance, < 2 mΩ
• Four independent 8-bit data inputs
• Two D-type latches for separate inputs with two clock signals
• Outputs have three states, high, low, and Hi-Z
• Wide temperature range of -40 to 125℃
• Available in TSSOP-8, SOIC-8, and extended temperature version, NC7SP157LR6X

Working Principle of NC7SP157L6X

The NC7SP157L6X is built on an 8-bit configuration, allowing four independent 8-bit data inputs with two D-type latches for each input and two clock signals. The latches are used to store the first and second inputs and the clock signals control which data is output from the device.

The device operates by sensing the levels of the four data inputs and clock signals in two steps, first for the high data latch, and then for the low data latch. After that, the device determines which data is to be output based on the combinations of the four 8-bit data inputs and the two clock signals by comparing them with the contents of the two latches.

The NC7SP157L6X has three states available at its output, allowing it to be used as a select/decode line. The three states are low, high, and Hi-Z, which stands for high impedance, a state of being able to transmit only a limited amount of current.

Conclusion

The NC7SP157L6X is a useful device for selecting and decoding data signals, allowing customers to switch and choose the source and destination of the signal, respectively. It features a low static power dissipation, low signal-to-noise ratio, a wide temperature range, and comes in various packages. Achieving the desired function is done by sensing the levels of the four data inputs and clock signals and comparing them with the contents of two latches.

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