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Logic - Gates and Inverters

The TC7W08FKTE85LF is a two-input non-inverting CMOS gate IC designed for a wide variety of logic operations in digital application fields. It is a robust digital logic device that informs the user of a logical decision based on the input digital signal states given. The device is a combination of two devices – the logic gate and the inverter, spending less of the users’ board space and power since it combines them into one IC.

Application Field

The wide range of operations makes the TC7W08FKTE85LF suitable for any digital application field which requires basic logic functions. This chip can be used in families of automotive, digital clock, robot control or any other digital systems. Depending on the operator, the TC7W08FKTE85LF can be used in both combination and sequential logic.

Working Principle

The TC7W08FKTE85LF has two inputs (A/B) and one output (C). An inverter is connected to the output. The logic level at the output (C) depends on the logic levels at A and B. The gate is constituted by N-channel and P-channel MOSFETs. When the input gate is at high logic level (H or VCC), the wide conducting N-channel MOSFET turns on and the P-channel MOSFET turns off. When the input gate is low (L or GND), the wide P-channel MOSFET turns on and the N-channel MOSFET turns off. This is the reason why this type of gates in called “open drain”. The output C is driven at the same logic level that A and B, with the addition of two types of pull-up resistors. This can be seen in the truth table of the chip.

Truth Table

The internal block diagram of the chip is made up of two inverters (I1 and I2) and two N-channel MOSFETs (M1 and M2). The supply voltage (VCC) is the main source of power, and the output voltage is determined by the input signal (H or L). When both inputs are at high logic level (H), the N-channel MOSFET (M1) is wide open and the P-channel (M2) is off, allowing current flow to pass through the chip and the output is driven at high logic level (H). When one of the inputs is at low logic level (L), the P-channel MOSFET (M2) turns on and N-channel (M1) turns off, preventing current flow and the output is driven at low logic level (L).

The TC7W08FKTE85LF features the ability to use split power supply, meaning that apart from VCC and GND, two pins can be connected to higher and lower supply voltages. This makes the chip more versatile and can be updated when VCC is unavailable. Furthermore, the chip can be used in both CMOS and TTL voltage levels, making it suitable for most of the digital system designs.

Conclusion

The TC7W08FKTE85LF is a robust logic gate with inverter IC, suitable for a wide range of digital operations in different application fields. Its design allows for split power supply, CMOS and TTL voltage levels and can be used in both combination and sequential logic. Its input and output signals have been tested at a wide range of voltages, and the chip is guaranteed to perform properly up to a temperature range of -40 to 125 C. Considering all these features, the TC7W08FKTE85LF is an advanced, user-friendly and reliable chip for digital operations.

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