74LCXZ2245MSA

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The 74LCXZ2245MSA is a logic-level buffer / transistor-transistor logic (TTL) level shifter / FET bi-directional translator from Texas Instruments. It is part of their Low Voltage Logic family, a range of standard-architecture products for low-power, low-capacitance, low-voltage digital logic applications. This device allows for high speed and low power consumption, making it ideal for modern systems that require a fast, low-power solution.

Application Field

The 74LCXZ2245MSA is a general-purpose bi-directional translator/buffer and can be used in applications with very little placement considerations and where high speed and low power are the main objectives. Its low power operation makes the device suitable for portable, handheld, battery-powered products, such as cell phones, tablets, and other mobile devices.

Whatever is driving the 74LCXZ2245MSA’s inputs, a logic low input (0V) on either side of the device will generate a logic low output (0V) on the other side. While another side of the device will produce a logic high output (3.3V or 5V, depending on the supply voltage). Therefore, it performs various logic translation functions such as SN74LS TTL to SN74LVC, two-level logic translation, or transitioning from different logic families. This translation can be used in a switching application to switch a device from one logic-level to another or just to buffer a signal from one logic level to another.

Working Principle

The 74LCXZ2245MSA can operate in either direction without any changes and can be used in either direction to convert a single logic input voltage level to another logic voltage level. It will pull up the output high or pull it down low when enabled by an input. The output voltage level and response time are independent of the source logic family.

Whenever the input receives 0V, the output automatically sets to 3.3V and vice versa. The 74LCXZ2245MSA includes a high-speed driver internal circuit which helps reduce the propagation delay while decreasing switching power dissipation. Since the device only operates in either a high or low voltage level, the device can be directly connected to pull-up resistors or to the outputs of other logic sets.

Moreover, an input Hysteresis is offered to enhance noise margin and propagation delay in ESD sensitive circuits. An internal circuit bypasses the logic input when in static logic levels allowing the logic paths to remain enabled while reducing static current bias.

The 74LCXZ2245MSA is also deselected, which prevents unwanted switching of signals by ensuring that both inputs must simultaneously coincide in order for the device to output a valid high or low signal. Furthermore, the hybrid ESD protection feature of this device also provides protection against ESD events.

Conclusion

The 74LCXZ2245MSA is a bi-directional translator/buffer, making an ideal choice for TTL-to-TTL and two-level logic switching. It offers low power consumption and ultra-fast operation, making it suitable for use in battery-powered devices, such as cell phones, tablets, and other mobile devices. A number of logic family protocol translations and hybrid ESD protection can also be achieved using this device. Therefore, the 74LCXZ2245MSA is a great choice for modern systems that require a fast and low-power solution.

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