SN74AVC4T245PW

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Logic translators and level shifters are essential when it comes to connecting logic based components across multiple power supply rails, with TXB0104, being one of the most popular of these level shifters. The SN74AVC4T245PW is the latest evolution from the TXB0104, providing many of the same features and functions, with a few key differences. In this article, we\'ll discuss the main application field and working principle of the SN74AVC4T245PW.

Application Field

The SN74AVC4T245PW is a 4-bit bidirectional voltage-level translator designed for asynchronous bidirectional data transfer between devices operating at various supply voltages. It is designed for applications such as SDRAM, DDR, and DDR2 memory, I2C, SPI, and UART serial connectivity, and low-speed asynchronous host applications. It is also suitable for applications in other areas such as the medical, automotive, industrial, and consumer markets.

The SN74AVC4T245PW supports an input voltage range of 1.65V to 5.5V, and a translation voltage range of 1.2V to 3.6V. This allows it to be used to interface between components running on different voltage supplies, such as 1.8V and 3.3V.

Working Principle

The SN74AVC4T245PW uses a dual CMOS voltage-level shifter to provide logic-level translation from one voltage to the other. It consists of four independent 1-bit bidirectional buffers that use two CMOS input pins (A and B) to select the transfer direction. Data bits are latched into the device on the rising edge of an input clock and then output on the following rising edge.

The four bidirectional shifting channels of the SN74AVC4T245PW can be direction-controlled by the A and B inputs. When A and B are both low, all four channels shift in the same direction. When A is high and B is low, the even channels shift from the high voltage to the lower voltage, and the odd channels shift from the lower voltage to the higher voltage. And when A is low and B is high, the even channels shift from the low voltage to the higher voltage, and the odd channels shift from the higher voltage to the lower voltage.

The SN74AVC4T245PW also features protection measures against harmful input transients such as ESD and latchup protection, and an adjustable rise and fall output duty cycle to reduce EMI interference. The device also has over-voltage clamping, slew rate control, and soft start capability.

Conclusion

The SN74AVC4T245PW is a versatile level shifter capable of transferring data between devices with different power supplies. Its bidirectional shifter provides logic-level translation, while its protection measures provide additional functionality and reliability. The device is suitable for a wide range of applications, from memory to serial connectivity, and is perfect for bridging the gap between components running at different voltages.

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