74VHCT245ASJ

74VHCT245ASJ Application Field and Working Principle

Classification: Logic - Buffers, Drivers, Receivers, Transceivers

The 74VHCT245ASJ is a digital circuit in the 74VHCT (very high-speed CMOS) series from Texas Instruments (TI). It is a 16-bit bidirectional transceiver with bus-hold and output enables. The inputs behave like CMOS lines. Therefore, no external pull-up resistors are required for the logic recoginition level. Outputs can be configured for different logic families. Compared to its predecessor, 74VHCT244ASJ, 74VHCT245ASJ has improved noise immunitability, improved partial power down performance, and improved waveform symmetries.

Application Field

The 74VHCT245ASJ is popular among many applications. It is often used in robotics, automotive applications, and consumer electronics. The bidirectional features of 74VHCT245ASJ makes it ideal for applications which require both direction communication, such as communication systems and data transmission. Coupled with its wide voltage range (2V to 5.5V), it can operate in a wide range of temperatures. For example, automotive applications, which are heavily influenced by the external environment such as temperature, humidity, and pressure.

Working Principle

The 74VHCT245ASJ is a 16-bit bidirectional transceiver with bus-hold and output enables. It utilizes eight BUS-INA and eight BUS-OUTB pins for data transmission. It also uses two EN pins to control the outputting data. The bus-hold feature prevents the bus from floating in its inactive state. The output enables allows control over active and inactive data flow. As the 74VHCT245ASJ has open-drain outputs, it can support both TTL and CMOS output levels without external pull-up resistors. It has a very high speed of operation which makes it suitable for video signal transmission, networking and communication applications.

Conclusion

The 74VHCT245ASJ is a robust and reliable digital circuit used in various applications. It has benefitted from the improvements of its predecessors, the 74VHCT244ASJ and 74VHCT8244ASJ. The integration of an open drain output, bus-hold and output enables features makes it suitable for applications where bidirectional communication is required. Furthermore, it is also capable of operating at wide temperature range and voltage, which makes it suitable for use in automotive applications as well.