SN74HC646DW

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The SN74HC646DW is a 8-bit bus transceiver that has two active-low buffer enable (G1, G2) input control pins. It allows bidirectional data to be transferred from the A bus to the B bus or from the B bus to the A bus, each time a valid logic command is acknowledged. This transceiver is used in data transmission applications by providing logic-level conversions between TTL-compatible logic levels and CMOS/TTL-compatible logic levels. It also offers increased power output drive capability, greater noise margin, and improved thermal characteristics. The SN74HC646DW is part of the Logic - Buffers, Drivers, Receivers, Transceivers family and is designed to meet the needs of high-speed data applications.

The primary application field of the SN74HC646DW is mainly in high-performance communication systems and electronics, such as in digital signal processors, buses, communications and digital networks. It is also used for a variety of applications such as analog-to-digital and digital-to-analog converters, bit-oriented systems and packet-based systems. This transceiver can be used to transmit data from one system to another, as well as for signal conversion. Due to its 8-bit data width and its active-low buffer enable inputs, it can be used for transferring multiple data words at the same time.

The working principle of the SN74HC646DW is composed of two main parts: the dual set of transceivers and the control logic. As mentioned, the bus transceivers have two active-low buffer enable inputs that control the data transfer direction. With the G1 and G2 pins high, the A bus will be connected to the B bus, allowing the data to be transferred. When the buffer enables G1 and G2 pins are low, the data is blocked and no transmission is allowed. The control logic circuit of the SN74HC646DW is driven by the ENA and ENB pins, which have precedence over G1 and G2. When ENA is held high and ENB is low, the A bus is enabled and the B bus is disabled and vice versa when ENB is held high and ENA is low.

The SN74HC646DW also features integrated protection circuits. The device features current-limiting, overtemperature and reverse-voltage protection that ensures safe operation even in extreme conditions. Furthermore, the device has a low static power consumption making it suitable for battery powered devices. Additionally, the device can operate with a 2V to 5.5V power supply.

In summary, the SN74HC646DW is a 8-bit bus transceiver that is part of the Logic – Buffers, Drivers, Receivers, Transceivers family. It provides logic-level conversions between complement of CMOS compatible logic levels and TTL logic levels, while also featuring overtemperature, current-limiting and reverse-voltage protection. It is mainly used in high-performance communication systems, such as buses and digital networks, allowing data to be transferred from one system to another. It can be used with a 2V to 5.5V power supply and offers low static power consumption, further promoting battery-powered applications.

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