SN74AVC4T245PWG4

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The SN74AVC4T245PWG4 is a quadruple bi-directional transceiver logic device with integrated bus hold circuit with +3.3V Vcc single power supply. It is a member of the Texas Instruments’ AVC family of Logic Translators, Level Shifters and Voltage Level Translators. The SN74AVC4T245PWG4 is designed to provide logic-level translation between high speed 2.5V VccA and +3.3V VccB TTL logic family devices.

The SN74AVC4T245PWG4 device is well-suited for applications where there is a need to interface two different voltage-level logic families such as 3.3V and 5V. It achieves increases in system design productivity and performance when used in applications that require port expanders, address drivers, data multiplexers and demultiplexers, line drivers, and other logic level translator functions.

The SN74AVC4T245PWG4 employs a unique pin-out with the four channels (A, B, C and D) overlapping each other to minimize signal routing, allowing for lower power dissipation in applications where signal trace lengths are short. For easy visual pin-out identification, the signal function names of the four channels are printed on the top side of this device.

The SN74AVC4T245PWG4 provides 4-channel bi-directional level conversion from the 2.5V VccA TTLA to the +3.3V VccB TTLB or vice versa. An on-chip bus-hold circuit provides data input signal hold support for the bidirectional channels with the hold device featuring an independent enable pin. The SN74AVC4T245PWG4 device features ESD (electro-static discharge) protection, making it suitable for portable applications and other situations subject to ESD.

The working principle of the SN74AVC4T245PWG4 is quite simple. The Bi-directional Transceiver Logic functions of the device are enabled by the output enable lines (OE1 and OE2). When OE1 is low, it connects Channel A to Channel B, and when OE2 is low, it connects Channel C to Channel D. As such, when both OE1 and OE2 are low, the SN74AVC4T245PWG4 creates a bidirectional connection between channels A, B, C and D. Furthermore, data inputs (DI1 and DI2) select the direction of the bi-directional transceiver. When DI1 = LOW and DI2 = HIGH, data enters on the A/C side and flows out of the B/D side, and vice versa when DI1 = HIGH and DI2 = LOW.

The SN74AVC4T245PWG4 device provides a wide range of applications, from low to medium-speed logic level translation. It can be used in various applications such as data buses and address multiplexers, microprocessor memory interfaces, port expanders and line drivers, and for multiple system voltage level conversions. It can also be used for applications where size and power dissipation are a concern.

The SN74AVC4T245PWG4 from Texas Instruments is an advanced Logic Translators, Level Shifters and Voltage Level Translators device that is well-suited for applications where there is a need to interface two different voltage-level logic families. With the ESD (electro-static discharge) protection, the device can be used in portable applications and other situations that are subject to ESD. With its advanced functions and features, it is an ideal choice for applications that require port expanders, address drivers, data multiplexers and demultiplexers, line drivers, and other logic level translator functions.

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