SN74LVT18512DGGR

Series:	74LVT
Packaging:	Tape & Reel (TR)
Part Status:	Active
Logic Type:	Scan Test Universal Bus Transceiver
Number of Circuits:	18-Bit
Current - Output High, Low:	32mA, 64mA
Voltage - Supply:	2.7 V ~ 3.6 V
Operating Temperature:	-40°C ~ 85°C
Mounting Type:	Surface Mount
Package / Case:	64-TFSOP (0.240", 6.10mm Width)
Supplier Device Package:	64-TSSOP
Base Part Number:	74LVT18512

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Logic - Universal Bus Functions

The SN74LVT18512DGGR (hereafter referred to as the SN74) is a 1Gbps transceiver for general parallel and serial applications. The SN74 offers some unique advantages for certain applications and is highly compatible with the standard logic families. This paper will discuss the application fields and the working principles of the SN74.The SN74 is capable of two types of communication: single-ended and differential. In single-ended mode, the transceiver can be used to interface between two buses that use the same voltage levels. In differential mode, the transceiver can use two different voltage levels to provide high speed and noise immunity. Both modes support communication between different logic families.The SN74 can operate with three different protocols: point-to-point, daisy chain and time division multiplexing (TDM). Point-to-point communication allows for direct connection between two or more buses without needing to go through a bus switch or constraint network. This approach is typically used in low speed applications with larger buses, such as Ethernet.In daisy chain mode, the transceiver can be connected to multiple other transceivers, creating a chain of buses. This offers the advantage of connecting multiple devices with very little wiring, which is beneficial in space constrained applications. Lastly, TDM mode allows for data to be shared between two or more buses while maintaining synchronization and timing. This mode is typically used in high speed and low latency applications, such as streaming video.In addition to its communication modes, the SN74 also offers other features that make it suitable for various application fields. It has high tolerance for power supply and temperature fluctuations and can operate reliably at -40°C to +85°C temperatures without any derating of performance. It also has a built-in ESD and electrostatic discharge protection, making it suitable for use in industrial and automotive environments.The SN74’s working principle is based on a number of transistors and diodes that are connected in pairs in a linear configuration. The transceiver contains three basic components: an input buffer, an output driver, and a logic gate. When the input driver is activated, it transfers the low logic level signal received from the outside to the logic gate. The logic gate then interprets the signal and decides whether it is valid or not. This information is then passed to the output driver, where it is converted into the appropriate voltage level and passed out of the transceiver.In this way, the SN74 is able to communicate bidirectionally between two buses. It also has output and input selection inputs, which allow it to support communication between different logic families.Overall, the SN74 is a highly versatile transceiver capable of providing reliable communication between two or more buses. Its protocol support, temperature robustness and signal protection features make it suitable for a range of application fields, from automotive and industrial to streaming video and communications.

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