SN74LV245ADWR

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SN74LV245ADWR is a low voltage, octal bus transceiver that has been designed to handle data communications between TTL and MOS logic families. This device is ideal for partial driving and bus-holding applications where high data rates and optimum noise immunity is desired and is most commonly used in low voltage applications, such as personal and laptop computers, domestic appliances, and automotive systems.

The SN74LV245ADWR is an integrated circuit with two separate channels which consist of two 3-State, bidirectional buffers allowing data to be transferred from an 8-bit source to two 8-bit destinations or two 8-bit sources to a single 8-bit destination. Each channel can be independently enabled and thus can be used as an 8-bit bi-directional transceiver. The output stage of each channel is designed to reduce the effects of glitches and ringing, providing improved output noise immunity. This reduces the number of untrusted glitches on the bus which, in some cases, can cause a major system malfunction.

Additionally, the SN74LV245ADWR has the ability to provide bus hold on data outputs when the enable is inactive. Bus hold is used to ensure correct logic levels on the outputs during bus contention, when both devices on the bus may be attempting to drive the same signals. For example, when a device is powering down, or has been reset, the bus hold function will ensure that the outputs will be driven to the appropriate logic level.

The SN74LV245ADWR is well suited for a variety of applications. It is commonly used for data bus applications, such as bus contention and bus arbitration, where one device needs to arbitrate between two or more devices which are trying to access the same bus. It is also extensively used for bus multiplexing when switching between two different busses is required. In addition, the device can be used for level translating from one voltage level to another as well as bi-directional parallel port communication.

To ensure that the device is reliably used in different applications, the SN74LV245ADWR has several features which are aimed at protecting the device. It has ESD protection to protect against electrostatic discharge, over-temperature shut-down to protect the device from overheating, and the output enable feature which allows for additional protection against bus contention.

The working principle behind the SN74LV245ADWR is quite simple. The circuit consists of two independent 8-bit buffers, each with two enable inputs. When the enable input is high, the corresponding buffer will be enabled and the data held in its 8-bit registers will be output. If the enable input is low, the corresponding buffer will be disabled and the output will be in a Hi-Z state. The device can be used in either uni-directional or bi-directional mode depending on the selection of the outputs.

In uni-directional mode, one buffer will be used to drive the data on the bus while the other is used to receive data. In bi-directional mode, both buffers will be used to both drive and receive data on the bus. The device also has a bus hold feature which ensures that the output levels will be maintained when both devices on the bus are driving the same signals, such as when one device is powering down or has been reset.

In summary, the SN74LV245ADWR is an octal bus transceiver which is suitable for a variety of applications such as data bus applications, bus multiplexing, level translating, and bi-directional parallel port communication. Its unique features allow for improved noise immunity, bus hold, and ESD protection which helps to ensure reliable operation in all types of applications.

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