SN74LV245APWRE4

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SN74LV245APWRE4 is a bi-directional, octal non-inverting bus transceiver with 3 state outputs for bi-directional level-shifting and bus-oriented applications. This transceiver has active output clamping and responds to input-level control for enabling/disabling the outputs for bus management and power supply conservation functions. This transceiver can be used in a variety of logic-level translation applications and low-voltage digital logic applications.

The SN74LV245APWRE4 can be classified trivially under the general category of logic - buffers, drivers, receivers, transceivers. It is a combination of all these terms, belonging to the same category but with certain specific characteristics.

The application field of the SN74LV245APWRE4 can broadly be defined as any low-voltage digital logic applications such as level shifting between different voltage nodes in TTL or CMOS, or in data transmission when both logic families are used together. It is also suitable for passing low-speed data between logic families, from a low power source to a higher powered environment, and also in applications where systems were updated with 13-V TTL logic components and 5-V systems were to be kept compatible.

The working principle of the SN74LV245APWRE4 is based on the concept of bi-directional level-shifting, where current controlled switches are used to interface the two devices having different input-logic levels. The device is used in live systems that require power conservation facility, so a low power enable/disable pin is used to control the Outputs. By using this pin, the outputs can be kept disabled in order to conserve the power as well as in order to reduce EMI and RF noise causing glitches.

The SN74LV245APWRE4 uses push-pull output drivers to eliminate the need for external pullups and assuring compatibility with any system needing 15kOhm pullups. It features exceptionally low ON resistance and is designed to handle data rates up to 50 MHz). Moreover, its active output clamping feature prevents the output from floating in a non-definable state.

The SN74LV245APWRE4 also uses special input design with HYSTERESIS that provides improved noise margin in the presence of slow transistions, and prevent thrashing in the digital inputs. To control the output enable and disable, it also has enable and disable inputs with a wide Vcc on voltage range.

In conclusion, the SN74LV245APWRE4 is a very versatile, low noise and low power transceiver. It can be used in a wide variety of logic-level translation applications and low-voltage digital logic applications, allowing level shifting between different voltage nodes in TTL and CMOS, transmitting low speed data between incompatible communication lines, and providing power conservation facility in a fast and efficient manner. Despite the fact that this transceiver belongs to the same general category as other similar transceivers, its wide array features, special inputs, and output clamping give it a competitive edge.

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