SN75140PSR

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The SN75140PSR is an integrated circuit developed by Texas Instruments and is part of TI\'s TTL logic family. This chip is a quad open-collector line driver; four independent channels are included and the circuit is designed specifically to drive high-capacitive loads such as data cables. Used to interface logic signals between devices such as computers, it can be used to drive loads of up to 25V at up to 50mA.

Application Field

The SN75140PSR is typically used to interface between systems with different logic levels because of the open-collector outputs. Examples of interface applications include between computers on a network and between microcontrollers, such as those used in circuit design. It is also used to drive and receive data from various data buses.

Working Principle

The SN75140PSR consists of four independent line drivers, each of which has an input and two outputs. The two outputs are connected to an open collector; the open-collector output allows either the input voltage or ground to be connected to the output. The inputs are TTL compatible and support logic levels of 0V to logic 1V (typically 5V).

The outputs are designed to drive up to 25V and can deliver up to 50mA of current. This makes them suitable for driving large capacitive loads, such as data cables. The outputs are also designed with a low impedance, allowing them to be driven with relatively low voltage swings. A Schmitt Trigger input ensures that any input signals with noise or spikes are filtered out and that only valid logic-level signals are allowed.

The SN75140PSR also includes internal protection features. Each output includes diodes which protect both input and output from transient spikes. Additionally, an internal thermal protection circuit protects the chip from overheating if it is subjected to excessive load currents.

In summary, the SN75140PSR is a quad open-collector line driver designed to interface between systems with different logic levels. It can be used to drive up to 25V at up to 50mA and has protection against transient spikes and overheating. It is widely used in many interface applications and can be found in many devices, from computers and microcontrollers to data buses.

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