SN74ACT373N

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Latches are electrical components used to store data. They have a variety of applications including sequencing, synchronizing, and memory holding operations in integrated circuit logic. In particular, the SN74ACT373N is a latch integrated circuit (IC) used in digital electronic devices. This article explains the application fields and working principles of SN74ACT373N.

Application Field

The SN74ACT373N is a 3-state latch that can store logic level signals. It is typically used in data and address buses for multiplexing. The inputs and outputs are designed for logic level signals up to 3.6V and can be driven with as low as 0.4V. An open drain output also allows for higher voltages. The SN74ACT373N is therefore used in many types of digital devices and computer technologies such as microcontrollers, data processing systems, buses, memory, and I/O controllers.

Working Principle

The SN74ACT373N is a latch IC that comprises two 4-bit latches, each with a separate data input, one data output and two associated control inputs. They operate based on the ‘high’ and ‘low’ logic levels supplied to the control inputs. The data inputs and outputs are digital, with binary 1 and 0 levels.

When both control inputs are set to ‘low’ logic level, the SN74ACT373N latches data. That is, the data applied to the input is stored in the IC until the control inputs are again set to ‘high’. The stored data is provided at the output when the control inputs are set to ‘high’. In order to avoid inadvertently rewriting and reading from the latches, certain rules are followed - the enable pin is asserted first and then the data is loaded followed by the reset pin.

The 3-state feature of the SN74ACT373N can be used for data or address bus multiplexing. When both control inputs are at a high logic level, the outputs are in the three-state, i.e. their outputs are ‘high impedance’. The connection is effectively ‘floating’ – it can be pulled up or down by an external circuitry.

Because of its versatility, the SN74ACT373N is used in a variety of applications. It allows data to be stored and shared between digital circuits, making it valuable for memory and I/O operations. The three-state output is especially useful for multiplexing, allowing for efficient sharing and operation of buses or signals.

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