MC74AC373DW

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The MC74AC373DW is a type of latch logic circuit in the AC series from Motorola that is available in a variety of DIP, SOIC, and TSOP packages. The MC74AC373DW is a dual-edge-triggered 3-state 8-bit latch which utilizes transparent-latch, data-capture, and data-hold functions to store and output data. This type of latch is ideal for use in applications needing to store data, such as memory systems and data buses.

The MC74AC373DW latch includes two separate latch stages. Each latch stage consists of 8 data inputs (D0-D7) and 8 data outputs (Q0-Q7). The chip is enabled with two separate enable pins (LE and OE), each of which can be used to individually enable or disable latch operations and data output. When both LE and OE are disabled, all outputs are in the high-impedance or “Z” state. This allow multiple devices to be daisy-chained on data busses with little risk of contention.

The latch is powered from a single +5V power supply, with a maximum of 15 mA of current being necessary for the entire chip. This makes it ideal for use in portable devices and other battery-powered applications. The total power dissipation is 2.4 mW at 25 °C, with the junction temperature being stored at 125 °C. This ensures that the latch is able to maintain data integrity in most temperature ranges.

The latch works on the principle of transparent latch data capture. As the LE and OE pins are enabled, the data is latched onto the chip’s data inputs. During the time that the latch is enabled, the data is stored on the chip’s internal data registers. When the latch is disabled, the data is stored as it is, with no changes being made.

When the latch is enabled, the data can be stored in the chip’s internal data registers. As the OE pin is active, the stored data can then be sent out of the chip onto the 8 outputs. If the OE is disabled before the latch is enabled, then the data on the inputs is ignored and the outputs remain in the “Z” state. This allows for data to be sent through multiple chips with minimal risk of contention.

The MC74AC373DW is well-suited for use in a wide variety of applications. It is commonly used in memory systems and microprocessor systems, due to its low power consumption and high data throughput. In addition, it is often used in data buses and in peripheral controllers, such as USB and IEEE-1394 controllers. It is also used in FPGA designs, as a way to increase the number of available I/O pins.

When used in memory systems, the MC74AC373DW works as a transfer latch, allowing data to be transferred from one memory location to another. In microprocessor systems, the chip can be used to interface between the microprocessor and the external components. In data buses, the chip can be used to store data sent from other devices, and output the data in a controlled manner. Finally, in FPGA designs, the chip can be used to send and receive data between the FPGA and the external components, greatly increasing the number of available I/O pins.

In conclusion, the MC74AC373DW is a dual-edge-triggered 3-state 8-bit latch which utilizes transparent-latch, data-capture, and data-hold functions to store and output data. It is powered from a single +5V power supply and is well-suited for use in a wide variety of applications, due to its low power consumption and high data throughput. The latch works on the principle of transparent latch data capture, allowing for data to be stored and outputted in a controlled manner.

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