SN74AHC573DWRE4

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The SN74AHC573DWRE4 incorporates a latch circuit for the storage and transfer of the logic level present at its input. Designed for single supply operation, the device has increased tolerance to noise, reduced power dissipation due to low active output, and is suitable for use in high speed logic systems. Its main application field is in the digital logic and computer sciences.

As a fair-sized IC, the SN74AHC573DWRE4 comprises of a latch circuit consisting of four n-type field effect transistors (NFETs) and eleven active components. On the top surface of the package there are two pins to supply the power and three input pins to the latch, which use TTL level logic.

These input pins are the Clock (CLK) pin, the Data (D) pin and the Output Enable (OE) pin. The clock is responsible for the timing of the latch circuit and the data is used to define the state of the latch. The output enable is a direct control of the active-low output signal.

When using the SN74AHC573DWRE4 in a latch circuit, the operation is initiated by a short negative pulse presented to the clock (CLK) input. This starts a logic transition within the latch, allowing the state of the data (D) input to be clocked onto the outputs (Q and Q̅-bar). When the logic transition has finished, the latch is said to be set.

In its idle state, when not placed in a latch circuit, the SN74AHC573DWRE4 will exhibit the static characteristics. It has two static characteristics - two input characteristic and two output characteristics - that should be considered when designing a circuit which uses the chip. The two input characteristics are the low to high transition input voltage and the high to low transition input voltage. The two output characteristics are the low to high transition output voltage and the high to low transition output voltage.

When entering the active state, the SN74AHC573DWRE4 is capable of giving an output within the specified transition times, even when the supply voltage has been reduced to 5V. Under the rated supply voltage of 5V at 25°C, the maximum transition times are typically 35ns on the high to low transition times, and 25ns on the low to high transition times. The device also has a fast turn-off time of around 10ns.

The above factors contribute to the SN74AHC573DWRE4 being a reliable device which can be used in a wide variety of logical applications. In addition, it is suitable for use in data acquisition, digital signal processing, microcontroller interfacing and electronic instrumentation.

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