SN74ALS561ADWE4

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The SN74ALS561ADWE4 is a general purpose and high-performance synchronous 4-bit binary up and down counter. Specifically, this integrated circuit offers two asynchronous independent up/down count sources: start/stop push button and a pulse on the input pin. It also includes a common RESET pin for both the counting modules. All of these count sources can be connected directly to the inputs of the device without any additional components. Furthermore, the product is capable of directly performing up/down counting applications without needing other logic components.

The SN74ALS561ADWE4 is ideally suited for a variety of applications including digital frequency synthesizers, digital delay lines, frequency dividers, and address decoding. The device employs bipolar CMOS (BiCMOS), a high-speed logic process that combines bipolar transistor advantages such as high-speed digital logic and the CMOS technologies low power consumption. This makes it well-suited for high- and medium-speed logic applications such as those involving microcontrollers.

The SN74ALS561ADWE4 is designed with a synchronous, low-power 4-bit up/down counter. It allows both up and down incrementing and decrementing of its binary count from 0000 to 1111 and functionality can easily be modified by allowing the START/STOP input to be used to suspend and/or restart the count. Counting starts with a positive or negative voltage pulse or with a start/stop button. Its minimum operating voltage is 4.5V, and a standby current of less than 5mA is required for the entire device.

The SN74ALS561ADWE4 is based on a 4-bit synchronous counter with an internal synchronous full-adder tree and four internal process-assisted flip-flops. Each flip-flop is designed to act as both a master flip-flop and a slave flip-flop, allowing for both up and down counting. The internal synchronous full-adder tree is composed of two levels of cascaded logic blocks and is used to enable up and down counting.

The SN74ALS561ADWE4 counters include an internal enable logic section which is used to enable and disable the counter, an enable synchronous reset which is used to reset the counter, and a toggle (T) logic section which is used to cause the flip-flop outputs to be inverted when the count reaches certain values.

The SN74ALS561ADWE4 also includes a master sync reset and disable control output. The master sync reset is used to synchronously reset the counter, while the disable control output is used to disable the counter. The device\'s power-down mode effectively reduces the current consumption to 0. Additionally, the device includes four active-low count enable inputs that can be used to latch the counter to certain values.

The SN74ALS561ADWE4 is well-suited for digital frequency synthesizers, digital delay lines, frequency dividers and address decoders. Its BiCMOS technology combines the best of both bipolar and CMOS transistors which makes it ideal for various applications. Additionally, its low power consumption, wide operating voltage range and low standby current make it suitable for battery-powered applications as well as for high-speed and medium-speed logic applications.

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