SN74AS169ADE4

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SN74AS169ADE4 is an advanced four-bit synchronous presettable binary counter with a negative-edge triggered synchronous reset. It is commonly used for applications including low-cost, low-power analog-to-digital conversion, general-purpose counting, and high-speed sequential data acquisition. As a presettable binary counter that is synchronous to the clock, the SN74AS169ADE4 can be used to generate a wide variety of application specific tachymetric functions.

The SN74AS169ADE4 is limited to 4-bit operations which results in 16 states in the counter. The 16-state capability allows it to be used as a general-purpose counter perfect for applications that require higher resolution counting than a standard 4-bit counter. Additionally, it can be used as a frequency divider since its 16-state capability allows it to divide large frequency sources into smaller pieces. Such applications include automatic test equipment, frequency synthesizers, and arbitrated loop systems.

The SN74AS169ADE4 is an advanced binary counter that allows for easier implementation of sophisticated logic functions. It has an active low synchronous reset for quick resetting of the counter and allows for both asynchronous and synchronous counting. Additionally, the device also has an asynchronous preset feature to allow for reducing setup time as well as for faster response times. The outputs are in true binary format which simplifies design and reduces cost.

The SN74AS169ADE4 uses CMOS technology and is fabricated with a double-polysilicon gate process. It is characterized for operation from 0°C to 70°C and features high noise immunity with a CMOS noise margin of 2V. The device has multiple power supply pins to allow for greater flexibility in power supply design and reduced power usage. The inputs of the device are TTL/DTL compatible and with low-level output drive, they offer high noise immunity.

The working principle of the SN74AS169ADE4 is as follows: The dual, toggle-type clock input is introduced and directed to the clock inputs of each stage. This, in conjunction with the active-low synchronous reset and the active-low asynchronous preset signal, controls the counting process. Each stage of the counter is individually clocked by the shared signal and is thereby connected in synchrony. In addition, a count enable signal is generated from the output of the fourth stage of the counter.

At the instant of a negative clock transition, the counter will move to its next state if the input is enabled and the count enable signal is present. When the active-low preset/reset signal is asserted, the outputs set to the logic level. This logic level can be changed depending on the logic level of the active-low synchronous reset or the active-low asynchronous preset signal. The counter will then begin counting once the preset/reset signal is no longer asserted.

The SN74AS169ADE4 counter is an advanced synchronous presettable binary counter that provides flexibility and versatile functions for a wide range of applications. Its unique design allows for simple implementation of high frequency counting, frequency division, and other applications requiring larger binary resolution than the typical 4-bit counter. The device is suitable for low-power and low-cost analog-to-digital conversion, general-purpose counting and high-speed data acquisition.

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