SN74LV161ANSR

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The SN74LV161A is a high-speed asynchronous 4-bit binary counter. It is part of a family of devices developed for applications such as counters, dividers, rate multiplying and frequency dividing circuits. The device features an asynchronous clear (active high) and synchronous preset inputs for easy programming. The SN74LV161A is designed for use in fast, wide timing applications from 5 to 20 MHz. The high speed and low power dissipation make it ideal for portable applications such as powering a motor or controller.

The SN74LV161A is a synchronous 4-bit binary counter with an asynchronous clear (active high) and synchronous preset inputs. The device combines these features with a wide range of operating frequencies, making it suitable for applications such as frequency synthesis, frequency division, and rate multiplication. The counter can be incremented or preset in one of two ways: by either a negative logarithmic or a linear clock pulse. The SN74LV161A is designed to allow for the processing of data in a maximum output frequency of 20 MHz.

The device contains four 4-bit counter stages connected in an asynchronous ripple-carry connection. Each of these counters has its own logic circuit, providing an output that increments with each count of the counter. The SN74LV161A also includes an asynchronous clear input as well as a synchronous preset input. Additionally, it contains a LOW count-enable input that freezes the counter at the present count when activated.This feature simplifies hardware input control.

The SN74LV161A ’s asynchronous clear input, active high, immediately sets all flip-flops of the counter to the preset state. This input has priority over all other counter operations. This input is also isolated from the clock pulses, providing a double effect. It supplies the initial carry pulses necessary to start the counters, and it also preserves the state of the counter if the clock stops or becomes erratic.

The SN74LV161A is designed for use in numerous logic and timing applications. For example, it can be used to produce repeatable frequency divisions, rate multiplexing, voltage-controlled frequency dividers, and ripple-carry frequency dividers, for applications such as motor control, robotics, and control systems. It can be used as a substitute for a multi-stage counter, as a programmable counter, as a timer to count time periods, and as a digital decoder. It is also commonly used to intercept and decode digital signals, as well as in frequency divider applications.

In summary, the SN74LV161A is a high speed, low power dissipation asynchronous 4-bit binary counter. It provides both asynchronous clear and synchronous preset inputs, programmed via the LOW count-enable input, and can operate in a wide range of frequencies up to 20 MHz. It is well suited for applications such as counters, dividers, rate multipliers, and frequency dividers, due to its features and performance capabilities.

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