SN74LS669D

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The SN74LS669D is a monolithic bipolar counter and divider integrate circuit designed for 16-bit asynchronous binary applications. It contains two independent divide-by-n counters, each with an internal output latch. The SN74LS669D counters are ideal for counting events such as pulses, temperature changes and so forth. The counters offer a wide variety of features, including easy setup, low current drain and low cost.

The SN74LS669D is divided into four independent functional blocks: two 16-bit divide-by-16 counters, the output latch and a control block. The two 16-bit divide-by-16 counters have an asynchronous reset input and an asynchronous down-count input. The SN74LS669D counters are clocked by an external clock signal. This external clock signal determines the frequency at which the counters count up or down. When the input is logic low (LOW) the counter will count down by one. When the input is logic high (HIGH) the counter will count up by one.

The SN74LS669D output latch is an optional block that holds the output of the counters. The output latch is triggered by an asynchronous programmable counter reset signal. The output latch can also be used to hold a different value when the counter is reset. This allows the SN74LS669D counter to be used for more complex applications such as frequency measurement.

The control block of the SN74LS669D provides a wide range of programmable features. These features can be used to configure the SN74LS669D counters to different modes of operation. These programmable features include counter reset and counter reset pulsewidth, counter override and counter status registers, analog reset and digital reset, synchronized reset and asynchronous reset,etc.

The SN74LS669D is a versatile counter/divider integrated circuit for 16-bit asynchronous binary applications. Its low cost, low current drain, and easy setup makes it a great choice for applications such as pulse counting, temperature monitoring and so forth. The programmable features of the SN74LS669D control block allows for a variety of different modes of operation, and the the output latch can be used to store the last count or a different value when the counter is reset.

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