SN74HC393NSR

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The SN74HC393NSR is a dual 4-bit synchronous counters, dividers and prescalers, commonly used in logic circuits. It is a dual 4-bit synchronous counter with the ability to divide a given input pulse by a given number (A), with A = 4, 8, 16, 32, 64 and 128. The name “74HC393NSR” comes from the fact that it is a high-speed CMOS counter, with the ‘NSR’ acronym meaning ‘Nonsymmetrical Reset’, meaning that the reset input on each is independently selectable. The counters are connected in an up/down binary sequence, with a single carry output from one to the other.

This counter is available in a 16-pin package, which contains the four ports, which are used to control the counters: a clock input, a reset input, an up/down control input, and the counting control output. The clock input specifies when the up/down counter will run and is used to synchronize the counting. The reset input allows the counting process to be reset to the initial state, while the up/down control input is used to adjust the counter’s count direction, either from up mode, or down mode.

Internally, the SN74HC393NSR is composed of two interconnected 4-bit synchronous counters, with the first counter, A, being divided by the second counter, B. The output of counter A is used as the input for counter B, and the output of counter B is optionally divided by four additional inverters and synchronized by one or more additional latches, which can be used to modulate the counting speed or to generate a wide range of timing outputs.

The operation of the SN74HC393NSR counters can be powered by a single power supply, and its operation can be triggered by two clock signals. The maximum counting rate of these counters is 20MHz, and its propagation delay time is less than 10 ns. They also offer low quiescent current and high power-down immunity. These characteristics make the SN74HC393NSR highly suitable for applications in high-speed digital circuit designs.

Typical applications of the SN74HC393NSR include digital logic sequencing, synchronization of clocks, numerical computations, frequency dividing, encoding, decoding, and address decoding. The SN74HC393NSR can also be used for industrial applications such as process control, monitoring, in non-volatile memory applications such as Flash programming and in instrumentation applications. Additionally, the SN74HC393NSR is widely used in automotive systems due to its wide temperature range and robust design.

To conclude, the SN74HC393NSR is a dual 4-bit synchronous counter which can be used in many applications. It is widely used in logic circuits, providing high-speed and robust performance in a small form factor. With its low power requirements and wide temperature range, it is a widely used counter in automotive systems, together with its applications in digital logic sequencing, synchronization of clocks, frequency dividing, encoding, decoding, and address decoding. Overall, the SN74HC393NSR is an ideal choice for engineers looking for a reliable and low power counter in multiple application fields.

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