CD74HC190NSR

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The CD74HC190NSR is an integrated circuit that can be used for counting and dividing operations. It is a high-speed, low-power CMOS 8-bit up/down ripple counter with inputs for carry-in, carry-clear, reset and divide-by-four enable. The counting sequence is reversible, and terminates at zero or one depending upon carry-in or carry-clear. The count enable and reset functions support divide-by-four mode.

The CD74HC190NSR provides a ripple counter with a divide-by-four enable control. The divide-by-four enable input allows the devices to be used as a divide-by-four counter. When enabled, the divide-by-four enable input causes the devices to count in a divide-by-four sequence.

The CD74HC190NSR can be used in applications such as memory addressing, frequency division and rate conversion. It is suitable for use in high-speed counter and timing applications. It can be used to measure frequency, period, pulse width, and duty cycle. Additionally, the device can be used in time-stamp applications.

This IC is available in a variety of package styles including DIP, SOIC and TSSOP. All of these packages have an 8-bit output with outputs 1-4 provided for C-in\C-out and reset each behave as 2-bit outputs. Outputs 5-8 (Q1-Q4) are provided for a 4-bit ripple up/down counter.

The working principle of the CD74HC190NSR is relatively simple. Inputs have been provided for carry-in, carry-clear and reset. Upon each pulse of clock input, the counter advances by one. The inputs instruct the counter to determine the direction of the counting sequence. For instance, when the reset input is enabled, the device counts down from either FFh or FFFh to 00h, depending on the logic state of the carry-clear input. When the carry-in input is enabled, the device will count up from 00h to either FFh or FFFh, depending on the logical state of the reset input.

In addition to the carry-in and carry-clear inputs, the CD74HC190NSR also includes the divide-by-four enable input. When enabled, the device will count in a divide-by-four sequence. The counter will divide the input pulse by four before advancing the stored count output. This feature is useful for measuring frequency, period, pulse width and duty cycle.

The CD74HC190NSR is a robust and versatile IC that is suitable for use in a variety of applications, such as memory addressing, frequency division and rate conversion, and time-stamping. Its 8-bit ripple up/down counter can be used to measure frequency, period, pulse width and duty cycle, and its divide-by-four enable input makes it a great choice for high-speed timing applications.

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