74HC191D,653

Counter Dividers Overview

The Nexperia 74HC191D,653 is a presettable synchronous 4-bit binary up/down counter housed in a 16-lead SO plastic small outline package (SOT109-1). It operates within a supply voltage range of 2.0 V to 6.0 V and supports an ambient temperature range from -40 °C to +125 °C. The device features asynchronous parallel load capability, allowing the counter to be preset to any desired value via inputs D0 to D3 when the parallel load input is LOW. Counting direction is controlled by a single up/down input signal, while counting is inhibited by a HIGH level on the count enable input.

Counter Dividers Feature Summary

• Synchronous reversible counting with up or down direction control
• Asynchronous parallel load for immediate presetting to any value
• Terminal count and ripple clock outputs for multistage expansion

Counter Dividers Applications

• Presettable binary counters
• Frequency dividers
• Timing generation circuits
• Digital sequence generators

Counter Dividers Procurement Notes

Verify the component matches the exact part number 74HC191D,653 and manufacturer Nexperia USA Inc. Confirm the package type is SO16 (SOT109-1) and the temperature grade covers the required operating range. Ensure documentation aligns with the latest product data sheet revision to validate specifications and compliance standards.

Counter Dividers Selection Notes

Select this component for applications requiring a compact 4-bit binary counter with synchronous operation and flexible preset capabilities. The wide supply voltage range accommodates various logic families, while the single up/down control simplifies interface design. Verify that the package dimensions and thermal characteristics suit the target PCB layout and environmental conditions.

Counter Dividers Part Context

This device belongs to the 74HC series of high-speed CMOS logic components manufactured by Nexperia. It provides a standard solution for digital counting tasks within industrial and consumer electronics. The 74HC191 variant specifically offers bidirectional counting and parallel loading, distinguishing it from fixed-count or unidirectional counter counterparts in the same logic family.

Counter Dividers Replacement Considerations

• 74HC191PW,653

Counter Dividers FAQ

How is the counting direction determined?

The counting direction is determined by the state of the U/D input signal. A specific logic level selects either count-up or count-down mode.

What is the function of the TC output?

The Terminal Count (TC) output indicates when the counter reaches its maximum value in count-up mode or zero in count-down mode. It remains active until a state change occurs.