74HC169 4 bit synchronous up/down binary counter Dip 16 IC

74HC169 4 bit synchronous up/down binary counter Dip 16 IC

The 74HC169 is a 4-bit synchronous up/down binary counter IC from the 74HC high-speed CMOS logic family.
It can count both upwards and downwards depending on the logic level applied to the UP/DOWN control input.

All flip-flops are clocked simultaneously (synchronously), ensuring that all bits change state at the same clock edge — making it faster and more reliable than asynchronous (ripple) counters.

The IC also includes parallel load inputs, allowing a preset binary value to be loaded directly into the counter, and asynchronous clear (reset) to set all outputs LOW.

It’s commonly used in digital systems, frequency dividers, position counters, and timing circuits.

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Key Features:

• Function: 4-bit synchronous up/down binary counter
• Logic Family: 74HC (High-speed CMOS)
• Counting Direction: Selectable UP or DOWN via a control input
• Synchronous Operation: All internal operations are triggered on the same clock edge, ensuring no ripple delay
• Parallel Load: Allows loading of a preset binary value directly into the counter via parallel data inputs
• Asynchronous Master Reset: Resets the counter to zero immediately when activated
• Cascading Capability: Carry and borrow outputs allow chaining multiple counters for wider bit counting
• Operating Voltage: 2V to 6V (typically 5V)

Functional Description

The 74HC169 operates as follows:

• Counting Operation:
• When both CEP and CET are HIGH, and PE\ is HIGH, the counter will count on each rising clock edge.
• The direction of counting is controlled by U/D\ input:
• HIGH ? Count up
• LOW ? Count down
• Parallel Load (Preset):
• When PE\ (active LOW) = LOW, data from inputs P0–P3 are loaded into the counter outputs Q0–Q3 on the next clock edge.
• Clear (Reset):
• When MR (Master Reset) (if present on variant) = LOW, all outputs reset to 0000 immediately (asynchronous).
• Carry/Borrow Output (TC):
• Provides a signal that indicates the counter has reached its maximum or minimum value.
• Useful for cascading multiple 74HC169 counters to form higher-bit counters.

Applications

• Binary up/down counting
• Frequency division
• Digital clocks and timers
• Event and pulse counting
• Position and rotary encoders
• Sequential control systems
• Cascaded counter systems (for 8-bit or 16-bit counting)
• Microcontroller interface counters