IC 74161 Counter 4 Bits with parallel load

The IC 74161 Counter 4 Bits with parallel load is a synchronous 4-bit binary counter from the 74-series logic family. It counts from 0 to 15 on each rising clock edge, can be preset to any starting value through four data inputs, and has a carry output for building longer counters. It is a standard part for frequency dividers, timers and digital electronics labs.

IC 74161 Counter 4 Bits Specifications

• Function: synchronous 4-bit binary counter (0–15)
• Clock: positive-edge triggered
• Parallel load: synchronous, /LOAD active LOW, data inputs A–D
• Clear: asynchronous, /CLR active LOW resets the outputs to 0000
• Count enable: ENP and ENT, both HIGH to count
• Carry: ripple carry output (RCO), HIGH at count 15 while ENT is HIGH
• Supply voltage: 5 V
• Package: 16-pin DIP

IC 74161 Counter 4 Bits Applications

• Frequency dividers from ÷2 to ÷16
• Programmable counters that start from a loaded value
• 8-bit and longer counters by cascading several chips
• Sequence and address generators, timers and digital clocks
• Digital logic labs and university electronics courses

What's in the Box

• 1 × 74161 4-bit binary counter IC

Tip: To cascade two chips, connect RCO of the first to ENT of the second and share the same clock. Tie /LOAD and /CLR HIGH when you do not use them, and place a 100 nF capacitor between VCC (pin 16) and GND (pin 8).

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