4 bit synchronous up/down counters.
All inputs are equipped with protection circuits against static discharge and transient excess voltage.
NC = No Intern.
The M54/74HC190/191 are high speed CMOS 4-BIT SYNCHRONOUS UP/DOWN COUNTERS fabricated in silicon gate C2MOS technology.
They have the same high speed performance of LSTTL combined with true CMOS low power consumption.
State changes of the counter are.
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