74LS169 Synchronous 4-Bit Up Down Binary Counter IC

74LS169 4-Bit Binary Counter IC circuit designed as a synchronous up-down counter in which Synchronous operation provided by all flip-flops clocked simultaneously. As a result,  the outputs change simultaneously as instructed by the steering logic. This mode of operation eliminates the output counting spikes normally related to asynchronous (ripple clock) counters. The outputs of the four master-slave flip-flops  triggered on a low-to-high level transition of the clock input if the enable input is low. A high at the enable input inhibits counting. Level changes at either the enable input or the down-up input made only when the clock input remains high.

This counter made fully programmable that the outputs also preset to either level by placing a low or high.   The load input circuitry allows loading with the carry-enable output of cascaded counters. As loading is synchronous, setting up a low level at the load input disables the counter and causes the outputs to agree with the data inputs after the next clock pulse. The clock down up and load inputs buffered to lower the drive requirement.  This significantly reduces the amount of clock drivers etc required for long parallel words.

The output will change independently of the extent of the clock input. This feature allows the counters to function as modulo-N dividers by simply modifying the count length with the preset inputs. The IC operates a wide range of working conditions, a wide range of operating voltages, and directly interfaces with CMOS, NMOS, and TTL. These compact-sized  IC in terms of chip size provides quite faster propagation speed. Thus makes it highly reliable in every kind of device.

Applications

• Astable frequency divider or counter circuit
• Timing related applications
• Used in digital devices such as digital clocks, electronic meters, and other electronic devices that display numerical information.