3-Digit BCD Counter



The MC14553B 3–digit BCD counter consists of 3 negative edgetriggered BCDcounters that are cascadedsynchronously. A quad latch at the output of each counter permits storage of any given count. The information is then time division multiplexed, providingone BCD number or digit at a time. Digit select outputs provide display control. All outputs are TTL compatible.

An on–chip oscillator provides the low–frequency scanning clock which drives the multiplexer output selector.

This device is used in instrumentation counters,clock displays, digital panel meters, and as a building block for general logic applications.

• TTL Compatible Outputs

• On–Chip Oscillator

• Cascadable

• Clock Disable Input

• Pulse Shaping Permits Very Slow Rise Times on Input Clock

• Output Latches

• Master Reset