3-Digit BCD Counter

The MC14553B 3−digit BCD counter consists of 3 negative edge triggered BCD counters that are cascaded synchronously. A quad latch at the output of each counter permits storage of any given count. The information is then time division multiplexed, providing one 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.

Features

• TTL Compatible Outputs

• On−Chip Oscillator

• Cascadable

• Clock Disable Input

• Pulse Shaping Permits Very Slow Rise Times on Input Clock

• Output Latches

• Master Reset

• Pb−Free Packages are Available*