3位BCD计数器 3-Digit BCD Counter
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- .