资 源 简 介
CD4029B consists of a four-stage binary or BCD-decade up/down counter with provisions for look-ahead carry in both counTIng modes. The inputs consist of a single CLOCK, CARRY-IN (CLOCK ENABLE), BINARY/DECADE, UP/DOWN, PRESET ENABLE, and four individual JAN signals, Q1, Q2, Q3, Q4 and a CARRY OUT signal are provided as outputs.
A high PRESET ENABLE signal allows informaTIon on the JAM INPUTS to preset the counter to any state asynchronously with the clock. A low on each JAM line, when the PRESET-ENABLE signal is high, resets the counter to its zero count. The counter is advanced one count at the posiTIve transiTIon of the clock when the CARRY-IN and PRESET ENALBE signals are low. Advancement is inhibited when the CARRY-IN or PRESET ENABLE signals are high.
