DESCRIPTION
CD40102BMS and CD40103BMS consist of an 8-stage synchronous down counter with a single output which is active when the internal count is zero. The CD40102BMS is configured as two cascaded 4-bit BCD counters, and All control inputs and the CARRY-OUT/ZERO-DETECT output are active-low logic. In normal operation, the counter is decremented by one count on each positive transition of the CLOCK. Counting is inhibited when the CARRY-IN/COUNTER ENABLE (CI/CE) inputs is high. The CARRY-OUT/ZERO-DETECT (CO/ZD) output goes low when the count reaches zero if the CI/CE input is low, and remains low for one full clock period. When the SYNCHRONOUS PRESET-ENABLE (SPE) input is low, data at the JAM input is clocked into the counter on the next positive clock transition regardless of the state of the CI/CE input. When the ASYNCHRONOUS PRESETENABLE (APE) input is low, data at the JAM inputs is asynchronously forced into the counter regardless of the state of the SPE, CI/CE, or CLOCK inputs. JAM inputs J0-J7 represent two 4-bit BCD words for the CD40102BMS and a single 8-bit binary word for the CD40103BMS.
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