TEXAS INSTRUMENTS CD40110BE

The CD40110BE is a CMOS Decade Up-down Counter/Latch/Display Driver with a special preconditioning circuit that allows the counter to be clocked, via positive going inputs, up or down regardless of the state or timing (within 100ns typical) of the other clock line. The clock signal is fed into the control logic and Johnson counter after it is preconditioned. The outputs of the Johnson counter (which include anti-lock gating to avoid being locked at an illegal state) are fed into a latch. This data can be fed directly to the decoder through the latch or can be strobed to hold a particular count while the Johnson counter continues to be clocked. The decoder feeds a seven-segment bipolar output driver which can source up to 25mA to drive LEDs and other displays such as low-voltage fluorescent and incandescent lamps. A short durating negative-going pulse appears on the borrow output when the count changes from 0 to 9 or the carry output when the count changes from 9 to 0.