HEF4518BT

The HEF4518B is a dual 4-bit internally synchronous BCD counter. The counter has two clock
inputs (CP0 and CP1 ), buffered outputs from all four bit positions (O0 to O3) and an asynchronous
master reset input (MR). The counter advances on either the LOW to HIGH transition of the CP0
input if CP1 is HIGH or the HIGH to LOW transition of the CP1 input if CP0 is LOW. Either CP0
or CP1 may be used as the clock input to the counter and the other clock input may be used as
a clock enable input. A HIGH on MR resets the counter (O0 to O3 = LOW) independent of CP0
and CP1. Schmitt-trigger action in the clock inputs makes the circuit highly tolerant to slower clock
rise and fall times. Inputs include clamp diodes. This enables the use of current limiting resistors to
interface inputs to voltages in excess of VDD