CD4518BE

The Texas Instruments CD4518BE is a CMOS Dual BCD Up-Counter IC. Each of the two identical, internally synchronous 4-stage counters can be incremented on either the positive-going or negative-going transition of the clock signal by interchanging the CLOCK and ENABLE lines. For single-unit operation, the ENABLE input is maintained high, and the counter advances on each positive-going transition of the CLOCK. Counters are cleared by high levels on their RESET lines. The counter can be cascaded in ripple mode by connecting Q4 to the enable input of the subsequent counter while the CLOCK input of the latter is held low.

This device operates with a voltage range of 3 V to 18 V and has an operating temperature range of -55°C to 125°C. It features medium-speed operation with a typical clock frequency of 6 MHz at 10 V. The maximum input current is 1 μA at 18 V over the full package-temperature range. Noise margins are provided for 5 V, 10 V, and 15 V supply voltages.

The CD4518BE is supplied in a 16-lead PDIP (Plastic Dual-In-Line Package) with through-hole mounting. The standard package quantity is 25 units per tube. This component is suitable for multistage synchronous counting, multistage ripple counting, and frequency division applications.