CD4518S

CD4518 Dual BCD Up Counter and CD4520 Dual Binary Up Counter each consist of two identical, internally synchronous 4- stage counters. The counter stages are D- type ffflip- ffflops having interchangeable CLOCK and ENABLE lines for incrementing on either the positive- going or negative- going transition. For single unit operation the ENABLE input is maintained high and the counter advances on each positive- going transition of the CLOCK. The counters are cleared by high levels on their RESET lines. The counter can be cascaded in the ripple mode by connecting Q4 to the enable input of the subsequent counter while the CLOCK input of the latter is held low.

Key features

• Positive or negative edge triggering
• Synchronous internal carry propagation
• 100% tested for quiescent current at 18V
• Maximum input current of 1μA at 18V (temperature: +25℃)
• Standardized symmetrical output characteristics