CD4516BE | Texas Instruments

Presettable Binary Up/Down Counter, CD4516BE, Texas Instruments

The CD4516BE Presettable Binary Up/Down Counter consists of four synchronously clocked D-type flip-flop (with a gating structure to provide T-type flip-flop capability) connected as counter. This counter can be cleared by a high level on the RESET line, and can be preset to any binary number present on the jam input by a high level on the PRESET ENABLE line. The CD4516BE will count out of non-BCD counter state in a maximum of two clock pulse in the up mode, and a maximum of four clock pulse in the down mode. If the CARRY-IN input is held low, the counter advances up or down on each positive-going clock transition. Synchronous cascading is accomplished by connecting all clock input in parallel and connecting the CARRY-OUT of a less significant stage to the CARRY-IN of a more significant stage.

The CD4516BE can be cascaded in the ripple mode by connecting the CARRY-OUT to the clock of the next stage. If the UP/DOWN input changes during a terminal count, the CARRY-OUT must be gated with the clock, and the UP/DOWN input must change while the clock is high. This method provides a clean clock signal to the subsequent counting stage.

Features

• Synchronous internal carry propagation
• Reset and Preset capability
• 100% tested for quiescent current at 20 V
• Standardized, symmetrical output characteristics

Applications

• Up/Down difference counting
• Multistage synchronous counting
• Multistage ripple counting
• Synchronous frequency dividers