CD4017BE is a Decade Counter IC (Integrated Circuit) from the CD4000 series of logic ICs. It is commonly used in digital circuits for counting applications. 
 Specifications:
Type: Decade Counter
Series: CD4000
Package Type: Typically available in 16-pin Dual In-Line Package (DIP) or Surface-Mount Package (SMD).
Voltage Supply: 3V to 18V (5V is commonly used)
Counter Type: Decade counter (mod-10, counts from 0 to 9)
Output Pins: 10 output pins, Q0 to Q9, with each corresponding to a specific count.
Shift Register: The CD4017BE uses a 10-stage Johnson decade counter with a ripple-carry output.
Clock Input (pin 14): A positive-edge-triggered clock input.
Reset Pin (pin 15): A reset pin that resets the counter to zero when activated.
Enable Pins (pin 6 and pin 2): Enable inputs for the count sequence; these can be used to disable certain outputs or modify counting behavior.
Output Type: All outputs are high when not selected (open collector output).
Carry-Out Pin (pin 11): Provides a carry-out pulse after the 10th clock pulse, used for cascading with other CD4017s or other logic.
Features:
Decade Counting: Counts from 0 to 9, then resets automatically and starts again.
Low Power Consumption: Operates with very low power, especially in applications requiring battery power.
Cascade Capability: Can be cascaded to extend counting to higher numbers by linking the carry-out (CO) to the clock of another CD4017BE IC.
High Noise Immunity: Built-in noise rejection helps the IC function reliably in noisy environments.
Typical Applications:
Digital counters
Pulse dividers
Timing applications
LED displays (for creating sequences or patterns)
Sequential control systems