Details

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Dual Up Counters

Below is the parameter table and instructions for the CD4520BE dual 8-bit binary counter.

Parameter Table

Parameter	Symbol	Min	Typical	Max	Unit
Supply Voltage	VDD	3	-	18	V
Input Voltage (High)	VIH	-	-	VDD - 1.5	V
Input Voltage (Low)	VIL	0	-	VDD - 3.5	V
Output Voltage (High)	VOH	VDD - 1.5	-	VDD - 0.5	V
Output Voltage (Low)	VOL	0	-	0.5	V
Propagation Delay Time	tpd	-	70	150	ns
Power Dissipation	PD	-	-	100	mW
Operating Temperature Range	TA	-40	-	85	掳C
Storage Temperature Range	TSTG	-65	-	150	掳C

Instructions

1. Power Supply:

   • Connect V_DD to the positive supply voltage (3V to 18V).
   • Connect V_SS to ground (0V).

2. Clock Input:

   • Apply the clock signal to the CLK input of each counter.
   • The counters will increment on the rising edge of the clock signal.

3. Reset Input:

   • Connect the reset input (RST) to a logic high level to reset the counter to zero.
   • Connect RST to ground to allow normal counting operation.

4. Enable Inputs:

   • Connect the enable inputs (ENP and ENT) to logic high to enable counting.
   • Connect ENP or ENT to ground to disable counting.

5. Output:

   • The outputs (Q0 to Q7) represent the binary count from 0 to 255 (for each 8-bit counter).
   • The outputs can be used to drive other logic circuits or connected to external devices.

6. Cascade Operation:

   • To cascade multiple CD4520BE counters, connect the carry-out (CO) of one counter to the clock input (CLK) of the next counter.
   • This allows for counting beyond 255 by combining multiple 8-bit counters.

7. Power-On Reset:

   • It is recommended to use a power-on reset circuit to ensure that the counters start from zero when power is applied.
   • A simple RC circuit can be used to generate a reset pulse at power-up.

8. Decoupling Capacitors:

   • Place a 0.1渭F ceramic capacitor between V_DD and V_SS close to the device to reduce noise and improve stability.

9. Handling Precautions:

   • Handle the device with care to avoid damage from electrostatic discharge (ESD).
   • Use proper grounding and handling techniques when working with the device.

10. Storage:

    • Store the device in a dry environment to prevent moisture damage.
    • Follow the storage temperature range specified in the parameter table.

By following these instructions, you can effectively use the CD4520BE dual 8-bit binary counter in your digital circuits.

(For reference only)