Details

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BUY HEF4021BP https://www.utsource.net/itm/p/12610713.html

Parameter	Symbol	Min	Typ	Max	Unit	Conditions
Supply Voltage	VDD	3	-	15	V	-
Input Low Voltage	VIL	0	-	1.5	V	VDD = 5V
Input High Voltage	VIH	3.5	-	VDD	V	VDD = 5V
Output Low Voltage	VOL	0	-	0.4	V	IL = 4mA, VDD = 5V
Output High Voltage	VOH	2.4	-	VDD	V	IH = -0.4mA, VDD = 5V
Input Current	IIN	-1	-	1	渭A	VDD = 5V
Output Current (Low)	IOL	-	-	-10	mA	VDD = 5V, VOL = 0.4V
Output Current (High)	IOH	-	-	2.5	mA	VDD = 5V, VOH = 2.4V
Propagation Delay Time	tpd	-	30	100	ns	VDD = 5V, f = 10kHz
Power Dissipation	PD	-	-	100	mW	-

Instructions for Using the HEF4021BP

1. Supply Voltage:

   • The HEF4021BP operates within a supply voltage range of 3V to 15V. Ensure that the supply voltage is stable and within this range to avoid damage to the device.

2. Input Levels:

   • For proper operation, input signals should be within the specified voltage levels:
     • Input Low (V_IL): 0V to 1.5V when V_DD = 5V.
     • Input High (V_IH): 3.5V to V_DD when V_DD = 5V.
   • Ensure that input signals do not exceed these levels to prevent incorrect operation or damage.

3. Output Levels:

   • The output voltages are defined as:
     • Output Low (V_OL): 0V to 0.4V when I_L = 4mA and V_DD = 5V.
     • Output High (V_OH): 2.4V to V_DD when I_H = -0.4mA and V_DD = 5V.
   • These levels ensure compatibility with other digital circuits.

4. Current Ratings:

   • The maximum output current for low and high states are:
     • Output Low (I_OL): -10mA.
     • Output High (I_OH): 2.5mA.
   • Ensure that the load connected to the outputs does not exceed these current ratings.

5. Propagation Delay:

   • The propagation delay time (t_pd) is the time it takes for a change in the input signal to affect the output. It typically ranges from 30ns to 100ns at V_DD = 5V and f = 10kHz.
   • This parameter is crucial for timing considerations in your circuit design.

6. Power Dissipation:

   • The maximum power dissipation (P_D) is 100mW. Ensure that the total power dissipation in the device does not exceed this limit to avoid overheating and potential damage.

7. Handling and Storage:

   • Handle the HEF4021BP with care to avoid static damage. Use appropriate ESD protection measures.
   • Store the device in a dry, cool place to maintain its performance and longevity.

8. Circuit Design:

   • When designing circuits with the HEF4021BP, consider using decoupling capacitors close to the power pins to filter out noise and stabilize the supply voltage.
   • Ensure that all unused inputs are tied to a known state (either V_DD or GND) to prevent floating inputs which can cause erratic behavior.

By following these guidelines, you can ensure reliable and efficient operation of the HEF4021BP in your digital circuits.

(For reference only)