Details

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BUY HEF4538 https://www.utsource.net/itm/p/12610344.html

Parameter	Symbol	Min	Typ	Max	Unit	Description
Supply Voltage	VDD	3		18	V	Operating voltage range
Input Low Voltage	VIL	0		0.8	V	Maximum input low voltage level
Input High Voltage	VIH	2		VDD	V	Minimum input high voltage level
Output Low Voltage	VOL	0		0.4	V	Maximum output low voltage level
Output High Voltage	VOH	2.4		VDD	V	Minimum output high voltage level
Propagation Delay Time	tpd		60		ns	Typical propagation delay time
Power Dissipation	PD		50		mW	Maximum power dissipation per package
Operating Temperature Range	TOPR	-40		85	掳C	Operating temperature range

Instructions for HEF4538

1. Power Supply Connection:

   • Connect the VDD pin to a supply voltage between 3V and 18V.
   • Ensure proper decoupling capacitors are placed close to the power pins to reduce noise.

2. Input Signal Levels:

   • Inputs should be driven by signals that respect the VIL and VIH levels to ensure reliable operation.
   • Avoid floating inputs; they should be tied to either VDD or GND when not in use.

3. Output Handling:

   • Outputs can drive loads within the specified VOH and VOL limits.
   • Ensure the load connected to the output does not exceed the maximum current rating of the device.

4. Propagation Delay:

   • Account for the typical propagation delay (tpd) in timing calculations for synchronous circuits.

5. Thermal Considerations:

   • Monitor the operating temperature to ensure it stays within the specified range (-40掳C to +85掳C).
   • If necessary, provide adequate heat sinking to manage power dissipation.

6. Handling Precautions:

   • The HEF4538 is sensitive to electrostatic discharge (ESD). Use appropriate ESD protection measures during handling and installation.
   • Follow good soldering practices to avoid damage from excessive heat.

(For reference only)