Details

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BUY SN74HC138N. https://www.utsource.net/itm/p/12608723.html

Parameter	Conditions	Min	Typ	Max	Unit
Supply Voltage (VCC)		2.0		6.0	V
Output Low Voltage (VOH)	IO = -4mA, VCC = 5V		0.1		V
Output High Voltage (VOL)	IO = 16mA, VCC = 5V		3.7		V
Input Leakage Current (II)	VIN = 0V to VCC	-1		1	渭A
Propagation Delay Time	tPLH, tPHL, VCC = 5V, TA = 25掳C		18		ns
Power Dissipation	Per Package			500	mW

Instructions for SN74HC138N

1. Power Supply:

   • Connect the supply voltage (VCC) between 2.0V and 6.0V.
   • Ensure a stable power supply to prevent erratic behavior.

2. Input Handling:

   • Be cautious with input voltages; they should not exceed VCC or go below GND to avoid damaging the device.
   • Keep input leakage currents within specified limits to ensure reliable operation.

3. Output Configuration:

   • The output low voltage (VOH) should be no higher than 0.1V when sourcing up to -4mA.
   • The output high voltage (VOL) should be at least 3.7V when sinking up to 16mA.

4. Propagation Delay:

   • Account for a typical propagation delay of 18ns under standard conditions (VCC = 5V, TA = 25掳C).

5. Thermal Management:

   • Ensure that the power dissipation does not exceed 500mW per package to maintain operational integrity.

6. Application Specific:

   • This device is an 8-line to 3-line priority encoder. Ensure proper connection of enable inputs and outputs according to your application requirements.

7. Storage and Handling:

   • Store in a dry environment and handle with care to prevent electrostatic discharge (ESD) damage.

8. Testing and Validation:

   • Before deploying in a critical application, thoroughly test the device under expected operating conditions to validate performance and reliability.

(For reference only)