Details

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BUY SN74LVC138A https://www.utsource.net/itm/p/9226260.html

Parameter	Conditions	Min	Typ	Max	Unit
Supply Voltage (VCC)	Operating	1.65		3.6	V
Output Low Voltage (VOH)	IO = -4 mA			0.1	V
Output High Voltage (VOL)	IO = 4 mA	2.4		3.6	V
Propagation Delay Time	tPLH, tPHL		5		ns
Power Dissipation	Maximum at TA = 70°C			100	mW
Operating Temperature	Commercial	0		70	°C
Storage Temperature		-65		150	°C

Instructions for SN74LVC138A

1. Power Supply Connection:

   • Connect VCC to the positive supply voltage (between 1.65V and 3.6V).
   • Connect GND to the ground.

2. Signal Inputs:

   • Apply logic levels to A, B, C inputs according to your address decoding requirements.
   • Ensure that input voltages do not exceed VCC or go below GND.

3. Enable Inputs:

   • G1, G2A, and G2B are active low enable pins. For normal operation, set G1 high and G2A, G2B low.

4. Output Handling:

   • Outputs are active low. The output will be low when the corresponding address matches.
   • Ensure external pull-up resistors are used if interfacing with TTL circuits.

5. Propagation Delay:

   • Account for propagation delay in timing diagrams, especially in high-speed applications.

6. Thermal Considerations:

   • Keep the device within specified operating temperature ranges to avoid damage.
   • If operating near maximum power dissipation, consider heat sinking or other cooling methods.

7. Storage and Handling:

   • Store the device in recommended environmental conditions to prevent damage.
   • Handle with care to avoid static discharge; use appropriate ESD protection.

(For reference only)