Details

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BUY 74HCT138N https://www.utsource.net/itm/p/12611317.html

Parameter	Symbol	Min	Typ	Max	Unit	Conditions
Supply Voltage	VCC	2.0	4.5	5.5	V	Over recommended operating range
Input Low Voltage	VIL	0	0.8	1.5	V	VCC = 5V
Input High Voltage	VIH	2.0	3.5	5.5	V	VCC = 5V
Output Low Voltage	VOL	0	0.2	0.4	V	IOL = 8 mA, VCC = 5V
Output High Voltage	VOH	2.4	3.6	5.0	V	IOH = -0.4 mA, VCC = 5V
Input Current (Low)	IIL	-1.0	-0.4	-0.1	mA	VIL = 0V, VCC = 5V
Input Current (High)	I<subIH	1.0	0.4	0.1	渭A	VIH = 5V, VCC = 5V
Output Current (Low)	IOL	-24	-10	-2.0	mA	VOL = 0.4V, VCC = 5V
Output Current (High)	IOH	2.0	0.4	0.1	mA	VOH = 2.4V, VCC = 5V
Propagation Delay Time	tpd	12	25	40	ns	VCC = 5V, TA = 25掳C
Power Dissipation	PD	-	-	100	mW	Per output, continuous, VCC = 5V
Operating Temperature	TA	-40	-	85	掳C	Over recommended operating range

Instructions for Using 74HCT138N:

1. Supply Voltage (V_CC):

   • Ensure the supply voltage is within the specified range (2.0V to 5.5V) to avoid damage to the device.

2. Input Levels:

   • Input signals should be within the valid input voltage range (0V to 5.5V) for reliable operation.
   • Use appropriate pull-up or pull-down resistors if necessary to ensure stable logic levels.

3. Output Levels:

   • The output can drive up to 24 mA in the low state and 2.0 mA in the high state.
   • Ensure that the load connected to the outputs does not exceed these current limits to prevent damage.

4. Propagation Delay:

   • The propagation delay time is the time it takes for the output to change state after the input changes. This is important for timing considerations in your circuit.

5. Temperature Range:

   • The device is designed to operate over a wide temperature range (-40掳C to 85掳C). Ensure that the operating environment does not exceed these limits.

6. Power Dissipation:

   • Each output can dissipate up to 100 mW continuously. Ensure proper heat dissipation if driving high-power loads.

7. Pin Configuration:

   • Refer to the pinout diagram provided by the manufacturer to correctly connect the device in your circuit.

8. Decoding Function:

   • The 74HCT138N is a 3-to-8 line decoder/demultiplexer. It has three select inputs (A, B, C) and three enable inputs (G1, G2A, G2B).
   • The enable inputs must be set to the correct logic levels to activate the decoding function:
     • G1 must be high.
     • G2A and G2B must both be low.

9. ** truth Table:**

   • Use the truth table provided in the datasheet to understand the relationship between the select inputs and the active output lines.

10. Storage and Handling:

    • Store the device in a dry, static-free environment to prevent damage.
    • Handle with care to avoid mechanical stress on the pins and package.

By following these guidelines, you can ensure reliable and efficient operation of the 74HCT138N in your circuits.

(For reference only)