Details

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BUY SM74HC138D https://www.utsource.net/itm/p/12610685.html

Parameter	Symbol	Min	Typ	Max	Unit
Supply Voltage	Vcc	2.0	-	6.0	V
Output Low Level Voltage	VOL	0.1	-	0.5	V
Output High Level Voltage	VOH	2.7	-	Vcc	V
Input Low Level Voltage	VIL	0.0	-	0.8	V
Input High Level Voltage	VIH	2.0	-	Vcc	V
Output Leakage Current	IOL	-	-	10	渭A
Input Leakage Current	IIH	-	-	1	渭A
Operating Temperature Range	Topr	-40	-	85	掳C
Storage Temperature Range	Tstg	-65	-	150	掳C

Instructions for Use

1. Power Supply:

   • Ensure that the supply voltage (Vcc) is within the specified range of 2.0V to 6.0V.
   • Connect the Vcc pin to the positive power supply and GND to the ground.

2. Input Signals:

   • The input signals (A, B, C, G1, G2A, G2B) should be within the valid logic levels:
     • Low level (0): 0.0V to 0.8V
     • High level (1): 2.0V to Vcc
   • Ensure that the input signals are stable and within the specified voltage ranges to avoid undefined behavior.

3. Output Signals:

   • The output signals (Y0 to Y7) will be active low when the corresponding address inputs match the selected combination and the enable inputs (G1, G2A, G2B) are active.
   • The output low level voltage (VOL) should be between 0.1V and 0.5V.
   • The output high level voltage (VOH) should be at least 2.7V or up to Vcc.

4. Enable Inputs:

   • G1, G2A, and G2B are the enable inputs. The device is enabled when G1 is high, and both G2A and G2B are low.
   • If any of these conditions are not met, all outputs will be high (inactive).

5. Temperature Considerations:

   • The operating temperature range is from -40掳C to 85掳C.
   • The storage temperature range is from -65掳C to 150掳C. Ensure that the device is stored and operated within these temperature limits to prevent damage.

6. Handling and Storage:

   • Handle the device with care to avoid static discharge, which can damage the internal circuitry.
   • Store the device in a dry and cool environment to prevent moisture damage.

7. Testing and Troubleshooting:

   • Verify the supply voltage and input signals using a multimeter to ensure they are within the specified ranges.
   • Check the output signals to confirm that the correct outputs are active low based on the input combinations.
   • If the device does not function as expected, check for proper connections and power supply stability.

(For reference only)