Details

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BUY SN74HC148N https://www.utsource.net/itm/p/12541856.html

Parameter	Symbol	Min	Typ	Max	Unit
Operating Supply Voltage	VCC	2.0	-	6.0	V
Input Low Voltage	VIL	-0.5	-	1.5	V
Input High Voltage	V<subIH	3.5	-	VCC+0.5	V
Output Low Voltage	VOL	-0.5	-	0.4	V
Output High Voltage	VOH	2.4	-	VCC	V
Input Leakage Current	IIL	-1.0	-	1.0	μA
Output Sink Current (per pin)	IOL	-	25	-	mA
Output Source Current (per pin)	IOH	-	4	-	mA
Propagation Delay Time	tpd	-	12	-	ns
Power Dissipation	PD	-	-	500	mW

Instructions for Using SN74HC148N

1. Power Supply:

   • Connect the V_CC pin to the positive supply voltage (2.0V to 6.0V).
   • Connect the GND pin to the ground.

2. Input Signals:

   • Ensure that the input signals are within the specified range:
     • Low level: 0V to 1.5V
     • High level: 3.5V to V_CC

3. Output Signals:

   • The outputs will be:
     • Low level: 0V to 0.4V
     • High level: 2.4V to V_CC
   • Ensure that the load connected to the output pins does not exceed the maximum sink and source currents.

4. Propagation Delay:

   • The typical propagation delay time is 12 nanoseconds. This should be considered when designing timing-critical circuits.

5. Power Dissipation:

   • The maximum power dissipation is 500 milliwatts. Ensure proper heat dissipation if operating near this limit.

6. Handling:

   • The device is sensitive to electrostatic discharge (ESD). Use appropriate ESD protection measures during handling and installation.

7. Pin Configuration:

   • Refer to the datasheet for the specific pin configuration and functions of each pin.

8. Application Notes:

   • The SN74HC148N is a priority encoder. It converts the active-low inputs into a binary code. The highest priority input (lowest pin number) overrides lower priority inputs.
   • The device has an active-low enable input (EI) and an active-low enable output (EO) for cascading multiple encoders.

9. Testing:

   • Before integrating the device into a circuit, test it with known input signals to ensure it is functioning correctly.

10. Storage:

    • Store the device in a dry, cool place to prevent damage from moisture and temperature extremes.

(For reference only)