Details

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BUY SN74H21N https://www.utsource.net/itm/p/12611525.html

Parameter	Symbol	Min	Typ	Max	Unit
Supply Voltage	VCC	4.75	5	5.25	V
Input High Voltage	VIH	2.0	-	VCC	V
Input Low Voltage	VIL	0	-	0.8	V
Output High Voltage	VOH	2.4	-	VCC - 0.5	V
Output Low Voltage	VOL	0	-	0.5	V
Input Current (High)	IIH	-	1	20	渭A
Input Current (Low)	IIL	-1	-0.4	-	mA
Output Current (High)	IOH	-400	-10	-	渭A
Output Current (Low)	IOL	-	8	16	mA
Propagation Delay Time	tpd	22	33	45	ns
Power Dissipation	PD	-	-	500	mW

Instructions for Use

1. Supply Voltage:

   • Ensure the supply voltage (V_CC) is within the range of 4.75V to 5.25V to avoid damage to the device.

2. Input Levels:

   • For a logic high input, ensure the voltage is at least 2.0V.
   • For a logic low input, ensure the voltage is no more than 0.8V.

3. Output Levels:

   • The output high voltage should be at least 2.4V when the device is powered by 5V.
   • The output low voltage should not exceed 0.5V.

4. Current Ratings:

   • The maximum input current for a high input is 20渭A.
   • The maximum input current for a low input is -0.4mA.
   • The maximum output current for a high output is -400渭A.
   • The maximum output current for a low output is 16mA.

5. Propagation Delay:

   • The propagation delay time (t_pd) is typically between 22ns and 45ns, depending on the operating conditions.

6. Power Dissipation:

   • The maximum power dissipation (P_D) is 500mW. Ensure adequate heat sinking if operating near this limit.

7. Handling:

   • Handle the SN74H21N with care to avoid static discharge, which can damage the device.
   • Use appropriate ESD protection measures during handling and installation.

8. Mounting:

   • Ensure proper mounting and soldering techniques to avoid mechanical stress on the device.

9. Testing:

   • Test the device under specified operating conditions to ensure it meets the required performance parameters.

(For reference only)