Details

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BUY SN74LS645N https://www.utsource.net/itm/p/11698229.html
IC TXRX NON-INVERT 5.25V 20DIP

Parameter	Symbol	Min	Typ	Max	Unit
Supply Voltage	VCC	4.75	5.0	5.25	V
Input Voltage (Low)	VIL	0.0	-	0.8	V
Input Voltage (High)	VIH	2.0	-	VCC	V
Output Voltage (Low)	VOL	0.0	0.4	0.5	V
Output Voltage (High)	VOH	2.4	2.7	VCC - 0.5	V
Input Current (Low)	IIL	-1.6	-	-	mA
Input Current (High)	IIH	-	-	40	μA
Output Current (Low)	IOL	-	-	-400	mA
Output Current (High)	IOH	-400	-	-	mA
Propagation Delay Time	tpd	12	15	18	ns
Power Dissipation	PD	-	-	500	mW
Operating Temperature Range	TA	-55	-	125	°C
Storage Temperature Range	TSTG	-65	-	150	°C

Instructions for Using SN74LS645N

1. Power Supply:

   • Ensure the supply voltage (V_CC) is within the specified range of 4.75V to 5.25V.
   • Connect the ground (GND) pin to a stable ground reference.

2. Input Signals:

   • Apply input signals within the valid logic levels:
     • Low: 0V to 0.8V
     • High: 2.0V to V_CC
   • Ensure the input current does not exceed the maximum ratings.

3. Output Signals:

   • The output signals will be:
     • Low: 0V to 0.5V
     • High: 2.4V to V_CC - 0.5V
   • Ensure the output current does not exceed the maximum ratings.

4. Propagation Delay:

   • The propagation delay time (t_pd) is the time it takes for the output to change state after the input changes. It ranges from 12ns to 18ns.

5. Temperature Considerations:

   • The device can operate within a temperature range of -55°C to 125°C.
   • Store the device in a temperature range of -65°C to 150°C.

6. Power Dissipation:

   • The maximum power dissipation is 500mW. Ensure proper heat sinking or cooling if operating near this limit.

7. Handling:

   • Handle the device with care to avoid static discharge, which can damage the internal circuits.
   • Follow ESD (Electrostatic Discharge) precautions during handling and assembly.

8. Testing:

   • Before integrating the device into a circuit, test it using a known good setup to ensure it meets the specified parameters.

9. Application Notes:

   • Refer to the datasheet for detailed application notes and recommended usage guidelines.

By following these instructions, you can ensure reliable operation of the SN74LS645N in your electronic designs.

(For reference only)