Details

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BUY SN74LS191N. https://www.utsource.net/itm/p/12610290.html

Parameter	Symbol	Conditions	Min	Typ	Max	Unit
Supply Voltage	VCC	Operating	4.75	5.0	5.25	V
Input Voltage (High Level)	VIH	Input High Level	2.0	-	5.25	V
Input Voltage (Low Level)	VIL	Input Low Level	0.0	-	0.8	V
Output Voltage (High Level)	VOH	IO = -0.4 mA	2.4	-	5.0	V
Output Voltage (Low Level)	VOL	IO = 16 mA	0.0	-	0.5	V
Input Current (High Level)	IIH	VI = 5.0 V	-0.04	-	0.4	mA
Input Current (Low Level)	IIL	VI = 0.0 V	-0.4	-	1.6	mA
Output Current (High Level)	IOH	VO = 2.4 V	-0.4	-	-	mA
Output Current (Low Level)	IOL	VO = 0.5 V	-	-	16	mA
Propagation Delay Time	tpd	Typical, VCC = 5.0 V	-	34	-	ns
Power Dissipation	PD	Maximum, Per Package	-	-	500	mW

Instructions for Using SN74LS191N:

1. Power Supply:

   • Connect the V_CC pin to a 5V power supply.
   • Connect the GND pin to ground.

2. Input Signals:

   • Ensure that input signals are within the specified voltage levels (V_IH and V_IL).
   • Use appropriate pull-up or pull-down resistors if necessary to maintain signal integrity.

3. Output Signals:

   • Ensure that the load connected to the output does not exceed the maximum output current ratings (I_OH and I_OL).
   • Use external buffers or drivers if driving high-capacitance loads.

4. Clock and Control Signals:

   • Apply clock signals to the CP (clock) pin.
   • Use the UP, DOWN, and LOAD pins to control the direction and mode of operation.
   • The MR (master reset) pin can be used to reset the counter.

5. Propagation Delay:

   • Account for the propagation delay time (t_pd) in your timing calculations to ensure proper synchronization.

6. Power Dissipation:

   • Ensure that the total power dissipation does not exceed 500 mW to avoid overheating and potential damage to the device.
   • Use heat sinks or other cooling methods if operating near the maximum power dissipation.

7. Storage and Handling:

   • Store the device in a dry, static-free environment.
   • Handle with care to avoid physical damage and electrostatic discharge (ESD).

By following these instructions, you can ensure reliable operation of the SN74LS191N in your circuit design.

(For reference only)