Details

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BUY 74HC74 https://www.utsource.net/itm/p/12611394.html

Parameter	Symbol	Conditions	Min	Typ	Max	Unit
Supply Voltage	VCC	Operating	2.0	-	6.0	V
Input Low Voltage	VIL	-	0.3	-	1.5	V
Input High Voltage	VIH	-	3.5	-	VCC	V
Output Low Voltage	VOL	IOL = 4 mA	-	0.1	0.4	V
Output High Voltage	VOH	IOH = -0.4 mA	VCC - 0.1	-	VCC - 0.4	V
Propagation Delay Time (Set)	tpd(S)	VCC = 4.5V, fo = 1 MHz	-	25	45	ns
Propagation Delay Time (Reset)	tpd(R)	VCC = 4.5V, fo = 1 MHz	-	25	45	ns
Set-Up Time	ts	-	10	-	50	ns
Hold Time	th	-	0	-	10	ns
Minimum Pulse Width (Clock)	tpw	-	10	-	50	ns

Instructions for Using 74HC74:

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:

   • Apply logic high (V_IH) or low (V_IL) signals to the data (D), set (S), reset (R), and clock (CP) inputs.
   • Ensure that the input voltages are within the specified range to avoid damage to the device.

3. Output Signals:

   • The Q and Q? outputs will reflect the state of the D input based on the clock and control signals.
   • Ensure that the load connected to the output does not exceed the maximum current ratings.

4. Timing Considerations:

   • Ensure that the setup time (t_s) and hold time (t_h) requirements are met for reliable operation.
   • The minimum pulse width (t_pw) for the clock signal should be observed to prevent metastability issues.

5. Control Signals:

   • The set (S) and reset (R) inputs can be used to force the flip-flop into a known state.
   • When both S and R are low, the flip-flop is controlled by the clock and data inputs.
   • When S is high, the Q output is set to high regardless of the clock and data inputs.
   • When R is high, the Q output is set to low regardless of the clock and data inputs.

6. Propagation Delay:

   • The propagation delay times (t_pd(S) and t_pd(R)) indicate the time it takes for the output to change after the clock edge or control signal transition.

7. Handling:

   • Handle the 74HC74 with care to avoid static discharge, which can damage the device.
   • Store the device in a static-protective bag when not in use.

(For reference only)