Details

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BUY CD74HCT123E https://www.utsource.net/itm/p/606671.html
LM741 Operational Amplifier; Package: CERDIP; No of Pins: 8

Below is the parameter table and instructions for the CD74HCT123E dual retriggerable monostable multivibrator.

Parameter Table

Parameter	Symbol	Conditions	Min	Typ	Max	Unit
Supply Voltage	VCC		2.0	4.5	5.5	V
Output High Voltage	VOH	IO = -0.4 mA, VCC = 5 V	2.4	2.7	5.0	V
Output Low Voltage	VOL	IO = 16 mA, VCC = 5 V	0.0	0.1	0.4	V
Input High Voltage	VIH	VCC = 5 V	2.0	3.5	5.0	V
Input Low Voltage	VIL	VCC = 5 V	0.0	0.8	1.5	V
Propagation Delay Time	td	VCC = 5 V, TA = 25°C	90	110	130	ns
Minimum Pulse Width (Trigger)	tW	VCC = 5 V, TA = 25°C	50	70	90	ns
Maximum Time Interval (Retrigger)	tR	VCC = 5 V, TA = 25°C	10	20	30	ns
Power Dissipation	PD	VCC = 5 V, TA = 25°C	-	-	100	mW
Operating Temperature Range	TA		-40	-	85	°C
Storage Temperature Range	TSTG		-65	-	150	°C

Instructions

1. Power Supply:

   • Connect the V_CC pin to the positive supply voltage (2.0 V to 5.5 V).
   • Connect the GND pin to the ground.

2. Input Connections:

   • Connect the trigger inputs (A1, A2, B1, B2) to the appropriate signal sources.
   • Use pull-up or pull-down resistors as needed to ensure proper logic levels when the inputs are not actively driven.

3. Output Connections:

   • Connect the output pins (Q1, Q2, /Q1, /Q2) to the load or subsequent circuitry.
   • Ensure that the load current does not exceed the maximum output current ratings.

4. External Components:

   • For timing, use external RC circuits connected to the threshold (R1, R2) and discharge (C1, C2) pins.
   • The time delay (T) can be calculated using the formula: [ T = 1.1 times R times C ]
   • Where R is the resistance in ohms and C is the capacitance in farads.

5. Retriggering:

   • To enable retriggering, connect the output (Q1, Q2) to the trigger input (A1, A2) through an appropriate logic gate or directly if the application allows.
   • The retriggering interval should be greater than the minimum pulse width (t_W) to ensure reliable operation.

6. Reset Function:

   • The reset inputs (MR1, MR2) can be used to force the outputs to a low state.
   • Connect these pins to a high level (V_CC) to disable the reset function.

7. Decoupling Capacitors:

   • Place a 0.1 μF ceramic capacitor close to the V_CC and GND pins to filter out noise and stabilize the power supply.

8. Operating Conditions:

   • Ensure that the operating temperature (T_A) stays within the specified range (-40°C to 85°C) to avoid thermal stress.
   • Store the device within the storage temperature range (-65°C to 150°C) to prevent damage.

By following these instructions, you can effectively use the CD74HCT123E in your digital circuit designs.

(For reference only)