74HCT123D-Q100,115

Basic Information Overview

• Category: Integrated Circuit (IC)
• Use: Multivibrator and Monostable Multivibrator
• Characteristics: High-speed operation, low power consumption, wide supply voltage range
• Package: SOIC-16
• Essence: Dual retriggerable monostable multivibrator
• Packaging/Quantity: Tape and Reel, 2500 pieces per reel

Specifications

• Supply Voltage Range: 2.0V to 6.0V
• Input Voltage Range: -0.5V to VCC + 0.5V
• Output Voltage Range: GND to VCC
• Operating Temperature Range: -40°C to +125°C
• Propagation Delay Time: 23 ns at 4.5V
• Trigger Pulse Width: 28 ns at 4.5V
• Triggering from Leading or Trailing Edge
• Schmitt-trigger Action on All Inputs

Detailed Pin Configuration

1. CLR (Clear) - Active LOW input for resetting the internal flip-flop
2. A (Trigger) - Active HIGH input for triggering the multivibrator
3. B (Retrigger) - Active HIGH input for retriggering the multivibrator
4. Q (Output) - Output of the multivibrator
5. GND (Ground) - Ground reference for the IC
6. Qn (Complementary Output) - Complementary output of the multivibrator
7. RCext (External Resistor/Capacitor) - External resistor/capacitor connection for timing control
8. VCC (Supply Voltage) - Positive supply voltage for the IC
9. NC (No Connection) - No electrical connection
10. NC (No Connection) - No electrical connection
11. NC (No Connection) - No electrical connection
12. NC (No Connection) - No electrical connection
13. NC (No Connection) - No electrical connection
14. NC (No Connection) - No electrical connection
15. NC (No Connection) - No electrical connection
16. NC (No Connection) - No electrical connection

Functional Features

• Dual retriggerable monostable multivibrator with Schmitt-trigger inputs
• Can be triggered from either the leading or trailing edge of the input pulse
• Retriggering is possible by applying a new trigger pulse before the output goes LOW
• Output pulse width can be controlled using an external resistor and capacitor
• Schmitt-trigger action on all inputs ensures noise immunity and hysteresis

Advantages and Disadvantages

Advantages

• High-speed operation allows for quick response times
• Low power consumption makes it suitable for battery-powered applications
• Wide supply voltage range provides flexibility in different operating conditions
• Retriggerable feature enables precise timing control
• Schmitt-trigger inputs ensure reliable operation in noisy environments

Disadvantages

• Limited number of available pins restricts the functionality of the IC
• External components required for timing control may increase the overall circuit complexity

Working Principles

The 74HCT123D-Q100,115 is a dual retriggerable monostable multivibrator. It operates based on the principles of triggering and timing control. When a trigger pulse is applied to the A input, the internal flip-flop is set, and the Q output goes HIGH. The output remains HIGH for a duration determined by the external resistor and capacitor connected to the RCext pin.

If a retrigger pulse is applied to the B input before the output goes LOW, the internal flip-flop is reset, and the output pulse width is extended. This retriggering capability allows for precise timing control and the generation of longer output pulses.

The Schmitt-trigger action on all inputs ensures noise immunity and hysteresis, making the IC reliable in noisy environments.

Detailed Application Field Plans

• Timing circuits: The 74HCT123D-Q100,115 can be used in various timing applications, such as pulse width modulation, frequency division, and time delay generation.
• Communication systems: It can be employed in communication systems for signal synchronization, pulse shaping, and data transmission.
• Industrial automation: The IC finds application in industrial automation for controlling timing sequences, triggering events, and generating precise time intervals.
• Automotive electronics: It can be utilized in automotive electronics for functions like engine control, lighting control, and sensor interfacing.

Detailed and Complete Alternative Models

• CD74HC123E: Dual retriggerable monostable multivibrator with similar specifications and pin configuration.
• SN74LS123N: Monostable multivibrator with different trigger and retrigger inputs but compatible functionality.
• MC14538B: Dual precision monostable multivibrator with additional features like adjustable pulse width and complementary outputs.