Overview
The CD74HC123MTG4, produced by Texas Instruments, is a high-speed CMOS logic dual retriggerable monostable multivibrator with resets. This device is part of the 74HC series and is known for its versatility and reliability in various electronic circuits. It features two independent monostable multivibrators, each capable of generating a single output pulse of a fixed duration in response to a trigger input. The device is retriggerable, meaning the output pulse width can be extended by retriggering the inputs A and B. The CD74HC123MTG4 is available in a 16-lead SOIC package and operates over a wide temperature range of -55°C to 125°C.
Key Specifications
| Parameter | Symbol | Test Conditions | Min | Max | Units | |
|---|---|---|---|---|---|---|
| Supply Voltage | VCC | 2 | 5 | 6 | V | |
| High Level Input Voltage | VIH | VCC = 5V | 3.7 | V | ||
| Low Level Input Voltage | VIL | VCC = 5V | 1.3 | V | ||
| High Level Output Voltage | VOH | VCC = 5V, IOH = -4mA | 4.4 | V | ||
| Low Level Output Voltage | VOL | VCC = 5V, IOL = 4mA | 0.26 | V | ||
| Input Leakage Current | II | VCC or GND | ±1 | µA | ||
| Quiescent Device Current | ICC | VCC or GND | 8 | 160 | µA | |
| Trigger Propagation Delay | tPLH | CL = 50pF, VCC = 5V | 60 | 90 | ns | |
| Output Pulse Width | tW | RX = 10KΩ, CX = 10nF, VCC = 5V | 38.7 | 45 | 51.3 | µs |
Key Features
- Dual Monostable Multivibrators: The CD74HC123MTG4 features two independent monostable multivibrators, each capable of generating a single output pulse.
- Retriggerable: The output pulse width can be extended by retriggering the inputs A and B.
- External Timing Control: The timing and accuracy of the circuit are controlled by external resistor (RX) and capacitor (CX).
- Edge Triggering: Trailing edge triggering (A) and leading edge triggering (B) inputs are provided for triggering from either edge of the input pulse.
- Reset Functionality: The output pulse can be terminated by a LOW level on the Reset (R) pin.
- CMOS and TTL Compatibility: The device is compatible with both CMOS and TTL input logic levels.
- Wide Temperature Range: Operates over a temperature range of -55°C to 125°C.
Applications
- Pulse Generation: Used in circuits requiring the generation of precise timing pulses.
- Timing Circuits: Suitable for applications where adjustable timing is necessary.
- Sequential Logic Circuits: Can be used in sequential logic circuits to control the timing of events.
- Automotive and Industrial Systems: Due to its wide temperature range, it is suitable for use in automotive and industrial environments.
- Consumer Electronics: Used in various consumer electronic devices requiring precise timing and pulse generation.
Q & A
- What is the CD74HC123MTG4?
The CD74HC123MTG4 is a high-speed CMOS logic dual retriggerable monostable multivibrator with resets produced by Texas Instruments.
- What is the operating temperature range of the CD74HC123MTG4?
The device operates over a temperature range of -55°C to 125°C.
- How is the output pulse width controlled in the CD74HC123MTG4?
The output pulse width is controlled by an external resistor (RX) and an external capacitor (CX).
- Can the output pulse be extended in the CD74HC123MTG4?
- How can the output pulse be terminated in the CD74HC123MTG4?
The output pulse can be terminated by a LOW level on the Reset (R) pin.
- What types of triggering are supported by the CD74HC123MTG4?
The device supports trailing edge triggering (A) and leading edge triggering (B).
- Is the CD74HC123MTG4 compatible with TTL logic levels?
- What is the typical minimum value of the external resistance (RX) for the CD74HC123MTG4?
The typical minimum value of the external resistance (RX) is 5kΩ.
- What is the formula for calculating the output pulse width in the CD74HC123MTG4?
The output pulse width is calculated using the formula tW = 0.45 RXCX at VCC = 5V.
- What are some common applications of the CD74HC123MTG4?
The device is commonly used in pulse generation, timing circuits, sequential logic circuits, automotive and industrial systems, and consumer electronics.
