Overview
The CD74HC123PWRG4 is a high-speed CMOS logic dual retriggerable monostable multivibrator with reset, produced by Texas Instruments. This device is part of the 74HC series, known for its high-speed and low-power consumption. It is designed to generate a single pulse of a fixed duration in response to a trigger input, making it versatile for various timing and pulse generation applications.
The device is available in a 16-pin TSSOP package and operates over a wide temperature range of -55°C to 125°C. It is retriggerable, meaning the output pulse can be extended by additional trigger inputs, and it includes a reset feature to terminate the output pulse. This component is suitable for use in digital circuits requiring precise timing and pulse control.
Key Specifications
| Parameter | Symbol | Test Conditions | Units | Min | ||
|---|---|---|---|---|---|---|
| Supply Voltage | VCC | - | V | 2 | - | 6 |
| High Level Input Voltage | VIH | VCC = 5V | V | - | - | 2 |
| Low Level Input Voltage | VIL | VCC = 5V | V | 0.5 | - | - |
| High Level Output Voltage (CMOS Loads) | VOH | VCC = 5V, IOH = -20µA | V | 4.4 | - | - |
| Low Level Output Voltage (CMOS Loads) | VOL | VCC = 5V, IOL = 20µA | V | - | - | 0.1 |
| Input Leakage Current | II | VCC or GND | µA | - | - | ±1 |
| Quiescent Device Current | ICC | VCC or GND | µA | 0 | - | 80 |
| Output Pulse Width | tW | RX = 10KΩ, CX = 10nF | µs | 38.7 | 45 | 51.3 |
| Trigger Propagation Delay | tPLH | CL = 50pF | ns | 60 | - | 90 |
Key Features
- Retriggerable Monostable Multivibrator: The device can extend the output pulse width by retriggering inputs A and B.
- Reset Feature: The output pulse can be terminated by a LOW level on the Reset (R) pin.
- Trailing and Leading Edge Triggering: Inputs A and B provide trailing edge and leading edge triggering respectively.
- Adjustable Pulse Width: The output pulse width can be adjusted using external resistor (RX) and capacitor (CX).
- High-Speed CMOS Logic: Operates at high speeds with low power consumption.
- Wide Temperature Range: Operates from -55°C to 125°C.
- Multiple Package Options: Available in various packages including PDIP, SOIC, SOP, and TSSOP.
Applications
- Timing and Pulse Generation: Used in circuits requiring precise timing and pulse generation.
- Digital Circuits: Suitable for use in digital circuits needing controlled pulse widths.
- Automotive and Industrial Systems: Due to its wide temperature range, it is suitable for automotive and industrial applications.
- Communication Systems: Can be used in communication systems for timing and synchronization purposes.
- Consumer Electronics: Used in various consumer electronic devices requiring timing and pulse control.
Q & A
- What is the CD74HC123PWRG4?
The CD74HC123PWRG4 is a high-speed CMOS logic dual retriggerable monostable multivibrator with reset, produced by Texas Instruments.
- What is the operating temperature range of the CD74HC123PWRG4?
The device operates over a temperature range of -55°C to 125°C.
- How can the output pulse width be adjusted?
The output pulse width can be adjusted using an external resistor (RX) and capacitor (CX).
- What is the significance of the reset feature?
The reset feature allows the output pulse to be terminated by a LOW level on the Reset (R) pin.
- Can the device be retriggered?
Yes, the device is retriggerable, allowing the output pulse width to be extended by additional trigger inputs.
- What are the typical applications of the CD74HC123PWRG4?
It is used in timing and pulse generation, digital circuits, automotive and industrial systems, communication systems, and consumer electronics.
- What are the package options available for the CD74HC123PWRG4?
The device is available in various packages including PDIP, SOIC, SOP, and TSSOP.
- How does the device handle input triggering?
The device provides trailing edge triggering on input A and leading edge triggering on input B.
- What is the minimum value of external resistance (RX) required?
The minimum value of external resistance (RX) is typically 5kΩ.
- What is the formula for calculating the output pulse width?
The output pulse width can be calculated using the formula tW = 0.45 RXCX at VCC = 5V.
