Overview
The CD74HC123PWRE4 is a high-speed CMOS logic dual retriggerable monostable multivibrator with reset, manufactured by Texas Instruments. This device is part of the 74HC series, known for its high noise immunity and low power consumption. It is designed to operate over a wide temperature range of -55°C to 125°C, making it suitable for various industrial and commercial applications. The CD74HC123PWRE4 is available in a 16-pin TSSOP package, enhancing its usability in compact designs.
Key Specifications
| Parameter | Symbol | Test Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|---|
| Operating Voltage | VCC | 2 | 6 | V | ||
| High Level Input Voltage | VIH | VCC = 5V | 2 | V | ||
| Low Level Input Voltage | VIL | VCC = 5V | 0.8 | V | ||
| High Level Output Voltage | VOH | VCC = 5V, IOH = -4mA | 4.5 | 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 | 80 | µA | |
| Trigger Propagation Delay | tPLH | CL = 50pF, VCC = 5V | 60 | 90 | ns | |
| Reset Propagation Delay | tPHL, tPLH | CL = 50pF, VCC = 5V | 48 | 72 | ns | |
| Output Pulse Width | tW | RX = 10KΩ, CX = 10nF, VCC = 5V | 38.7 | 51.8 | µs |
Key Features
- Overriding Reset Terminates Output Pulse: The output pulse can be terminated by a LOW level on the Reset (R) pin.
- Triggering From the Leading or Trailing Edge: Trailing edge triggering (A) and leading edge triggering (B) inputs are provided.
- Q and Q Buffered Outputs: Ensures stable output signals.
- Separate Resets: Each monostable multivibrator has its own reset input.
- Wide Range of Output-Pulse Widths: Adjustable using external resistor (RX) and capacitor (CX).
- Schmitt Trigger on Both A and B Inputs: Enhances noise immunity.
- Standard Outputs: Capable of driving up to 10 LSTTL loads.
- Wide Operating Temperature Range: -55°C to 125°C.
- Balanced Propagation Delay and Transition Times: Ensures consistent performance.
- Significant Power Reduction: Compared to LSTTL logic ICs.
Applications
- Timing and Pulse Generation: Ideal for generating precise timing signals and pulses in various electronic circuits.
- Industrial Control Systems: Suitable for use in industrial control systems due to its wide operating temperature range and high noise immunity.
- Automotive Electronics: Can be used in automotive applications where robustness and reliability are critical.
- Medical Devices: Applicable in medical devices requiring precise timing and stable outputs.
- Consumer Electronics: Used in consumer electronics for timing and pulse generation needs.
Q & A
- What is the operating voltage range of the CD74HC123PWRE4?
The operating voltage range is from 2V to 6V.
- What is the temperature range for the CD74HC123PWRE4?
The device operates over a temperature range of -55°C to 125°C.
- How is the output pulse width controlled in the CD74HC123PWRE4?
The output pulse width is controlled by an external resistor (RX) and an external capacitor (CX), with the formula tW = 0.45 RXCX at VCC = 5V.
- What types of triggering are supported by the CD74HC123PWRE4?
The device supports both leading edge and trailing edge triggering.
- Can the output pulse be extended in the CD74HC123PWRE4?
Yes, the output pulse can be extended by retriggering inputs A and B.
- How is the output pulse terminated in the CD74HC123PWRE4?
The output pulse can be terminated by a LOW level on the Reset (R) pin.
- What is the minimum external resistance (RX) required for the CD74HC123PWRE4?
The minimum value of external resistance, RX, is typically 5kΩ.
- What is the significance of Schmitt triggers on the inputs of the CD74HC123PWRE4?
Schmitt triggers enhance noise immunity by providing hysteresis on the input signals.
- How many LSTTL loads can the CD74HC123PWRE4 drive?
The device can drive up to 10 LSTTL loads.
- Is the CD74HC123PWRE4 sensitive to electrostatic discharge?
Yes, the device is sensitive to electrostatic discharge, and proper IC handling procedures should be followed.
