Product Specifications for CD74HCT123M

Product Overview

The CD74HCT123M is a high-speed CMOS logic dual retriggerable monostable multivibrator with resets. It is designed to provide precise timing control and is suitable for a wide range of applications requiring reliable and adjustable pulse generation.

Key Features

• Overriding Reset Terminates Output Pulse: The output pulse can be terminated by a LOW level on the Reset (R) pin.
• Triggering from Leading or Trailing Edge: The device can be triggered by either the leading or trailing edge of the input pulse.
• Q and Q Buffered Outputs: Provides buffered outputs for versatile signal handling.
• Separate Resets: Each monostable has its own reset input.
• Wide Range of Output-Pulse Widths: External resistor (Rx) and capacitor (Cx) control the timing, allowing for a wide range of output pulse widths.
• Schmitt Trigger on Both A and B Inputs: Ensures reliable triggering at specific voltage levels.
• Wide Operating Temperature Range: -55°C to 125°C.
• Balanced Propagation Delay and Transition Times: Ensures consistent performance across different operating conditions.
• Significant Power Reduction Compared to LSTTL Logic ICs: Lower power consumption for energy-efficient designs.

Applications

• Pulse Generation and Control
• Timing Circuits
• Monostable Applications
• Edge-Triggered Logic

Pin Configuration

• Vcc: Power Supply Input
• GND: Ground
• A: Input A
• B: Input B
• R: Reset Input
• Q: Output Q
• Q: Output Q (inverted)
• Cx: External Capacitor Connection
• Rx: External Resistor Connection

Electrical Characteristics

• Supply Voltage Range (Vcc): 4.5V to 5.5V (HCT Types)
• Input Voltage Range (VIL, VIH): 0.8V (Max) to 2V (Min) for HCT Types
• Output Voltage Range (VOH, VOL):VOH: 3.98V to 4.4V (CMOS Loads), 3.7V to 4.4V (TTL Loads) for HCT TypesVOL: 0.1V to 0.26V (CMOS Loads), 0.33V to 0.4V (TTL Loads) for HCT Types
• Input Leakage Current: ±0.1mA to ±1mA
• Quiescent Device Current (Icc): 8μA to 160μA

Ordering Information

• Part Number: CD74HCT123M
• Package: 16-Lead SOIC
• Operating Temperature Range: -55°C to 125°C
• Storage Temperature Range: -65°C to 150°C
• Lead Temperature (Soldering 10s): 300°C

Package Dimensions

• SOIC Package: 16-Lead SOICLength: 16.15mmWidth: 7.5mmHeight: 1.25mm

Absolute Maximum Ratings

• DC Supply Voltage (Vcc): -0.5V to 7V
• DC Input Diode Current (Iik): ±20mA
• DC Output Diode Current (Iok): ±20mA
• Maximum Junction Temperature: 150°C
• Maximum Storage Temperature Range: -65°C to 150°C
• Maximum Lead Temperature (Soldering 10s): 300°C

Switching Specifications (CL = 50pF)

• Trigger Propagation Delay (tPHL): 300ns to 450ns (Vcc = 2V), 60ns to 90ns (Vcc = 4.5V), 51ns to 78ns (Vcc = 6V)
• Reset Propagation Delay (tPLH): 215ns to 325ns (Vcc = 2V), 43ns to 65ns (Vcc = 4.5V), 37ns to 55ns (Vcc = 6V)
• Output Transition Time (tTHL, tTLH): 75ns to 110ns (Vcc = 2V), 15ns to 22ns (Vcc = 4.5V), 13ns to 19ns (Vcc = 6V)
• Output Pulse Width (tw): 45μs (typical for Rx = 10KΩ, Cx = 10nF)

Test Circuits and Waveforms

• Output Pulse Control Using Reset Input: The output pulse can be controlled using the reset input.
• Triggering of Monostable by Input A or B: The monostable can be triggered by either input A or B for a period tw.

Notes

• Time to Trigger: Depends on the values of Rx and Cx. The output pulse width can only be extended when the time between the active-going edges of the trigger input pulses meets the minimum retrigger time requirement.
• Power Dissipation Capacitance (Cpd): Calculated using the formula P=(Cpd+Cx)×Vcc2×f, where f is the input frequency, Vcc is the supply voltage, and Cx is the external capacitance.