M74HC221RM13TR

Multivibrators Overview

The M74HC221RM13TR is a dual monostable multivibrator from STMicroelectronics, fabricated using silicon gate C2MOS technology. It operates within a supply voltage range of 2V to 6V and supports an operating temperature range of -55°C to 125°C. The device features two trigger inputs per circuit: Input A for negative edge triggering and Input B for positive edge triggering. Propagation delay (A/B to Q/Q) is typically 24ns at VCC = 6V. Quiescent supply current is 4μA maximum in standby mode. Output pulse width is determined by external resistor Rx and capacitor Cx, ranging from 150ns to 60s at VCC = 4.5V.

Multivibrators Feature Summary

• Dual independent monostable multivibrator circuits with separate timing components
• Mixed-edge triggering capability via dedicated negative edge (Input A) and positive edge (Input B) inputs
• Direct reset functionality through the CLR input to terminate the monostable state prematurely
• High noise immunity with Schmitt-trigger characteristics on the direct reset input

Multivibrators Applications

• Pulse generation and waveform shaping
• Timing delays and time-base circuits
• Debouncing switches or contacts
• Frequency division and pulse stretching

Multivibrators Procurement Notes

Verify the specific package type against the ordering code suffix. The RM13TR designation corresponds to the SO-16 surface-mount package. Confirm that the required operating conditions align with the specified voltage and temperature ranges before procurement.

Multivibrators Selection Notes

Select this component when mixed-edge triggering is required for precise timing control. Ensure external Rx and Cx values are chosen to maintain the output pulse width within the desired operational limits. Verify that the load capacitance does not exceed specifications to maintain signal integrity.

Multivibrators Part Context

This part belongs to the M74HC221 series of high-speed CMOS logic devices. It provides dual monostable multivibrator functions compatible with standard 74 series pinouts. The device is designed for applications requiring reliable pulse generation with low power consumption and wide operating voltage flexibility.

Multivibrators Replacement Considerations

Check for functional equivalents such as the M74HC221B1R (DIP package) or M74HC221TTR (TSSOP package) if different mounting styles are needed. Cross-reference with other manufacturers' dual monostable multivibrators ensuring identical pin configurations and electrical parameters.