74VHC221AMTCX Dual Monostable Multivibrator with 2-5.5V Operation 5.5V-Tolerant

Product Specification

74VHC221AMTCX Dual Monostable Multivibrator with 2-5.5V Operation 5.5V-Tolerant Inputs 25mA Output Drive <10ns Pulse Width Reset Function Low Power Consumption and TSSOP-16 Package

Features

■ High Speed: t PD = 8.1ns (Typ.) at V CC = 5V

■ Low Power Dissipation: I CC = 4µA (Max.) at T A = 25°C

■ Active State: I CC = 600µA (Max.) at T A = 25°C

■ High Noise Immunity: V NIH = V NIL = 28% V CC (Min.)

■ Power down protection is provided on all inputs

■ Pin and function compatible with 74HC221A

Applications

1. Precision Timing & Pulse Control
With <10ns pulse width accuracy and reset function, it is suitable for scenarios requiring precise timing control:

• Industrial automation machinery action sequencing (e.g., robotic arm synchronization)

• Pulse generation and time measurement circuits in laser ranging systems

• Trigger signal generation for medical equipment (e.g., ultrasound devices)

2. Communication & Digital Signal Processing
25mA high output drive capability and 5.5V tolerant inputs support medium-to-high-speed signal conditioning:

• Clock recovery and signal reshaping in fiber optic communication equipment

• Frame synchronization pulse generation in network switches

• Analog signal sample-and-hold control in data acquisition systems

3. Automotive Electronics & Harsh Environment Applications
2-5.5V wide operating voltage range and strong anti-interference capability (note: requires parameter confirmation) make it suitable for:

• Signal delay processing in automotive radar systems

• Fault detection pulse generation in Engine Control Units (ECUs)

• Fault protection delay circuits in Battery Management Systems (BMS)

4. Consumer Electronics & Power Management
Low power consumption and compact TSSOP-16 package meet portable device requirements:

• PWM signal generation in drone flight control systems

• Backlight control pulse modulation in smartwatches

• Overcurrent protection delay triggering in fast-charging devices

Description

The VHC221A is an advanced high speed CMOS Monostable Multivibrator fabricated with silicon gate CMOS technology. It achieves the high speed operation similar to equivalent Bipolar Schottky TTL while main taining the CMOS low power dissipation. Each multi vibrator features both a negative, A, and a positive, B, transition triggered input, either of which can be used as an inhibit input. Also included is a clear input that when taken LOW resets the one-shot. The VHC221A can be triggered on the positive transition of the clear while A is held LOW and B is held HIGH. The VHC221A is non retriggerable, and therefore cannot be retriggered until the output pulse times out. The output pulse width is determined by the equation:

PW = (Rx)(Cx)

where,

PW is in seconds, R is in ohms, and C is in farads.

Limits for R x and C x are:

External capacitor, C x : No limit

External resistors, R x : V CC = 2.0V, 5k Ω Min.

                                      V CC > 3.0V, 1 k Ω Min

INFORMATION

Drawing

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