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STMicroelectronics M74HC221RM13TR
- Part No.:
- M74HC221RM13TR
- Manufacturer:
- STMicroelectronics
- Category:
- Multivibrators
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
M74HC221RM13TR.pdf
- Description:
- IC MULTIVIBRATOR 24NS 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,798
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Product details
Overview
M74HC221RM13TR from STMicroelectronics is a dual high-speed CMOS monostable multivibrator with independent negative-edge (A) and positive-edge (B) trigger inputs per channel, 2V–6V supply range, 24 ns typical propagation delay at 6V, and external RC-timed output pulse width from 150 ns to 60 s. It operates in industrial temperature range (−55°C to +125°C) and supports retriggerable monostable operation for precision timing in digital control systems.
For engineers reviewing the M74HC221RM13TR datasheet, M74HC221RM13TR pinout, M74HC221RM13TR application, or M74HC221RM13TR equivalent, key selection criteria include dual independent monostable timing, Schmitt-triggered CLR input, active-low/high complementary outputs per channel, and TSSOP-16 package compatibility with high-density PCB layouts.
Technical Context
The M74HC221RM13TR implements two independent monostable circuits, each using internal comparators (VREFH/VREFL), a flip-flop, and transistor discharge path to generate precise RC-determined output pulses. Triggering supports three modes: A↓+B↑, A↑+B↓, or CLR↑ - all validated via Schmitt-trigger inputs for noise immunity.
Each channel features complementary active-high (Q) and active-low (Q̅) outputs, dual external RC networks (pins 5/6/7 and 13/14/15), and reset-controlled discharge/charge of Cx via internal transistors. Standby ICC is ≤4 µA at 25°C; active ICC peaks at 1.7 mA at 6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 6 V - enables direct interface with 3.3 V and 5 V logic families without level shifters |
| tPD (Typ.) | 24 ns at VCC = 6 V - ensures sub-42 ns worst-case delay for high-speed digital timing applications |
| tWOUT Range | 150 ns to 60 s at VCC = 4.5 V - supports both nanosecond glitch suppression and second-scale event timing |
| IOH/IOL | ±4 mA min - drives standard TTL/CMOS loads without external buffers |
| VNIH/VNIL | 28 % VCC min - provides robust noise margin against EMI in noisy industrial environments |
| Operating Temp | −55 °C to +125 °C - qualified for under-hood automotive and industrial control applications |
| ICC (Standby) | 4 µA max at TA = 25 °C - enables ultra-low-power sleep-mode timing in battery-backed systems |
Pinout & Package
TSSOP-16 package (5.0 mm × 4.4 mm, 0.65 mm pitch), thin-profile surface-mount design optimized for automated assembly and thermal performance in compact layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 9 | 1A, 2A - Negative-edge trigger inputs | Asynchronous edge-sensitive inputs; require falling transition to initiate monostable period |
| 2, 10 | 1B, 2B - Positive-edge trigger inputs | Edge-triggered with Schmitt threshold; insensitive to slow rise/fall times |
| 3, 11 | 1CLR, 2CLR - Direct reset inputs | Active-high asynchronous reset; forces Q low and rapidly charges Cx to VCC |
| 4, 12 | 1Q, 2Q - Active-low outputs | Complementary to Q pins; used for inverted logic timing or NAND-based gating |
| 5, 13 | 1Q̅, 2Q̅ - Active-high outputs | Primary timing outputs; drive downstream logic directly with rail-to-rail swing |
| 6, 14 | 1CX, 2CX - External capacitor connections | Connects to timing capacitor; polarity-insensitive; requires ≥100 pF minimum |
| 7, 15 | 1RX/CX, 2RX/CX - Shared resistor/capacitor node | Discharge path for Cx during monostable period; sets pulse width via Rx·Cx product |
| 8 | GND | Logic and power ground reference; must be low-impedance for stable timing |
| 16 | VCC | Positive supply; decoupling capacitor (100 nF) required within 5 mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| Retriggerable monostable operation | Extends output pulse width on successive triggers - ideal for missing-pulse detection and variable-width gate generation |
| Independent dual channels | Enables concurrent timing functions (e.g., PWM dead-time + fault timeout) without cross-talk or shared RC constraints |
| Schmitt-triggered CLR input | Eliminates false triggering from noisy reset lines; guarantees clean state recovery even with slow-rising signals |
| Complementary Q/Q̅ outputs per channel | Reduces external inverters in latch-based or RS-flip-flop interfacing; supports both active-high and active-low system logic |
| Wide Rx/Cx operating range | Supports 1 kΩ–1 MΩ resistors and >100 pF capacitors - accommodates ceramic, film, and electrolytic timing components |
Applications
| Pulse Width Modulation Control | Glitch Filtering & Debouncing |
|---|---|
Use Scenario: Generating precise dead-time intervals between high-side and low-side MOSFET gate drivers in half-bridge inverters. IC Role / Device Role / Timing Role: Dual-channel monostable provides independent, retriggerable delays for upper/lower switch turn-off timing. Use Value: Ensures >150 ns guaranteed non-overlap between drive signals, preventing shoot-through current in motor drives. | Use Scenario: Removing mechanical contact bounce from pushbutton or limit-switch inputs in PLC I/O modules. IC Role / Device Role / Timing Role: Single-shot pulse generator triggered by switch closure; output holds clean logic level for microcontroller sampling. Use Value: Eliminates need for software debouncing loops; reduces MCU interrupt load and improves real-time response. |
| Fault Timeout Monitoring | Serial Data Pulse Stretching |
Use Scenario: Detecting loss-of-signal conditions in CAN or RS-485 transceivers by monitoring data activity windows. IC Role / Device Role / Timing Role: Monostable triggered by each received edge; output stays high until next edge arrives within timeout window. Use Value: Generates hardware-level fault flag (e.g., 100 ms timeout) without CPU intervention - critical for safety-critical comms layers. | Use Scenario: Converting narrow UART start bits or I²C clock pulses into wider, easily captured strobes for FPGA logic analyzers. IC Role / Device Role / Timing Role: One-shot stretches short asynchronous pulses to ≥500 ns duration for reliable synchronous sampling. Use Value: Enables deterministic capture of transient serial events using low-frequency clock domains in test instrumentation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual monostable multivibrator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC221DR | SOIC-16 package; identical AC/DC specs but higher 1.2 mm profile and 6.2 mm width | Limited board space efficiency vs. TSSOP; less suitable for high-density routing | Select when legacy SOIC footprint compatibility or hand-soldering is required |
| 74LVC221APW | 3.3 V only (1.65–3.6 V); lower 3.5 ns tPD; no 6 V operation or −55°C rating | Not usable in mixed-voltage or extended-temperature industrial designs | Select only for 3.3 V-only, high-speed consumer-grade timing where cost is primary |
Compared with SN74HC221DR and 74LVC221APW, the M74HC221RM13TR uniquely combines wide 2–6 V operation, industrial temperature range, and TSSOP-16 footprint - making it the only choice for space-constrained, multi-rail, and harsh-environment timing applications.
Availability
M74HC221RM13TR is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, programmable logic interface design, and medical diagnostic equipment requiring stable component supply across extended temperature and voltage ranges.
Supply support for M74HC221RM13TR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
The M74HC221RM13TR belongs to ST's high-reliability HC logic family, engineered for robust timing accuracy, low-power standby operation, and seamless integration into noise-prone industrial control systems.
FAQ
What is the minimum external capacitor value supported for stable timing?
The datasheet specifies Cx ≥ 100 pF for reliable operation across temperature and voltage. Below this value, propagation delay variation increases significantly due to input capacitance dominance and comparator threshold sensitivity. Ceramic NP0/C0G types are recommended for stability; X7R may introduce ±5% timing drift over temperature.
Can the M74HC221RM13TR operate with a 3.3 V supply while maintaining full specification?
Yes - at VCC = 3.3 V, all DC parameters (VIH/VIL, VOH/VOL, ICC) and AC timing (tPD, tWOUT) remain fully specified per datasheet Tables 5–7. Propagation delay is ~38 ns typ., and output pulse width error remains within ±1% between channels, enabling drop-in use in 3.3 V systems without derating.
How does retriggering affect the output pulse width?
When a new trigger occurs during an active monostable period, the output pulse width extends by the full RC time constant (0.7·Rx·Cx) from the retrigger instant - not from the original start. This behavior is inherent to the internal discharge/recharge architecture and is confirmed in the functional description on page 4 of the datasheet.
Is the TSSOP-16 package RoHS-compliant and lead-free?
Yes - the M74HC221RM13TR uses STMicroelectronics' standard RoHS-compliant, lead-free TSSOP-16 package (MECHANICAL DATA c E b A2 A E1 D 1 PIN 1 IDENTIFICATION A1 L K e 0080338D). It meets JEDEC J-STD-020 moisture sensitivity level MSL3 and supports standard Pb-free reflow profiles up to 260°C peak.
M74HC221RM13TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74HC
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Monostable
- Independent Circuits:
- 2
- Schmitt Trigger Input:
- Yes
- Propagation Delay:
- 24 ns
- Current - Output High, Low:
- 5.2mA, 5.2mA
- Voltage - Supply:
- 2 V ~ 6 V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
M74HC221RM13TR FAQ
1.How can I place an order for M74HC221RM13TR through Aetrix?
Please submit a Request for Quotation (RFQ) for M74HC221RM13TR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for M74HC221RM13TR reliable?
The price and inventory of M74HC221RM13TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M74HC221RM13TR is usually 5 days.
3.What payment methods are accepted for M74HC221RM13TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M74HC221RM13TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M74HC221RM13TR?
M74HC221RM13TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M74HC221RM13TR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for M74HC221RM13TR?
For technical support, including M74HC221RM13TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M74HC221RM13TR requirements.
6.How does Aetrix verify that M74HC221RM13TR is sourced from the original manufacturer or authorized distributors?
All M74HC221RM13TR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that M74HC221RM13TR meets industry standards.
7.What is the process for return or replacement of M74HC221RM13TR?
All M74HC221RM13TR units undergo pre-shipment inspection (PSI). If there is an issue with M74HC221RM13TR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The M74HC221RM13TR part is unused and in its original packaging.
Return procedure for M74HC221RM13TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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