My Inquiry
My Account
Texas Instruments SN74LV221APW
- Part No.:
- SN74LV221APW
- Manufacturer:
- Texas Instruments
- Category:
- Multivibrators
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LV221APW.pdf
- Description:
- IC MULTIVIBRATOR 13.2NS 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:363
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74LV221APW from Texas Instruments is a dual monostable multivibrator IC with Schmitt-trigger inputs, designed for 2V–5.5V operation, 11ns max propagation delay at 5V, and programmable pulse duration via external R/C networks. It serves as a precision timing generator in digital control circuits requiring edge-triggered one-shot pulses with glitch-free power-up reset.
For engineers reviewing the SN74LV221APW datasheet, SN74LV221APW pinout, SN74LV221APW application, or SN74LV221APW equivalent, key selection considerations include its dual-channel independent triggering (A/B inputs), overriding clear functionality, Ioff partial-power-down support, and TSSOP-16 package compatibility with legacy 'AHC123A/'AHCT123A layouts.
Technical Context
The SN74LV221APW implements two independent edge-triggered monostable multivibrators, each accepting negative-edge (A) and positive-edge (B) triggers with Schmitt-trigger input hysteresis to reject slow transitions. Pulse width is externally set by Rext and Cext connected to dedicated pins per channel, enabling adjustable durations from nanoseconds to milliseconds.
Each channel supports three trigger modes: A low + B rising, B high + A falling, or simultaneous A low/B high + CLR rising. The overriding clear (CLR) input terminates output pulses early and ensures deterministic power-up states (Q = L, Q̅ = H) without external reset circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 5.5V - Enables mixed-voltage system interfacing and direct connection to 2.5V, 3.3V, or 5V logic rails. |
| Max tpd @ 5V | 11ns - Guarantees fast response for time-critical pulse generation in high-speed digital control loops. |
| Output Pulse Range | ~100ns to >1ms - Programmable via external R/C components (e.g., 2kΩ/28pF → 200ns; 10kΩ/0.1µF → 1ms). |
| Ioff Support | Yes - Prevents backflow current during partial power-down, critical for hot-swap and low-power standby modes. |
| Operating Temp | −40°C to +85°C - Validated for industrial-grade embedded systems and automotive body electronics. |
| ESD Rating (HBM) | ±2000V - Meets JEDEC JS-001 for robust handling in manufacturing and field deployment. |
| Quiescent ICC | 20µA @ 5.5V - Minimizes static power draw in battery-backed or always-on timing applications. |
Pinout & Package
TSSOP-16 (PW) package: 5.00mm × 6.4mm body size, 0.65mm lead pitch, surface-mount, RoHS-compliant, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 9 (1A, 2A) | Falling-edge trigger input | Active-low transition initiates pulse when corresponding B input is high; Schmitt-triggered for noise immunity. |
| 2, 10 (1B, 2B) | Rising-edge trigger input | Active-high transition initiates pulse when corresponding A input is low; hysteresis prevents chatter on slow edges. |
| 3, 11 (1CLR, 2CLR) | Overriding clear input | Asynchronous high-level signal resets output mid-pulse; can shorten programmed duration or force initial state. |
| 4, 12 (1Q, 2Q) | Inverted output | Complementary to non-inverted output; provides active-low timing signal for enable/disable functions. |
| 5, 13 (2Q, 1Q) | Non-inverted output | Primary timing output; pulse width matches Rext/Cext time constant; TTL-compatible rise/fall times. |
| 6, 14 (2Cext, 1Cext) | Capacitor negative terminal | Connects external timing capacitor ground side; referenced to GND, not VCC or internal node. |
| 7, 15 (2Rext/Cext, 1Rext/Cext) | R/C junction node | Shared connection point for timing resistor (to VCC) and capacitor (to Cext pin); defines RC time constant. |
| 8 (GND) | Ground reference | Primary return path for all internal logic and timing currents; must be low-impedance for stable pulse width. |
| 16 (VCC) | Power supply | Supplies core logic and output drivers; requires local 0.1µF bypass capacitor per TI layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Schmitt-trigger inputs on A, B, CLR | Enables reliable triggering from slow-rising signals (e.g., mechanical switch debouncing, sensor outputs) without external conditioning. |
| Glitch-free power-up reset | Guarantees Q = L and Q̅ = H at power-on without external RC reset network - reduces BOM count and board space. |
| Overriding clear functionality | Allows dynamic pulse termination during active timing, supporting adaptive timeout control in communication or safety circuits. |
| Pin-compatible with 'AHC123A/'AHCT123A | Permits drop-in replacement in existing designs using those families, provided retrigger behavior is not required. |
| Ioff partial-power-down protection | Blocks current flow between powered and unpowered sections of a system, preventing latch-up or damage during hot insertion. |
Applications
| Industrial Motor Control | Digital Power Sequencing |
|---|---|
Use Scenario: Generating precise enable delays for gate drivers in multi-phase inverters to prevent shoot-through during startup. IC Role / Device Role / Timing Role: Dual-channel monostable providing independent, jitter-free turn-on delays for upper/lower MOSFET pairs. Use Value: Eliminates need for discrete RC timers or microcontroller-based timing, reducing firmware complexity and improving deterministic latency. | Use Scenario: Controlling power-up sequence of FPGA, memory, and analog subsystems in telecom baseband cards. IC Role / Device Role / Timing Role: One-shot generator producing staggered reset/assert signals with user-defined intervals (e.g., 100µs, 1ms). Use Value: Ensures strict voltage-rail sequencing compliance without software intervention or additional supervisor ICs. |
| Automotive Body Electronics | Test & Measurement Equipment |
Use Scenario: Debouncing door lock/unlock switch inputs while generating fixed-duration actuator drive pulses. IC Role / Device Role / Timing Role: Edge-triggered pulse stretcher converting noisy mechanical switch closures into clean, consistent 200ms output pulses. Use Value: Replaces multiple passive components and logic gates, improving reliability and reducing PCB area in space-constrained modules. | Use Scenario: Creating calibrated trigger windows for oscilloscope auxiliary outputs or logic analyzer synchronization. IC Role / Device Role / Timing Role: Precision programmable delay generator with sub-10ns jitter and temperature-stable pulse width (±0.5% typical unit-to-unit variation). Use Value: Delivers repeatable timing accuracy across environmental conditions, avoiding calibration drift seen in RC-based alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar monostable multivibrator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AHC123AD | Higher VCC range (2–5.5V same), but no Schmitt-trigger inputs; 7.5ns tpd @ 5V; no Ioff support. | Lacks built-in noise immunity for slow inputs; unsuitable for direct switch interfacing without external hysteresis. | Choose when speed is prioritized over input robustness and partial-power-down capability. |
| MC74LVX221DT | Same function, 3.3V-only operation (2.7–3.6V); 10ns tpd @ 3.3V; different pinout (SOIC-16 only); no TSSOP option. | Not pin-compatible; requires PCB redesign; limited to 3.3V systems without level-shifting. | Select only for 3.3V-only designs where footprint change is acceptable and Schmitt inputs are not needed. |
Compared with SN74AHC123AD and MC74LVX221DT, the SN74LV221APW uniquely combines wide-supply operation, Schmitt-trigger noise immunity, Ioff protection, and TSSOP-16 packaging - making it the only choice for industrial or automotive applications demanding robustness, flexibility, and layout compatibility.
Availability
SN74LV221APW is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, digital power sequencing, and test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LV221APW 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
Texas Instruments is a global semiconductor leader delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The SN74LV221APW belongs to TI's LV family of low-voltage logic devices, engineered for interoperability across mixed-voltage systems and optimized for noise-immune timing functions in harsh environments.
FAQ
What is the maximum operating frequency or minimum pulse width supported by the SN74LV221APW?
The SN74LV221APW does not operate at a fixed clock frequency; instead, it generates single-shot pulses with programmable width. Minimum pulse width is ~100ns (e.g., with 2kΩ/28pF at 5V). Shorter widths are not guaranteed due to internal propagation delays and timing resolution limits. For sub-100ns timing, consider dedicated high-speed timers or FPGA-based solutions.
Can the SN74LV221APW be used with 2.5V logic levels while interfacing to a 5V microcontroller?
Yes, the SN74LV221APW supports mixed-mode voltage operation: its inputs accept 0–5.5V signals regardless of VCC, and outputs swing rail-to-rail (0V to VCC). When powered at 2.5V, it safely accepts 5V inputs and drives 2.5V-compatible loads - ideal for bridging 5V MCU GPIOs to low-voltage peripherals without level shifters.
Does the SN74LV221APW support retriggering during an active output pulse?
No, the SN74LV221APW does not support retriggering. Once triggered, the output pulse duration is determined solely by the external R/C network and cannot be extended or restarted by subsequent input edges. This non-retriggerable behavior distinguishes it from the 'AHC123A and makes it suitable for applications requiring fixed, isolated timing events.
How does the overriding clear (CLR) input affect the output state of the SN74LV221APW?
Driving CLR low during an active output pulse forces both Q and Q̅ outputs to their reset states (Q = L, Q̅ = H) immediately, terminating the pulse prematurely. When CLR returns high, the device remains in reset until the next valid trigger event - ensuring deterministic control over pulse duration independent of R/C values.
Is the SN74LV221APW pinout identical to the SN74LV221ADR (SOIC-16) version?
Yes, the SN74LV221APW (TSSOP-16) shares identical pin numbering and function mapping with the SN74LV221ADR (SOIC-16) and all other package variants (D, DB, DGV, NS). This allows direct PCB footprint substitution between packages, provided thermal and layout constraints (e.g., soldering profile, trace impedance) are verified for the TSSOP variant.
SN74LV221APW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LV
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Logic Type:
- Monostable
- Independent Circuits:
- 2
- Schmitt Trigger Input:
- Yes
- Propagation Delay:
- 13.2 ns
- Current - Output High, Low:
- 12mA, 12mA
- Voltage - Supply:
- 2 V ~ 5.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
SN74LV221APW FAQ
1.How can I place an order for SN74LV221APW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LV221APW 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 SN74LV221APW reliable?
The price and inventory of SN74LV221APW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV221APW is usually 5 days.
3.What payment methods are accepted for SN74LV221APW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LV221APW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LV221APW?
SN74LV221APW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LV221APW 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 SN74LV221APW?
For technical support, including SN74LV221APW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV221APW requirements.
6.How does Aetrix verify that SN74LV221APW is sourced from the original manufacturer or authorized distributors?
All SN74LV221APW 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 SN74LV221APW meets industry standards.
7.What is the process for return or replacement of SN74LV221APW?
All SN74LV221APW units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV221APW, 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 SN74LV221APW part is unused and in its original packaging.
Return procedure for SN74LV221APW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74LV221APW Tags
-
SN74LVC1G123DCUR
Texas Instruments
-
CD4047BM96
Texas Instruments
-
SN74LVC1G123DCTR
Texas Instruments
-
CD74HC221M96
Texas Instruments
-
CD14538BE
Texas Instruments
-
SN74LVC1G123YZPR
Texas Instruments
-
SN74LVC1G123DCUT
Texas Instruments
-
MC14538BDR2G
onsemi
-
74VHC123AMX
onsemi
-
LTC6993CS6-2#TRMPBF
Analog Devices Inc.
-
LTC6993CS6-3#TRMPBF
Analog Devices Inc.
-
LTC6993CS6-1#TRMPBF
Analog Devices Inc.
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
