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Texas Instruments SN74LV221AQPWRQ1
- Part No.:
- SN74LV221AQPWRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Multivibrators
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LV221AQPWRQ1.pdf
- Description:
- IC MULTIVIBRATOR 13.2NS 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:871
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Product details
Overview
SN74LV221AQPWRQ1 from Texas Instruments is a dual monostable multivibrator with Schmitt-trigger inputs, designed for automotive applications (–40°C to 125°C), operating from 2 V to 5.5 V VCC, and featuring programmable output pulse duration via external R/C networks. It supports mixed-mode voltage operation, includes glitch-free power-up reset, and provides overriding clear functionality for pulse termination.
For engineers reviewing the SN74LV221AQPWRQ1 datasheet, SN74LV221AQPWRQ1 pinout, SN74LV221AQPWRQ1 application, or SN74LV221AQPWRQ1 equivalent, key selection considerations include its dual independent monostable architecture, ±1% pulse-duration variation across circuits, Schmitt-trigger input hysteresis for slow-edge immunity, and Ioff support for partial-power-down mode in automotive ECUs and timing-critical control systems.
Technical Context
This device implements two independent edge-triggered monostables, each with separate negative-transition (A) and positive-transition (B) inputs plus a high-active clear (CLR). Pulse initiation occurs via three valid trigger combinations - A↓/B↑, A↑/B↓, or A↓/B↑/CLR↑ - enabling flexible timing control in noise-prone environments.
Output pulse width (tw) is determined by external Rext and Cext components connected between pins Rext/Cext and VCC, and between Cext and Rext/Cext respectively. The timing constant K varies with Cext value (K = 1.0 for CT ≥ 1000 pF), and tw exhibits < ±0.5% unit-to-unit variation under matched external component conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - enables direct interface with 2.5 V, 3.3 V, and 5 V logic domains without level shifters. |
| Operating Temperature | –40°C to 125°C - qualified per AEC-Q100 for under-hood automotive use. |
| Output Pulse Duration | Programmable from ~1 ns to >1 ms - set by external Rext (1 kΩ to 5 kΩ typical) and Cext (1 pF to 100 nF). |
| Pulse Variation | ±1% Δtw across circuits in same package - ensures matched timing behavior in dual-channel applications. |
| Input Hysteresis | Schmitt-trigger on A, B, CLR - rejects noise and accommodates slow input transitions without false triggering. |
| Ioff Support | Active at VCC = 0 V - prevents backflow current during partial power-down, critical for hot-swap and low-power sleep modes. |
| Propagation Delay | 7 ns min (VCC = 5 V) - ensures fast response to trigger events in real-time control loops. |
Pinout & Package
TSSOP-16 (PW) package, 4.4 mm × 5.0 mm body, 0.65 mm pitch, 1.2 mm max height, RoHS-compliant, NIPDAU lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A, 2A | Negative-edge trigger input | Triggers monostable on falling edge; Schmitt-triggered for noise immunity. |
| 1B, 2B | Positive-edge trigger input | Triggers monostable on rising edge; Schmitt-triggered for noise immunity. |
| 1CLR, 2CLR | Asynchronous clear input | High-active override terminates output pulse immediately; resets Q to low, Q̅ to high. |
| 1Q, 2Q | In-phase output | Active-high pulse output; TTL-compatible rise/fall times independent of pulse width. |
| 1Q̅, 2Q̅ | Complementary output | Active-low pulse output; synchronized with Q but inverted; used for differential timing or latch enable. |
| 1Cext, 2Cext | Timing capacitor connection | Connects external timing capacitor (CT) between Cext and Rext/Cext pins. |
| 1Rext/Cext, 2Rext/Cext | Shared timing node | Common terminal for Rext resistor (to VCC) and Cext capacitor (to Cext); defines RC time constant. |
| VCC | Supply voltage | 2 V to 5.5 V power rail; powers both monostables and internal Schmitt triggers. |
| GND | Ground reference | Return path for all internal circuitry and external timing components. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent monostables | Enables two synchronized or isolated timing functions in one 16-pin TSSOP, reducing board space vs discrete solutions. |
| Schmitt-trigger inputs (A/B/CLR) | Provides ≥0.3×VCC hysteresis, eliminating chatter on slow-rising/falling signals common in sensor interfaces and switch debouncing. |
| Three trigger modes per channel | Supports A↓/B↑, A↑/B↓, or A↓/B↑/CLR↑ configurations - allows flexible integration into existing control logic without added gates. |
| Glitch-free power-up reset | Guarantees Q = low, Q̅ = high at power-on without external reset circuitry - simplifies startup sequencing in automotive modules. |
| Ioff partial-power-down protection | Disables outputs when VCC = 0 V, preventing current backflow from live buses into unpowered sections - essential for domain-isolated vehicle networks. |
Applications
| Engine Control Unit Timing | ADAS Sensor Pulse Conditioning |
|---|---|
Use Scenario: Generating precise, jitter-free delay pulses for fuel injector firing or ignition coil activation based on crankshaft position sensor edges. IC Role / Device Role / Timing Role: Dual monostable acts as programmable edge detector and pulse stretcher, converting narrow sensor pulses into stable, width-controlled drive signals. Use Value: Enables deterministic timing margins (±1% pulse match) across dual channels, critical for cylinder-balance calibration and misfire detection. | Use Scenario: Conditioning noisy radar or ultrasonic sensor echo pulses before feeding to microcontroller capture timers. IC Role / Device Role / Timing Role: Schmitt-trigger inputs clean slow-rising analog-derived pulses; programmable tw filters out false echoes while preserving true target returns. Use Value: Eliminates need for external RC + comparator stages, reducing BOM count and improving temperature stability of pulse width thresholds. |
| Automotive Body Controller Debounce | Infotainment System Power Sequencing |
Use Scenario: Debouncing mechanical switch inputs (door locks, seat controls) in 12 V battery-powered body control modules. IC Role / Device Role / Timing Role: Each monostable converts contact bounce into single clean pulse; CLR allows software-initiated reset for dynamic timeout adjustment. Use Value: Supports wide VCC range (2–5.5 V) to operate directly from LDO outputs, avoiding additional level-shifting circuitry. | Use Scenario: Controlling power-up sequence of display driver, audio codec, and MCU subsystems in head unit designs. IC Role / Device Role / Timing Role: One monostable generates fixed delay for primary rail enable; second provides adjustable delay (via variable Rext) for secondary rail coordination. Use Value: Ioff support allows safe insertion/removal of submodules while main system remains powered - simplifies field-serviceable infotainment architectures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual monostable multivibrator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AHC123APWR | Non-automotive grade (–40°C to 85°C), no AEC-Q100 qualification; identical pinout and function but lacks Ioff and tighter pulse variation spec. | Suitable for industrial or consumer timing where extended temperature and automotive reliability are not required. | Select when cost sensitivity outweighs automotive qualification needs and thermal range is limited to commercial/industrial. |
| SN74LV123APWR | Same LV family, automotive-qualified variant, but uses standard (non-Schmitt) inputs - requires external hysteresis for slow-edge immunity. | Applicable where input signal slew rates are controlled and external filtering is acceptable. | Choose only if system-level noise immunity is managed externally and Schmitt-triggering is redundant. |
Compared with SN74AHC123APWR and SN74LV123APWR, the SN74LV221AQPWRQ1 delivers guaranteed automotive qualification, integrated Schmitt inputs eliminating external hysteresis components, and superior pulse-width matching (±1% vs typical ±5%), making it the sole choice for safety-critical timing in engine and ADAS domains.
Availability
SN74LV221AQPWRQ1 is available at Aetrix Electronics and suitable for automotive ECU design, ADAS sensor interface development, and body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LV221AQPWRQ1 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 company specializing in analog, embedded processing, and automotive-grade ICs, with leadership in high-reliability timing and interface solutions.
The SN74LV221A-Q1 belongs to TI's LV logic family optimized for low-voltage, high-noise-immunity automotive applications, designed specifically to replace legacy 74-series multivibrators in next-generation vehicle control modules.
FAQ
What is the minimum external timing capacitance supported by SN74LV221AQPWRQ1?
The SN74LV221AQPWRQ1 supports external timing capacitance down to 1 pF, as confirmed in the Switching Characteristics table (Cext = 0.1 pF tested at 0.9–1.1 ms pulse width). Operation below 1 pF is not characterized, and values < 1000 pF require use of the K-factor correction curve from Figure 7 to calculate accurate pulse duration.
Does SN74LV221AQPWRQ1 support retriggering during an active output pulse?
No, the SN74LV221AQPWRQ1 does not support retriggering. Once triggered, outputs are independent of further A/B input transitions until the pulse completes or is terminated by CLR. This non-retriggerable behavior is explicitly stated in the Functional Description and distinguishes it from devices like SN74AHC123A.
How does the Ioff feature of SN74LV221AQPWRQ1 protect downstream circuitry?
The Ioff feature in SN74LV221AQPWRQ1 disables all outputs when VCC = 0 V, preventing current backflow from live signal lines (e.g., 3.3 V data buses) into the unpowered IC. This avoids damaging latch-up or unintended biasing of adjacent powered components during partial-power-down sequences in automotive domain controllers.
Can SN74LV221AQPWRQ1 be used with 1.8 V logic inputs?
No, SN74LV221AQPWRQ1 is not guaranteed to operate with 1.8 V inputs. Its VIH(min) is VCC × 0.7 (e.g., 1.4 V at VCC = 2 V), but the absolute minimum VCC is 2 V. Inputs must remain within 0 V to VCC, and 1.8 V signals applied while VCC = 2 V fall outside recommended VIH/VIL ranges and risk unreliable triggering or increased ICC.
What is the maximum recommended value for Rext in SN74LV221AQPWRQ1 timing networks?
The datasheet specifies Rext ≥ 1 kΩ for VCC ≥ 3 V and no upper limit, but practical maximum is constrained by leakage and noise. At VCC = 5 V, Rext > 10 MΩ causes measurable drift due to input leakage (±1 μA), limiting usable range to ≤ 1 MΩ for stable sub-microsecond timing. Figure 3 shows RT = 1 MΩ curves up to 10⁷ ns, confirming viability within that bound.
SN74LV221AQPWRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LV
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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 ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
SN74LV221AQPWRQ1 FAQ
1.How can I place an order for SN74LV221AQPWRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LV221AQPWRQ1 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 SN74LV221AQPWRQ1 reliable?
The price and inventory of SN74LV221AQPWRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV221AQPWRQ1 is usually 5 days.
3.What payment methods are accepted for SN74LV221AQPWRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LV221AQPWRQ1 transactions.
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4.How is shipping managed for SN74LV221AQPWRQ1?
SN74LV221AQPWRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LV221AQPWRQ1 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 SN74LV221AQPWRQ1?
For technical support, including SN74LV221AQPWRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV221AQPWRQ1 requirements.
6.How does Aetrix verify that SN74LV221AQPWRQ1 is sourced from the original manufacturer or authorized distributors?
All SN74LV221AQPWRQ1 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 SN74LV221AQPWRQ1 meets industry standards.
7.What is the process for return or replacement of SN74LV221AQPWRQ1?
All SN74LV221AQPWRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV221AQPWRQ1, 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 SN74LV221AQPWRQ1 part is unused and in its original packaging.
Return procedure for SN74LV221AQPWRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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