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Texas Instruments SN74LVC821PWLE
- Part No.:
- SN74LVC821PWLE
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- -
- Datasheet:
-
SN74LVC821PWLE.pdf
- Description:
- IC FF D-TYPE SNGL 10BIT 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:6,000
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Product details
Overview
SN74LVC821PWLE from Texas Instruments is a 10-bit bus-interface D-type flip-flop with 3-state outputs, designed for 1.65 V to 3.6 V operation. It features edge-triggered clocking on the positive CLK transition, buffered output-enable (OE) control, and mixed-mode I/O compatibility-accepting 5.5 V inputs while operating at 3.3 V VCC. It is used in bidirectional bus drivers with parity and wide buffer register implementations.
For engineers reviewing the SN74LVC821PWLE datasheet, SN74LVC821PWLE pinout, SN74LVC821PWLE application, or SN74LVC821PWLE equivalent, key selection considerations include its 24-pin TSSOP package, 7.3 ns max propagation delay at 3.3 V, Ioff partial-power-down support, 3.6 V absolute maximum supply rating, and true 10-bit synchronous latch behavior with independent OE control.
Technical Context
This device implements ten identical edge-triggered D-type flip-flops sharing a common clock (CLK) and output-enable (OE) signal. Each flip-flop captures data on the rising edge of CLK and presents it at the corresponding Q output, while OE independently places all ten outputs into high-impedance state without affecting internal storage.
Its Ioff circuitry disables outputs during power-down to prevent backflow current, and input tolerance up to 5.5 V enables use as a level translator between 3.3-V and 5-V domains. The design supports highly capacitive bus loading via strong drive capability (±24 mA at 3 V) and low ground bounce (<0.8 V typical VOLP).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - Enables direct integration into modern low-voltage logic systems including 1.8-V, 2.5-V, and 3.3-V domains. |
| Max tpd | 7.3 ns at VCC = 3.3 V - Supports reliable operation up to 150 MHz clock frequency in high-speed bus interfaces. |
| Ioff Support | Yes - Prevents damaging current flow when VCC = 0 V, enabling safe hot-insertion and partial-power-down system architectures. |
| Input Voltage Tolerance | Up to 5.5 V - Allows interfacing with legacy 5-V logic without external level shifters. |
| Output Drive | ±24 mA at VCC = 3 V - Sufficient to drive heavily loaded PCB traces or multiple CMOS inputs without buffering. |
| 3-State Enable Delay | 6.2 ns max tdis - Ensures fast bus release for time-critical shared-bus arbitration. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial ambient environments without derating. |
Pinout & Package
TSSOP-24 (PW) package: 7.8 mm × 4.4 mm body, 0.65 mm pitch, 1.2 mm max height, JEDEC MO-153 compliant, RoHS-compliant green finish (Pb-free, no Sb/Br).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 | Data Inputs (1D–10D) | Asynchronous parallel data inputs feeding respective D-type latches; accept 0–5.5 V regardless of VCC. |
| 11 | Output Enable (OE) | Active-low control: drives all Q outputs to high-impedance when high; does not affect internal latch state. |
| 12 | GND | Power return reference for all logic and I/O circuits; must be low-inductance connection for noise immunity. |
| 13 | VCC | Primary supply rail (1.65–3.6 V); powers internal logic and output drivers; bypassing required per TI layout guidelines. |
| 14, 15, 16, 17, 18, 19, 20, 21, 22, 23 | Outputs (1Q–10Q) | True (non-inverted) latched outputs; each capable of sourcing/sinking ±24 mA in active state; high-Z when OE = high. |
| 24 | CLK | Global positive-edge clock input; synchronizes capture of all ten D inputs simultaneously into respective Q outputs. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode I/O | 5.5-V-tolerant inputs enable interoperability between 3.3-V logic and legacy 5-V peripherals without external translators. |
| Ioff protection | Prevents current backflow during power sequencing or partial shutdown, meeting JESD78 Class II latch-up robustness (>250 mA). |
| Low ground bounce | Typical VOLP < 0.8 V at VCC = 3.3 V ensures stable logic-low levels under heavy capacitive switching loads. |
| Fast enable/disable | 6.2 ns max tdis and 7.6 ns max ten allow rapid bus turnaround in time-multiplexed memory or peripheral interfaces. |
| Small-footprint packaging | TSSOP-24 reduces board area by ~40% vs SOIC-24 while maintaining full 10-bit bus-width capability. |
Applications
| Industrial PLC Backplane Interface | Automotive Body Control Module Bus Buffer |
|---|---|
Use Scenario: Isolating and latching sensor data across a noisy 24-V industrial backplane using isolated 3.3-V microcontroller I/O. IC Role / Device Role / Timing Role: 10-bit synchronous latch providing noise-immune data staging between field-side ADCs and controller-side SPI interface. Use Value: Ioff and 5.5-V input tolerance eliminate level-shifter components; 7.3 ns tpd ensures timing closure in 20-MHz cycle-based polling schemes. |
Use Scenario: Driving multiplexed LED clusters and relay drivers from a CAN-connected MCU in a vehicle body control unit. IC Role / Device Role / Timing Role: Bidirectional bus driver with parity handling, buffering MCU GPIO expansion lines to distributed lighting zones. Use Value: ±24 mA drive strength directly sinks LED currents; 3-state outputs prevent contention during CAN message arbitration windows. |
| Medical Imaging Data Acquisition FIFO | Test Equipment Digital Pattern Generator |
Use Scenario: Capturing parallel pixel data from high-speed CMOS image sensors before serialization for FPGA processing. IC Role / Device Role / Timing Role: Edge-triggered 10-bit register capturing sensor output on rising CLK edge, synchronized to master pixel clock. Use Value: 150 MHz fmax and sub-8 ns tpd support >100 MSPS sampling rates; low VOHV undershoot preserves signal integrity on long trace runs. |
Use Scenario: Generating precise 10-bit stimulus patterns for IC functional testing, where deterministic timing and bus isolation are critical. IC Role / Device Role / Timing Role: Programmable pattern latch holding test vectors until triggered by system sequencer's CLK and OE signals. Use Value: Independent OE allows glitch-free vector updates mid-test; 1.65–3.6 V VCC range matches tester's programmable voltage rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit bus-interface flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC821APWR | Same silicon, identical electrical specs, but in active production status (vs. SN74LVC821PWLE's OBSOLETE status); same TSSOP-24 package, 2000-piece reel packaging. | Designed for volume manufacturing programs requiring guaranteed long-term supply and standard tape-and-reel logistics. | Select SN74LVC821APWR for new designs needing assured availability, full TI warranty, and automated placement compatibility. |
| SN74LVC821ADWR | SOIC-24 package (DW), higher thermal resistance (θJA = 46°C/W vs. PW's 88°C/W), same logic function and timing specs; requires larger PCB footprint. | Better suited for prototyping, manual assembly, or legacy board upgrades where TSSOP rework is impractical. | Choose SN74LVC821ADWR when board space permits larger package or when leveraging existing SOIC footprints and tooling. |
Compared with SN74LVC821PWLE, SN74LVC821APWR offers identical performance with active production support and scalable packaging, while SN74LVC821ADWR trades compactness for mechanical robustness and ease of hand-soldering-neither is pin-compatible due to differing package geometries, but both implement the exact same logic architecture and timing behavior.
Availability
SN74LVC821PWLE is available at Aetrix Electronics and suitable for industrial PLC backplane interfaces, automotive body control modules, medical imaging data acquisition, and test equipment digital pattern generation requiring stable component supply and verified legacy functionality.
Supply support for SN74LVC821PWLE 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 specializing in analog, embedded processing, and logic solutions, with over 50 years of innovation in high-reliability interface and timing products.
The SN74LVC821PWLE belongs to TI's LVC (Low-Voltage CMOS) logic family, engineered for low-power, high-speed bus interfacing in mixed-voltage systems-specifically targeting industrial, automotive, and medical applications demanding robust level translation and noise immunity.
FAQ
What is the supply voltage range supported by SN74LVC821PWLE?
The SN74LVC821PWLE operates from 1.65 V to 3.6 V, with full functionality-including specified timing, drive strength, and I/O voltage tolerance-guaranteed across this range. At 1.65 V, it retains data but may exhibit reduced speed; at 3.6 V, it meets all AC/DC specifications per the SCAS304J datasheet. Operation outside this range risks damage or undefined behavior.
Does SN74LVC821PWLE support 5-V input signals?
Yes, SN74LVC821PWLE accepts input voltages up to 5.5 V on all D and OE pins, regardless of VCC level. This allows direct connection to 5-V logic outputs without external level shifters, making it suitable for mixed-voltage system interfacing-e.g., bridging a 5-V sensor bus to a 3.3-V microcontroller.
Is SN74LVC821PWLE pin-compatible with other packages in the SN74LVC821A family?
No-SN74LVC821PWLE uses the TSSOP-24 (PW) package, which has different pad layout, pitch (0.65 mm), and mechanical dimensions than SOIC-24 (DW), SSOP-24 (DB), or TVSOP-24 (DGV) variants. While all share identical pin functions and numbering, physical mounting and soldering require package-specific footprints; no PCB redesign is possible without layout revision.
What is the meaning of Ioff support in SN74LVC821PWLE?
Ioff support in SN74LVC821PWLE refers to an integrated circuit feature that disables all outputs when VCC = 0 V, preventing current backflow from live I/O lines into the unpowered device. This protects downstream circuitry during hot-swap, partial power-down, or system reset sequences and is validated per JESD78 latch-up standards.
Can SN74LVC821PWLE be used as a level translator between 3.3-V and 5-V domains?
Yes-SN74LVC821PWLE functions as a unidirectional level translator: its inputs tolerate 5.5 V while operating at 1.65–3.6 V VCC, and its outputs swing rail-to-rail (0 V to VCC). When driven by 5-V logic, it safely latches and re-drives at 3.3 V levels, enabling clean domain bridging in bus interfaces without external components.
SN74LVC821PWLE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- -
- Type:
- -
- Output Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Clock Frequency:
- -
- Max Propagation Delay @ V, Max CL:
- -
- Trigger Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Current - Quiescent (Iq):
- -
- Input Capacitance:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN74LVC821PWLE FAQ
1.How can I place an order for SN74LVC821PWLE through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC821PWLE 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 SN74LVC821PWLE reliable?
The price and inventory of SN74LVC821PWLE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC821PWLE is usually 5 days.
3.What payment methods are accepted for SN74LVC821PWLE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC821PWLE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC821PWLE?
SN74LVC821PWLE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC821PWLE 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 SN74LVC821PWLE?
For technical support, including SN74LVC821PWLE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC821PWLE requirements.
6.How does Aetrix verify that SN74LVC821PWLE is sourced from the original manufacturer or authorized distributors?
All SN74LVC821PWLE 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 SN74LVC821PWLE meets industry standards.
7.What is the process for return or replacement of SN74LVC821PWLE?
All SN74LVC821PWLE units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC821PWLE, 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 SN74LVC821PWLE part is unused and in its original packaging.
Return procedure for SN74LVC821PWLE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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