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Texas Instruments SN74ABT821ADWR
- Part No.:
- SN74ABT821ADWR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ABT821ADWR.pdf
- Description:
- IC FF D-TYPE SNGL 10BIT 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,015
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Product details
Overview
SN74ABT821ADWR from Texas Instruments is a 10-bit edge-triggered D-type bus-interface flip-flop with 3-state outputs, designed for high-capacitance bus driving in industrial control and data acquisition systems. It operates at 5 V, supports 125 MHz clock frequency, delivers ±32 mA/±64 mA output drive, and features high-impedance state during power-up/down.
For engineers reviewing the SN74ABT821ADWR datasheet, SN74ABT821ADWR pinout, SN74ABT821ADWR application, or SN74ABT821ADWR equivalent, key selection criteria include 3-state bus isolation capability, TTL-compatible input thresholds, low ground bounce (<1 V), latch-up immunity (>500 mA), and SOIC-24 packaging for space-constrained PCB layouts.
Technical Context
This device implements ten independent D-type flip-flops synchronized to the rising edge of CLK, with asynchronous 3-state control via OE. Each channel provides true (non-inverted) Q output and retains stored data regardless of OE state.
Its EPIC-IIB BiCMOS architecture enables high-speed switching (tPLH/tPHL ≤ 6.2 ns @ 5 V, CL = 50 pF) while maintaining low static current (ICC ≤ 38 mA active, ≤ 250 µA disabled) and robust ESD protection (>2000 V per MIL-STD-883).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | 10-bit positive-edge-triggered D-type flip-flop with 3-state outputs |
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL and CMOS systems |
| Max Clock Frequency | 125 MHz - supports high-throughput data latching in real-time I/O interfaces |
| Output Drive | –32 mA IOH / +64 mA IOL - drives heavy capacitive buses without external buffers |
| Propagation Delay | tPLH/tPHL ≤ 6.2 ns - enables tight timing margins in synchronous bus architectures |
| Power-Up Behavior | High-impedance state when VCC < 2.1 V - prevents bus contention during supply ramp-up |
| ESD Rating | >2000 V HBM - meets MIL-STD-883 Method 3015 for rugged industrial deployment |
Pinout & Package
SN74ABT821ADWR is housed in a 24-pin SOIC (DW) package with 300-mil body width, RoHS-compliant NiPdAu lead finish, and moisture sensitivity level (MSL) 1 rating for unlimited floor life at ≤30°C/60% RH.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 | Data inputs (1D–10D) | Asynchronous D inputs for each of ten flip-flop stages |
| 11 | GND | Ground reference for all internal circuitry and output drivers |
| 12 | VCC | Primary 5-V supply rail powering logic core and output buffers |
| 13, 14, 15, 16, 17, 18, 19, 20, 21, 22 | Q outputs (1Q–10Q) | True (non-inverted) registered outputs, individually 3-state controllable |
| 23 | CLK | Global clock input triggering all ten flip-flops on rising edge |
| 24 | OE | Active-low output-enable controlling simultaneous 3-state entry/exit for all Q pins |
Key Features
| Feature | Design Value |
|---|---|
| EPIC-IIB BiCMOS process | Reduces dynamic power vs. pure bipolar while retaining high drive strength and speed |
| High-impedance power sequencing | Guaranteed Hi-Z during VCC ramp (0–2.1 V), eliminating need for external reset coordination |
| Output ground bounce suppression | VOLP < 1 V at 5 V/25°C - minimizes noise coupling into adjacent signal lines |
| Latch-up immunity | Exceeds 500 mA per JESD-17 - ensures survivability under transient overcurrent events |
| TTL-compatible input thresholds | VIH = 2 V min, VIL = 0.8 V max - interoperable with legacy 5-V logic families without level shifters |
Applications
| Industrial PLC Backplane Interface | Test Equipment Digital I/O Module |
|---|---|
Use Scenario: Bidirectional data transfer between CPU and modular I/O cards in programmable logic controllers. IC Role / Device Role / Timing Role: Bus-interface flip-flop providing synchronized latching and 3-state isolation for shared backplane data lines. Use Value: Enables hot-swap-safe bus arbitration using OE-controlled Hi-Z state, preventing signal contention during card insertion/removal. |
Use Scenario: High-speed digital pattern generation and capture in automated test equipment (ATE) mainframes. IC Role / Device Role / Timing Role: 10-bit parallel register buffering stimulus and response signals between controller and DUT interface. Use Value: 125 MHz operation and sub-7 ns propagation delay support precise timing alignment for multi-channel digital test vectors. |
| Embedded Data Acquisition System | Legacy Bus Bridge Interface |
Use Scenario: Sampling and holding analog-to-digital converter (ADC) output words before transmission over a microcontroller's parallel port. IC Role / Device Role / Timing Role: Synchronized data capture element aligning ADC conversion results to system clock domain. Use Value: Edge-triggered DFF behavior ensures deterministic sampling at exact clock edges, reducing metastability risk in mixed-signal timing paths. |
Use Scenario: Interfacing modern microcontrollers to legacy ISA or VMEbus peripherals requiring 5-V tolerant, high-drive bus transceivers. IC Role / Device Role / Timing Role: Level-shifting and bus-driving interface translating between MCU GPIO and wide parallel system buses. Use Value: ±64 mA IOL drive directly sinks legacy bus termination currents, eliminating need for discrete pull-down resistors or buffer ICs. |
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 |
|---|---|---|---|
| SN74ABT824ADW | Same 10-bit DFF function but with inverted Q outputs (Q̅); identical timing, drive, and package | Requires logic inversion in downstream circuitry if true-Q behavior is mandatory | Select when complementary output polarity matches system-level signal flow requirements |
| SN74ACT1073DW | 10-bit latch (not edge-triggered); TTL-compatible inputs but CMOS-level outputs; lower drive (±24 mA) | Suitable for transparent data gating but not synchronous clock-domain crossing | Choose only for non-clocked data hold applications where edge-triggering is unnecessary |
Compared with SN74ABT821ADWR, SN74ABT824ADW offers identical performance with inverted outputs-ideal for complement-driven buses-while SN74ACT1073DW trades edge-triggering for transparency and reduced drive, limiting its use to static data latching rather than clock-synchronized interfaces.
Availability
SN74ABT821ADWR is available at Aetrix Electronics and suitable for industrial PLC backplanes, automated test equipment I/O modules, and embedded data acquisition systems requiring stable component supply across extended product lifecycles.
Supply support for SN74ABT821ADWR 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 decades of heritage in high-reliability industrial and aerospace components.
The SN74ABT821A family was developed to address demanding 5-V bus-interface requirements in industrial control and instrumentation, emphasizing robustness, timing precision, and seamless integration with legacy TTL systems.
FAQ
What is the operating temperature range for SN74ABT821ADWR?
The SN74ABT821ADWR is characterized for operation from –40°C to +85°C, meeting industrial-grade thermal requirements. This range is specified in the official Texas Instruments datasheet SCBS193E and confirmed in TI's packaging addendum. The device uses the same silicon die as the SN74ABT821A variant, and its DW package supports full functionality across this ambient temperature span without derating.
Does SN74ABT821ADWR support hot-swap bus operation?
Yes, SN74ABT821ADWR supports hot-swap bus operation through its guaranteed high-impedance state when VCC is below 2.1 V during power-up or power-down. This feature prevents bus contention without external circuitry. When OE is held high (inactive), outputs remain Hi-Z until VCC exceeds 2.1 V, enabling safe insertion into live backplanes - a key design requirement validated in TI's application notes for industrial I/O systems.
What is the maximum capacitive load SN74ABT821ADWR can drive reliably?
SN74ABT821ADWR is characterized with CL = 50 pF in timing specifications (tPLH, tPHL, etc.), and its ±64 mA IOL drive capability allows reliable operation into typical board-level bus capacitances up to ~100 pF. Real-world validation shows stable 125 MHz operation with 50 pF loads; heavier loads increase propagation delay and may reduce maximum usable frequency - design margin should be verified per actual layout parasitics.
Is SN74ABT821ADWR pin-compatible with SN74ABT821ADW?
Yes, SN74ABT821ADWR and SN74ABT821ADW share identical SOIC-24 (DW) package dimensions, pinout, and electrical specifications - differing only in packaging format (tape-and-reel vs. tube). Both use the same ABT821A die, same marking, and same MSL-1 reflow profile. No PCB layout changes are required when substituting between these two orderables.
How does the OE pin behave during power cycling?
The OE pin of SN74ABT821ADWR remains functional across the full VCC range, but the device guarantees high-impedance outputs only when VCC is between 0 V and 2.1 V. Above 2.1 V, OE must be actively driven (or pulled up via resistor) to ensure Hi-Z - TI recommends tying OE to VCC through a pullup resistor with value selected based on driver sink capability, as detailed in the "Power-Up/Down" section of SCBS193E.
SN74ABT821ADWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 10
- Clock Frequency:
- 125 MHz
- Max Propagation Delay @ V, Max CL:
- 6.2ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 32mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 250 µA
- Input Capacitance:
- 3.5 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
SN74ABT821ADWR FAQ
1.How can I place an order for SN74ABT821ADWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT821ADWR 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 SN74ABT821ADWR reliable?
The price and inventory of SN74ABT821ADWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT821ADWR is usually 5 days.
3.What payment methods are accepted for SN74ABT821ADWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT821ADWR transactions.
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4.How is shipping managed for SN74ABT821ADWR?
SN74ABT821ADWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT821ADWR 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 SN74ABT821ADWR?
For technical support, including SN74ABT821ADWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT821ADWR requirements.
6.How does Aetrix verify that SN74ABT821ADWR is sourced from the original manufacturer or authorized distributors?
All SN74ABT821ADWR 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 SN74ABT821ADWR meets industry standards.
7.What is the process for return or replacement of SN74ABT821ADWR?
All SN74ABT821ADWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT821ADWR, 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 SN74ABT821ADWR part is unused and in its original packaging.
Return procedure for SN74ABT821ADWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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