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Texas Instruments SN74ABT821ADWRG4
- Part No.:
- SN74ABT821ADWRG4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ABT821ADWRG4.pdf
- Description:
- IC FF D-TYPE SNGL 10BIT 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,157
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Product details
Overview
SN74ABT821ADWRG4 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 and embedded systems. It operates at 4.5–5.5 V, delivers ±32-mA high-drive outputs, supports 125-MHz clock frequency, and features power-up/power-down high-impedance state for bus isolation.
For engineers reviewing the SN74ABT821ADWRG4 datasheet, SN74ABT821ADWRG4 pinout, SN74ABT821ADWRG4 application, or SN74ABT821ADWRG4 equivalent, key selection criteria include 3-state bus contention control, TTL-compatible input thresholds, low propagation delay (tPLH/tPHL ≤ 6.2 ns), and SOIC-24 package compatibility with legacy ABT logic families.
Technical Context
This device implements ten independent D-type latches triggered on the positive edge of CLK, with synchronous data capture and asynchronous 3-state control via OE. Each output provides true-level logic (non-inverted Q) and supports bidirectional bus operation when paired with complementary drivers.
Its EPIC-IIB BiCMOS architecture enables low static current (ICC ≤ 38 mA) while sustaining high sink/source drive (IOL = 64 mA, IOH = –32 mA) and robust noise immunity (VIL = 0.8 V, VIH = 2 V). The device enters high-impedance state automatically when VCC is below 2.1 V, eliminating external power sequencing circuitry.
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 buses |
| Max Clock Frequency | 125 MHz - supports high-speed data latching in memory interfaces and I/O expansion |
| Output Drive | –32 mA IOH / 64 mA IOL - drives heavy capacitive loads (e.g., >50 pF) without external buffers |
| Propagation Delay | tPLH/tPHL ≤ 6.2 ns @ VCC = 5 V, CL = 50 pF - enables tight timing margins in synchronous bus designs |
| Enable Propagation | tPZH/tPLZ ≤ 6.3 ns - fast output enable/disable minimizes bus turnaround latency |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded and automation applications |
| Input Thresholds | VIH = 2 V, VIL = 0.8 V - fully compatible with TTL input levels and mixed-voltage system interfacing |
Pinout & Package
SN74ABT821ADWRG4 is packaged in a 24-pin SOIC (DW) body with 300-mil width, JEDEC MS-013 compliant, RoHS-compliant NIPDAU lead finish, and MSL Level-1 rating (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 | Data inputs (1D–10D) | Synchronous D inputs for each of ten flip-flop channels; accept TTL/CMOS logic levels |
| 11 | GND | Ground reference for all internal circuitry and output drivers |
| 12 | VCC | Positive supply rail (4.5–5.5 V); powers BiCMOS output stage and latch core |
| 13, 14, 15, 16, 17, 18, 19, 20, 21, 22 | Q outputs (1Q–10Q) | True-level registered outputs; tri-stated when OE is high |
| 23 | CLK | Global positive-edge clock input; synchronizes all ten D-to-Q transfers |
| 24 | OE | Active-low 3-state enable; high disables outputs into high-Z; does not affect internal latch state |
Key Features
| Feature | Design Value |
|---|---|
| High-Drive 3-State Outputs | –32 mA IOH / 64 mA IOL enables direct connection to long PCB traces or multi-drop buses without pull-ups or repeaters |
| Power-Up/Down High-Z | Automatic high-impedance state when VCC < 2.1 V prevents bus contention during power sequencing |
| Low Ground Bounce | VOLP < 1 V @ 5 V/25°C reduces signal integrity risk in dense digital layouts |
| Latch-Up Immunity | Exceeds 500 mA per JESD-17 - ensures robustness in noisy industrial environments |
| ESD Protection | ≥2000 V HBM per MIL-STD-883 Method 3015 - improves handling and board-level reliability |
| EPIC-IIB BiCMOS Process | Reduces dynamic power vs. pure bipolar while retaining TTL drive strength and speed |
Applications
| Industrial PLC Backplane Interface | Legacy Bus Buffering (ISA, VME) |
|---|---|
|
Use Scenario: Interfacing microcontroller GPIO banks to a 10-bit parallel backplane in programmable logic controllers. IC Role / Device Role / Timing Role: Synchronizes and isolates bidirectional data flow between CPU and peripheral modules using CLK and OE-controlled 3-state outputs. Use Value: Eliminates need for discrete bus transceivers; 64-mA sink capability drives long backplane traces with minimal signal degradation. |
Use Scenario: Extending ISA or VME bus data paths in retro-computing or test equipment where signal integrity degrades over long trace runs. IC Role / Device Role / Timing Role: Acts as a registered buffer to retiming and strengthen 10-bit data/address lines before fan-out to multiple slots. Use Value: 125-MHz max clock and sub-7-ns propagation delay preserve timing margins across legacy bus cycles up to 8 MHz. |
| Memory-Mapped I/O Expansion | Parity-Enabled Bidirectional Data Bus |
|
Use Scenario: Adding parallel I/O ports to an ARM9-based industrial controller requiring register-accessible status and control bits. IC Role / Device Role / Timing Role: Provides synchronized, latch-protected I/O port with software-controllable 3-state enable for shared bus arbitration. Use Value: OE pin allows runtime bus release without disturbing internal latch contents - critical for non-blocking peripheral access. |
Use Scenario: Implementing a 10-bit bidirectional data path with parity generation in safety-critical avionics subsystems. IC Role / Device Role / Timing Role: Latches data on rising CLK while OE manages direction; supports parity bit insertion via unused D/Q pins. Use Value: High noise immunity (2000-V ESD, 500-mA latch-up rating) meets DO-254 robustness requirements for airborne electronics. |
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 |
|---|---|---|---|
| SN74ABT821ADW | Same die, identical specs, but supplied in tube packaging (25 pcs) instead of tape-and-reel (2000 pcs) | No functional difference; preferred for prototyping or low-volume qualification builds | Select SN74ABT821ADW for engineering validation; SN74ABT821ADWRG4 for production line feeders |
| SN74ABT821ADWR | Identical electrical and thermal specs; same DW package, same marking "ABT821A"; G4 suffix denotes green/RoHS-compliant variant | No performance or layout impact; G4 indicates halogen-free mold compound and Pb-free terminations | SN74ABT821ADWRG4 is functionally and mechanically identical to SN74ABT821ADWR - choose G4 for full RoHS/REACH compliance |
Compared with SN74ABT821ADW and SN74ABT821ADWR, the SN74ABT821ADWRG4 offers identical timing, drive, and logic behavior but is optimized for automated SMT assembly via tape-and-reel delivery and certified green materials - making it the default choice for volume industrial manufacturing.
Availability
SN74ABT821ADWRG4 is available at Aetrix Electronics and suitable for industrial PLC backplanes, legacy bus buffering (ISA/VME), and memory-mapped I/O expansion requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.
Supply support for SN74ABT821ADWRG4 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 founded in 1930, specializing in analog, embedded processing, and logic solutions with broad industrial, automotive, and communications reach.
The SN74ABT821A belongs to TI's ABT logic family - engineered for high-speed, high-drive 5-V bus interface applications where signal integrity, noise immunity, and legacy system compatibility are critical.
FAQ
What is the maximum clock frequency supported by SN74ABT821ADWRG4?
The SN74ABT821ADWRG4 supports a maximum clock frequency of 125 MHz under recommended operating conditions (VCC = 5 V, TA = 25°C, CL = 50 pF). This specification is guaranteed across the full industrial temperature range (–40°C to +85°C) per the datasheet's timing characteristics table.
Does SN74ABT821ADWRG4 have built-in power-up/down high-impedance protection?
Yes, SN74ABT821ADWRG4 automatically places all outputs in high-impedance state when VCC is between 0 V and 2.1 V - covering both power-up and power-down transitions. This prevents bus contention without requiring external reset or OE control circuitry.
What is the output drive capability of SN74ABT821ADWRG4?
SN74ABT821ADWRG4 provides high-drive 3-state outputs rated at –32 mA (IOH) and 64 mA (IOL) at VCC = 5 V. This allows direct driving of heavily loaded buses, including those with >50-pF capacitance or multi-drop configurations, without external buffers.
Is SN74ABT821ADWRG4 pin-compatible with older SN74ABT821 variants?
Yes, SN74ABT821ADWRG4 uses the same SOIC-24 (DW) package and identical pinout as SN74ABT821ADW and SN74ABT821ADWR. All share identical terminal assignments, electrical behavior, and timing - enabling drop-in replacement in existing designs.
What does the "G4" suffix indicate in SN74ABT821ADWRG4?
The "G4" suffix in SN74ABT821ADWRG4 denotes TI's green packaging standard: halogen-free mold compound, lead-free terminations (NIPDAU), and full RoHS/REACH compliance. It is functionally identical to SN74ABT821ADWR but certified for environmentally regulated production.
SN74ABT821ADWRG4 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:
- Discontinued at Digi-Key
- 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
SN74ABT821ADWRG4 FAQ
1.How can I place an order for SN74ABT821ADWRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT821ADWRG4 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 SN74ABT821ADWRG4 reliable?
The price and inventory of SN74ABT821ADWRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT821ADWRG4 is usually 5 days.
3.What payment methods are accepted for SN74ABT821ADWRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT821ADWRG4 transactions.
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4.How is shipping managed for SN74ABT821ADWRG4?
SN74ABT821ADWRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT821ADWRG4 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 SN74ABT821ADWRG4?
For technical support, including SN74ABT821ADWRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT821ADWRG4 requirements.
6.How does Aetrix verify that SN74ABT821ADWRG4 is sourced from the original manufacturer or authorized distributors?
All SN74ABT821ADWRG4 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 SN74ABT821ADWRG4 meets industry standards.
7.What is the process for return or replacement of SN74ABT821ADWRG4?
All SN74ABT821ADWRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT821ADWRG4, 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 SN74ABT821ADWRG4 part is unused and in its original packaging.
Return procedure for SN74ABT821ADWRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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