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Texas Instruments SN74ABT863DBR
- Part No.:
- SN74ABT863DBR
- Manufacturer:
- Texas Instruments
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74ABT863DBR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,088
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Product details
Overview
SN74ABT863 from Texas Instruments is a 9-bit noninverting bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between A and B buses in industrial and embedded systems. It operates at 4.5–5.5 V, delivers ±32-mA high-drive outputs, features power-up/power-down high-impedance protection, and is rated for –40°C to 85°C operation in the DB (SSOP-24) package.
For engineers reviewing the SN74ABT863 datasheet, SN74ABT863 pinout, SN74ABT863 application, or SN74ABT863 equivalent, key selection considerations include its dual OE control architecture (OEAB1/OEAB2 and OEBA1/OEBA2), latch capability, ground bounce performance (<1 V VOLP), and compatibility with TTL-level logic interfaces in legacy backplane and board-to-board communication designs.
Technical Context
The SN74ABT863 implements a dual-control 9-bit bidirectional transceiver using EPIC-IIB BiCMOS technology to achieve low power dissipation while maintaining high-speed switching. Its four independent output-enable inputs (OEAB1, OEAB2, OEBA1, OEBA2) support flexible timing configurations including A→B, B→A, latched, and isolated modes.
It guarantees high-impedance outputs during power transitions (VCC = 0–2.1 V), and requires external pullup resistors on OE pins above 2.1 V to ensure reliable tri-state behavior. The device meets JESD 17 latch-up (>500 mA) and MIL-STD-883 ESD (>2000 V HBM) specifications, confirming robustness in noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with standard 5-V TTL and CMOS systems without level-shifting. |
| Operating Temperature | –40°C to 85°C - Qualified for industrial-grade deployment in programmable logic controllers and test equipment. |
| Output Drive | –32 mA IOH / 64 mA IOL - Sustains signal integrity across long traces or heavy capacitive loads (e.g., >50 pF). |
| Propagation Delay | 1 ns to 7 ns (tPLH/tPHL) - Supports data rates up to ~100 MHz in point-to-point bus applications. |
| Input Leakage | ±20 µA (A/B ports) - Minimizes current draw on shared bus lines and reduces static loading effects. |
| Thermal Impedance | 104°C/W (DB package) - Enables thermal management in compact PCB layouts without forced airflow. |
| Ground Bounce | VOLP < 1 V @ 5 V, 25°C - Reduces noise coupling into adjacent signals during simultaneous switching. |
Pinout & Package
SN74ABT863 is packaged in a 24-pin Shrink Small-Outline Package (SSOP-DB), with gull-wing leads, 0.64 mm pitch, and JEDEC MO-153 compliant dimensions (7.5 mm × 4.4 mm). Pin 1 is located at top-left corner with quadrants marked Q1 per tape-and-reel specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 11, 13, 14 | OEBA1, OEBA2, OEAB1, OEAB2 | Four independent 3-state enable inputs - Enable A→B (OEAB1/OEAB2 low) or B→A (OEBA1/OEBA2 low); both low enables latching mode. |
| 2–10 | A1–A9 | Input/output port A - Bidirectional data path tied to local bus; high-impedance when all OEAB/OEBA are high. |
| 12 | GND | Ground reference - Shared return for all I/O and internal logic; must be low-inductance connection. |
| 15–23 | B1–B9 | Input/output port B - Bidirectional data path tied to remote bus; mirrors A-port functionality with independent OE control. |
| 24 | VCC | Power supply - 5-V nominal; decoupling capacitor (0.1 µF) required within 1 cm of this pin. |
Key Features
| Feature | Design Value |
|---|---|
| EPIC-IIB BiCMOS process | Reduces dynamic power by >40% vs. standard bipolar TTL while retaining speed and drive strength. |
| Power-up/down high-Z | Prevents bus contention during system reset or hot-swap events without external circuitry. |
| High-drive outputs | –32 mA source / 64 mA sink capability drives 2–3 standard TTL loads or 10+ CMOS inputs directly. |
| Low ground bounce | VOLP < 1 V ensures stable reference for adjacent signals in dense multi-channel bus designs. |
| Latch mode support | Simultaneous low on all four OE inputs captures and holds bus state - useful for diagnostic or debug capture. |
Applications
| Industrial Backplane Interface | Legacy System Bus Extension |
|---|---|
Use Scenario: Interfacing a microcontroller-based control module to a 9-bit parallel I/O backplane in PLC rack systems. IC Role / Device Role / Timing Role: Bidirectional bus transceiver enabling synchronous read/write cycles between CPU and peripheral cards. Use Value: High drive strength and latch mode allow reliable signal transmission over 15-cm backplane traces with multiple stubs. |
Use Scenario: Extending an aging 80C86-based computer's data bus to add new memory-mapped peripherals. IC Role / Device Role / Timing Role: Level-compatible buffer isolating new peripherals from original bus timing constraints. Use Value: 5-V TTL compatibility and 7-ns max propagation delay preserve setup/hold timing margins without clock stretching. |
| Test Equipment Data Capture | Embedded Diagnostic Subsystem |
Use Scenario: Capturing parallel digital waveform data from DUTs in automated test fixtures. IC Role / Device Role / Timing Role: Transient bus isolator capturing snapshot data during trigger events via OE-controlled latching. Use Value: Four independent OE inputs enable precise windowing of capture windows without FPGA logic overhead. |
Use Scenario: Providing isolated status reporting from safety-critical subsystems to main controller via shared diagnostic bus. IC Role / Device Role / Timing Role: Fault-tolerant transceiver ensuring bus remains high-Z during subsystem power loss or reset. Use Value: Power-up/down high-Z behavior prevents false alarms or bus lockups during partial system resets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 9-bit bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT245DW | 8-bit, single-directional OE control (2 pins), lower drive (–24 mA/48 mA), same DB package. | Lacks latching and dual-bus direction flexibility; suitable only for unidirectional or simpler bidirectional use cases. | Select when bus width is ≤8 bits and timing control simplicity outweighs functional flexibility. |
| SN74LVTH16245ADGGR | 16-bit, 3.3-V only, LVTH logic family, higher speed (tPD < 3.5 ns), different pinout and voltage domain. | Requires level translation for 5-V systems; not drop-in compatible due to voltage and pin mapping mismatch. | Choose for new 3.3-V designs needing higher density and lower power, not for 5-V legacy replacement. |
Compared with SN74ABT245DW and SN74LVTH16245ADGGR, the SN74ABT863 uniquely supports 9-bit width, independent dual-OE control for latching and asymmetric bus arbitration, and native 5-V operation - making it irreplaceable in legacy industrial backplanes where bit count, voltage, and control granularity are fixed design constraints.
Availability
SN74ABT863 is available at Aetrix Electronics and suitable for industrial automation, test instrumentation, and embedded control systems requiring stable component supply and long-term obsolescence mitigation.
Supply support for SN74ABT863 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 industry-standard interface ICs.
The ABT logic family-including SN74ABT863-was engineered for high-noise industrial environments, emphasizing robust 5-V TTL compatibility, bus contention prevention, and extended temperature reliability.
FAQ
What is the function of the four OE inputs on the SN74ABT863?
The SN74ABT863 uses OEAB1/OEAB2 to control A→B data flow and OEBA1/OEBA2 to control B→A flow. When all four are low, the device enters latch mode, holding the last valid bus state. This architecture allows precise timing control without external logic, making SN74ABT863 ideal for systems requiring deterministic bus arbitration or diagnostic capture windows.
Does the SN74ABT863 support hot-swap or live-insertion scenarios?
Yes - the SN74ABT863 guarantees high-impedance outputs when VCC is between 0 V and 2.1 V, preventing bus contention during power ramp-up or down. For full protection above 2.1 V, OE pins must be pulled up to VCC via external resistors. This behavior makes SN74ABT863 suitable for modular backplane systems where cards may be inserted or removed under partial power.
Can the SN74ABT863 replace the SN74ABT823 or SN74ABT825 in existing designs?
No - the SN74ABT863 is not pin-compatible with SN74ABT823 (10-bit, different pinout) or SN74ABT825 (10-bit, different OE configuration). Its unique 9-bit width and four-OE layout mean direct substitution would require PCB redesign. SN74ABT863 should only be used where its specific 9-bit dual-OE architecture matches the original design intent.
What is the maximum capacitive load the SN74ABT863 can drive reliably?
The SN74ABT863 is characterized with CL = 50 pF in switching tests, and its 64-mA IOL rating supports driving ≥100 pF with acceptable rise/fall times (<10 ns). However, for sustained 50-MHz+ operation or >75-pF loads, series termination or reduced slew rate via external RC filtering is recommended to maintain signal integrity - verified in SN74ABT863 application notes for backplane routing.
Is the SN74ABT863 RoHS-compliant and lead-free?
Yes - the SN74ABT863DBR variant carries NIPDAU (nickel/palladium/gold) lead finish and is RoHS-compliant per TI's packaging documentation. It has MSL Level-1 rating (260°C peak reflow, unlimited floor life), and conforms to JEDEC J-STD-020 standards for moisture sensitivity and solderability - confirmed in TI's official package addendum dated November 2025.
SN74ABT863DBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 24-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 9
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 32mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SSOP
SN74ABT863DBR FAQ
1.How can I place an order for SN74ABT863DBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT863DBR 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 SN74ABT863DBR reliable?
The price and inventory of SN74ABT863DBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT863DBR is usually 5 days.
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SN74ABT863DBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT863DBR 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 SN74ABT863DBR?
For technical support, including SN74ABT863DBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT863DBR requirements.
6.How does Aetrix verify that SN74ABT863DBR is sourced from the original manufacturer or authorized distributors?
All SN74ABT863DBR 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 SN74ABT863DBR meets industry standards.
7.What is the process for return or replacement of SN74ABT863DBR?
All SN74ABT863DBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT863DBR, 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 SN74ABT863DBR part is unused and in its original packaging.
Return procedure for SN74ABT863DBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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