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Texas Instruments SN74ABT651DWQ
- Part No.:
- SN74ABT651DWQ
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
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SN74ABT651DWQ.pdf
- Description:
- REGISTERED BUS TRANSCEIVER, ABT
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Inventory:3,000
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Product details
Overview
SN74ABT651DWQ from Texas Instruments is an octal bus transceiver and register IC with 3-state outputs, designed for bidirectional data flow control between two 8-bit buses (A and B). It integrates D-type flip-flops for data storage, dual clock inputs (CLKAB/CLKBA), dual select controls (SAB/SBA), and independent output enables (OEAB/OEBA), supporting real-time or stored data transfer at up to 125 MHz. It operates from 4.5 V to 5.5 V and is rated for –40°C to 85°C, commonly used in industrial backplane interfaces and programmable logic interconnects.
For engineers reviewing the SN74ABT651DWQ datasheet, SN74ABT651DWQ pinout, SN74ABT651DWQ application, or SN74ABT651DWQ equivalent, key selection criteria include its dual-register architecture, high-drive capability (–32 mA IOH / 64 mA IOL), low propagation delay (1.5–6.8 ns), 3-state bus isolation behavior, and SOIC-24 package compatibility with legacy TTL-level systems.
Technical Context
The SN74ABT651DWQ implements a multiplexed bus-management architecture with separate A→B and B→A data paths, each independently controllable via OEAB/OEBA and SAB/SBA. Its internal D flip-flops allow synchronous latching of data on either bus during rising-edge clock transitions, while real-time pass-through is enabled when select inputs are low and enables are active.
It uses EPIC-IIB BiCMOS process technology to achieve low ground bounce (<1 V VOLP), ESD robustness (>2000 V HBM), and latch-up immunity (>500 mA per JESD17). The device supports hot-swap safe power-up sequencing via external pullup/pulldown resistors on OEBA and OEAB, ensuring defined high-impedance states during voltage ramp.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5-V TTL and CMOS systems without level-shifting |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded and control applications |
| Max Clock Frequency | 125 MHz - supports high-speed synchronous bus arbitration in real-time control systems |
| Output Drive Strength | –32 mA IOH / +64 mA IOL - drives heavy capacitive loads and multiple TTL inputs directly |
| Propagation Delay | 1.5 ns (min) to 6.8 ns (max) - enables sub-8 ns cycle timing in tightly synchronized bus architectures |
| Input Clamp Current | –18 mA - protects against transient overvoltage on control pins without external diodes |
| Thermal Resistance θJA | 81°C/W (DW package) - defines maximum power dissipation under natural convection cooling |
Pinout & Package
SN74ABT651DWQ is housed in a 24-pin plastic small-outline integrated circuit (SOIC) package (DW), with 300-mil body width and standard JEDEC MS-013 outline. Pin 1 is located at the top-left corner marked by a beveled edge or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CLKBA | Rising-edge clock input controlling B→A register latch and real-time transfer enable |
| 2 | SAB | Select control for A→B path: low = real-time, high = stored data |
| 3 | OEAB | Active-low output enable for A→B direction; ties to GND for default enable |
| 4–11 | A1–A8 | 8-bit bidirectional data port A - connects to upstream logic or microcontroller data bus |
| 12 | GND | Power ground reference for all internal circuitry and I/O drivers |
| 13 | VCC | +5 V supply rail - must be decoupled locally with 0.1 µF ceramic capacitor |
| 14 | CLKAB | Rising-edge clock input controlling A→B register latch and real-time transfer enable |
| 15 | SBA | Select control for B→A path: low = real-time, high = stored data |
| 16 | OEBA | Active-low output enable for B→A direction; ties to VCC via pullup for safe power-up |
| 17–24 | B1–B8 | 8-bit bidirectional data port B - connects to downstream peripheral or memory bus |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent register banks | Enables concurrent capture of A- and B-bus data on separate clock edges, supporting ping-pong buffering |
| Multiplexed real-time/stored mode | Select pins (SAB/SBA) dynamically route either live bus signals or registered values without reconfiguration |
| High-drive 3-state outputs | –32 mA source / +64 mA sink capability maintains signal integrity across long traces or fan-out >10 |
| Low ground bounce (VOLP) | <1 V at VCC = 5 V ensures stable logic thresholds during simultaneous output switching |
| BiCMOS EPIC-IIB process | Reduces static power vs. pure bipolar while retaining speed and drive strength of ABT family |
| ESD & latch-up robustness | Exceeds 2000 V HBM and 500 mA latch-up current - suitable for board-level handling and noisy environments |
Applications
| Industrial Backplane Interface | Programmable Logic Interconnect |
|---|---|
Use Scenario: Bidirectional data exchange between CPU module and I/O expansion cards in modular PLC chassis. IC Role / Device Role / Timing Role: Bus transceiver and register providing isolated, clock-synchronized handshaking between asynchronous subsystems. Use Value: Enables deterministic data capture from field sensors and deterministic output to actuators using stored register state, eliminating metastability in multi-cycle transfers. |
Use Scenario: Glue logic between FPGA configuration memory and user logic fabric requiring synchronized bus bridging. IC Role / Device Role / Timing Role: Octal register-based buffer managing address/data multiplexing and timing alignment between slow flash and fast logic clocks. Use Value: Allows FPGA to read configuration data while simultaneously presenting updated status registers to host processor - no external FIFO required. |
| Legacy System Bus Extension | Test Equipment Data Path Control |
Use Scenario: Extending 8-bit ISA or STD bus segments with additional peripheral slots while preserving timing margins. IC Role / Device Role / Timing Role: Level-translating, high-drive transceiver enabling longer trace lengths and higher fan-out than original bus drivers. Use Value: Maintains 125 MHz clock tolerance and <6.8 ns propagation delay across extended bus runs, avoiding timing closure issues in retrofitted systems. |
Use Scenario: Signal routing and sampling control in automated test equipment (ATE) channel interface modules. IC Role / Device Role / Timing Role: Real-time data mirroring and gated capture node synchronizing stimulus generation with response acquisition. Use Value: Simultaneous OEAB/OEBA enable allows self-reinforcing bus hold during measurement windows, eliminating need for external bus keepers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver and register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT245DW | No internal registers; only real-time bidirectional transceivers with direction control (DIR) and output enable (OE). | Lacks storage capability - cannot hold data during bus contention or clock domain crossing. | Choose when only level translation and direction control are needed, not synchronous latching. |
| SN74ACT573N | Octal transparent latch (non-inverting), single-direction with G and Q outputs; no B-bus or dual-clock support. | Supports unidirectional latched output only; no bus-to-bus transfer or select-mode flexibility. | Prefer for simple output latching where A→B register function is sufficient and B→A path is unnecessary. |
Compared with SN74ABT245DW and SN74ACT573N, the SN74ABT651DWQ uniquely combines dual-directional 3-state transceivers with independent dual-register storage and multiplexed real-time/stored mode selection - making it irreplaceable in applications requiring synchronized bidirectional bus arbitration with data retention.
Availability
SN74ABT651DWQ is available at Aetrix Electronics and suitable for industrial backplane interfaces, programmable logic interconnects, legacy system bus extensions, and test equipment data path control requiring stable component supply and long-term lifecycle support.
Supply support for SN74ABT651DWQ 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 devices, with decades of heritage in high-reliability logic families including ABT, ACT, and LVC series.
The SN74ABT651DWQ belongs to TI's advanced BiCMOS ABT logic product line, engineered for high-speed, low-noise, industrial-grade bus interfacing where robustness, timing precision, and mixed-mode signal integrity are critical.
FAQ
What is the primary function of the SN74ABT651DWQ in a digital system?
The SN74ABT651DWQ serves as an octal bidirectional bus transceiver with integrated D-type registers, enabling synchronized data transfer between two 8-bit buses (A and B) either in real-time or from internal storage. Its dual-clock (CLKAB/CLKBA) and dual-select (SAB/SBA) architecture allows flexible, deterministic bus arbitration - essential for industrial controllers, FPGA interconnects, and legacy bus extension where timing predictability and data retention matter. The SN74ABT651DWQ delivers this functionality in a 24-pin SOIC package with 5-V operation and industrial temperature range.
How does the SN74ABT651DWQ handle power-up sequencing to avoid bus contention?
The SN74ABT651DWQ requires OEBA to be tied to VCC via a pullup resistor and OEAB to GND via a pulldown resistor to ensure defined high-impedance states during power ramp. This prevents unintended driver activation before system initialization completes. The minimum resistor values depend on the driver's current-sinking (OEBA) and current-sourcing (OEAB) capabilities - typically 4.7 kΩ suffices for most designs. This behavior is explicitly specified in the SN74ABT651DWQ datasheet to guarantee safe hot-insertion and cold-start operation without external sequencers.
Can the SN74ABT651DWQ operate at 3.3 V?
No, the SN74ABT651DWQ is not rated for 3.3 V operation. Its recommended supply voltage range is strictly 4.5 V to 5.5 V, and absolute maximum VCC is 7 V. Attempting 3.3 V operation results in undefined logic thresholds, degraded noise margins, and failure to meet AC timing specifications such as 125 MHz max clock frequency or sub-7 ns propagation delays. For 3.3 V systems, consider TI's SN74LVC245A or SN74ALVCH16245A as functionally similar but voltage-compatible alternatives - the SN74ABT651DWQ remains a 5-V-only device.
What is the significance of the "EPIC-IIB BiCMOS" process used in the SN74ABT651DWQ?
The EPIC-IIB BiCMOS process combines bipolar transistors for high-speed switching and CMOS for low static power, delivering the SN74ABT651DWQ's key advantages: 125 MHz clock capability, <1 V output ground bounce (VOLP), and significantly lower quiescent current versus older bipolar-only ABT predecessors. This process also enables the SN74ABT651DWQ's robust ESD protection (>2000 V HBM) and latch-up immunity (>500 mA), making it suitable for demanding industrial environments where reliability under electrical stress is non-negotiable.
Does the SN74ABT651DWQ support hot-swap or live-insertion into a powered backplane?
The SN74ABT651DWQ supports controlled hot-swap operation when OEBA and OEAB are externally biased to known states (VCC and GND respectively) prior to insertion, ensuring outputs remain in high-impedance until system firmware asserts valid control signals. Its Ioff specification (±100 µA at VCC = 0) guarantees minimal leakage when unpowered, preventing back-driving of live buses. However, full hot-swap compliance requires companion circuitry (e.g., slew-rate limited power rails, current-limiting FETs); the SN74ABT651DWQ itself provides the foundational electrical robustness needed - not complete plug-and-play capability.
SN74ABT651DWQ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
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- Mounting Type:
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- Supplier Device Package:
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SN74ABT651DWQ FAQ
1.How can I place an order for SN74ABT651DWQ through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT651DWQ 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 SN74ABT651DWQ reliable?
The price and inventory of SN74ABT651DWQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT651DWQ is usually 5 days.
3.What payment methods are accepted for SN74ABT651DWQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT651DWQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ABT651DWQ?
SN74ABT651DWQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT651DWQ 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 SN74ABT651DWQ?
For technical support, including SN74ABT651DWQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT651DWQ requirements.
6.How does Aetrix verify that SN74ABT651DWQ is sourced from the original manufacturer or authorized distributors?
All SN74ABT651DWQ 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 SN74ABT651DWQ meets industry standards.
7.What is the process for return or replacement of SN74ABT651DWQ?
All SN74ABT651DWQ units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT651DWQ, 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 SN74ABT651DWQ part is unused and in its original packaging.
Return procedure for SN74ABT651DWQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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