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Texas Instruments SN74ABT651DWR
- Part No.:
- SN74ABT651DWR
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ABT651DWR.pdf
- Description:
- IC TXRX INVERT 5.5V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,755
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Product details
Overview
SN74ABT651DWR 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, dual clock inputs (CLKAB/CLKBA), dual select controls (SAB/SBA), and dual output-enable inputs (OEAB/OEBA), supporting real-time or stored data transfer at up to 125 MHz with ±32-mA high-drive outputs.
For engineers reviewing the SN74ABT651DWR datasheet, SN74ABT651DWR pinout, SN74ABT651DWR application, or SN74ABT651DWR equivalent, key selection criteria include its dual-register architecture, simultaneous A↔B storage capability, 5-V operation with TTL-compatible thresholds, and SOIC-24 packaging optimized for space-constrained industrial bus interfaces.
Technical Context
The SN74ABT651DWR implements a dual-path bus management architecture: one path routes real-time data directly between A and B buses; the other latches data into internal D flip-flops on clock edges for synchronized, glitch-free transfer. Its EPIC-IIB BiCMOS process enables low ground bounce (<1 V VOLP) and high noise immunity while delivering –32-mA IOH / 64-mA IOL drive strength.
Control logic supports four distinct operational modes-real-time A→B, real-time B→A, stored A→B, and stored B→A-with independent enable/select inputs. Latch-up immunity exceeds 500 mA per JESD17, and ESD protection meets >2000 V HBM and >200 V machine model standards.
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. |
| Max Clock Frequency | 125 MHz - Enables high-speed synchronous bus arbitration in real-time control and data acquisition systems. |
| Output Drive | –32 mA IOH / 64 mA IOL - Drives heavy capacitive loads (e.g., long traces, multiple inputs) without external buffers. |
| Propagation Delay | 1.5 ns to 6.4 ns - Guarantees sub-8-ns worst-case timing across all signal paths (CLK→data, S→data, OE→output). |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade embedded applications including PLCs and motor drives. |
| Input Thresholds | VIL = 0.8 V, VIH = 2.0 V - Matches standard TTL logic levels for seamless integration with legacy controllers and FPGAs. |
| 3-State Leakage | ±50 µA IOZ - Minimizes bus contention current during high-impedance hold states in multiplexed backplanes. |
Pinout & Package
SN74ABT651DWR is housed in a 24-pin SOIC (DW) package measuring 15.4 mm × 7.5 mm × 2.35 mm, with gull-wing leads, RoHS-compliant NiPdAu finish, and moisture sensitivity level 1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | CLKBA, CLKAB | Asynchronous clocks for loading B→A and A→B registers; edge-triggered on rising edge for data capture. |
| 3, 23 | OEAB, OEBA | Active-low enables for A→B and B→A 3-state outputs; must be pulled to GND/VCC at power-up to ensure defined Hi-Z state. |
| 4–11, 13–20 | A1–A8, B1–B8 | Octal bidirectional I/O ports; internally isolated when OE is high; support bus-hold behavior via external pull resistors. |
| 12 | GND | Power ground reference for all logic and output stages; requires low-inductance connection to minimize switching noise. |
| 21, 22 | SBA, SAB | Select controls determining data source: low = real-time bus pass-through, high = registered (stored) data output. |
| 24 | VCC | 5-V supply input; decoupling capacitor (0.1 µF ceramic) required within 5 mm of pin for stable high-speed operation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent register banks | Enables concurrent storage of A-bus and B-bus data, allowing time-aligned cross-bus transfers without software intervention. |
| Multiplexed real-time + stored data paths | Eliminates need for external multiplexers in systems requiring both immediate and delayed bus access (e.g., diagnostic shadowing). |
| High-drive 3-state outputs | –32-mA sourcing / 64-mA sinking capability reduces trace impedance requirements and supports fan-out to ≥10 TTL loads. |
| Low ground bounce (VOLP < 1 V) | Prevents false logic transitions during simultaneous output switching-critical for noise-sensitive analog/mixed-signal subsystems. |
| BiCMOS EPIC-IIB process | Combines bipolar speed and CMOS low static power: ICC < 30 mA active, < 250 µA disabled-ideal for thermally constrained enclosures. |
Applications
| Industrial PLC Backplane Interface | Test Equipment Data Capture Module |
|---|---|
|
Use Scenario: Isolating and synchronizing data between CPU and I/O expansion modules in modular programmable logic controllers. IC Role / Device Role / Timing Role: Bus transceiver and register acting as a configurable bridge between processor and peripheral buses, enabling deterministic read/write cycles with zero wait states. Use Value: Eliminates external latch and buffer ICs by integrating storage and direction control-reducing BOM count and PCB area by 30% versus discrete solutions. |
Use Scenario: Capturing parallel sensor or actuator data streams under precise trigger conditions in automated test equipment. IC Role / Device Role / Timing Role: Dual-clock register capturing simultaneous A/B bus snapshots on independent triggers, then transferring stored values to measurement engine. Use Value: Achieves sub-3-ns setup/hold margins at 125 MHz, enabling reliable 8-bit parallel sampling at >100 MS/s without FPGA logic overhead. |
| Legacy System Bus Extender | Motor Drive Control Interface |
|
Use Scenario: Interfacing modern microcontrollers to aging 8-bit ISA or VMEbus peripherals requiring strict timing and voltage compliance. IC Role / Device Role / Timing Role: Level-translating and timing-aligning transceiver ensuring 5-V TTL compatibility while managing bus contention via controlled 3-state enable sequencing. Use Value: Maintains full 5-V noise margin and supports hot-swap-safe bus isolation-preventing lockups during field-replaceable module insertion. |
Use Scenario: Routing position feedback (encoder) and command signals between motion controller and multi-axis driver boards in CNC systems. IC Role / Device Role / Timing Role: Bidirectional register buffering encoder quadrature data and PWM command words with deterministic latency and glitch suppression. Use Value: Reduces jitter-induced positioning error by eliminating metastability through synchronized clock domains-achieving <±0.05° angular accuracy. |
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) instead of select (SAB/SBA). | Suitable for simple bus extension but lacks stored-data capability required for triggered snapshot capture or pipeline staging. | Choose when system design uses software-controlled data flow and does not require hardware-level synchronization between A/B buses. |
| SN74LVTH16245ADGGR | 16-bit, 3.3-V only, LVTH logic family; lower drive (–24 mA / 24 mA); no dual-clock register architecture. | Designed for low-voltage, high-density memory/data bus applications-not compatible with 5-V TTL systems or dual-register timing models. | Choose only for new 3.3-V designs where pin count and voltage scaling outweigh need for 5-V interoperability and register functionality. |
Compared with SN74ABT245DW and SN74LVTH16245ADGGR, the SN74ABT651DWR uniquely delivers integrated storage, 5-V robustness, and dual-clock control-making it irreplaceable in applications demanding hardware-synchronized bus arbitration and real-time/stored mode flexibility.
Availability
SN74ABT651DWR is available at Aetrix Electronics and suitable for industrial PLC backplanes, automated test equipment data capture modules, and legacy bus extender designs requiring stable component supply, long-term lifecycle support, and guaranteed 5-V TTL compatibility.
Supply support for SN74ABT651DWR 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 technologies, with over 90 years of innovation in industrial, automotive, and communications markets.
The ABT logic family-including SN74ABT651DWR-is engineered for high-speed, low-noise 5-V bus interface applications in harsh industrial environments, emphasizing drive strength, timing predictability, and latch-up resilience.
FAQ
What is the function of the SAB and SBA pins on the SN74ABT651DWR?
The SAB (Select A→B) and SBA (Select B→A) pins determine whether the SN74ABT651DWR transfers real-time bus data or previously stored register contents. When low, they enable direct pass-through; when high, they route data from internal D flip-flops. This dual-mode capability allows the SN74ABT651DWR to serve both immediate and time-aligned data transfer needs without external logic.
Does the SN74ABT651DWR support hot-swap or power sequencing requirements?
Yes-the SN74ABT651DWR incorporates design features for safe power sequencing: OEBA should be tied to VCC via a pullup resistor and OEAB to GND via a pulldown resistor to guarantee high-impedance outputs during power-up/down. This prevents bus contention and ensures predictable behavior in hot-plug systems, a critical requirement for the SN74ABT651DWR in modular industrial hardware.
Can the SN74ABT651DWR operate at 3.3 V?
No-the SN74ABT651DWR is specified only for 4.5 V to 5.5 V operation per its recommended conditions. Attempting 3.3-V supply violates absolute maximum ratings and results in undefined logic thresholds, degraded noise margins, and unreliable register behavior. For 3.3-V systems, TI recommends the SN74LVC16245A or similar LV family devices-not the SN74ABT651DWR.
How does the SN74ABT651DWR handle simultaneous clocking of both registers?
The SN74ABT651DWR supports simultaneous CLKAB↑ and CLKBA↑ transitions only when SAB and SBA are low (real-time mode). When either select input is high, clocks must be staggered per datasheet timing constraints to avoid race conditions-ensuring the SN74ABT651DWR reliably captures and isolates A- and B-bus data without corruption in stored-data applications.
What is the thermal performance of the SN74ABT651DWR in SOIC-24 package?
The SN74ABT651DWR in DW package has a junction-to-ambient thermal resistance (θJA) of 81°C/W. At maximum rated 64-mA sink current and 5-V supply, typical power dissipation remains below 300 mW-keeping junction temperature within safe limits (<105°C) even in 70°C ambient with minimal airflow, confirming suitability for the SN74ABT651DWR in sealed industrial enclosures.
SN74ABT651DWR 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
- Logic Type:
- Transceiver, Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- 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-SOIC
SN74ABT651DWR FAQ
1.How can I place an order for SN74ABT651DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT651DWR 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 SN74ABT651DWR reliable?
The price and inventory of SN74ABT651DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT651DWR is usually 5 days.
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SN74ABT651DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT651DWR 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 SN74ABT651DWR?
For technical support, including SN74ABT651DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT651DWR requirements.
6.How does Aetrix verify that SN74ABT651DWR is sourced from the original manufacturer or authorized distributors?
All SN74ABT651DWR 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 SN74ABT651DWR meets industry standards.
7.What is the process for return or replacement of SN74ABT651DWR?
All SN74ABT651DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT651DWR, 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 SN74ABT651DWR part is unused and in its original packaging.
Return procedure for SN74ABT651DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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