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Texas Instruments SN74ABT651DW
- Part No.:
- SN74ABT651DW
- Manufacturer:
- Texas Instruments
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ABT651DW.pdf
- Description:
- IC TXRX INVERT 5.5V 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,157
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Product details
Overview
SN74ABT651DW from Texas Instruments is an octal bus transceiver and register IC with 3-state outputs, designed for bidirectional data multiplexing 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 independent output enables (OEAB/OEBA), supporting real-time or stored data transfer at up to 125 MHz with ±32-mA high-drive outputs.
For engineers reviewing the SN74ABT651DW datasheet, SN74ABT651DW pinout, SN74ABT651DW application, or SN74ABT651DW equivalent, key selection criteria include its 24-pin SOIC (DW) package, –40°C to 85°C industrial temperature range, 5-V operation, latch-up immunity (>500 mA), and ESD protection (>2000 V HBM), critical for robust bus isolation and register-controlled data staging in backplane and memory interface designs.
Technical Context
The SN74ABT651DW implements a dual-path bus management architecture: one path routes real-time A↔B data via 3-state transceivers; the other latches data into internal D flip-flops on CLKAB↑ or CLKBA↑ edges. Select controls SAB/SBA determine whether outputs reflect live bus signals (low) or registered values (high), enabling simultaneous storage and transfer modes.
Its EPIC-IIB BiCMOS process delivers low ground bounce (<1 V VOLP), high noise immunity (VIH = 2 V, VIL = 0.8 V), and rail-to-rail 3-state control-OEAB enables A→B drive while OEBA enables B→A drive, with independent pulldown/pullup requirements for power-up safety.
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 logic rails without level-shifting. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial environments including motor control and instrumentation systems. |
| Max Clock Frequency | 125 MHz - Supports high-speed synchronous bus arbitration and pipeline staging in real-time 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 6.8 ns - Enables sub-8-ns worst-case round-trip latency for A↔B data routing with tight timing margins. |
| ESD Protection | >2000 V HBM - Meets MIL-STD-883 Class 3015, reducing field failure risk during handling and board assembly. |
| Latch-Up Immunity | >500 mA per JESD 17 - Prevents destructive latch-up under transient overvoltage or supply sequencing faults. |
Pinout & Package
SN74ABT651DW uses a 24-pin SOIC (DW) package with 300-mil body width, 1.27-mm pitch, and JEDEC MS-013 compliant footprint. Thermal resistance θJA = 81°C/W supports continuous operation at full drive without forced airflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4–11, 13–20 | A1–A8, B1–B8 | 8-bit bidirectional data terminals - High-impedance when OEAB/OEBA inactive; direction controlled by enable polarity. |
| 3, 23 | OEAB, OEBA | Active-low output enables - OEAB controls A→B drive; OEBA controls B→A drive; both must be low for bidirectional pass-through. |
| 2, 12 | CLKAB, CLKBA | Positive-edge clock inputs - Trigger parallel load of A or B bus data into internal D flip-flops independently. |
| 5, 14 | SAB, SBA | Select controls - Low = real-time bus transfer; high = output registered data from internal flip-flops. |
| 10, 24 | GND, VCC | Power pins - Decoupling capacitor (0.1 µF) required within 10 mm of VCC/GND for stable high-speed switching. |
Key Features
| Feature | Design Value |
|---|---|
| Multiplexed real-time and stored data paths | Enables concurrent bus monitoring (real-time) and deterministic state capture (registered) without external logic. |
| Inverting data paths | Each A/B channel provides true and complement outputs - supports differential signaling or active-low bus architectures. |
| High-drive 3-state outputs | –32 mA source / +64 mA sink capability eliminates need for external line drivers in dense backplane applications. |
| Power-up/down high-impedance safety | OEBA tied to VCC and OEAB tied to GND via external resistors ensures bus isolation during supply ramp. |
| EPIC-IIB BiCMOS process | Reduces dynamic power vs. pure bipolar while maintaining TTL-compatible voltage thresholds and speed. |
Applications
| Backplane Data Multiplexing | Memory Interface Buffering |
|---|---|
Use Scenario: Isolating and routing address/data between CPU and multiple peripheral slots in a modular industrial controller chassis. IC Role / Device Role / Timing Role: Bidirectional bus transceiver and register - stores slot configuration data on CLKAB↑, then forwards it to CPU on demand via SAB-controlled output. Use Value: Eliminates need for separate latch + transceiver ICs, reducing component count and PCB area while guaranteeing setup/hold compliance at 125-MHz clock rates. |
Use Scenario: Interfacing a microcontroller's 8-bit data bus to dual-port SRAM with independent read/write enable timing. IC Role / Device Role / Timing Role: Octal register + transceiver - captures write data on CLKBA↑, holds it stable during SRAM access, then drives it onto memory bus via OEBA. Use Value: Resolves timing skew between MCU and memory by decoupling write capture (edge-triggered) from bus drive (level-controlled), improving system margin by >3 ns. |
| Test Equipment Signal Routing | Digital I/O Expansion Module |
Use Scenario: Switching between stimulus and response channels in automated test equipment (ATE) for mixed-signal IC validation. IC Role / Device Role / Timing Role: Real-time ↔ stored data selector - routes DUT output directly (SAB low) or delays it through register (SAB high) for synchronized sampling. Use Value: Enables jitter-free signal correlation across multiple test cycles using identical clock edges, critical for parametric accuracy at <100-ps resolution. |
Use Scenario: Adding isolated 8-bit parallel I/O to a PLC base unit via expansion connector with shared bus architecture. IC Role / Device Role / Timing Role: Bus-isolated transceiver - OEAB/OEBA sequenced to prevent contention during hot-plug insertion; registers retain last I/O state during reconfiguration. Use Value: Maintains safe I/O state during module swap without software intervention, meeting IEC 61131-2 Type 3 fault tolerance requirements. |
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 transceiver; 8-bit, non-inverting, single-direction control (DIR). | Cannot store data - suitable only for simple bus bridging without state retention or clocked staging. | Choose when clocked register functionality is unnecessary and lower propagation delay (1.3 ns min) is prioritized. |
| SN74LVTH16245ADGGR | 16-bit, dual-supply (3.3 V core / 5 V I/O), LVTH logic family; no internal registers; higher drive (+64 mA / –32 mA) but slower max frequency (80 MHz). | Designed for mixed-voltage systems; lacks SAB/SBA multiplexing - requires external logic for register-like behavior. | Choose for 3.3-V system integration with 5-V tolerant I/O, where register function is implemented externally or omitted. |
Compared with SN74ABT245DW and SN74LVTH16245ADGGR, the SN74ABT651DW uniquely combines octal bidirectional transceivers with dual-clock D registers and independent select/enable controls in a single 24-pin SOIC, enabling deterministic data staging and real-time multiplexing unattainable with simpler transceivers or wider-bus alternatives.
Availability
SN74ABT651DW is available at Aetrix Electronics and suitable for industrial backplane interconnects, memory interface buffering, ATE signal routing, and digital I/O expansion modules requiring stable component supply, long-lifecycle support, and guaranteed 5-V TTL compatibility.
Supply support for SN74ABT651DW 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 logic families and industrial-grade interface ICs.
The SN74ABT651DW belongs to TI's ABT-series advanced bi-directional bus transceivers, engineered for high-speed, low-noise, latch-up-immune data routing in mission-critical industrial and instrumentation systems.
FAQ
What is the maximum operating frequency of the SN74ABT651DW?
The SN74ABT651DW supports a maximum clock frequency of 125 MHz under recommended conditions (VCC = 5 V, TA = 25°C), verified by timing parameters including tPLH/tPHL ≤ 6.8 ns and tw ≥ 4 ns pulse width. This enables reliable operation in high-speed synchronous bus architectures such as industrial backplanes and memory controllers where deterministic latency is essential.
How does the SN74ABT651DW handle power-up sequencing to avoid bus contention?
To ensure high-impedance outputs during power-up, OEBA must be tied to VCC via a pullup resistor and OEAB to GND via a pulldown resistor. The minimum resistor values depend on driver current-sinking (B→A) and sourcing (A→B) capability, as specified in the datasheet. This prevents unintended drive states before firmware initializes control lines, protecting connected devices from bus conflicts.
Does the SN74ABT651DW support both real-time and registered data transfer simultaneously?
Yes - the SN74ABT651DW supports concurrent real-time and registered operation: when SAB = L and SBA = H, real-time data flows from A to B while stored data from prior CLKBA↑ events appears on B outputs. This dual-mode capability allows dynamic switching between immediate pass-through and deterministic state replay without external logic or additional ICs.
What is the thermal performance of the SN74ABT651DW in its SOIC (DW) package?
The SN74ABT651DW in the 24-pin SOIC (DW) package has a junction-to-ambient thermal resistance (θJA) of 81°C/W. At full drive (64 mA per output, all 16 lines active), typical power dissipation remains below 500 mW, allowing operation up to +85°C ambient without heatsinking - validated by TI's characterization across the industrial temperature range.
Can the SN74ABT651DW be used in mixed-voltage systems, such as interfacing 3.3-V logic to 5-V buses?
No - the SN74ABT651DW is a 5-V-only device with VIH = 2 V and VIL = 0.8 V, optimized for TTL/5-V CMOS compatibility. Its inputs are not 5-V tolerant when operated at 3.3 V VCC, and its outputs swing rail-to-rail at 5 V. For mixed-voltage interfaces, TI recommends the SN74LVTH16245A or similar LVTH-family devices with explicit 5-V tolerant I/O.
SN74ABT651DW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- 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
SN74ABT651DW FAQ
1.How can I place an order for SN74ABT651DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT651DW 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 SN74ABT651DW reliable?
The price and inventory of SN74ABT651DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT651DW is usually 5 days.
3.What payment methods are accepted for SN74ABT651DW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT651DW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ABT651DW?
SN74ABT651DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT651DW 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 SN74ABT651DW?
For technical support, including SN74ABT651DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT651DW requirements.
6.How does Aetrix verify that SN74ABT651DW is sourced from the original manufacturer or authorized distributors?
All SN74ABT651DW 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 SN74ABT651DW meets industry standards.
7.What is the process for return or replacement of SN74ABT651DW?
All SN74ABT651DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT651DW, 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 SN74ABT651DW part is unused and in its original packaging.
Return procedure for SN74ABT651DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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