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Texas Instruments SN74ABT651NT
- Part No.:
- SN74ABT651NT
- Manufacturer:
- Texas Instruments
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74ABT651NT.pdf
- Description:
- IC TXRX INVERT 5.5V 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,870
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Product details
Overview
SN74ABT651NT 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) in high-speed digital systems. 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 SN74ABT651NT datasheet, SN74ABT651NT pinout, SN74ABT651NT application, or SN74ABT651NT equivalent, key selection criteria include its dual-register architecture, simultaneous A↔B storage capability, 5-V operation with TTL-compatible thresholds, and NT (plastic DIP-24) package suitability for prototyping and legacy board designs.
Technical Context
The SN74ABT651NT implements a multiplexed bus-management architecture with independent A-to-B and B-to-A paths, each controlled by dedicated clock, select, and enable signals. Its EPIC-IIB BiCMOS process enables low ground bounce (<1 V VOLP) and latch-up immunity (>500 mA per JESD 17).
Real-time transfer occurs when SAB/SBA are low; stored-data transfer requires high select inputs and prior clock-triggered latching into internal D flip-flops. Output isolation is guaranteed via 3-state control, and power-up/down high-impedance safety is achieved using external pullup/pulldown resistors on OEBA/OEAB.
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. |
| Max Clock Frequency | 125 MHz - Supports high-throughput bus arbitration in real-time control and data acquisition systems. |
| Output Drive Strength | –32 mA IOH / +64 mA IOL - Enables direct interface with multiple TTL loads without external buffers. |
| Propagation Delay | 1.5 ns to 6.4 ns - Guarantees sub-ns timing margins for synchronous 100+ MHz system clocks. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade embedded applications including motor control and instrumentation. |
| Input Thresholds | VIL = 0.8 V, VIH = 2.0 V - Matches standard TTL logic levels for seamless integration with legacy 5-V logic families. |
| ESD Protection | >2000 V HBM, >200 V MM - Reduces need for external ESD protection in board-level design. |
Pinout & Package
SN74ABT651NT is supplied in a 24-pin plastic dual-inline-package (PDIP-24), designated NT package per TI documentation. Pin numbering follows standard DIP orientation with Pin 1 at top-left corner (notch side).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CLKAB | Clock input for A→B register loading; rising edge captures A-bus data into internal DFFs. |
| 2 | SAB | Select control for A→B path; low = real-time transfer, high = stored-data transfer. |
| 3 | OEAB | Output-enable for A→B direction; low = active drive, high = high-impedance state. |
| 4–11 | A1–A8 | 8-bit data inputs/outputs for Bus A; bidirectional with 3-state control. |
| 12 | GND | Power ground reference for all internal circuitry and I/O structures. |
| 13 | VCC | Positive supply rail (4.5–5.5 V); powers BiCMOS core and output drivers. |
| 14 | CLKBA | Clock input for B→A register loading; rising edge captures B-bus data. |
| 15 | SBA | Select control for B→A path; low = real-time, high = stored-data transfer. |
| 16 | OEBA | Output-enable for B→A direction; low = active drive, high = high-Z. |
| 17–24 | B1–B8 | 8-bit data inputs/outputs for Bus B; fully symmetrical to A-port functionality. |
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 without external logic. |
| Multiplexed real-time/stored mode | Single control pin (SAB/SBA) selects between live bus pass-through or registered data, simplifying bus arbitration firmware. |
| High-drive 3-state outputs | –32 mA / +64 mA drive supports fan-out to ≥10 standard TTL loads, eliminating need for buffer ICs in dense backplane designs. |
| Low ground bounce (VOLP) | <1 V at VCC = 5 V ensures signal integrity during simultaneous output switching, critical for noise-sensitive analog-digital mixed-signal boards. |
| BiCMOS EPIC-IIB process | Combines bipolar speed and CMOS low static power, achieving 125-MHz operation with <30 mA ICC typical under load. |
Applications
| Industrial PLC Backplane Interface | Legacy Test Equipment Data Bus |
|---|---|
Use Scenario: Bidirectional communication between CPU module and I/O expansion cards in modular programmable logic controllers. IC Role / Device Role / Timing Role: SN74ABT651NT acts as a programmable bus isolator and register stage, synchronizing asynchronous peripheral data with the main controller clock domain. Use Value: Real-time transfer mode enables immediate sensor readback; stored-data mode allows deterministic scan-cycle updates without bus contention. |
Use Scenario: Interfacing microcontroller-based test head with legacy GPIB or parallel instrument buses requiring level-shifting and direction control. IC Role / Device Role / Timing Role: SN74ABT651NT serves as a direction-controlled data bridge, managing handshake timing between slow peripherals and fast controller buses. Use Value: High-drive outputs drive long parallel cables directly; 3-state isolation prevents signal corruption during bus turnaround transitions. |
| Automotive ECU Diagnostic Port | Embedded Data Acquisition System |
Use Scenario: Isolating diagnostic CAN/LIN controller from vehicle body electronics bus during firmware updates or calibration sessions. IC Role / Device Role / Timing Role: SN74ABT651NT functions as a controlled bus gate, enabling/disabling data flow based on secure boot status and update readiness flags. Use Value: OEAB/OEBA pins allow software-controlled hot-plug isolation; latch-up immunity (>500 mA) protects against automotive load-dump transients. |
Use Scenario: Buffering and registering analog-to-digital converter (ADC) output streams before transmission to FPGA-based processing pipeline. IC Role / Device Role / Timing Role: SN74ABT651NT operates as a synchronized data staging register, capturing ADC samples on CLKBA while forwarding previous frame via A-bus. Use Value: Dual-clock capability permits independent sampling and readout timing; 125-MHz max frequency supports >10 MSPS multi-channel acquisition. |
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 |
|---|---|---|---|
| SN74ABT245N | No internal registers; only real-time bidirectional transceivers with direction control (DIR) and output enable (OE). | Suitable for simple bus extension but lacks storage capability for pipelined or buffered transfers. | Choose when register functionality is unnecessary and cost or board space is constrained. |
| SN74ACT652N | Same pinout and function but uses ACT (advanced CMOS) process; lower drive (–24 mA/+24 mA) and no EPIC-IIB ground-bounce optimization. | Acceptable for lower-speed (<60 MHz), low-noise environments where BiCMOS advantages are not required. | Prefer when matching ACT-family timing or when reduced power consumption outweighs drive strength needs. |
Compared with SN74ABT245N and SN74ACT652N, the SN74ABT651NT uniquely delivers integrated storage plus high-drive 3-state outputs in a single DIP-24 package-enabling deterministic bus handshaking, glitch-free mode switching, and robust legacy-system interoperability without additional glue logic.
Availability
SN74ABT651NT is available at Aetrix Electronics and suitable for industrial PLC backplanes, legacy test equipment interfaces, automotive diagnostic ports, and embedded data acquisition systems requiring stable component supply across extended product lifecycles.
Supply support for SN74ABT651NT 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 logic families.
The ABT logic family-including SN74ABT651NT-is engineered for high-speed, high-drive 5-V TTL-compatible applications in industrial automation, test instrumentation, and automotive subsystems where reliability and timing precision are critical.
FAQ
What is the maximum operating frequency of the SN74ABT651NT?
The SN74ABT651NT supports a maximum clock frequency of 125 MHz under recommended operating conditions (VCC = 5 V, TA = 25°C). This rating applies to both CLKAB and CLKBA inputs and is validated across the full industrial temperature range (–40°C to +85°C), making the SN74ABT651NT suitable for high-throughput data routing in real-time control systems.
Does the SN74ABT651NT require external pull-up or pull-down resistors on its enable pins?
Yes - to ensure high-impedance outputs during power-up or power-down, OEBA must be tied to VCC via a pullup resistor and OEAB to GND via a pulldown resistor. The minimum resistor values depend on the driver's current-sinking (B→A) and current-sourcing (A→B) capabilities, as specified in the TI datasheet SCBS083E.
Can the SN74ABT651NT operate with a 3.3-V supply?
No - the SN74ABT651NT is specified only for 4.5 V to 5.5 V operation. Its input thresholds (VIH = 2.0 V, VIL = 0.8 V) and output drive characteristics are optimized for 5-V TTL compatibility. For 3.3-V systems, consider the SN74LVC652A or similar LVC-family devices instead of the SN74ABT651NT.
How does the SN74ABT651NT handle simultaneous data storage on both A and B buses?
The SN74ABT651NT supports concurrent storage: a low-to-high transition on CLKAB latches A1–A8 into its internal D flip-flops, while CLKBA↑ simultaneously captures B1–B8 - regardless of OEAB/OEBA or SAB/SBA states. This enables atomic snapshot capture of bidirectional bus activity, a key capability not found in basic transceivers like the SN74ABT245N.
Is the SN74ABT651NT pin-compatible with other packages in the ABT651 family?
Yes - the SN74ABT651NT (NT package) shares identical pinout and electrical functionality with SN74ABT651DW (SOIC-24), SN74ABT651DWR (tape-and-reel SOIC), and SN74ABT651PW (TSSOP-24). All variants use the same logic diagram, timing parameters, and truth table, allowing drop-in substitution across package types when mechanical constraints permit.
SN74ABT651NT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 24-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- Through Hole
- Supplier Device Package:
- 24-PDIP
SN74ABT651NT FAQ
1.How can I place an order for SN74ABT651NT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT651NT 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 SN74ABT651NT reliable?
The price and inventory of SN74ABT651NT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT651NT is usually 5 days.
3.What payment methods are accepted for SN74ABT651NT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT651NT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ABT651NT?
SN74ABT651NT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT651NT 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 SN74ABT651NT?
For technical support, including SN74ABT651NT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT651NT requirements.
6.How does Aetrix verify that SN74ABT651NT is sourced from the original manufacturer or authorized distributors?
All SN74ABT651NT 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 SN74ABT651NT meets industry standards.
7.What is the process for return or replacement of SN74ABT651NT?
All SN74ABT651NT units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT651NT, 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 SN74ABT651NT part is unused and in its original packaging.
Return procedure for SN74ABT651NT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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