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Texas Instruments SN74ABT25245NT
- Part No.:
- SN74ABT25245NT
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74ABT25245NT.pdf
- Description:
- BUS TRANSCEIVER, ABT SERIES
- Quantity:
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Inventory:1,931
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Product details
Overview
SN74ABT25245NT from Texas Instruments is a 25-Ω octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between A and B buses in high-speed digital systems. It supports incident-wave switching on 25-Ω transmission lines, sinks up to 188 mA (A port) and 64 mA (B port) at VCC = 4.5 V, and operates across –40°C to 85°C. Used in memory address drivers, clock distribution, and bus-isolation applications requiring low ground bounce (<1 V) and bus-hold functionality.
For engineers reviewing the SN74ABT25245NT datasheet, SN74ABT25245NT pinout, SN74ABT25245NT application, or SN74ABT25245NT equivalent, key selection criteria include its 25-Ω line-driving capability, distributed VCC/GND pin layout for noise reduction, active bus-hold on all data inputs, 3.5 ns max propagation delay, and NT-package compatibility with through-hole PCB assembly.
Technical Context
The SN74ABT25245NT implements EPIC-IIB BiCMOS logic to achieve high drive strength while minimizing power dissipation. Its direction-control (DIR) and output-enable (OE) inputs govern bidirectional data flow and 3-state isolation, with OE-low enabling operation and DIR determining A→B or B→A transmission path.
It features distributed VCC and GND pins to suppress simultaneous switching noise, and internal bus-hold circuitry eliminates external pullup/pulldown resistors on floating data inputs. During power-up/down (VCC 0–2.1 V), the device enters high-impedance state without external control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL/CMOS systems and stable operation under rail variation. |
| Output Drive (A port, IOL) | 188 mA - enables incident-wave switching on 25-Ω transmission lines without signal reflection. |
| Propagation Delay (tPLH/tPHL) | Max 3.9 ns at VCC = 5 V - supports >250 MHz bus toggle rates in synchronous designs. |
| Bus-Hold Current | ±100 µA at VI = 0.8 V / 2.0 V - actively maintains valid logic levels on unused A/B inputs without external components. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded and computing applications. |
| Ground Bounce (VOLP) | <1 V at VCC = 5 V, TA = 25°C - reduces noise coupling into adjacent signals and power rails. |
| ESD Protection | >2000 V HBM, >200 V MM - exceeds MIL-STD-883 requirements for handling robustness. |
Pinout & Package
SN74ABT25245NT uses a 24-pin plastic dual in-line package (NT), with through-hole mounting and 0.6-inch body width. Pin spacing follows standard DIP pitch (0.1 inch), supporting legacy prototyping and industrial PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A8 | Data inputs/outputs (A-side bus) | Bi-directional I/O ports with bus-hold; connect to local system bus or controller interface. |
| B1–B8 | Data inputs/outputs (B-side bus) | Bi-directional I/O ports with bus-hold; interface to peripheral, memory, or expansion bus. |
| DIR | Direction control input | Low = B→A data flow; High = A→B data flow - determines transceiver directionality. |
| OE | Output enable input | Low = device active; High = all A/B ports enter high-impedance - enables bus sharing and isolation. |
| VCC | Power supply | Two dedicated pins (pins 16 & 21) reduce IR drop and improve noise immunity during switching. |
| GND | Ground reference | Four dedicated pins (pins 2, 5, 8, 11) minimize ground bounce and provide low-inductance return paths. |
Key Features
| Feature | Design Value |
|---|---|
| 25-Ω line driving | Optimized for incident-wave switching on controlled-impedance PCB traces, eliminating termination resistors in point-to-point links. |
| Distributed VCC/GND pins | Reduces simultaneous switching output (SSO) noise by lowering shared inductance - improves signal integrity in dense bus layouts. |
| Integrated bus-hold | Eliminates need for external 10-kΩ pullup/pulldown resistors on A/B data lines, reducing BOM count and board space. |
| Power-up/power-down high-Z | Automatically isolates buses when VCC is below 2.1 V - prevents backfeeding and data corruption during sequencing. |
| Low ground bounce (VOLP) | <1 V peak ensures reliable logic-level recognition at receivers even during full-bus switching events. |
Applications
| Memory Address Buffering | Backplane Data Isolation |
|---|---|
Use Scenario: Driving address lines from a microcontroller to multiple SRAM or Flash devices on a shared bus. IC Role / Device Role / Timing Role: Bidirectional address transceiver with bus-hold, enabling clean address latching and preventing floating states during chip select transitions. Use Value: Eliminates external pullups on address lines and ensures deterministic logic levels during idle cycles, improving system reliability in multi-drop memory configurations. |
Use Scenario: Isolating CPU-side and peripheral-side data buses across a 25-Ω impedance-matched backplane. IC Role / Device Role / Timing Role: 3-state octal transceiver providing direction-controlled, low-skew data transfer with incident-wave optimization. Use Value: Enables clean signal edge integrity over 10+ inch backplane traces without series termination, reducing component count and layout complexity. |
| Legacy Bus Expansion | Industrial Control I/O Interface |
Use Scenario: Extending ISA or LPC bus signals between motherboard and add-in cards in industrial PCs. IC Role / Device Role / Timing Role: Level-shifting and bus-isolation transceiver supporting TTL-compatible voltage thresholds and fast enable/disable timing. Use Value: Provides sub-4 ns propagation and 6.5 ns max enable-to-output delay, meeting tight timing budgets of legacy parallel bus protocols. |
Use Scenario: Interfacing PLC CPU modules with field I/O boards using isolated 5-V data buses. IC Role / Device Role / Timing Role: Robust bus transceiver with >2000 V HBM ESD rating and –40°C to +85°C operation for harsh factory environments. Use Value: Withstands repeated handling and electrostatic discharge in uncontrolled settings while maintaining bus stability during power cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT245N | No bus-hold circuitry; requires external pullup/pulldown resistors on all data lines. | Suitable only where inputs are always driven; not recommended for floating or undriven bus segments. | Select SN74ABT245N only if BOM simplification via bus-hold is unnecessary and layout allows discrete termination. |
| SN74LVC245APW | 3.3-V only operation (1.65–3.6 V); lower drive (24 mA), no 25-Ω line-driving optimization. | Targeted for low-voltage mixed-signal systems; incompatible with 5-V buses without level translation. | Choose SN74LVC245APW only for new 3.3-V designs where power efficiency and smaller TSSOP package outweigh 5-V compatibility and line-drive performance. |
Compared with SN74ABT245N and SN74LVC245APW, the SN74ABT25245NT uniquely combines 5-V operation, 25-Ω transmission-line drive, integrated bus-hold, and industrial temperature range - making it the only direct solution for legacy 5-V bus buffering with zero external bias components and incident-wave signal integrity.
Availability
SN74ABT25245NT is available at Aetrix Electronics and suitable for memory address buffering, backplane data isolation, legacy bus expansion, and industrial control I/O interface applications requiring stable component supply and long-term industrial lifecycle support.
Supply support for SN74ABT25245NT 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.
The ABT logic family, including SN74ABT25245NT, was engineered for high-speed 5-V bus interfacing with enhanced noise immunity, low ground bounce, and robust ESD tolerance - targeting industrial, computing, and communications infrastructure.
FAQ
What is the maximum output current capability of SN74ABT25245NT on the A port?
The SN74ABT25245NT supports up to 188 mA of low-level output current (IOL) on the A port at VCC = 4.5 V. This high sink capability enables incident-wave switching on 25-Ω transmission lines without external termination, directly supporting clean signal edge integrity in high-speed bus applications. The specification is validated per TI's SCBS251C datasheet under recommended operating conditions.
Does SN74ABT25245NT require external pullup or pulldown resistors on its data lines?
No, SN74ABT25245NT includes active bus-hold circuitry on all A and B data inputs, providing ±100 µA hold current to maintain valid logic levels on floating or undriven lines. This eliminates the need for external pullup or pulldown resistors, reducing BOM cost and PCB real estate - a key differentiator versus non-bus-hold variants like SN74ABT245N.
What is the operating temperature range specified for SN74ABT25245NT?
The SN74ABT25245NT is characterized for operation from –40°C to +85°C, qualifying it for industrial-grade applications. This range is explicitly defined in the "recommended operating conditions" table of the SCBS251C datasheet and distinguishes it from the military-grade SN54ABT25245 (–55°C to +125°C). Thermal performance is supported by θJA = 67°C/W for the NT package.
How does SN74ABT25245NT behave during power-up and power-down sequences?
SN74ABT25245NT automatically enters a high-impedance state when VCC is between 0 V and 2.1 V, preventing bus contention or backfeeding during power ramping. This behavior is intrinsic to the device's design and requires no external circuitry. To guarantee high-Z above 2.1 V, OE must be tied to VCC via a pullup resistor - a detail confirmed in the functional description section of the official datasheet.
What package type does SN74ABT25245NT use, and is it compatible with standard DIP footprints?
SN74ABT25245NT uses the NT package: a 24-pin plastic dual in-line package with 0.6-inch body width and 0.1-inch pin pitch. It is fully compatible with industry-standard DIP-24 footprints and through-hole assembly processes, enabling drop-in replacement in legacy designs originally using ceramic (JT) or plastic DIP packages - as confirmed in the package diagram and ordering information of TI's SCBS251C datasheet.
SN74ABT25245NT 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:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN74ABT25245NT FAQ
1.How can I place an order for SN74ABT25245NT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT25245NT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
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5.How can I obtain technical support or documentation for SN74ABT25245NT?
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6.How does Aetrix verify that SN74ABT25245NT is sourced from the original manufacturer or authorized distributors?
All SN74ABT25245NT 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 SN74ABT25245NT meets industry standards.
7.What is the process for return or replacement of SN74ABT25245NT?
All SN74ABT25245NT units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT25245NT, 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 SN74ABT25245NT part is unused and in its original packaging.
Return procedure for SN74ABT25245NT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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