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Texas Instruments SN74ABT25245DW
- Part No.:
- SN74ABT25245DW
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN74ABT25245DW.pdf
- Description:
- BUS TRANSCEIVER, ABT SERIES
- Quantity:
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Inventory:1,562
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Product details
Overview
SN74ABT25245 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), operates from –40°C to 85°C, and features bus-hold circuitry eliminating external pull resistors.
For engineers reviewing the SN74ABT25245 datasheet, SN74ABT25245 pinout, SN74ABT25245 application, or SN74ABT25245 equivalent, key selection criteria include its 25-Ω line-driving capability, distributed VCC/GND pin layout for noise reduction, high-impedance state during power-up/down, and compatibility with 5-V TTL logic families.
Technical Context
The SN74ABT25245 implements noninverting bidirectional data flow controlled by DIR (direction) and OE (output enable) inputs: when OE is low, data passes from A→B (DIR = high) or B→A (DIR = low); when OE is high, both ports enter high-impedance isolation. Its EPIC-IIB BiCMOS process enables low ground bounce (<1 V typical VOLP) and ESD protection exceeding 2000 V (MIL-STD-883).
It integrates active bus-hold on all A/B data inputs to maintain valid logic levels on floating lines, and features distributed power/ground pins across the 24-pin SOIC (DW) package to minimize simultaneous switching noise. The device enters high-impedance state when VCC is below 2.1 V, supporting robust power sequencing.
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. |
| A-port IOL | 188 mA - enables direct incident-wave switching on 25-Ω transmission lines without external termination. |
| B-port IOL | 64 mA - supports lower-drive interconnects while maintaining signal integrity on matched lines. |
| tPLH/tPHL | 1 ns to 3.9 ns - delivers sub-4-ns propagation delay for high-throughput bus arbitration and memory interfacing. |
| Bus-Hold Current | ±100 µA - actively holds unused A/B inputs at valid logic levels, removing need for external biasing components. |
| Power-Up State | High-impedance when VCC < 2.1 V - prevents bus contention during power ramp-up or brownout conditions. |
| θJA (DW) | 81 °C/W - defines thermal derating limit for continuous operation in compact PCB layouts with natural convection cooling. |
Pinout & Package
SN74ABT25245 is packaged in a 24-pin plastic small-outline (DW) package with 300-mil body width and standard SOIC footprint. Pin spacing is 0.050 inch (1.27 mm), and the package is RoHS-compliant per TI documentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3–6, 7–10, 12, 22–24 | A1–A8, B1–B8 data I/O | Octal bidirectional data terminals; each supports bus-hold and 3-state control via OE/DIR. |
| 13 | DIR | Direction control input: high = A→B, low = B→A; TTL-compatible threshold (VIL ≤ 0.8 V, VIH ≥ 2 V). |
| 14, 20 | VCC | Distributed power supply pins reduce simultaneous switching noise and improve signal integrity. |
| 2, 5, 8, 11, 15, 17–19 | GND | Six ground pins distributed across package to minimize ground bounce and return-path inductance. |
| 21 | OE | Output-enable input: active-low; forces all A/B ports into high-impedance state when high. |
Key Features
| Feature | Design Value |
|---|---|
| 25-Ω Line Driving | Delivers 188 mA sink current on A port to match 25-Ω PCB trace impedance, enabling clean incident-wave switching without overshoot. |
| Distributed VCC/GND Pins | Four VCC and six GND pins interleaved across the 24-pin DW package suppress simultaneous switching output (SSO) noise by >30% vs. single-rail layouts. |
| Integrated Bus-Hold | Eliminates external pullup/pulldown resistors on all 16 data lines, reducing BOM count and board space in sparse-bus or hot-swap applications. |
| Power Sequencing Safety | Guarantees high-impedance outputs when VCC is between 0–2.1 V, preventing backfeeding or contention during power-up/down transitions. |
| MIL-STD-883 ESD Rating | Exceeds 2000 V HBM - provides robust handling margin in manufacturing and field-repair environments without additional protection circuitry. |
Applications
| Memory Address Buffering | Backplane Data Transceivers |
|---|---|
|
Use Scenario: Isolating and driving address lines between microprocessor and multiple SRAM/ROM banks in embedded controllers. IC Role / Device Role / Timing Role: Bidirectional 3-state buffer that enables time-multiplexed address sharing while preventing bus contention during chip-select transitions. Use Value: 25-Ω drive strength matches PCB trace impedance to suppress reflections, and bus-hold maintains valid addresses during idle cycles without external resistors. |
Use Scenario: Interfacing parallel data buses across modular backplane slots in industrial PLCs or test equipment. IC Role / Device Role / Timing Role: Octal transceiver managing direction-controlled data flow between slot-local and backplane-wide buses under system-level DIR/OE arbitration. Use Value: Sub-4-ns propagation delay ensures timing closure across 10-inch backplane traces; distributed power pins reduce crosstalk-induced jitter on adjacent signal pairs. |
| Hot-Swappable I/O Modules | TTL-to-Backplane Interface |
|
Use Scenario: Enabling safe insertion/removal of peripheral modules in powered-backplane systems without disrupting main bus operation. IC Role / Device Role / Timing Role: Isolation gate that places module-local data lines in high-Z state during insertion until firmware asserts OE and DIR after power stabilization. Use Value: Power-up high-impedance behavior (VCC < 2.1 V) prevents glitch injection; bus-hold retains last valid state on floating lines during mechanical mating. |
Use Scenario: Level-translating and driving legacy TTL logic signals onto 25-Ω-terminated backplane traces in avionics or telecom shelf controllers. IC Role / Device Role / Timing Role: Impedance-matched driver converting standard 5-V TTL logic levels to incident-wave-compatible swing on controlled-impedance interconnects. Use Value: 188 mA A-port sink current directly drives 25-Ω loads without series resistors, preserving edge rate and minimizing stub reflections in multi-drop topologies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT245DW | Lacks bus-hold circuitry; requires external pull resistors on unused inputs; identical 25-Ω drive and pinout. | Suitable where input biasing is already implemented externally or inputs are always driven. | Choose SN74ABT245DW only if bus-hold is unnecessary and BOM simplification outweighs risk of floating inputs. |
| SN74LVC245APW | 3.3-V only operation (1.65–3.6 V); lower drive (24 mA), no 25-Ω optimization; supports mixed-voltage I/O. | Used in modern low-voltage systems with level-shifting requirements, not 5-V legacy backplanes. | Select SN74LVC245APW for 3.3-V domains requiring voltage translation; avoid for 5-V 25-Ω line driving. |
Compared with SN74ABT245DW and SN74LVC245APW, the SN74ABT25245 uniquely combines 5-V 25-Ω line driving, integrated bus-hold, and power-sequencing-safe high-Z behavior-making it irreplaceable in legacy industrial backplane and memory buffering designs requiring zero external biasing and deterministic startup.
Availability
SN74ABT25245 is available at Aetrix Electronics and suitable for memory subsystems, industrial backplanes, hot-swappable I/O modules, and legacy TTL-based control systems requiring stable component supply over extended production lifecycles.
Supply support for SN74ABT25245 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 founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The ABT family-including SN74ABT25245-is engineered for high-speed 5-V TTL-compatible bus interfacing with emphasis on signal integrity, noise immunity, and robust power sequencing in mission-critical industrial systems.
FAQ
What is the operating temperature range for the SN74ABT25245?
The SN74ABT25245 is characterized for operation from –40°C to +85°C. This commercial-grade temperature range supports deployment in industrial control panels, factory automation hardware, and outdoor telecommunications enclosures where ambient conditions remain within these limits. The SN74ABT25245 does not support extended military-range operation like the SN54ABT25245 (–55°C to 125°C).
Does the SN74ABT25245 require external pullup resistors on its data inputs?
No. The SN74ABT25245 includes active bus-hold circuitry on all A and B port inputs, which maintains unused or floating data lines at their last valid logic state using ±100 µA hold current. This eliminates the need for external pullup or pulldown resistors, reducing component count and PCB area in sparse-bus or hot-swap applications.
How does the SN74ABT25245 handle power-up and power-down sequencing?
The SN74ABT25245 automatically enters a high-impedance state when VCC is below 2.1 V, preventing bus contention during power ramp-up or brownout. To ensure high-Z above 2.1 V, OE must be tied to VCC via a pullup resistor. This behavior makes the SN74ABT25245 inherently safe for use in systems with asymmetric power rail sequencing.
Can the SN74ABT25245 drive 25-Ω transmission lines without external termination?
Yes. The SN74ABT25245's A-port is rated for 188 mA low-level output current, specifically optimized to match 25-Ω characteristic impedance lines. This allows clean incident-wave switching-where the driver's output impedance approximates the line's Z0-eliminating the need for series or parallel termination resistors in point-to-point or daisy-chained topologies.
What package type is used for the SN74ABT25245 in the DW suffix?
The SN74ABT25245DW uses a 24-pin plastic small-outline integrated circuit (SOIC) package with 300-mil body width and 1.27-mm lead pitch. It is pin-compatible with industry-standard SOIC-24 footprints and complies with JEDEC MS-013 specifications, enabling drop-in replacement in existing 5-V logic designs.
SN74ABT25245DW 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:
- -
SN74ABT25245DW FAQ
1.How can I place an order for SN74ABT25245DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT25245DW 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 SN74ABT25245DW?
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6.How does Aetrix verify that SN74ABT25245DW is sourced from the original manufacturer or authorized distributors?
All SN74ABT25245DW 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 SN74ABT25245DW meets industry standards.
7.What is the process for return or replacement of SN74ABT25245DW?
All SN74ABT25245DW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT25245DW, 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 SN74ABT25245DW part is unused and in its original packaging.
Return procedure for SN74ABT25245DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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