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Texas Instruments SN74ABT2245NSR
- Part No.:
- SN74ABT2245NSR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74ABT2245NSR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,829
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Product details
Overview
SN74ABT2245NSR from Texas Instruments is an octal transceiver and line driver with 3-state outputs, designed for asynchronous bidirectional data bus communication between A- and B-buses. It features direction control (DIR), output enable (OE), B-port outputs with integrated 25-Ω series resistors, and operates over –40°C to 85°C at 4.5–5.5 V supply. Used in industrial backplane interfaces and legacy bus isolation.
For engineers reviewing the SN74ABT2245NSR datasheet, SN74ABT2245NSR pinout, SN74ABT2245NSR application, or SN74ABT2245NSR equivalent, key selection criteria include 3-state isolation timing (tPZH ≤ 5.6 ns), B-port sink capability (12 mA), A-port drive strength (64 mA), and compatibility with 5-V TTL/CMOS logic families.
Technical Context
The SN74ABT2245NSR implements a dual-bus transceiver architecture with independent DIR and OE controls: DIR selects data flow direction (A→B or B→A), while OE places all outputs in high-impedance state. Its EPIC-IIB BiCMOS process enables low power dissipation and robust latch-up immunity (>500 mA per JESD-17).
It supports hot-insertion-safe operation via inherent high-impedance behavior during power-up/down (VCC < 2.1 V), and integrates on-die 25-Ω series termination on all B-port outputs to suppress overshoot/undershoot without external components - critical for clean signal integrity on stub-loaded buses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL systems and margin against rail droop. |
| A-Port Output Drive | 64 mA sink (IOL) - supports driving heavy capacitive loads or multiple TTL inputs without external buffers. |
| B-Port Output Sink | 12 mA (IOL) with 25-Ω series resistor - eliminates need for discrete termination resistors on B-side traces. |
| Propagation Delay | tPLH/tPHL ≤ 4.2 ns (A↔B) - enables reliable operation in high-speed parallel bus applications up to ~100 MHz. |
| Enable/Disable Time | tPZH ≤ 5.6 ns, tPLZ ≤ 4.5 ns - ensures fast bus arbitration and minimal contention window during state transitions. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded control and communications equipment. |
| ESD Protection | 2000 V HBM, 200 V MM - meets MIL-STD-833 requirements for handling robustness in manufacturing and field service. |
Pinout & Package
SN74ABT2245NSR is packaged in a 20-pin SSOP (Shrink Small-Outline Package), 0.65 mm pitch, 7.5 mm × 5.6 mm body, 2.0 mm max height (DB package per TI drawing DB0020A). Pin 1 index located at top-left corner with beveled edge marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | DIR | Direction control input: LOW = B→A data transfer; HIGH = A→B data transfer. |
| 2–9 | A1–A8 | A-bus data inputs/outputs - bidirectional I/O pins connected to primary system bus. |
| 10 | GND | Ground reference for all internal circuitry and I/O signaling. |
| 11–18 | B1–B8 | B-bus data inputs/outputs - bidirectional I/O pins with integrated 25-Ω series termination. |
| 19 | OE | Output enable input: LOW = outputs active; HIGH = all outputs in high-impedance state. |
| 20 | VCC | Positive supply input (4.5–5.5 V) - powers internal logic and output drivers. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 25-Ω B-port series resistors | Eliminates external termination components, reduces PCB area, and improves signal fidelity on stubbed or unterminated B-bus traces. |
| EPIC-IIB BiCMOS process | Combines bipolar speed and CMOS low static power - achieves <1 V ground bounce (VOLP) and reduced ICC quiescent current. |
| Power-up/power-down high-Z | Automatically enters high-impedance state when VCC < 2.1 V - prevents bus contention during hot-swap or uncontrolled power sequencing. |
| Latch-up immunity >500 mA | Exceeds JEDEC JESD-17 - ensures reliability in noisy industrial environments with transient coupling or ESD events. |
| 3-state output isolation | Simultaneous disable of all A- and B-port drivers via single OE pin - enables clean bus sharing across multiple masters/slaves. |
Applications
| Industrial Backplane Interface | Legacy Bus Isolation |
|---|---|
|
Use Scenario: Interfacing microcontroller local bus to a multi-slot industrial backplane carrying RS-485 or CAN controller data. IC Role / Device Role / Timing Role: Bidirectional level-shifting and bus-driving transceiver enabling isolated data exchange between CPU and peripheral slots. Use Value: Integrated B-port 25-Ω termination suppresses reflections on long backplane traces; 64-mA A-port drive supports fan-out to eight peripheral address/data lines. |
Use Scenario: Isolating aging ISA or PC/104 bus segments during system upgrades to prevent signal corruption from mismatched timing or voltage domains. IC Role / Device Role / Timing Role: Direction-controlled 3-state buffer that decouples legacy bus sections during configuration or fault conditions. Use Value: Fast enable/disable (tPZH ≤ 5.6 ns) allows sub-10-ns arbitration windows; high-impedance on power ramp prevents metastability during cold boot. |
| Test Equipment Data Path | Programmable Logic Interconnect |
|
Use Scenario: Routing digital stimulus/response signals between FPGA-based pattern generators and DUT interface boards in automated test systems. IC Role / Device Role / Timing Role: Synchronized bidirectional data conduit controlled by FPGA GPIOs for DIR and OE. Use Value: Low propagation delay (≤4.2 ns) preserves timing margins in high-speed digital test vectors; 2000-V HBM ESD rating protects against handler-induced discharge. |
Use Scenario: Glue logic between CPLD I/O banks and external memory or peripheral ASICs operating at different voltage thresholds. IC Role / Device Role / Timing Role: Level-tolerant transceiver managing data flow between 3.3-V CPLD and 5-V legacy peripherals. Use Value: 5-V tolerant inputs accept mixed-voltage signaling; B-port 12-mA sink capability drives 5-V TTL loads directly without pull-up resistors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT245DW | Same ABT family, identical pinout and electrical specs, but SOIC-20 (DW) package instead of SSOP-20 (DB). | Preferred where board space allows larger SOIC footprint and hand-soldering or legacy reflow profiles are used. | Select SN74ABT245DW if SSOP assembly infrastructure is unavailable or thermal dissipation (θJA = 97°C/W vs. 115°C/W) is critical. |
| SN74LVC245APWR | 3.3-V only operation (1.65–3.6 V), lower drive (24 mA), no integrated B-port termination, LVCMOS-compatible I/O. | Suitable for modern low-voltage systems; not drop-in replaceable due to voltage and termination mismatch. | Choose SN74LVC245APWR only for new 3.3-V designs requiring lower power and smaller TSSOP-20 footprint - not for 5-V legacy replacement. |
Compared with SN74ABT245DW and SN74LVC245APWR, the SN74ABT2245NSR uniquely delivers 5-V operation with factory-integrated B-port termination in a space-efficient SSOP package - making it optimal for retrofitting industrial 5-V backplanes where layout revision is constrained.
Availability
SN74ABT2245NSR is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy bus isolation, automated test equipment data paths, and programmable logic interconnects requiring stable component supply and long-term obsolescence management.
Supply support for SN74ABT2245NSR 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 SN74ABT2245NSR belongs to TI's ABT-series advanced bi-directional transceivers, engineered specifically for robust 5-V bus interfacing in industrial, test, and computing systems demanding high noise immunity and signal integrity.
FAQ
What is the maximum data rate supported by the SN74ABT2245NSR?
The SN74ABT2245NSR is not characterized for a specific data rate, but its typical propagation delay (tPLH/tPHL ≤ 4.2 ns) and fast enable/disable times (tPZH ≤ 5.6 ns) support reliable operation in parallel bus systems up to approximately 100 MHz clock rates. System-level timing must account for trace capacitance, load, and setup/hold margins - actual achievable rate depends on PCB layout and bus loading.
Does the SN74ABT2245NSR require external pull-up resistors on OE or DIR?
Yes - OE and DIR are CMOS-compatible inputs with no internal pull-up or pull-down. To ensure deterministic state during power-up or when unused, OE should be tied to VCC via a pull-up resistor (minimum value determined by driver sourcing capability), and DIR must be actively driven or externally biased. Floating control inputs risk undefined bus behavior and increased ICC.
Can the SN74ABT2245NSR drive 50-Ω transmission lines directly?
No - the SN74ABT2245NSR's B-port has only 25-Ω series resistance, insufficient for proper 50-Ω line matching. It is intended for stub-loaded or short-board-trace applications (e.g., backplane branches, daughterboard interconnects), not point-to-point 50-Ω differential or single-ended transmission lines. For true 50-Ω driving, external series or parallel termination is required.
Is the SN74ABT2245NSR pin-compatible with the SN74ABT245 series?
Yes - SN74ABT2245NSR shares identical pinout, function mapping, and logic behavior with SN74ABT245 variants (e.g., SN74ABT245DW, SN74ABT245DBR). The "2245" and "245" designations are interchangeable in TI documentation; SN74ABT2245NSR is the standardized orderable part number for the DB-package variant of this device.
What is the thermal performance of the SN74ABT2245NSR in its SSOP package?
The SN74ABT2245NSR in SSOP (DB) package has a junction-to-ambient thermal resistance (θJA) of 115°C/W under standard JEDEC test conditions. At full 64-mA A-port load and 5.5-V supply, worst-case power dissipation is ~32 mA × 5.5 V ≈ 176 mW, resulting in ~20°C junction rise above ambient - well within safe operating limits for industrial use without forced airflow or heatsinking.
SN74ABT2245NSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 32mA, 64mA; 12mA, 12mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
SN74ABT2245NSR FAQ
1.How can I place an order for SN74ABT2245NSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT2245NSR 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 SN74ABT2245NSR reliable?
The price and inventory of SN74ABT2245NSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT2245NSR is usually 5 days.
3.What payment methods are accepted for SN74ABT2245NSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT2245NSR transactions.
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4.How is shipping managed for SN74ABT2245NSR?
SN74ABT2245NSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT2245NSR 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 SN74ABT2245NSR?
For technical support, including SN74ABT2245NSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT2245NSR requirements.
6.How does Aetrix verify that SN74ABT2245NSR is sourced from the original manufacturer or authorized distributors?
All SN74ABT2245NSR 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 SN74ABT2245NSR meets industry standards.
7.What is the process for return or replacement of SN74ABT2245NSR?
All SN74ABT2245NSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT2245NSR, 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 SN74ABT2245NSR part is unused and in its original packaging.
Return procedure for SN74ABT2245NSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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