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Texas Instruments SN74ABTR2245NSRE4
- Part No.:
- SN74ABTR2245NSRE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74ABTR2245NSRE4.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,572
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Product details
Overview
SN74ABTR2245NSRE4 from Texas Instruments is an octal transceiver with 3-state outputs, designed for asynchronous bidirectional data bus communication between A and B ports. It features integrated 25-Ω series output resistors, operates over –40°C to 85°C, supports 5-V supply, and delivers 12-mA sink capability per I/O. It is used in industrial control backplanes and memory interface isolation.
For engineers reviewing the SN74ABTR2245NSRE4 datasheet, SN74ABTR2245NSRE4 pinout, SN74ABTR2245NSRE4 application, or SN74ABTR2245NSRE4 equivalent, key selection criteria include direction-control logic behavior, 3-state isolation timing (tPZH/tPLZ ≤ 6.3 ns), high-impedance state during power-up (VCC < 2.1 V), and compatibility with SOIC-20 PCB layouts.
Technical Context
This BiCMOS transceiver implements dual 8-bit bidirectional data paths controlled by DIR (direction) and OE (output enable) inputs. Its EPIC-IIB architecture enables low-power operation while maintaining TTL-compatible voltage thresholds (VIH = 2 V, VIL = 0.8 V) and fast propagation delays (tPLH/tPHL ≤ 4.5 ns at 5 V).
The device integrates on-die 25-Ω series termination on all A- and B-port outputs to suppress signal overshoot/undershoot without external resistors. It enters high-impedance state automatically during power-up/down when VCC is below 2.1 V, and latch-up performance exceeds 500 mA per JESD-17.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures stable operation across standard 5-V rail tolerances |
| Operating Temperature | –40°C to 85°C - qualified for industrial ambient environments |
| Output Drive | ±12 mA - supports direct connection to standard TTL loads without buffering |
| Propagation Delay | tPLH/tPHL ≤ 4.5 ns @ 5 V - enables reliable timing in high-speed bus applications up to ~100 MHz |
| 3-State Enable Time | tPZH ≤ 6.3 ns - guarantees rapid bus isolation during dynamic control transitions |
| Input Leakage | ±1 µA (control pins), ±20 µA (I/O pins) - minimizes static current draw in high-impedance states |
| ESD Protection | 2000 V HBM, 200 V MM - meets MIL-STD-833 requirements for board-level robustness |
Pinout & Package
SN74ABTR2245NSRE4 is packaged in a 20-pin SOIC (DW) package with 1.27-mm pitch, 12.83-mm width, and 2.65-mm max height. Pin 1 is located at the top-left corner with notch or index mark indication.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A8 | A-port data inputs/outputs | Bidirectional I/O pins connected to A-side bus; internally terminated with 25-Ω series resistor |
| B1–B8 | B-port data inputs/outputs | Bidirectional I/O pins connected to B-side bus; identical termination and drive strength as A-port |
| DIR | Direction control input | Low = B→A transfer; High = A→B transfer; determines data flow direction independent of OE |
| OE | Output enable input | Low = enable transceiver; High = force all A/B outputs into high-impedance state |
| VCC | Power supply | 5-V nominal supply; internal circuitry remains in high-Z until VCC ≥ 2.1 V |
| GND | Ground reference | Common return path for all I/O and internal logic; required for proper biasing and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 25-Ω series termination | Eliminates need for external source-series resistors on all 16 I/O lines, reducing BOM count and layout area |
| Power-up/power-down high-Z | Guarantees bus isolation during supply ramping (VCC < 2.1 V), preventing backdrive or contention on live buses |
| EPIC-IIB BiCMOS process | Reduces ICC in active state to ≤32 mA and standby leakage to ≤250 µA, improving system-level power efficiency |
| Latch-up immunity | Exceeds 500 mA per JEDEC JESD-17 - ensures robustness against transient-induced SCR triggering |
| TTL-compatible thresholds | VIH = 2 V, VIL = 0.8 V - enables seamless interfacing with legacy 5-V logic families without level-shifting |
Applications
| Industrial Backplane Interface | Memory Subsystem Isolation |
|---|---|
Use Scenario: Interfacing microcontroller local bus to modular I/O expansion chassis via ribbon cable. IC Role / Device Role / Timing Role: Bidirectional transceiver managing data flow between CPU and peripheral modules; DIR selects master/slave direction, OE isolates faulty segments. Use Value: Integrated 25-Ω termination suppresses reflections on 30-cm backplane traces, enabling error-free 20-MHz burst transfers without external components. | Use Scenario: Isolating SRAM or Flash memory address/data buses from processor during DMA or sleep modes. IC Role / Device Role / Timing Role: 3-state buffer enabling clean bus release; OE synchronized with memory controller's chip-select deassertion. Use Value: tPZH ≤ 6.3 ns ensures memory bus enters high-Z within one clock cycle, preventing read corruption during mode transitions. |
| Legacy System Bus Bridge | Test Equipment Signal Routing |
Use Scenario: Connecting ISA-bus peripherals to modern FPGA-based controllers in retro-computing instrumentation. IC Role / Device Role / Timing Role: Level-translating transceiver adapting 5-V TTL signaling to FPGA I/O banks; DIR set statically for unidirectional bridging. Use Value: VIH/VIL thresholds match ISA spec exactly, eliminating need for external pull-ups or voltage dividers in adapter designs. | Use Scenario: Reconfigurable signal path switching in automated test equipment (ATE) mainframes. IC Role / Device Role / Timing Role: Programmable bus switch controlled by test sequencer; multiple SN74ABTR2245NSRE4 units route DUT signals to measurement channels. Use Value: Low ground bounce (VOLP < 1 V) prevents false triggering of sensitive analog comparators during high-speed digital switching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC2245APW | 3.3-V only operation; lower drive (24 mA), no integrated 25-Ω resistors | Requires external termination; unsuitable for 5-V legacy systems | Select when migrating to 3.3-V logic and external termination is acceptable |
| SN74ABT2245N | Same function and pinout; PDIP-20 package instead of SOIC-20 | Through-hole mounting; higher θJA (67°C/W vs. 97°C/W), larger footprint | Select for prototyping or legacy through-hole assembly where SOIC reflow is unavailable |
Compared with SN74LVC2245APW and SN74ABT2245N, SN74ABTR2245NSRE4 uniquely combines 5-V operation, integrated 25-Ω termination, and SOIC-20 packaging-enabling drop-in replacement in space-constrained industrial backplanes without redesigning termination or layout.
Availability
SN74ABTR2245NSRE4 is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory subsystem isolation, legacy bus bridging, and ATE signal routing requiring stable component supply and long-term obsolescence management.
Supply support for SN74ABTR2245NSRE4 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 ABTR-series transceivers were developed to deliver robust, pin-compatible upgrades to legacy 74-series logic with enhanced ESD/latch-up immunity and integrated signal integrity features for industrial and telecom infrastructure.
FAQ
What is the recommended operating voltage range for SN74ABTR2245NSRE4?
The SN74ABTR2245NSRE4 is specified for 4.5 V to 5.5 V operation. Operation outside this range risks violating absolute maximum ratings (–0.5 V to 7 V), may cause undefined logic states, and invalidates guaranteed timing and drive performance. The device enters high-impedance state below 2.1 V, but full functionality requires VCC ≥ 4.5 V per recommended conditions.
Does SN74ABTR2245NSRE4 require external series resistors on its I/O lines?
No. SN74ABTR2245NSRE4 integrates 25-Ω series resistors on all A- and B-port outputs, explicitly eliminating the need for external termination. This feature is confirmed in the datasheet's "Outputs Have Equivalent 25-Ω Series Resistors" headline and electrical characteristics table, and applies directly to the SN74ABTR2245NSRE4 variant.
How does SN74ABTR2245NSRE4 behave during power-up and power-down sequences?
SN74ABTR2245NSRE4 automatically enters a high-impedance state when VCC is between 0 V and 2.1 V, preventing bus contention during supply ramping. Above 2.1 V, OE must be actively controlled (e.g., pulled high via resistor) to guarantee isolation. This behavior is inherent to the device's internal power-on reset circuit and is validated across the full –40°C to 85°C temperature range.
What is the maximum data rate supported by SN74ABTR2245NSRE4 in a typical bus application?
Based on worst-case propagation delay (tPHL/tPLH ≤ 4.5 ns at 5 V) and 3-state enable/disable times (tPZH/tPLZ ≤ 6.3 ns), SN74ABTR2245NSRE4 supports reliable operation up to approximately 100 MHz in point-to-point configurations with matched 50-Ω traces. Actual achievable rate depends on load capacitance, trace length, and termination - CL = 50 pF is used in official timing measurements.
Is SN74ABTR2245NSRE4 pin-compatible with other members of the ABTR2245 family?
Yes. SN74ABTR2245NSRE4 shares identical pinout, function table, and electrical behavior with all SN74ABTR2245 variants (e.g., DW, DWR, PWR), differing only in packaging and reel/tube configuration. The "NSRE4" suffix denotes SOIC-20 packaging with tape-and-reel delivery, and all pin assignments (A1–A8, B1–B8, DIR, OE, VCC, GND) match the DW package drawing in the datasheet.
SN74ABTR2245NSRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABTR
- 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:
- 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
SN74ABTR2245NSRE4 FAQ
1.How can I place an order for SN74ABTR2245NSRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABTR2245NSRE4 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 SN74ABTR2245NSRE4 reliable?
The price and inventory of SN74ABTR2245NSRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABTR2245NSRE4 is usually 5 days.
3.What payment methods are accepted for SN74ABTR2245NSRE4?
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4.How is shipping managed for SN74ABTR2245NSRE4?
SN74ABTR2245NSRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABTR2245NSRE4 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 SN74ABTR2245NSRE4?
For technical support, including SN74ABTR2245NSRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABTR2245NSRE4 requirements.
6.How does Aetrix verify that SN74ABTR2245NSRE4 is sourced from the original manufacturer or authorized distributors?
All SN74ABTR2245NSRE4 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 SN74ABTR2245NSRE4 meets industry standards.
7.What is the process for return or replacement of SN74ABTR2245NSRE4?
All SN74ABTR2245NSRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABTR2245NSRE4, 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 SN74ABTR2245NSRE4 part is unused and in its original packaging.
Return procedure for SN74ABTR2245NSRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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