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Texas Instruments SN74ABTR2245NSR
- Part No.:
- SN74ABTR2245NSR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74ABTR2245NSR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,742
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Product details
Overview
SN74ABTR2245NSR from Texas Instruments is an octal transceiver with 3-state outputs, designed for bidirectional asynchronous data bus communication between A and B ports. It features integrated 25-Ω series output resistors, operates from 4.5 V to 5.5 V, supports –40°C to 85°C temperature range, and provides high-impedance isolation during power-up/down-ideal for memory interface and bus isolation in industrial control systems.
For engineers reviewing the SN74ABTR2245NSR datasheet, SN74ABTR2245NSR pinout, SN74ABTR2245NSR application, or SN74ABTR2245NSR equivalent, key selection considerations include direction-control logic (DIR), output-enable timing (tPZH/tPLZ ≤ 6.3 ns), 12-mA drive capability per port, and SOIC-20 package compatibility with legacy board layouts.
Technical Context
This BiCMOS transceiver implements dual 8-bit bidirectional data paths controlled by DIR and OE inputs. Its EPIC-IIB architecture enables low-power operation while maintaining TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2 V) and rail-to-rail output swing under 12-mA load.
Power sequencing behavior is defined by VCC threshold: below 2.1 V, outputs enter high-impedance state automatically; above 2.1 V, OE must be actively pulled high via external resistor to guarantee isolation-ensuring robust bus contention prevention during system boot and shutdown sequences.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5-V logic rails and tolerant of ±10% regulation variation. |
| Operating Temperature | –40°C to 85°C - qualified for industrial-grade embedded systems without derating. |
| Output Drive | ±12 mA per I/O - sufficient to drive standard TTL loads and stubs on multi-drop buses. |
| Propagation Delay | tPLH/tPHL ≤ 4 ns at 5 V - enables reliable 100+ MHz bus toggle rates with margin. |
| Enable/Disable Time | tPZH/tPZL ≤ 6.3 ns - ensures fast bus arbitration and minimal glitch window during state transitions. |
| Integrated Series Resistor | 25 Ω per output - eliminates need for external termination, reduces overshoot/undershoot on FR-4 traces up to 10 cm. |
| Input Leakage | ±20 µA (A/B ports) - allows direct connection to microcontroller GPIO without pull-up/pull-down burden. |
Pinout & Package
SN74ABTR2245NSR is packaged in a 20-pin SOIC (DW) with 1.27-mm pitch, 7.5-mm body width, and 2.65-mm max height-compatible with IPC-7351 SOIC-20 footprint and standard reflow profiles (MSL Level-1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | DIR | Direction control: LOW routes B→A, HIGH routes A→B; TTL-compatible with 0.8 V/2 V thresholds. |
| 2–9 | A1–A8 | Port A bidirectional I/Os - each includes 25-Ω series resistor and ±12 mA drive capability. |
| 10 | GND | Ground reference for all logic and I/O circuits - requires low-inductance connection to PCB ground plane. |
| 11–18 | B1–B8 | Port B bidirectional I/Os - electrically identical to A-port pins; supports independent bus loading. |
| 19 | OE | Output enable: active LOW - asserts high-impedance state on both ports when HIGH or floating above 2.1 V. |
| 20 | VCC | Positive supply - must be decoupled with ≥0.1 µF ceramic capacitor within 5 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 25-Ω series termination | Eliminates external resistors on all 16 I/O lines, reducing BOM count and PCB area while controlling edge rates. |
| Power-up/power-down high-Z | Guarantees bus isolation when VCC < 2.1 V-prevents back-driving or latch-up during hot-insertion or brownout conditions. |
| EPIC-IIB BiCMOS process | Reduces static current to ≤250 µA in disabled state and cuts dynamic power vs. older bipolar transceivers. |
| Latch-up immunity | Exceeds 500 mA per JEDEC JESD17 - protects against accidental I/O short-circuits in noisy industrial environments. |
| ESD protection | ≥2000 V HBM and ≥200 V machine model - enables safe handling and assembly without special ESD controls. |
Applications
| Memory Bus Isolation | Industrial PLC Backplane |
|---|---|
Use Scenario: Isolating SRAM or Flash memory address/data buses from microcontroller during firmware update or debug mode. IC Role / Device Role / Timing Role: Bidirectional level-shifting transceiver enabling concurrent read/write operations across isolated domains with sub-5 ns propagation delay. Use Value: Prevents bus contention during reset sequences and eliminates need for discrete series resistors-reducing layout complexity and signal integrity risk. | Use Scenario: Interfacing multiple I/O modules to a central CPU over shared parallel backplane in programmable logic controllers. IC Role / Device Role / Timing Role: Octal bus transceiver managing direction-controlled data flow between CPU and expansion cards using DIR/OE handshaking. Use Value: Enables hot-swap-capable modular architecture with guaranteed high-Z during power cycling-avoiding system-wide lockup on module insertion/removal. |
| Legacy Peripheral Bridging | Test Equipment Signal Routing |
Use Scenario: Connecting modern microcontrollers to legacy parallel peripherals (e.g., dot-matrix printers, stepper motor controllers) with mismatched drive strength. IC Role / Device Role / Timing Role: Buffering and isolating bidirectional 8-bit data paths while matching voltage thresholds and slew rates. Use Value: Compensates for timing skew between dissimilar logic families and suppresses reflections via on-die 25-Ω resistors-improving interoperability without redesign. | Use Scenario: Configurable signal routing matrix in automated test equipment (ATE) where DUT interfaces require dynamic bus reconfiguration. IC Role / Device Role / Timing Role: Fast-switching 3-state transceiver enabling software-defined path selection between instrument channels and device-under-test pins. Use Value: Achieves <6.3 ns enable/disable latency for real-time test pattern switching-critical for high-throughput functional testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC2245APWR | 3.3-V only (1.65–3.6 V), lower drive (±24 mA), no integrated series resistors. | Requires external termination; unsuitable for 5-V systems or noise-sensitive long traces. | Select when migrating to 3.3-V logic and board space permits discrete resistors. |
| SN74ABT245N | Same 5-V operation but PDIP-20 package; lacks power-up high-Z behavior and integrated 25-Ω resistors. | Needs external pull-up on OE and series resistors; higher EMI risk on high-speed traces. | Choose only for through-hole prototyping or legacy DIP-based designs where SOIC is not feasible. |
Compared with SN74LVC2245APWR and SN74ABT245N, SN74ABTR2245NSR uniquely combines 5-V compatibility, built-in termination, and automatic power-sequence-safe isolation-making it optimal for industrial bus interfaces where reliability and layout simplicity are critical.
Availability
SN74ABTR2245NSR is available at Aetrix Electronics and suitable for industrial automation, test equipment, and legacy system upgrades requiring stable component supply, long-term obsolescence management, and RoHS-compliant SOIC packaging.
Supply support for SN74ABTR2245NSR 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 over 50 years of innovation in industrial and automotive electronics.
The ABTR2245 family was engineered for robust, low-glitch bidirectional bus interfacing in harsh environments-targeting applications demanding deterministic timing, high noise immunity, and seamless integration with legacy 5-V systems.
FAQ
What is the function of the DIR pin on the SN74ABTR2245NSR?
The DIR (direction-control) pin on the SN74ABTR2245NSR determines data flow direction: when DIR is LOW, data transfers from B-port to A-port; when HIGH, data flows from A-port to B-port. It operates with TTL-compatible thresholds (VIL ≤ 0.8 V, VIH ≥ 2 V) and directly controls internal bus switches without external logic-enabling simple, deterministic bidirectional communication in the SN74ABTR2245NSR.
Does the SN74ABTR2245NSR require external series resistors on its I/O lines?
No, the SN74ABTR2245NSR integrates 25-Ω series resistors on all 16 I/O lines (A1–A8 and B1–B8), eliminating the need for external termination components. This design reduces PCB component count, saves layout area, and actively suppresses signal overshoot and undershoot on typical FR-4 traces-confirmed in the SN74ABTR2245NSR datasheet's "Outputs Have Equivalent 25-Ω Series Resistors" specification.
How does the SN74ABTR2245NSR behave during power-up and power-down?
When VCC is below 2.1 V, the SN74ABTR2245NSR automatically places all outputs in high-impedance state-preventing bus contention during power ramp-up or brownout. Above 2.1 V, OE must be actively held HIGH (e.g., via pull-up resistor) to maintain isolation. This dual-threshold behavior is intrinsic to the SN74ABTR2245NSR's design and ensures safe operation across uncontrolled power sequences.
What package type is used for the SN74ABTR2245NSR?
The SN74ABTR2245NSR uses a 20-pin SOIC (DW) package with 1.27-mm lead pitch, 7.5-mm body width, and 2.65-mm maximum height. It complies with JEDEC MS-013 and IPC-7351 SOIC-20 standards, supports MSL Level-1 reflow, and is RoHS-compliant with NiPdAu lead finish-matching the mechanical and thermal specifications documented for the SN74ABTR2245NSR in TI's official packaging addendum.
Can the SN74ABTR2245NSR interface directly with 3.3-V logic devices?
No, the SN74ABTR2245NSR is a 5-V-only device with recommended VCC of 4.5–5.5 V and TTL-compatible input thresholds (VIH = 2 V min). While its outputs may be tolerated by some 3.3-V inputs, it lacks 3.3-V logic-level compatibility, and driving 3.3-V inputs directly risks overvoltage damage or unreliable switching. For mixed-voltage systems, level-shifting circuitry or a 3.3-V transceiver like SN74LVC2245APWR is required-not the SN74ABTR2245NSR.
SN74ABTR2245NSR 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
SN74ABTR2245NSR FAQ
1.How can I place an order for SN74ABTR2245NSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABTR2245NSR 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 SN74ABTR2245NSR reliable?
The price and inventory of SN74ABTR2245NSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABTR2245NSR is usually 5 days.
3.What payment methods are accepted for SN74ABTR2245NSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABTR2245NSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ABTR2245NSR?
SN74ABTR2245NSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABTR2245NSR 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 SN74ABTR2245NSR?
For technical support, including SN74ABTR2245NSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABTR2245NSR requirements.
6.How does Aetrix verify that SN74ABTR2245NSR is sourced from the original manufacturer or authorized distributors?
All SN74ABTR2245NSR 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 SN74ABTR2245NSR meets industry standards.
7.What is the process for return or replacement of SN74ABTR2245NSR?
All SN74ABTR2245NSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABTR2245NSR, 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 SN74ABTR2245NSR part is unused and in its original packaging.
Return procedure for SN74ABTR2245NSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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