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Texas Instruments SN74ABT2245DWRE4
- Part No.:
- SN74ABT2245DWRE4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74ABT2245DWRE4.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,374
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Product details
Overview
SN74ABT2245DWRE4 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 supports 5-V operation (4.5–5.5 V), delivers ±64 mA A-port sink/source drive, integrates 25-Ω series resistors on B-port outputs to suppress overshoot/undershoot, and features high-impedance state during power-up/down - used in industrial backplane interfaces and legacy bus isolation.
For engineers reviewing the SN74ABT2245DWRE4 datasheet, SN74ABT2245DWRE4 pinout, SN74ABT2245DWRE4 application, or SN74ABT2245DWRE4 equivalent, key selection criteria include direction-control logic behavior, 3-state enable timing (tPZH/tPLZ < 6 ns), B-port 12-mA sink capability with integrated termination, and SOIC-20 package compatibility with IPC-7351 land patterns.
Technical Context
This device implements a dual-bus transceiver architecture with independent DIR (direction) and OE (output enable) control inputs. The A-port outputs are standard TTL-compatible drivers capable of ±64 mA, while B-port outputs embed 25-Ω series resistors to damp signal reflections without external components. Power sequencing is managed via inherent high-impedance behavior below 2.1 V VCC.
It uses TI's EPIC-IIB BiCMOS process to achieve low dynamic power dissipation while maintaining TTL-level input thresholds (VIH = 2 V, VIL = 0.8 V) and robust latch-up immunity (>500 mA per JESD-17). ESD protection exceeds 2000 V (MIL-STD-833) and 200 V (machine model).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL and LVTTL systems. |
| A-port IOL / IOH | 64 mA sink / 32 mA source - drives heavy capacitive loads or multiple TTL inputs directly. |
| B-port IOL | 12 mA sink - optimized for MOS/line-driver applications with built-in 25-Ω series termination. |
| tPLH / tPHL (A→B) | 1 ns min / 4 ns max - enables high-speed bidirectional data transfer at >100 MHz effective rates. |
| tPZH / tPLZ (OE→Output) | 1 ns min / 6 ns max - guarantees fast, glitch-free bus isolation during state transitions. |
| VIH / VIL | 2.0 V / 0.8 V - matches standard TTL input thresholds for seamless integration into legacy logic systems. |
| Operating Temperature | –40°C to +85°C - qualified for industrial ambient environments without derating. |
Pinout & Package
SN74ABT2245DWRE4 is housed in a 20-pin SOIC (DW) package, 7.5 mm × 12.8 mm body size, 1.27 mm lead pitch, 2.65 mm max height, RoHS-compliant NiPdAu lead finish, and MSL Level-1 rating (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | DIR | Direction control: LOW routes B→A; HIGH routes A→B - determines data flow path synchronously. |
| 2–9 | A1–A8 | A-bus data inputs/outputs - bidirectional I/O pins connected to local system bus. |
| 10 | GND | Ground reference - common return for all signals and power paths. |
| 11–18 | B1–B8 | B-bus data inputs/outputs - feature integrated 25-Ω series resistors for clean edge control. |
| 19 | OE | Output enable: LOW activates transceiver; HIGH forces all outputs into high-impedance - isolates both buses. |
| 20 | VCC | Power supply - 5-V nominal; device enters high-Z state if VCC drops below 2.1 V during power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| B-port integrated 25-Ω series resistors | Eliminates need for external termination components, reducing PCB area and layout complexity for high-speed bus stubs. |
| EPIC-IIB BiCMOS process | Reduces dynamic power consumption vs. standard bipolar TTL while retaining full 5-V drive strength and noise margin. |
| Power-up/power-down high-impedance | Prevents bus contention during supply ramping - no external pull-ups or sequencing circuitry required. |
| Latch-up immunity >500 mA | Meets JEDEC JESD-17 - ensures robust operation in noisy industrial environments with transient coupling. |
| 2000-V HBM ESD protection | Exceeds MIL-STD-833 requirements - enhances reliability during handling and board-level assembly. |
Applications
| Industrial Backplane Interface | Legacy System Bus Isolation |
|---|---|
|
Use Scenario: Interfacing microcontroller subsystems to parallel address/data buses in programmable logic controllers (PLCs) with mixed-voltage domains. IC Role / Device Role: Bidirectional level-shifting transceiver enabling safe A-bus ↔ B-bus data exchange under DIR/OE control. Use Value: Integrated B-port 25-Ω resistors suppress ringing on long backplane traces, eliminating external termination networks and improving signal integrity at 20+ MHz clock rates. |
Use Scenario: Isolating aging ISA or VMEbus peripherals from modern FPGA-based host controllers during system upgrades. IC Role / Device Role: 3-state bus buffer providing controlled enable/disable gating and direction reversal without software overhead. Use Value: High-impedance state during power-up prevents bus conflicts when hot-plugging modules, and ±64 mA A-port drive supports legacy TTL fan-out requirements. |
| Test Equipment Data Path Switching | Automated Test Fixture Signal Routing |
|
Use Scenario: Dynamic reconfiguration of stimulus/response paths in boundary-scan test systems using multiplexed digital I/O channels. IC Role / Device Role: Low-latency (tPLH < 4 ns), bidirectional data switch controlled by FPGA GPIO lines. Use Value: Sub-6 ns OE-to-output disable/enable times ensure precise timing alignment between test vectors and DUT response capture windows. |
Use Scenario: Routing sensor readout signals from multiple analog front-ends to a shared ADC channel in production test fixtures. IC Role / Device Role: Direction-controlled bus transceiver acting as programmable signal path selector with 3-state isolation. Use Value: DIR-controlled A↔B routing allows single IC to replace discrete mux + buffer combinations, reducing fixture component count and calibration drift sources. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT245DWRE4 | Same pinout and function but includes separate A- and B-side output-enable controls (OEA, OEB) instead of single OE. | Enables independent tri-state control of each bus side - useful where asymmetric isolation is required. | Select SN74ABT245DWRE4 only if independent bus-side disable is needed; otherwise SN74ABT2245DWRE4 offers simpler control logic. |
| SN74LVC245APWRE4 | 3.3-V only (1.65–3.6 V), lower drive (±24 mA), no integrated B-port resistors, and different voltage thresholds (VIH = 2.0 V @ VCC = 3.3 V). | Targets modern low-voltage systems; not interoperable with 5-V buses without level translation. | Choose SN74LVC245APWRE4 for 3.3-V-only designs requiring smaller TSSOP-20 footprint and lower power; avoid for 5-V legacy compatibility. |
Compared with SN74ABT245DWRE4 and SN74LVC245APWRE4, SN74ABT2245DWRE4 uniquely combines 5-V operation, integrated B-port termination, and single-OE simplicity - making it optimal for cost-sensitive industrial bus bridging where signal integrity and voltage compatibility are primary constraints.
Availability
SN74ABT2245DWRE4 is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system bus isolation, test equipment data path switching, and automated test fixture signal routing requiring stable component supply across extended temperature ranges.
Supply support for SN74ABT2245DWRE4 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 90 years of innovation in industrial, automotive, and communications markets.
The ABT logic family - including SN74ABT2245DWRE4 - was engineered for high-speed, 5-V TTL-compatible bus interfacing with enhanced noise immunity, low ground bounce, and robust power sequencing behavior in demanding industrial environments.
FAQ
What is the recommended operating voltage range for SN74ABT2245DWRE4?
The SN74ABT2245DWRE4 is specified for 4.5 V to 5.5 V operation. Operation outside this range may cause functional failure or damage. The device enters high-impedance state when VCC falls below 2.1 V, supporting safe power sequencing - critical for SN74ABT2245DWRE4 deployment in systems with uncontrolled rail ramp rates.
Does SN74ABT2245DWRE4 require external termination resistors on the B port?
No. SN74ABT2245DWRE4 integrates 25-Ω series resistors on all eight B-port outputs, specifically designed to reduce overshoot and undershoot on transmission lines. This eliminates the need for external resistors in point-to-point or short-stub bus topologies - a verified design feature confirmed in the SCBS234D datasheet Figure 3 schematic.
How does the DIR input control data flow direction in SN74ABT2245DWRE4?
In SN74ABT2245DWRE4, a LOW DIR input enables data transmission from B bus to A bus; a HIGH DIR input enables A-to-B transmission. This synchronous, level-sensitive control operates independently of OE - allowing direction setting before enabling outputs, which is essential for deterministic bus arbitration in SN74ABT2245DWRE4-based systems.
What is the maximum output current capability of the A port in SN74ABT2245DWRE4?
The A port of SN74ABT2245DWRE4 supports up to 64 mA sink current (IOL) and 32 mA source current (IOH) at VCC = 4.5 V, per the recommended operating conditions table. This drive strength meets or exceeds standard TTL fan-out requirements and supports direct connection to multiple legacy logic inputs without buffering.
Is SN74ABT2245DWRE4 compatible with automatic optical inspection (AOI) and solder paste inspection (SPI) processes?
Yes. SN74ABT2245DWRE4 uses a standard SOIC-20 (DW) package with 1.27 mm pitch and defined land pattern per IPC-7351 - fully supported by commercial AOI/SPI systems. TI's provided board layout and stencil design guidelines (DW0020A) confirm compatibility with 0.125 mm stencil thickness and symmetric pad geometry for reliable 100% solder joint coverage.
SN74ABT2245DWRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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-SOIC
SN74ABT2245DWRE4 FAQ
1.How can I place an order for SN74ABT2245DWRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT2245DWRE4 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 SN74ABT2245DWRE4 reliable?
The price and inventory of SN74ABT2245DWRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT2245DWRE4 is usually 5 days.
3.What payment methods are accepted for SN74ABT2245DWRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT2245DWRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ABT2245DWRE4?
SN74ABT2245DWRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT2245DWRE4 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 SN74ABT2245DWRE4?
For technical support, including SN74ABT2245DWRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT2245DWRE4 requirements.
6.How does Aetrix verify that SN74ABT2245DWRE4 is sourced from the original manufacturer or authorized distributors?
All SN74ABT2245DWRE4 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 SN74ABT2245DWRE4 meets industry standards.
7.What is the process for return or replacement of SN74ABT2245DWRE4?
All SN74ABT2245DWRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT2245DWRE4, 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 SN74ABT2245DWRE4 part is unused and in its original packaging.
Return procedure for SN74ABT2245DWRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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