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Texas Instruments SN74ABT2245DBR
- Part No.:
- SN74ABT2245DBR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74ABT2245DBR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,011
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Product details
Overview
SN74ABT2245DBR 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 25-Ω series termination, and operates from –40°C to 85°C at 4.5–5.5 V. Used in industrial backplane interfaces and legacy bus isolation.
For engineers reviewing the SN74ABT2245DBR datasheet, SN74ABT2245DBR pinout, SN74ABT2245DBR application, or SN74ABT2245DBR equivalent, key selection criteria include its 20-pin SSOP package, 3.8 ns typical A→B propagation delay, 12 mA B-port sink capability, integrated 25-Ω series resistors on B outputs, and high-impedance state during power-up/down.
Technical Context
The SN74ABT2245DBR implements a dual-bus transceiver architecture with independent DIR and OE controls enabling bidirectional data flow: low DIR routes B→A, high DIR routes A→B, and high OE forces all outputs into high-impedance isolation. Its EPIC-IIB BiCMOS process delivers low power dissipation while maintaining TTL-compatible voltage thresholds (VIH = 2 V, VIL = 0.8 V) and robust latch-up immunity (>500 mA).
B-port outputs integrate 25-Ω series resistors to suppress overshoot/undershoot without external components, while A-port outputs support higher drive strength (64 mA sink). The device enters high-impedance state when VCC is below 2.1 V, and requires OE tied to VCC via pullup resistor above that threshold to guarantee isolation.
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 |
| A-port Output Sink Current | 64 mA - supports driving heavier loads or longer traces on A-side buses |
| B-port Output Sink Current | 12 mA - optimized for MOS/line-driver applications with integrated 25-Ω series termination |
| A→B Propagation Delay | 1 ns min / 3.8 ns max - enables high-speed bus bridging up to ~130 MHz effective data rate |
| Input Clamp Current | –18 mA - protects inputs against negative transients per JEDEC JESD-17 |
| Thermal Resistance θJA | 115 °C/W - defines maximum power dissipation limit in DB package at ambient |
| ESD Protection | 2000 V HBM - exceeds MIL-STD-833 requirements for handling robustness |
Pinout & Package
SN74ABT2245DBR uses a 20-pin Shrink Small-Outline Package (SSOP, DB) with 0.65 mm pitch, 7.4 mm × 5.0 mm body, and 2.0 mm max height. Pin 1 index area located at top-left corner (Q1 quadrant in tape).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | DIR | Direction control input: low = B→A, high = A→B |
| 2–9 | A1–A8 | A-bus data inputs/outputs (bidirectional I/O) |
| 10 | GND | Ground reference for logic and power return path |
| 11–18 | B1–B8 | B-bus data inputs/outputs with integrated 25-Ω series resistors |
| 19 | OE | Output enable: low = active, high = 3-state isolation |
| 20 | VCC | Positive supply (4.5–5.5 V); powers internal BiCMOS circuitry |
Key Features
| Feature | Design Value |
|---|---|
| B-port 25-Ω series termination | Eliminates need for external series resistors, reducing BOM count and PCB space in line-driving applications |
| High-impedance during power sequencing | Prevents bus contention during power-up/down when VCC < 2.1 V, enhancing system reliability |
| EPIC-IIB BiCMOS process | Reduces static power consumption versus standard bipolar TTL while retaining speed and drive strength |
| Latch-up immunity >500 mA | Meets JEDEC JESD-17, enabling safe operation in noisy industrial environments |
| TTL-compatible input thresholds | VIH = 2 V / VIL = 0.8 V allows direct interfacing with legacy 5-V logic families without level shifting |
Applications
| Industrial Backplane Interface | Legacy System Bus Isolation |
|---|---|
Use Scenario: Isolating CPU and peripheral buses in programmable logic controllers (PLCs) with mixed-voltage subsystems. IC Role / Device Role / Timing Role: Bidirectional transceiver managing data flow between 5-V control bus and isolated I/O expansion bus. Use Value: Prevents bus contention during hot-swap events and ensures clean signal integrity using B-port 25-Ω termination. | Use Scenario: Interfacing microcontroller-based modules with older ISA or VMEbus peripherals in test equipment. IC Role / Device Role / Timing Role: Level-shifting and direction-controlled buffer enabling synchronous read/write cycles across legacy bus segments. Use Value: Eliminates external termination resistors and guarantees high-Z state during reset, simplifying board design. |
| Embedded Data Acquisition Hub | Automated Test Equipment (ATE) Signal Routing |
Use Scenario: Aggregating sensor data from multiple analog front-ends onto a central FPGA processing bus. IC Role / Device Role / Timing Role: Octal transceiver synchronizing time-critical ADC sample transfers between isolated domains. Use Value: 3.8 ns A→B propagation delay supports sampling rates up to 130 MSPS with deterministic timing. | Use Scenario: Dynamically reconfiguring signal paths between DUT interface boards and measurement instruments. IC Role / Device Role / Timing Role: Programmable bus switch controlled by FPGA GPIO to route digital stimulus/response signals. Use Value: OE-controlled 3-state isolation prevents signal leakage during path switching, ensuring measurement accuracy. |
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 A-port, 12 mA B-port); no integrated B-port series resistors | Suitable for modern low-voltage systems but requires external termination for clean edges on B-bus | Select when migrating to 3.3-V infrastructure and external resistors are acceptable |
| SN74ABT245DBR | Same ABT family, identical pinout and specs, but lacks B-port 25-Ω series resistors | Requires discrete 25-Ω resistors on B outputs for equivalent signal integrity | Choose only if B-port termination is implemented externally and cost-per-resistor is justified |
Compared with SN74LVC2245APW and SN74ABT245DBR, the SN74ABT2245DBR uniquely integrates B-port 25-Ω series resistors-reducing component count and layout complexity-while maintaining full 5-V TTL compatibility and superior latch-up immunity, making it optimal for industrial bus isolation where signal integrity and robustness are critical.
Availability
SN74ABT2245DBR is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system bus isolation, and embedded data acquisition hubs requiring stable component supply and long-term manufacturability.
Supply support for SN74ABT2245DBR 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-grade ICs.
The SN74ABT2245DBR belongs to TI's ABT logic family, engineered for high-speed, robust bus interfacing in harsh environments-emphasizing noise immunity, power efficiency, and seamless integration with legacy 5-V systems.
FAQ
What is the operating temperature range for SN74ABT2245DBR?
The SN74ABT2245DBR is characterized for operation from –40°C to +85°C, meeting industrial-grade environmental requirements. This range is specified in the recommended operating conditions table of the SCBS234D datasheet and applies specifically to the SN74ABT2245DBR variant in the DB package. Operation outside this range may result in undefined behavior or reduced reliability.
Does SN74ABT2245DBR require external series resistors on the B-port outputs?
No, the SN74ABT2245DBR does not require external series resistors on the B-port outputs because it integrates equivalent 25-Ω series resistors internally. This feature is explicitly stated in the device description and functional overview of the SCBS234D datasheet and eliminates the need for discrete termination components, reducing BOM cost and PCB area.
What happens to SN74ABT2245DBR outputs during power-up?
When VCC is between 0 V and 2.1 V, the SN74ABT2245DBR automatically enters a high-impedance state on all outputs, preventing bus contention during power sequencing. However, to guarantee high-impedance above 2.1 V, OE must be tied to VCC through a pullup resistor-the minimum value depends on the driver's current-sourcing capability as noted in the datasheet.
What is the maximum sink current supported by the A-port outputs of SN74ABT2245DBR?
The A-port outputs of SN74ABT2245DBR support up to 64 mA sink current under recommended operating conditions (VCC = 4.5 V, TA = 25°C), as specified in the "Recommended Operating Conditions" table of the SCBS234D datasheet. This rating enables direct driving of heavier capacitive loads or longer traces without external buffering.
Is SN74ABT2245DBR pin-compatible with SN74ABT245DBR?
Yes, SN74ABT2245DBR is pin-compatible with SN74ABT245DBR-both use the same 20-pin DB package and identical pinout (DIR, A1–A8, GND, B1–B8, OE, VCC). However, SN74ABT2245DBR includes integrated 25-Ω series resistors on B-port outputs, whereas SN74ABT245DBR does not; this difference affects signal integrity design but not physical layout.
SN74ABT2245DBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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-SSOP
SN74ABT2245DBR FAQ
1.How can I place an order for SN74ABT2245DBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT2245DBR 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 SN74ABT2245DBR reliable?
The price and inventory of SN74ABT2245DBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT2245DBR is usually 5 days.
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Once your SN74ABT2245DBR 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 SN74ABT2245DBR?
For technical support, including SN74ABT2245DBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT2245DBR requirements.
6.How does Aetrix verify that SN74ABT2245DBR is sourced from the original manufacturer or authorized distributors?
All SN74ABT2245DBR 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 SN74ABT2245DBR meets industry standards.
7.What is the process for return or replacement of SN74ABT2245DBR?
All SN74ABT2245DBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT2245DBR, 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 SN74ABT2245DBR part is unused and in its original packaging.
Return procedure for SN74ABT2245DBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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