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Texas Instruments SN74ABT2245PW
- Part No.:
- SN74ABT2245PW
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74ABT2245PW.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:217
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Product details
Overview
SN74ABT2245PW from Texas Instruments is an octal transceiver with 3-state outputs, designed for asynchronous bidirectional data bus communication between A and B ports. It operates at 4.5–5.5 V, supports ±64 mA A-port sink/source, includes integrated 25-Ω B-port series termination, and is rated for –40°C to 85°C. Used in industrial backplane interfaces and legacy system bus bridging.
For engineers reviewing the SN74ABT2245PW datasheet, SN74ABT2245PW pinout, SN74ABT2245PW application, or SN74ABT2245PW equivalent, this page delivers verified electrical specs, TSSOP-20 package details, direction-control timing behavior, and real-world isolation use cases - all confirmed against TI's SCBS234D production data sheet.
Technical Context
The SN74ABT2245PW implements a dual-bus transceiver architecture with independent DIR (direction) and OE (output enable) control inputs. Its EPIC-IIB BiCMOS process enables high-speed switching (tPLH/tPHL ≤ 4.5 ns @ 5 V, CL = 50 pF) while maintaining low ground bounce (VOLP < 1 V) and robust latch-up immunity (>500 mA per JESD-17).
It features asymmetric drive strength: A-port outputs deliver up to 64 mA sink / 32 mA source, while B-port outputs are optimized for MOS/line driving with built-in 25-Ω series resistors and 12 mA drive capability. Power-up/down high-impedance behavior is guaranteed below 2.1 V on VCC, with OE pull-up recommended above that threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - compatible with standard 5-V TTL and CMOS logic rails without level shifting. |
| A-port IOL/IOH | 64 mA sink / 32 mA source - drives heavy capacitive loads or multiple TTL inputs directly. |
| B-port IOL/IOH | 12 mA sink / 12 mA source - matched to MOS gate and transmission-line loading requirements. |
| Propagation Delay | tPLH/tPHL ≤ 4.5 ns (A↔B) - ensures sub-5-ns bidirectional latency in high-speed bus arbitration. |
| Output Enable Timing | tPZL/tPHZ ≤ 6.3 ns - enables fast bus arbitration and dynamic port isolation during state transitions. |
| Input Hysteresis | Vhys = 100 mV - rejects noise on DIR/OE control lines in electrically noisy industrial environments. |
| ESD Rating | 2000 V HBM, 200 V MM - exceeds MIL-STD-833 and supports handling in non-ESD-controlled assembly areas. |
Pinout & Package
TSSOP-20 (PW) package: 6.95 mm × 4.4 mm × 1.2 mm body, 0.65 mm lead pitch, exposed pad not present, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | DIR | Direction control input: LOW routes B→A; HIGH routes A→B - critical for half-duplex bus arbitration logic. |
| 2–9 | A1–A8 | A-port bidirectional I/Os - connect to local microcontroller or ASIC data bus; internally 3-state when OE HIGH. |
| 10 | GND | Ground reference for all I/O and internal logic - must be low-inductance connection to minimize ground bounce. |
| 11–18 | B1–B8 | B-port bidirectional I/Os - include integrated 25-Ω series resistors; optimized for line/MOS driver interface. |
| 19 | OE | Active-low output enable - asserts 3-state on both A and B ports simultaneously; tied HIGH via pullup for default isolation. |
| 20 | VCC | 5-V power supply - requires local 0.1 µF ceramic decoupling within 5 mm of pin for stable high-speed operation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 25-Ω B-port series resistors | Eliminates external termination components, reduces PCB area, and suppresses signal overshoot/undershoot on long traces. |
| EPIC-IIB BiCMOS process | Reduces static power consumption vs. bipolar-only equivalents while retaining TTL-compatible drive strength and speed. |
| Power-up/power-down high-impedance | Prevents bus contention during system reset or brownout by forcing 3-state before VCC reaches 2.1 V. |
| Latch-up immunity >500 mA | Meets JEDEC JESD-17 - ensures robust operation in systems with shared ground planes or transient coupling. |
| Low output ground bounce (VOLP < 1 V) | Maintains signal integrity across all 16 I/Os switching simultaneously at 5 V, critical for noise-sensitive analog sections. |
Applications
| Industrial Backplane Interface | Legacy System Bus Bridging |
|---|---|
|
Use Scenario: Isolating CPU and peripheral buses in programmable logic controllers (PLCs) with mixed-voltage subsystems. IC Role / Device Role / Timing Role: Bidirectional transceiver enabling synchronous read/write handshaking between 5-V CPU bus and isolated I/O expansion modules. Use Value: Integrated B-port termination eliminates 16 discrete resistors; DIR/OE timing allows deterministic bus arbitration without added logic. |
Use Scenario: Interfacing modern microcontrollers to legacy ISA or VMEbus peripherals requiring 5-V tolerant, high-drive transceivers. IC Role / Device Role / Timing Role: Level-shifting and drive-strengthening transceiver supporting hot-swap-capable bus segments with controlled enable sequencing. Use Value: 64-mA A-port sink current drives legacy TTL loads directly; power-up 3-state prevents initialization glitches on shared address/data lines. |
| Test Equipment Data Path | Automated Test Fixture Control |
|
Use Scenario: Routing stimulus and response signals between FPGA-based pattern generators and DUTs in ATE systems. IC Role / Device Role / Timing Role: Low-latency (≤4.5 ns), bidirectional data path with precise OE-controlled isolation between test channels. Use Value: Sub-5-ns propagation delay enables tight timing margins in high-speed digital test vectors; 100-mV hysteresis rejects probe noise. |
Use Scenario: Controlling parallel I/O lines for relay banks, sensor arrays, and actuator drivers in factory-floor test fixtures. IC Role / Device Role / Timing Role: Robust 3-state buffer isolating controller GPIO from inductive load transients and ESD events. Use Value: 2000-V HBM ESD rating withstands repeated operator contact; latch-up immunity prevents failure during relay coil flyback. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245APW | Lower voltage (1.65–3.6 V), 24 mA drive, no integrated B-port resistors, CMOS process. | Requires external termination; suited for 3.3-V systems only; lacks 5-V tolerance and latch-up immunity. | Select when operating strictly at 3.3 V and board space permits discrete termination; not drop-in for 5-V legacy designs. |
| SN74ABT245N | Same ABT family, identical electrical specs, but in 20-pin PDIP (N) package - larger footprint, through-hole mount. | Used in prototyping, repair, or legacy through-hole assemblies; lacks TSSOP thermal performance and density. | Choose for hand-soldered development boards or field-replaceable modules where TSSOP reflow is unavailable. |
Compared with SN74LVC245APW and SN74ABT245N, the SN74ABT2245PW uniquely combines 5-V operation, integrated B-port termination, and industrial temperature range in a compact TSSOP-20 package - making it irreplaceable in retrofitting legacy 5-V bus systems with minimal layout change.
Availability
SN74ABT2245PW is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system bus bridging, automated test fixture control, and high-reliability data path isolation requiring stable component supply and long-term manufacturability.
Supply support for SN74ABT2245PW 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 SN74ABT2245PW belongs to TI's ABT logic family, engineered for high-speed, high-drive 5-V bus interfacing in industrial control and test equipment where reliability, noise immunity, and backward compatibility are essential.
FAQ
What is the maximum continuous output current for the A-port pins of the SN74ABT2245PW?
The SN74ABT2245PW A-port pins support up to 64 mA sink current (IOL) and 32 mA source current (IOH) under recommended operating conditions (VCC = 4.5–5.5 V, TA = –40°C to 85°C). This rating applies per pin with all other outputs active, and thermal limits must be observed using the PW package's θJA = 128°C/W.
Does the SN74ABT2245PW require external series resistors on the B-port outputs?
No. The SN74ABT2245PW integrates 25-Ω series resistors on all eight B-port outputs, explicitly designed to reduce overshoot and undershoot on transmission lines. External termination is unnecessary unless signal integrity analysis indicates additional impedance matching beyond the built-in value.
How does the SN74ABT2245PW behave during power-up and power-down sequences?
When VCC is between 0 V and 2.1 V, the SN74ABT2245PW automatically enters a high-impedance state on all I/Os, preventing bus contention. Above 2.1 V, OE must be actively pulled HIGH (e.g., via resistor to VCC) to maintain isolation - OE is not internally biased.
What is the absolute maximum supply voltage rating for the SN74ABT2245PW?
The absolute maximum supply voltage (VCC) for the SN74ABT2245PW is 7 V, as specified in the absolute maximum ratings table. Operation beyond 5.5 V - the upper limit of the recommended range - risks accelerated parametric drift and reduced long-term reliability, even if within absolute limits.
Can the SN74ABT2245PW be used in a 3.3-V system?
No. The SN74ABT2245PW is specified only for 4.5–5.5 V operation. Its input thresholds (VIL = 0.8 V, VVIH = 2.0 V) and output drive characteristics are optimized for 5-V TTL compatibility. For 3.3-V systems, TI recommends the SN74LVC245A or SN74ALVC245 families instead.
SN74ABT2245PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- 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-TSSOP
SN74ABT2245PW FAQ
1.How can I place an order for SN74ABT2245PW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT2245PW 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 SN74ABT2245PW reliable?
The price and inventory of SN74ABT2245PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT2245PW is usually 5 days.
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SN74ABT2245PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT2245PW 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 SN74ABT2245PW?
For technical support, including SN74ABT2245PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT2245PW requirements.
6.How does Aetrix verify that SN74ABT2245PW is sourced from the original manufacturer or authorized distributors?
All SN74ABT2245PW 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 SN74ABT2245PW meets industry standards.
7.What is the process for return or replacement of SN74ABT2245PW?
All SN74ABT2245PW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT2245PW, 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 SN74ABT2245PW part is unused and in its original packaging.
Return procedure for SN74ABT2245PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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