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Texas Instruments SN74ABT245BPW
- Part No.:
- SN74ABT245BPW
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74ABT245BPW.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,657
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Product details
Overview
SN74ABT245BPW from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous bidirectional data transfer between A and B buses in 5-V digital systems. It features high-drive capability (−32 mA IOH / 64 mA IOL), supports hot insertion via Ioff and power-up 3-state, and operates across −40°C to 85°C in a 20-pin TSSOP package.
For engineers reviewing the SN74ABT245BPW datasheet, SN74ABT245BPW pinout, SN74ABT245BPW application, or SN74ABT245BPW equivalent, key selection criteria include its 3.2 ns typical propagation delay (tPLH), 0.5 ns output skew (tsk(o)), ground-bounce immunity (<1 V VOLP), and compatibility with TTL- and CMOS-level control signals in memory expansion, peripheral interfacing, and bus isolation designs.
Technical Context
This device implements dual-directional 8-bit data routing controlled by DIR and OE inputs: when OE is low, data flows A→B (DIR = H) or B→A (DIR = L); when OE is high, both ports enter high-impedance state. The logic diagram confirms noninverting signal paths with no internal inversion on either bus side.
Its Ioff circuitry actively disables outputs at VCC = 0 V, limiting reverse current to ±100 µA, while power-up 3-state ensures outputs remain high-Z during supply ramp-up. Absolute maximum ratings include 7-V supply tolerance and −0.5 V to 5.5 V output voltage range under powered-down conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures stable operation across standard 5-V TTL/CMOS rails with ±5% supply tolerance. |
| IOH / IOL | −32 mA / 64 mA - Delivers robust drive strength for heavy capacitive loads and long trace routing without external buffers. |
| tPLH / tPHL | 0.8 ns to 3.6 ns (typ/max) - Enables sub-4 ns bidirectional propagation critical for high-speed address/data multiplexing. |
| VOLP (Ground Bounce) | <1 V at VCC = 5 V, TA = 25°C - Minimizes noise coupling into shared ground planes during simultaneous switching. |
| Ioff | ±100 µA at VCC = 0 - Prevents damaging backflow current during hot-plug or partial-power-down scenarios. |
| tsk(o) | 0.5 ns - Guarantees tight timing alignment across all eight channels, essential for parallel bus integrity. |
| ESD Protection | 2000-V HBM, 200-V MM - Meets industrial-grade ESD resilience without requiring external protection diodes. |
Pinout & Package
TSSOP-20 (PW) package: 4.4 mm × 6.5 mm body, 0.65 mm lead pitch, 1.2 mm max height, exposed thermal pad not present (non-VQFN). Pin 1 index located at top-left corner with beveled edge marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE (Output Enable) | Active-low global enable controlling 3-state output isolation for both A and B ports. |
| 2–9 | A1–A8 | Input/output port A - Bidirectional data lines connected to source bus (e.g., microcontroller data bus). |
| 10 | GND | Power ground reference for all internal logic and output drivers. |
| 11 | VCC | 5-V supply input powering internal logic and output stages. |
| 12–19 | B1–B8 | Input/output port B - Bidirectional data lines connected to destination bus (e.g., peripheral or memory bus). |
| 20 | DIR (Direction Control) | Logic-level selector determining data flow direction: H = A→B, L = B→A. |
Key Features
| Feature | Design Value |
|---|---|
| Hot-insertion support | Enabled by Ioff and power-up 3-state circuits - eliminates need for sequencing controllers during live board replacement. |
| High-drive outputs | −32 mA IOH / 64 mA IOL - Drives 50-pF loads at full speed without signal degradation or added gate count. |
| Latch-up immunity | >500 mA per JESD 17 - Withstands transient overcurrent events in noisy industrial environments. |
| Low ground bounce | <1 V VOLP at 5 V - Reduces simultaneous switching noise that could corrupt adjacent analog or clock signals. |
| Wide temperature range | −40°C to +85°C - Certified for reliable operation in commercial and extended-temperature embedded applications. |
Applications
| Memory Expansion Interface | Microcontroller Peripheral Bridge |
|---|---|
|
Use Scenario: Connecting an 8-bit microcontroller data bus to external SRAM or EPROM with separate address latching. IC Role / Device Role / Timing Role: Bidirectional data transceiver isolating MCU and memory buses, enabling shared data path with direction control synchronized to WR/RD strobes. Use Value: Eliminates need for discrete directional buffers and reduces PCB layer count by consolidating A/B bus routing into single 20-pin footprint. |
Use Scenario: Interfacing legacy 8-bit peripherals (e.g., UART, LCD controller) to modern microcontrollers with mismatched voltage or timing domains. IC Role / Device Role / Timing Role: Level-shifting and bus-isolation transceiver managing data flow direction based on peripheral handshake signals. Use Value: Provides deterministic 3-state control during peripheral reset or sleep modes, preventing bus contention without firmware intervention. |
| Backplane Data Multiplexer | Test Equipment Bus Isolator |
|
Use Scenario: Routing test data between multiple DUT slots and central controller in automated test equipment. IC Role / Device Role / Timing Role: High-speed bidirectional switch enabling time-multiplexed access to shared data lanes across independent subsystems. Use Value: Sub-4 ns propagation and 0.5 ns skew ensure precise timing alignment across all eight channels during high-frequency pattern generation. |
Use Scenario: Isolating functional test instrumentation from production boards during in-circuit programming or debug sessions. IC Role / Device Role / Timing Role: Controlled bus disconnect device activated only during active test cycles, maintaining high-Z state otherwise. Use Value: Ioff protection prevents backfeed damage when target board is unpowered, supporting safe "live" probe attachment and removal. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245APW | 3.3-V only operation (1.65–3.6 V), lower drive (−24/24 mA), 3.5 ns max tPLH, no Ioff. | Not suitable for 5-V systems or hot-swap; requires level-shifting if interfacing with 5-V logic. | Select when operating exclusively in 3.3-V domains and lower power consumption is prioritized over drive strength. |
| SN74AHCT245PW | 5-V tolerant inputs, TTL-compatible thresholds, 8 mA drive (−8/8 mA), 10 ns max tPLH, no Ioff. | Limited drive capability restricts use with >30 pF loads; lacks hot-insertion protection. | Choose for cost-sensitive 5-V designs where load capacitance is low and sequencing control is available. |
Compared with SN74LVC245APW and SN74AHCT245PW, the SN74ABT245BPW delivers superior 5-V drive strength, verified hot-swap capability, and tighter timing-making it the preferred choice for industrial backplanes, memory interfaces, and systems requiring robust bus isolation without external support circuitry.
Availability
SN74ABT245BPW is available at Aetrix Electronics and suitable for memory expansion, microcontroller peripheral bridging, backplane data multiplexing, and test equipment bus isolation requiring stable component supply across industrial temperature ranges.
Supply support for SN74ABT245BPW 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 experience in high-reliability interface IC design.
The SN74ABT245BPW belongs to TI's ABT logic family, engineered for high-speed 5-V bus interfacing with emphasis on noise immunity, hot-swap safety, and industrial temperature operation.
FAQ
What is the recommended pull-up resistor value for OE on SN74ABT245BPW?
Tie OE to VCC through a pull-up resistor to ensure high-impedance state during power-up. Minimum resistance is determined by the driver's current-sinking capability; TI recommends ≥10 kΩ for standard 5-V CMOS drivers, balancing noise immunity and current draw. This configuration guarantees safe startup behavior in systems lacking sequenced enable control.
Does SN74ABT245BPW support mixed-voltage operation between A and B ports?
No. SN74ABT245BPW is a 5-V-only device with VCC = 4.5–5.5 V. Both A and B ports operate at the same VCC-referenced logic levels; it does not provide level translation. Inputs tolerate up to 5.5 V, but outputs swing rail-to-rail relative to VCC, making it unsuitable for true 3.3-V ↔ 5-V translation without external circuitry.
How does the Ioff feature protect SN74ABT245BPW during hot insertion?
The Ioff circuitry disables all outputs when VCC = 0 V, limiting current flow through the device to ±100 µA even if A or B pins are driven externally. This prevents damaging back-current from live backplane traces into an unpowered board, satisfying hot-swap requirements without external FETs or sequencing logic.
Can SN74ABT245BPW be used in place of SN74ABT245BDW in the same PCB layout?
No. SN74ABT245BPW (TSSOP-20, 4.4 × 6.5 mm, 0.65 mm pitch) and SN74ABT245BDW (SOIC-20, 7.5 × 12.8 mm, 1.27 mm pitch) have incompatible footprints, land patterns, and thermal profiles. Direct substitution requires PCB redesign; mechanical dimensions and solder mask openings differ significantly per TI package drawings PW0020A and DW0020A.
What is the maximum capacitive load SN74ABT245BPW can drive while maintaining specified timing?
SN74ABT245BPW switching characteristics (tPLH/tPHL, tPZL/tPHZ) are characterized at CL = 50 pF. Driving loads beyond this increases propagation delay nonlinearly and may exceed 3.6 ns max tPLH. For reliable sub-4 ns performance, keep total trace + load capacitance ≤50 pF; heavier loads require derating or buffer staging.
SN74ABT245BPW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74ABT245BPW FAQ
1.How can I place an order for SN74ABT245BPW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT245BPW 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 SN74ABT245BPW reliable?
The price and inventory of SN74ABT245BPW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT245BPW is usually 5 days.
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SN74ABT245BPW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT245BPW 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 SN74ABT245BPW?
For technical support, including SN74ABT245BPW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT245BPW requirements.
6.How does Aetrix verify that SN74ABT245BPW is sourced from the original manufacturer or authorized distributors?
All SN74ABT245BPW 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 SN74ABT245BPW meets industry standards.
7.What is the process for return or replacement of SN74ABT245BPW?
All SN74ABT245BPW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT245BPW, 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 SN74ABT245BPW part is unused and in its original packaging.
Return procedure for SN74ABT245BPW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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