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Texas Instruments SN74LV245ATPWT
- Part No.:
- SN74LV245ATPWT
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LV245ATPWT.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,360
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Product details
Overview
SN74LV245AT from Texas Instruments is an octal bus transceiver with 3-state outputs, designed for asynchronous two-way data communication between A and B buses in industrial and embedded systems. It operates from 4.5 V to 5.5 V, delivers typical propagation delay of 3.5 ns at 5 V, supports mixed-mode voltage operation on all ports, and features Ioff partial-power-down protection. It is used in bidirectional data buffering applications such as microcontroller-to-peripheral interfacing.
For engineers reviewing the SN74LV245AT datasheet, SN74LV245AT pinout, SN74LV245AT application, or SN74LV245AT equivalent, key selection criteria include direction-control logic behavior, 3-state output isolation timing (tPZH/tPLZ), VCC operating range compatibility, and thermal performance across SSOP/TVSOP/TSSOP/VQFN package variants.
Technical Context
The SN74LV245AT implements dual-directional 8-bit data flow controlled by DIR (direction) and OE (output enable) inputs. DIR determines data path direction (A→B or B→A), while OE independently places all outputs in high-impedance state regardless of DIR state. The device uses TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V) and supports mixed-voltage signaling between 3.3-V and 5-V domains.
Its Ioff circuitry disables outputs during power-down, preventing backflow current when VCC = 0 V, and latch-up performance exceeds 250 mA per JESD 17. Absolute maximum ratings allow VI/VO up to 7 V, enabling robust handling of transient overvoltage conditions without damage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures stable operation across standard 5-V supply rails with ±5% tolerance. |
| tpd (Typical) | 3.5 ns at 5 V - Enables high-speed bidirectional data transfer in timing-critical interfaces like memory expansion or FPGA I/O bridging. |
| Ioff Support | Active at VCC = 0 V - Allows safe hot-insertion and partial-power-down system architectures without signal contention. |
| tPZH / tPLZ (Max) | 16.3 ns / 16.9 ns (CL = 15 pF) - Defines worst-case disable timing for precise bus isolation control in synchronous systems. |
| VOHV / VOLP | >2.3 V undershoot / <0.8 V ground bounce at 5 V - Reduces switching noise coupling into adjacent signal paths and power rails. |
| Operating Temp | –40°C to +125°C - Qualified for extended industrial and automotive under-hood environments. |
| ESD Rating | 2000-V HBM, 1000-V CDM - Meets stringent electrostatic discharge immunity requirements for manufacturing and field use. |
Pinout & Package
SN74LV245AT is available in five surface-mount packages: SSOP (DB), TVSOP (DGV), SOIC (DW), TSSOP (PW), and VQFN (RGY), all with 20 pins and identical pin mapping. The RGY variant includes an exposed thermal pad requiring PCB soldering for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIR | Direction control input | High = A→B data flow; Low = B→A; determines real-time bidirectional path without internal latching. |
| OE | Output enable input | Low = outputs active; High = all eight outputs enter high-impedance state, isolating both buses. |
| A1–A8 | Port A data inputs/outputs | 8-bit bidirectional port connected to one bus segment; driven or received depending on DIR and OE states. |
| B1–B8 | Port B data inputs/outputs | 8-bit bidirectional port connected to second bus segment; complementary to A-port in transceiver function. |
| VCC | Power supply | Single 4.5–5.5 V supply powers all logic and I/O; no separate Vref or auxiliary supplies required. |
| GND | Ground reference | Common return path for all signals and supply current; requires low-inductance PCB connection for noise control. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | VIH = 2 V, VIL = 0.8 V - Interoperates directly with legacy 5-V TTL logic without level-shifting circuitry. |
| Mixed-mode voltage operation | Supports 3.3-V and 5-V signaling on A/B ports simultaneously - Enables seamless interface between disparate voltage-domain subsystems. |
| Low ground bounce (VOLP) | <0.8 V at VCC = 5 V - Minimizes simultaneous switching noise that could corrupt adjacent digital or analog signals. |
| High-impedance power-up state | OE tied to VCC via pullup ensures Hi-Z at power-on - Prevents bus contention during system initialization sequences. |
| Latch-up immunity | >250 mA per JESD 17 - Guarantees robustness against accidental current injection events in noisy industrial environments. |
Applications
| Industrial PLC Backplane Interface | Microcontroller I/O Expansion |
|---|---|
|
Use Scenario: Bidirectional data exchange between CPU module and I/O expansion cards in modular programmable logic controllers. IC Role / Device Role / Timing Role: Octal transceiver buffers address/data bus lines, isolating modules during hot-swap or fault conditions using OE-controlled 3-state outputs. Use Value: Enables deterministic bus arbitration and prevents signal contention during card insertion/removal, supported by Ioff and –40°C to +125°C operation. |
Use Scenario: Extending GPIO count of a 3.3-V microcontroller to drive 5-V peripherals such as displays, sensors, or actuators. IC Role / Device Role / Timing Role: Level-translating transceiver providing direction-controlled data flow between MCU and external 5-V devices. Use Value: Eliminates need for discrete level shifters; mixed-mode operation allows direct connection to both 3.3-V and 5-V logic families. |
| FPGA Configuration Bus Isolation | Legacy Peripheral Bridging |
|
Use Scenario: Isolating FPGA configuration memory bus from active system operation during reconfiguration cycles. IC Role / Device Role / Timing Role: Direction-controlled buffer placed between FPGA and parallel Flash ROM, disabled via OE during bitstream loading. Use Value: Prevents read conflicts and bus contention during partial reconfiguration; fast tPZH/tPLZ ensures minimal dead time. |
Use Scenario: Interfacing modern ARM-based SoC with legacy parallel peripherals (e.g., printers, scanners) requiring 5-V tolerant signaling. IC Role / Device Role / Timing Role: Bidirectional data highway supporting handshaking protocols like STROBE/ACK with precise timing control. Use Value: Delivers sub-4 ns typical propagation delay and TTL-compatible thresholds essential for reliable timing margin in legacy parallel interfaces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC245A | Wider VCC range (1.65–3.6 V), lower 3.3-V propagation delay (~3.1 ns), but no 5-V operation support. | Optimized for 3.3-V-only systems; unsuitable where 5-V compatibility or mixed-voltage operation is required. | Select SN74LVC245A only if full 5-V operation is unnecessary and lower supply voltage is mandatory. |
| 74ALVC245 | Higher speed (tpd ~2.3 ns at 3.3 V), same 1.65–3.6 V range, but lacks Ioff and extended temperature rating. | Targeted at high-speed 3.3-V applications with less demanding reliability or power-down requirements. | Choose 74ALVC245 for speed-critical 3.3-V designs where industrial temp range and Ioff are not needed. |
Compared with SN74LVC245A and 74ALVC245, the SN74LV245AT uniquely supports 4.5–5.5 V operation, mixed-mode voltage translation, and Ioff-enabled partial-power-down-making it the only option among the three qualified for legacy 5-V industrial systems requiring robust hot-swap capability.
Availability
SN74LV245AT is available at Aetrix Electronics and suitable for industrial automation, embedded controller design, and FPGA peripheral interfacing requiring stable component supply across multiple package types including SSOP, TVSOP, SOIC, TSSOP, and VQFN.
Supply support for SN74LV245AT 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 connectivity technologies, with decades of experience in industrial-grade logic and interface solutions.
The SN74LV245AT belongs to TI's LV family of low-voltage, high-speed logic devices engineered specifically for robust bidirectional data buffering in harsh industrial environments and mixed-voltage system integration.
FAQ
What is the recommended power-up sequence for SN74LV245AT to avoid bus contention?
To prevent bus contention during power-up, tie OE to VCC through a pullup resistor (minimum value determined by driver sink capability). This ensures all outputs remain in high-impedance state until system firmware asserts valid DIR and OE logic levels. The SN74LV245AT's design inherently supports this behavior, and the datasheet specifies this practice for safe initialization. Always verify resistor value against the driving source's current-sinking specification before final layout.
Does SN74LV245AT support true level shifting between 3.3-V and 5-V logic domains?
Yes, SN74LV245AT supports mixed-mode voltage operation on all ports: inputs accept 3.3-V or 5-V signals, and outputs drive to corresponding logic-high levels based on VCC (4.5–5.5 V). When VCC = 5 V, it reliably interfaces with 3.3-V CMOS outputs (VIH = 2 V min) and drives 5-V TTL loads (VOH ≥ 3.8 V at 16 mA). This eliminates external level shifters in many cross-voltage applications.
What is the maximum capacitive load SN74LV245AT can drive while maintaining specified timing?
The SN74LV245AT switching characteristics are characterized at CL = 15 pF and CL = 50 pF. At 50-pF load, typical tPLH/tPHL increases to 5.4 ns and max reaches 10.7 ns. For designs exceeding 50 pF, timing margins must be recalculated using the device's output drive strength (±16 mA) and board-level signal integrity analysis. The SN74LV245AT does not specify performance beyond 50 pF in official characterization.
How does Ioff functionality protect SN74LV245AT during partial power-down?
Ioff disables all outputs when VCC = 0 V, blocking current flow from live A/B bus lines into the unpowered device. This prevents damaging backfeed current and maintains signal integrity on powered sections of the system. The SN74LV245AT guarantees Ioff ≤ 5 µA across –40°C to +125°C, making it suitable for hot-swap and modular power architecture designs where subsystems power up/down independently.
Which package options for SN74LV245AT include an exposed thermal pad?
Only the VQFN (RGY) package variant of SN74LV245AT includes an exposed thermal pad (Pin 21), which must be soldered to a PCB thermal plane for optimal junction-to-board thermal resistance (θJB = 37°C/W). SSOP (DB), TVSOP (DGV), SOIC (DW), and TSSOP (PW) packages do not feature exposed pads. Thermal design guidance for RGY is provided in TI literature SLUA271.
SN74LV245ATPWT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LV
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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:
- 16mA, 16mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74LV245ATPWT FAQ
1.How can I place an order for SN74LV245ATPWT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LV245ATPWT 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 SN74LV245ATPWT reliable?
The price and inventory of SN74LV245ATPWT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV245ATPWT is usually 5 days.
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Once your SN74LV245ATPWT 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 SN74LV245ATPWT?
For technical support, including SN74LV245ATPWT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV245ATPWT requirements.
6.How does Aetrix verify that SN74LV245ATPWT is sourced from the original manufacturer or authorized distributors?
All SN74LV245ATPWT 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 SN74LV245ATPWT meets industry standards.
7.What is the process for return or replacement of SN74LV245ATPWT?
All SN74LV245ATPWT units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV245ATPWT, 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 SN74LV245ATPWT part is unused and in its original packaging.
Return procedure for SN74LV245ATPWT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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