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Texas Instruments SN74LVT245BNS
- Part No.:
- SN74LVT245BNS
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74LVT245BNS.pdf
- Description:
- IC BUS TRANSCEIVER 8BIT 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:22,720
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Product details
Overview
SN74LVT245BNS from Fairchild Semiconductor is a low-voltage octal bidirectional transceiver with 3-STATE inputs/outputs, designed for bus interface between 3.3V logic and 5V TTL systems. It features transmit/receive direction control (T/R), output enable (OE), ±32mA/±64mA drive capability, and operates across –40°C to +85°C at 2.7–3.6V VCC. Used in backplane data routing and mixed-voltage board-level interconnects.
For engineers reviewing the SN74LVT245BNS datasheet, SN74LVT245BNS pinout, SN74LVT245BNS application, or SN74LVT245BNS equivalent, key selection criteria include bidirectional bus isolation, 3-STATE timing (tPZH ≤ 7.1 ns), bushold-free input behavior, and SOIC-20 package compatibility with JEDEC MS-013 footprint.
Technical Context
The SN74LVT245BNS implements eight non-inverting bidirectional buffers with independent 3-STATE control via OE and directional control via T/R. Its BiCMOS process enables ABT-class speed (tPLH/tPHL ≤ 4.0 ns) while maintaining 3.3V supply operation and 5V-tolerant I/O.
Logic operation follows strict truth table behavior: OE = HIGH forces A/B ports into high-impedance; OE = LOW enables bidirectional flow - T/R = LOW routes B→A, T/R = HIGH routes A→B. Power-up/down high-impedance prevents bus glitches during supply ramping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - Ensures stable operation in standard 3.3V systems with ±0.3V margin. |
| IOL / IOH | 64 mA / –32 mA - Supports driving heavy capacitive loads or multiple TTL inputs without external buffers. |
| tPZH / tPLZ | Max 7.1 ns / 5.1 ns - Defines maximum delay from OE transition to valid output state, critical for synchronous bus arbitration. |
| VIH / VIL | 2.0 V / 0.8 V - Guarantees reliable recognition of 5V TTL HIGH/LOW levels when interfacing legacy systems. |
| ICCZ | 0.19 mA - Quiescent supply current with outputs disabled, enabling low-power standby in idle bus states. |
| CIN / COUT | 4 pF / 8 pF - Low input/output capacitance minimizes signal distortion and timing skew on high-speed buses. |
| Operating Temp | –40°C to +85°C - Validated for industrial temperature range deployment without derating. |
Pinout & Package
SN74LVT245BNS is housed in a 20-lead Small Outline Integrated Circuit (SOIC) package per JEDEC MS-013, 0.300" wide, with standard 1.27 mm pitch and gull-wing leads. Pin 1 is marked by a notch or beveled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable Input | Active-HIGH control: asserts 3-STATE on both A and B ports when HIGH; enables bidirectional flow when LOW. |
| 2–9 (A0–A7) | Side A I/O Terminals | Bidirectional data lines connected to local 3.3V bus; present high-impedance when OE = HIGH or direction blocked. |
| 10 (GND) | Ground Reference | Primary return path for all internal logic and output drivers; must be low-inductance connection. |
| 11–18 (B0–B7) | Side B I/O Terminals | Bidirectional data lines connected to external 5V TTL bus; tolerate VI up to 5.5V regardless of VCC. |
| 19 (T/R) | Transmit/Receive Control | Direction selector: HIGH enables A→B flow; LOW enables B→A flow - only active when OE = LOW. |
| 20 (VCC) | Supply Voltage | 3.3V power rail; decoupling capacitor (0.1 µF ceramic) required within 10 mm of this pin. |
Key Features
| Feature | Design Value |
|---|---|
| 5V-tolerant I/O | Supports direct connection to 5V TTL buses without level shifters, reducing BOM count and layout complexity. |
| Glitch-free power sequencing | High-impedance during VCC ramp-up/down eliminates bus contention and transient loading during system startup/shutdown. |
| Live insertion/extraction support | Enables hot-swap capability in modular backplanes and field-replaceable line cards without system interruption. |
| High drive strength | ±32mA/±64mA output sourcing/sinking meets or exceeds standard TTL fan-out requirements (up to 10 LSTTL loads). |
| Latch-up immunity | Exceeds 500 mA per JEDEC JESD78, ensuring robustness against accidental bus overvoltage or ground bounce events. |
Applications
| Industrial Backplane Interface | Embedded Controller Bus Extension |
|---|---|
Use Scenario: Interfacing a 3.3V ARM-based controller module to a legacy 5V VMEbus backplane in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional voltage-level translator and bus driver, isolating domains while preserving signal integrity and timing alignment. Use Value: Eliminates need for discrete level-shifting ICs and reduces propagation delay uncertainty versus multi-stage solutions. |
Use Scenario: Extending GPIO and address/data bus signals from an FPGA carrier board to peripheral mezzanine cards operating at different voltage rails. IC Role / Device Role / Timing Role: Direction-controlled bus repeater with 3-STATE isolation, synchronized to system clock domain via OE/T/R timing. Use Value: Enables modular hardware design with plug-and-play card compatibility across mixed-voltage subsystems. |
| Telecom Line Card Data Routing | Test Equipment Signal Conditioning |
Use Scenario: Routing configuration and status data between a 3.3V management processor and 5V analog front-end ASICs in optical line terminals. IC Role / Device Role / Timing Role: Controlled-direction transceiver managing bidirectional register access and interrupt signaling across voltage domains. Use Value: Provides deterministic timing (tPZH ≤ 7.1 ns) for real-time fault reporting and avoids metastability in asynchronous handshaking. |
Use Scenario: Isolating DUT signals from automated test equipment controllers during functional testing of mixed-voltage PCBAs. IC Role / Device Role / Timing Role: Reconfigurable bus buffer enabling safe signal injection and capture without back-driving powered-down DUT sections. Use Value: Prevents damage from inadvertent voltage backfeed and supports live probing with guaranteed high-Z isolation when OE is asserted. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVTH245WM | Includes bushold inputs; otherwise identical electrical specs and pinout. | Eliminates need for external pull-ups on unused inputs; preferred where input floating is a concern. | Select SN74LVT245BNS when bushold is unnecessary and cost sensitivity favors base LVT variant. |
| SN74ALVC245DBR | Lower ICCZ (0.1 µA vs. 0.19 mA); same SOIC-20 package; 1.65–3.6V VCC range. | Better suited for ultra-low-power portable systems; lacks 5V-tolerant inputs (max VI = 3.6V). | Choose SN74LVT245BNS for 5V-TTL interoperability; choose ALVC version only if full 5V I/O tolerance is not required. |
Compared with 74LVTH245WM and SN74ALVC245DBR, the SN74LVT245BNS offers optimal balance of 5V-tolerant I/O, industrial temperature rating, and proven reliability in bus-critical infrastructure - without bushold overhead or reduced voltage range limitations.
Availability
SN74LVT245BNS is available at Aetrix Electronics and suitable for industrial backplane interfaces, embedded controller bus extensions, telecom line card data routing, and test equipment signal conditioning requiring stable component supply and long-term lifecycle assurance.
Supply support for SN74LVT245BNS 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in power management, signal conditioning, and interface ICs before its acquisition by ON Semiconductor in 2016.
The SN74LVT245BNS belongs to Fairchild's LVT logic family, engineered for high-speed, low-voltage bus interfacing in mixed-voltage industrial and telecom systems where reliability and timing predictability are critical.
FAQ
What is the maximum data rate supported by SN74LVT245BNS?
The SN74LVT245BNS does not specify a maximum data rate in MHz, but its propagation delays (tPLH/tPHL ≤ 4.0 ns at 3.3V) and output skew (≤1.0 ns) support reliable operation up to ~100 Mbps in well-terminated point-to-point or lightly loaded multidrop bus configurations. System-level timing margins must account for board trace length and load capacitance.
Does SN74LVT245BNS have bushold functionality on its inputs?
No, SN74LVT245BNS does not include bushold circuitry. That feature is exclusive to the LVTH variant (e.g., 74LVTH245). Inputs on SN74LVT245BNS require external pull-up or pull-down resistors if left unconnected to prevent floating states and potential noise-induced switching.
Can SN74LVT245BNS safely interface with 5V logic without external level shifters?
Yes, SN74LVT245BNS supports 5V-tolerant inputs: VI can reach 5.5V regardless of VCC (2.7–3.6V), and outputs drive standard TTL loads. This allows direct connection to 5V buses without additional level translation components, provided VCC remains within its rated range.
What is the recommended decoupling for SN74LVT245BNS?
A 0.1 µF ceramic capacitor placed within 10 mm of the VCC pin (Pin 20) and GND pin (Pin 10) is mandatory. For systems with high-frequency switching or multiple transceivers, add a bulk 4.7 µF tantalum or aluminum electrolytic capacitor near the power entry point to suppress low-frequency ripple.
Is SN74LVT245BNS compatible with lead-free reflow soldering processes?
Yes, SN74LVT245BNS is lead-free compliant per JEDEC J-STD-020B and qualified for standard Pb-free reflow profiles, including peak temperatures up to 260°C. The SOIC package (M20B) is rated for moisture sensitivity level (MSL) 1, eliminating bake requirements prior to assembly.
SN74LVT245BNS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVT
- Package/Case:
- 20-SOIC (0.209", 5.30mm 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
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
SN74LVT245BNS FAQ
1.How can I place an order for SN74LVT245BNS through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVT245BNS 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 SN74LVT245BNS reliable?
The price and inventory of SN74LVT245BNS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVT245BNS is usually 5 days.
3.What payment methods are accepted for SN74LVT245BNS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVT245BNS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVT245BNS?
SN74LVT245BNS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVT245BNS 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 SN74LVT245BNS?
For technical support, including SN74LVT245BNS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVT245BNS requirements.
6.How does Aetrix verify that SN74LVT245BNS is sourced from the original manufacturer or authorized distributors?
All SN74LVT245BNS 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 SN74LVT245BNS meets industry standards.
7.What is the process for return or replacement of SN74LVT245BNS?
All SN74LVT245BNS units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVT245BNS, 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 SN74LVT245BNS part is unused and in its original packaging.
Return procedure for SN74LVT245BNS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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