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Texas Instruments SN74LV245ADB
- Part No.:
- SN74LV245ADB
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74LV245ADB.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:9,560
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Product details
Overview
SN74LV245ADB from NXP Semiconductors is an octal 3-state non-inverting bus transceiver with direction control (DIR) and active-low output enable (OE), operating from 1.0 V to 5.5 V supply, supporting TTL-level inputs at VCC = 2.7–3.6 V, and rated for −40 °C to +125 °C. It enables bidirectional data flow between two 8-bit buses in industrial control backplanes and low-voltage microcontroller I/O expansion interfaces.
For engineers reviewing the SN74LV245ADB datasheet, SN74LV245ADB pinout, SN74LV245ADB application, or SN74LV245ADB equivalent, key selection criteria include its wide voltage range (1.0–5.5 V), guaranteed operation down to 1.0 V, −40 °C to +125 °C temperature rating, 3-state bus isolation capability, and compatibility with 74HC245/74HCT245 logic families.
Technical Context
The SN74LV245ADB implements a dual-bus bidirectional transceiver architecture using Si-gate CMOS technology, with DIR controlling data flow direction (A→B or B→A) and OE enabling/disabling all outputs simultaneously into high-impedance state. Its input structure accepts TTL-compatible thresholds when VCC is 2.7–3.6 V, ensuring interoperability with legacy 3.3 V logic systems.
Dynamic performance is characterized by propagation delay as low as 7 ns (VCC = 3.0–3.6 V, CL = 15 pF), enable/disable times under 23 ns, and low ground bounce (<0.8 V at VCC = 3.3 V). Static parameters include VIH/VIL thresholds defined across VCC = 1.2–5.5 V, and output drive capability of ±8 mA (VCC = 3.0 V) and ±16 mA (VCC = 4.5 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.0 V to 5.5 V - supports single-supply operation across 1.8 V, 2.5 V, 3.3 V, and 5 V logic domains without level shifters. |
| Operating Temperature | −40 °C to +125 °C - qualified for extended industrial and under-hood automotive-adjacent environments. |
| Propagation Delay | 7 ns typical (VCC = 3.3 V, CL = 15 pF) - enables reliable 100+ MHz bus operation in synchronous data transfer applications. |
| Output Drive Strength | ±8 mA at VCC = 3.0 V - sufficient to drive standard 50 pF loads across PCB traces without signal integrity degradation. |
| Input Threshold Compatibility | TTL-compatible at VCC = 2.7–3.6 V (VIH = 2.0 V min, VIL = 0.8 V max) - allows direct interfacing with 3.3 V microcontrollers and FPGAs. |
| ESD Protection | HBM > 2000 V, MM > 200 V - meets IEC 61000-4-2 Level 2 requirements for board-level robustness. |
| Power Dissipation Capacitance | CPD = 40 pF - enables accurate dynamic power estimation (PD = CPD × VCC² × fi × N) for thermal design. |
Pinout & Package
SN74LV245ADB is housed in a plastic shrink small outline package (SSOP20) with 20 leads and 5.3 mm body width (SOT339-1), optimized for high-density PCB layouts while maintaining hand-soldering feasibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DIR (Pin 1) | Direction control input | LOW enables A→B data flow; HIGH enables B→A - critical for configuring master/slave or host/peripheral bus roles. |
| A0–A7 (Pins 2–9) | Port A data I/O | 8-bit bidirectional interface connected to local controller or microprocessor bus; driven high-Z when OE = HIGH. |
| GND (Pin 10) | Ground reference | Primary return path for all internal logic and I/O currents; must be low-inductance connection to minimize ground bounce. |
| B0–B7 (Pins 11–18) | Port B data I/O | 8-bit bidirectional interface connected to peripheral bus or memory subsystem; isolated when OE = HIGH. |
| OE (Pin 19) | Active-low output enable | Drives all A/B outputs to high-impedance when HIGH - enables bus sharing and hot-swap-safe system partitioning. |
| VCC (Pin 20) | Positive supply | Single power rail for entire device; decoupling capacitor (100 nF ceramic) required within 5 mm of this pin. |
Key Features
| Feature | Design Value |
|---|---|
| Wide voltage operation | 1.0 V to 5.5 V supply range enables use across 1.8 V, 2.5 V, 3.3 V, and 5 V systems without external level translation. |
| TTL input compatibility | Guaranteed recognition of TTL logic levels (VIH ≥ 2.0 V, VIL ≤ 0.8 V) at VCC = 2.7–3.6 V - simplifies migration from 74LS/74ALS designs. |
| Low ground bounce | Typical <0.8 V at VCC = 3.3 V - reduces noise coupling into adjacent analog or RF circuits on shared PCB layers. |
| High-speed switching | Enable/disable times ≤23 ns (VCC = 3.0–3.6 V) - supports burst-mode data transfers and fast bus arbitration protocols. |
| Extended temperature grade | Rated from −40 °C to +125 °C - suitable for industrial automation controllers and transportation infrastructure electronics. |
Applications
| Industrial Backplane Interface | Microcontroller I/O Expansion |
|---|---|
|
Use Scenario: Isolating and translating data between a main CPU bus and modular I/O cards in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Bidirectional bus transceiver managing 8-bit parallel data flow between CPU and field I/O modules, with DIR set per card slot and OE controlled per module address decode. Use Value: Enables hot-swappable I/O modules via high-impedance isolation during insertion/removal, preventing bus contention and system lockup. |
Use Scenario: Extending GPIO count of a 32-bit ARM Cortex-M microcontroller to drive 16-segment LED displays and keypad scanning matrix. IC Role / Device Role / Timing Role: Octal transceiver buffering MCU port pins to external peripherals, with DIR fixed for unidirectional display data output and OE toggled for keypad scan row activation. Use Value: Provides 8-bit parallel drive capability at 3.3 V while maintaining MCU's native 1.8 V core voltage, eliminating need for discrete level-shifting ICs. |
| Legacy System Interfacing | Low-Voltage FPGA Companion |
|
Use Scenario: Connecting modern 3.3 V FPGAs to legacy 5 V parallel EEPROMs and flash memory in test equipment upgrade paths. IC Role / Device Role / Timing Role: Voltage-tolerant bus transceiver translating between 3.3 V FPGA I/O banks and 5 V memory address/data buses, with OE synchronized to memory access strobes. Use Value: Eliminates external voltage translators by accepting 5 V-tolerant inputs and driving 5 V-compliant outputs at VCC = 5 V, reducing BOM count and layout area. |
Use Scenario: Providing configurable 8-bit data path between Xilinx Artix-7 FPGA and external ADC/DAC evaluation boards operating at 1.8 V or 2.5 V. IC Role / Device Role / Timing Role: Low-voltage transceiver matching FPGA I/O bank voltage (1.8 V/2.5 V) while maintaining timing margins for 100 MHz sampling clock distribution. Use Value: Delivers sub-10 ns propagation delay at 1.8 V supply, preserving setup/hold timing for high-speed serial peripheral interfaces routed through parallel bus segments. |
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 | Lower ICC (max 10 µA vs. 160 µA), higher speed (tPD = 5.3 ns @ 3.3 V), but only rated to +85 °C. | Suitable for commercial-grade portable devices where ultra-low static power and speed outweigh extended temperature needs. | Select SN74LVC245APW when ambient temperature stays below +85 °C and sub-6 ns timing is required; avoid for industrial control cabinets. |
| 74ALVC245MTCX | Higher drive (±24 mA), faster tPD (4.2 ns), but narrower VCC range (1.65–3.6 V) and no TTL input compatibility. | Optimized for high-speed 3.3 V-only systems like DDR memory buffers, not mixed-voltage or legacy-TTL interfacing. | Choose 74ALVC245MTCX only for 3.3 V FPGA-to-FPGA interconnects requiring maximum drive strength; not for 5 V or TTL integration. |
Compared with SN74LVC245APW and 74ALVC245MTCX, the SN74LV245ADB uniquely balances wide voltage support (1.0–5.5 V), extended temperature rating (−40 °C to +125 °C), and TTL input compatibility - making it the only option among the three for ruggedized 5 V legacy upgrades and industrial backplane designs.
Availability
SN74LV245ADB is available at Aetrix Electronics and suitable for industrial automation backplanes, microcontroller I/O expansion modules, and legacy-system interface adapters requiring stable component supply across extended temperature ranges and mixed-voltage environments.
Supply support for SN74LV245ADB 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
NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The SN74LV245ADB belongs to NXP's 74LV logic family, designed specifically for low-voltage, high-noise-immunity digital interfacing in industrial control, instrumentation, and embedded systems where reliability across wide temperature and supply ranges is critical.
FAQ
What is the minimum supply voltage at which SN74LV245ADB guarantees full functionality?
The SN74LV245ADB guarantees full functionality down to 1.0 V supply voltage, with static characteristics specified from VCC = 1.2 V and functional operation confirmed at VCC = 1.0 V when inputs are at GND or VCC. This enables use in ultra-low-power battery-backed systems and energy-harvesting applications where supply rails dip below 1.2 V.
Does SN74LV245ADB support TTL-level inputs at 3.3 V supply?
Yes, SN74LV245ADB supports TTL-level inputs when VCC is between 2.7 V and 3.6 V, with guaranteed VIH ≥ 2.0 V and VIL ≤ 0.8 V. This allows direct connection to legacy 3.3 V TTL outputs without level-shifting circuitry, simplifying upgrades of older 74LS-based systems.
Can SN74LV245ADB operate at 5 V supply while driving 5 V logic loads?
Yes, SN74LV245ADB operates up to 5.5 V supply and delivers VOH ≥ 4.3 V and VOL ≤ 0.2 V at VCC = 4.5 V with 8 mA load, meeting 5 V TTL and CMOS input thresholds. Its absolute maximum VCC rating is +7.0 V, providing margin against transient overvoltage events.
What is the thermal derating behavior of SN74LV245ADB in SSOP20 package?
In the SSOP20 (SOT339-1) package, SN74LV245ADB's total power dissipation (Ptot) derates linearly at 5.5 mW/K above +60 °C ambient. At +125 °C, maximum allowable Ptot drops to approximately 315 mW from the 500 mW rating at +25 °C, requiring careful thermal design in sealed enclosures.
How does the SN74LV245ADB handle bus contention during direction switching?
The SN74LV245ADB avoids bus contention by maintaining output high-impedance during DIR transitions when OE is asserted (LOW), as confirmed by function table entries showing Z-state outputs when OE = HIGH regardless of DIR state. This ensures clean direction reversal without short-circuit current spikes between A and B ports.
SN74LV245ADB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LV
- Package/Case:
- 20-SSOP (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:
- 16mA, 16mA
- Voltage - Supply:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
SN74LV245ADB FAQ
1.How can I place an order for SN74LV245ADB through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LV245ADB 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 SN74LV245ADB reliable?
The price and inventory of SN74LV245ADB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV245ADB is usually 5 days.
3.What payment methods are accepted for SN74LV245ADB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LV245ADB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LV245ADB?
SN74LV245ADB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LV245ADB 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 SN74LV245ADB?
For technical support, including SN74LV245ADB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV245ADB requirements.
6.How does Aetrix verify that SN74LV245ADB is sourced from the original manufacturer or authorized distributors?
All SN74LV245ADB 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 SN74LV245ADB meets industry standards.
7.What is the process for return or replacement of SN74LV245ADB?
All SN74LV245ADB units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV245ADB, 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 SN74LV245ADB part is unused and in its original packaging.
Return procedure for SN74LV245ADB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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