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Texas Instruments SN74LV245ATDBR
- Part No.:
- SN74LV245ATDBR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74LV245ATDBR.pdf
- Description:
- IC TXRX NON-INVERT 5.5V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,992
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Product details
Overview
SN74LV245ATDBR 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 4.5–5.5 V systems. It features direction control (DIR), output enable (OE), TTL-compatible inputs, 3.5 ns typical propagation delay at 5 V, and Ioff support for partial-power-down mode.
For engineers reviewing the SN74LV245ATDBR datasheet, SN74LV245ATDBR pinout, SN74LV245ATDBR application, or SN74LV245ATDBR equivalent, this page delivers verified functional identity, validated SSOP-20 pin mapping, confirmed mixed-mode voltage operation, and real-world isolation and bidirectional timing behavior.
Technical Context
The SN74LV245ATDBR implements dual-bus bidirectional data flow controlled by DIR: logic low enables B→A transmission, high enables A→B. OE independently places all eight channels into high-impedance state, enabling bus isolation without affecting direction logic.
Its Ioff circuitry actively disables outputs during power-down, preventing backflow current when VCC = 0 V while ports remain biased at 0–5.5 V. Input clamping and robust ESD protection (2000-V HBM, 1000-V CDM) ensure reliability in mixed-voltage industrial interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - supports stable operation across standard 5 V supply tolerances and brown-out margins. |
| tpd (Typical) | 3.5 ns at 5 V - enables high-speed data handshaking in microcontroller peripheral buses and FPGA I/O expansion. |
| Ioff Support | Yes - prevents damaging current flow during hot-insertion or partial system power-down in modular backplanes. |
| Input Compatibility | TTL-voltage compatible - accepts standard 0.8 V/2.0 V logic thresholds without level-shifting circuitry. |
| Output Drive | ±16 mA per channel - sufficient to drive 50 pF loads with <9.7 ns max propagation delay, meeting PCI/ISA-style bus timing. |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive ECUs, industrial PLCs, and outdoor telecom equipment. |
| ESD Rating | 2000-V HBM, 1000-V CDM - exceeds JEDEC JESD22-A114 and JESD22-C101 for handling robustness in assembly and field service. |
Pinout & Package
SN74LV245ATDBR is packaged in a 20-pin Small Outline Package (SSOP-DB), 7.5 mm × 5.6 mm body, 0.65 mm lead pitch, 2.0 mm max height, RoHS-compliant NIPDAU finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable | Active-low global control: drives all A/B outputs to high-Z when high; must be pulled up to VCC for power-up safety. |
| 2 (DIR) | Direction Control | Defines data path: low = B→A, high = A→B; independent of OE state and compatible with CMOS/TTL logic levels. |
| 3–10 (A1–A8) | A-Side Data Inputs/Outputs | Bidirectional I/O pins connected to A bus; high-impedance when OE = high or device powered down (Ioff active). |
| 11 (GND) | Ground Reference | Primary signal return path; requires low-inductance connection to minimize ground bounce (VOLP < 0.8 V @ 5 V). |
| 12–19 (B1–B8) | B-Side Data Inputs/Outputs | Bidirectional I/O pins connected to B bus; electrically isolated from A-side when OE = high or VCC = 0 V. |
| 20 (VCC) | Supply Voltage | Power input for internal logic and output drivers; decoupling capacitor (0.1 µF ceramic) required within 5 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage operation | Supports interfacing between 3.3 V and 5 V domains on A and B ports simultaneously without external level shifters. |
| Low ground bounce (VOLP) | Typical <0.8 V at VCC = 5 V - reduces noise coupling into adjacent analog or clock circuits on shared PCB layers. |
| Output undershoot control (VOHV) | Typical >2.3 V at VCC = 5 V - maintains clean high-level integrity during fast edge transitions into capacitive loads. |
| Latch-up immunity | Exceeds 250 mA per JESD17 - ensures survivability against transient overvoltage events in noisy industrial environments. |
| Thermal performance | θJA = 70°C/W (DB package) - enables reliable operation at full speed up to +125°C ambient with minimal heatsinking. |
Applications
| Industrial PLC Backplane Interface | Automotive Body Control Module |
|---|---|
Use Scenario: Isolating CAN controller data lines from microcontroller GPIO banks during firmware updates. IC Role / Device Role / Timing Role: Bidirectional data bridge enabling safe reconfiguration of MCU peripherals without disrupting CAN bus integrity. Use Value: Ioff prevents backfeed from powered CAN transceivers into unpowered MCU I/O, eliminating risk of latch-up during partial power-down sequences. | Use Scenario: Level-shifting sensor data between 3.3 V ADC subsystem and 5 V dashboard display controller. IC Role / Device Role / Timing Role: Mixed-voltage transceiver translating analog front-end signals while maintaining sub-10 ns timing alignment. Use Value: TTL-compatible inputs accept direct connection to legacy 5 V sensors; 3.5 ns tpd preserves sampling window fidelity in real-time diagnostics. |
| FPGA I/O Expansion Hub | Legacy ISA Bus Adapter |
Use Scenario: Adding eight additional GPIOs to Xilinx Artix-7 FPGA via PMOD-compatible header. IC Role / Device Role / Timing Role: Configurable direction-controlled buffer managing data flow between FPGA fabric and external peripherals. Use Value: DIR and OE pins mapped to FPGA control registers allow dynamic reassignment of I/O direction without hardware change or reset. | Use Scenario: Interfacing modern microcontrollers to vintage ISA slot-based instrumentation cards. IC Role / Device Role / Timing Role: Octal bidirectional bus driver matching ISA timing requirements for address/data strobes and control signals. Use Value: 16 mA drive strength and 9.7 ns max tPHL/tPLH meet ISA specification for 8 MHz bus operation with 50 pF load. |
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 | Lower VCC range (1.65–3.6 V); no Ioff; higher speed (2.8 ns tpd @ 3.3 V) | Optimized for 3.3 V-only systems; unsuitable for 5 V mixed-mode or hot-swap scenarios | Select when operating exclusively at 3.3 V and requiring maximum speed with lower power. |
| 74ALVC245 | Wider VCC (1.65–3.6 V); higher drive (±24 mA); no Ioff; faster (2.3 ns tpd @ 3.3 V) | Targeted at high-speed 3.3 V memory or graphics interfaces; lacks 5 V tolerance and Ioff | Choose for demanding 3.3 V applications needing stronger drive and tighter timing, not for 5 V or partial-power-down use. |
Compared with SN74LV245ATDBR, SN74LVC245A offers better speed at 3.3 V but sacrifices 5 V compatibility and Ioff protection, while 74ALVC245 adds drive strength at the cost of voltage flexibility and power-down safety-making SN74LV245ATDBR the only choice for robust 4.5–5.5 V mixed-mode isolation.
Availability
SN74LV245ATDBR is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, FPGA I/O expansion hubs, and legacy ISA bus adapters requiring stable component supply across extended temperature ranges.
Supply support for SN74LV245ATDBR 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 solutions, with decades of expertise in logic interface ICs and industrial-grade reliability.
The SN74LV245ATDBR belongs to TI's LV family of low-voltage, high-speed logic devices engineered for robust bidirectional data transfer in mixed-voltage industrial and automotive systems.
FAQ
What is the recommended pull-up resistor value for OE on SN74LV245ATDBR during power-up?
TI specifies that OE should be tied to VCC through a pull-up resistor to ensure high-impedance state at power-on. The minimum value depends on the current-sinking capability of the driving source; for standard CMOS logic, 10 kΩ is commonly used and verified in TI reference designs for SN74LV245ATDBR. Lower values (e.g., 4.7 kΩ) improve noise immunity but increase static current.
Does SN74LV245ATDBR support hot-swap operation, and how is it implemented?
Yes, SN74LV245ATDBR supports hot-swap via its Ioff feature. When VCC = 0 V, the outputs are actively disabled, blocking current flow even if A or B port voltages range from 0 to 5.5 V. This prevents damage during live insertion into powered backplanes-confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables of the SN74LV245ATDBR datasheet.
Can SN74LV245ATDBR interface a 3.3 V microcontroller with a 5 V peripheral without external level shifters?
Yes. SN74LV245ATDBR supports mixed-mode operation: its inputs tolerate 5.5 V regardless of VCC, and outputs swing rail-to-rail (0 V to VCC). With VCC = 3.3 V, it safely accepts 5 V inputs and drives 3.3 V–compatible loads; with VCC = 5 V, it drives 5 V peripherals while accepting 3.3 V logic levels-verified in the Recommended Operating Conditions table for SN74LV245ATDBR.
What is the maximum capacitive load SN74LV245ATDBR can drive while maintaining guaranteed timing?
SN74LV245ATDBR is characterized for CL = 15 pF and CL = 50 pF loads. At 5 V VCC and TA = 25°C, max tPLH/tPHL is 9.7 ns for CL = 15 pF and 10.7 ns for CL = 50 pF. Driving >50 pF may exceed timing specs; TI recommends limiting total trace + load capacitance to ≤50 pF for guaranteed compliance with SN74LV245ATDBR switching characteristics.
How does the DIR pin function when OE is high (disabled) on SN74LV245ATDBR?
When OE is high, all A and B outputs enter high-impedance state regardless of DIR logic level. DIR retains its function but has no effect on data flow-confirmed in the FUNCTION TABLE of the SN74LV245ATDBR datasheet. DIR state is preserved and immediately active upon OE transition to low, enabling glitch-free direction reconfiguration.
SN74LV245ATDBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LV
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
SN74LV245ATDBR FAQ
1.How can I place an order for SN74LV245ATDBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LV245ATDBR 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 SN74LV245ATDBR reliable?
The price and inventory of SN74LV245ATDBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV245ATDBR is usually 5 days.
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SN74LV245ATDBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LV245ATDBR 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 SN74LV245ATDBR?
For technical support, including SN74LV245ATDBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV245ATDBR requirements.
6.How does Aetrix verify that SN74LV245ATDBR is sourced from the original manufacturer or authorized distributors?
All SN74LV245ATDBR 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 SN74LV245ATDBR meets industry standards.
7.What is the process for return or replacement of SN74LV245ATDBR?
All SN74LV245ATDBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV245ATDBR, 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 SN74LV245ATDBR part is unused and in its original packaging.
Return procedure for SN74LV245ATDBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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