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Texas Instruments SN74LVTH2245DWR
- Part No.:
- SN74LVTH2245DWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74LVTH2245DWR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,990
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Product details
Overview
SN74LVTH2245DWR from Texas Instruments is an octal bus transceiver designed for 3.3-V VCC operation with mixed-mode 5-V input/output tolerance, enabling TTL-level interfacing between 3.3-V and 5-V data buses. It supports bidirectional data flow (A↔B), features bus-hold on all data inputs, integrated 22-Ω B-port series termination, and Ioff/power-up 3-state for hot insertion in industrial backplane and legacy interface applications.
For engineers reviewing the SN74LVTH2245DWR datasheet, SN74LVTH2245DWR pinout, SN74LVTH2245DWR application, or SN74LVTH2245DWR equivalent, key selection criteria include its 20-pin SOIC-DW package, ±12 mA B-port drive capability, 2.7–3.6 V supply range, bus-hold functionality eliminating external resistors, and compliance with JESD 17 latch-up and JESD 22 ESD standards.
Technical Context
This device implements asynchronous bidirectional bus translation using two independent control signals: DIR selects direction (A→B or B→A), while OE enables/disables output drivers. The A-port supports ±64 mA drive strength at 3.3 V, whereas the B-port integrates 22-Ω series resistors to suppress overshoot/undershoot and is rated for ±12 mA.
It incorporates active bus-hold circuitry on all A- and B-port data inputs (±75 µA hold current at 3 V), Ioff protection limiting reverse current during power-down, and power-up 3-state behavior ensuring high-impedance outputs when VCC is below 1.5 V - critical for hot-swap and mixed-voltage system interoperability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - supports unregulated battery operation down to 2.7 V without regulation circuitry. |
| I/O Voltage Tolerance | 5.5 V max input voltage - enables direct connection to 5-V TTL buses without level-shifting components. |
| A-port IOL/IOH | 64 mA / −32 mA - sufficient to drive standard TTL loads and legacy logic families directly. |
| B-port Series Resistance | 22 Ω integrated - eliminates need for external series termination resistors on B-side traces. |
| Bus-Hold Current | ±75 µA at VCC = 3 V - actively holds floating inputs at valid logic levels, removing pullup/pulldown requirements. |
| tPLH/tPHL (A→B) | 1.1 ns to 5.3 ns at VCC = 3.3 V - ensures sub-6 ns propagation for high-speed inter-bus communication. |
| Latch-up Immunity | >500 mA per JESD 17 - guarantees robustness against transient-induced latch-up in noisy industrial environments. |
Pinout & Package
SN74LVTH2245DWR is housed in a 20-pin SOIC (DW) package measuring 12.8 mm × 7.5 mm × 2.65 mm (max height), RoHS-compliant with NiPdAu lead finish and moisture sensitivity level (MSL) 1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A1–A8 inputs/outputs | Octal A-side bidirectional data terminals; support ±64 mA drive and bus-hold. |
| 11, 12, 13, 14, 15, 16, 17, 18 | B1–B8 inputs/outputs | Octal B-side bidirectional data terminals; include 22-Ω series resistance and ±12 mA drive. |
| 9 | DIR | Direction control: low = B→A, high = A→B; TTL-compatible threshold (VIL ≤ 0.8 V, VIH ≥ 2 V). |
| 19 | OE | Output enable: low = active, high = high-impedance; supports hot-insertion via Ioff and power-up 3-state. |
| 10 | GND | Ground reference for all logic and I/O circuits. |
| 20 | VCC | 3.3-V supply input; must be decoupled locally; device remains in high-Z state if VCC < 1.5 V. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal operation | 5-V tolerant inputs/outputs with 3.3-V VCC - enables seamless bridging between legacy 5-V and modern 3.3-V subsystems. |
| Integrated B-port series termination | 22-Ω on-chip resistors - reduce PCB component count and layout complexity for B-side trace impedance matching. |
| Active bus-hold circuitry | Holds unused A/B inputs at valid logic levels without external resistors - prevents floating-input metastability and EMI. |
| Hot-insertion support | Ioff and power-up 3-state - blocks damaging back-current during live board insertion and ensures glitch-free power sequencing. |
| Low ground bounce | VOLP < 0.8 V at VCC = 3.3 V - minimizes noise coupling into shared ground planes in dense digital systems. |
Applications
| Industrial Backplane Interface | Legacy System Bus Extension |
|---|---|
|
Use Scenario: Interfacing a 3.3-V FPGA-based controller to a 5-V ISA or PCI-X legacy backplane with bidirectional address/data lines. IC Role / Device Role / Timing Role: Bidirectional bus transceiver managing A↔B data flow under DIR control; OE isolates buses during reset or fault conditions. Use Value: Eliminates discrete level shifters and termination resistors, reducing BOM cost and PCB area while maintaining signal integrity up to 100 MHz. |
Use Scenario: Extending a 5-V microcontroller's parallel bus to a 3.3-V ADC/DAC daughterboard in test equipment or instrumentation. IC Role / Device Role / Timing Role: Direction-controlled translator converting 5-V logic levels to 3.3-V compatible signals with sub-6 ns propagation delay. Use Value: Bus-hold prevents floating inputs during bus arbitration gaps; integrated 22-Ω resistors suppress reflections on stubbed traces. |
| Hot-Swappable Module Interface | Embedded Control Plane Bridging |
|
Use Scenario: Enabling live insertion of 3.3-V I/O modules into a powered 5-V telecom shelf management backplane. IC Role / Device Role / Timing Role: Hot-insertion–qualified transceiver using Ioff and power-up 3-state to prevent backfeed and ensure safe power sequencing. Use Value: Meets JESD 17 latch-up immunity (>500 mA) and JESD 22 ESD ratings (2000-V HBM), ensuring field reliability during repeated swaps. |
Use Scenario: Bridging control signals between a 3.3-V ARM processor and 5-V peripheral ASICs in industrial PLCs or motor drives. IC Role / Device Role / Timing Role: Asynchronous bidirectional translator supporting isolated enable (OE) and direction (DIR) control for flexible bus arbitration. Use Value: Supports 2.7–3.6 V supply range - accommodates brown-out conditions in battery-backed or wide-input DC-DC systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC2245ADWR | No bus-hold; lower drive (±24 mA A-port, ±12 mA B-port); 1.65–3.6 V VCC. | Lacks active input retention - requires external pullups/pulldowns on floating lines; suited for cost-sensitive, non-hot-swap designs. | Select when bus-hold is unnecessary and wider VCC range (1.65 V) is required for ultra-low-power operation. |
| SN74AVC2245RHLR | Higher speed (tPD ≤ 3.2 ns); 1.2–3.6 V VCC; no integrated B-port resistors; no bus-hold. | Requires external 22-Ω series resistors on B-side; optimized for high-frequency DDR or memory interfaces, not legacy bus bridging. | Choose for sub-3.5 ns timing-critical paths where external termination is acceptable and lowest propagation delay is mandatory. |
Compared with SN74LVC2245ADWR and SN74AVC2245RHLR, SN74LVTH2245DWR uniquely combines 5-V I/O tolerance, integrated B-port termination, and active bus-hold - making it the only option among the three qualified for unregulated 2.7-V operation and hot-insertion in mixed-voltage backplanes.
Availability
SN74LVTH2245DWR is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system bus extensions, hot-swappable module designs, and embedded control plane bridging requiring stable component supply across extended temperature ranges (−40°C to 85°C).
Supply support for SN74LVTH2245DWR 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 over 90 years of innovation in industrial, automotive, and communications markets.
SN74LVTH2245DWR belongs to TI's LVTH (Low-Voltage BiCMOS Transistor-Transistor Logic) family, engineered specifically for robust mixed-voltage bus interfacing in industrial control, telecom infrastructure, and legacy system upgrades.
FAQ
What is the maximum input voltage rating for SN74LVTH2245DWR?
The SN74LVTH2245DWR supports a maximum input voltage of 5.5 V on all data and control pins, allowing direct connection to 5-V TTL logic without external level-shifting circuitry. This 5-V tolerance applies across the full operating temperature range (−40°C to 85°C) and is specified in the absolute maximum ratings table of the SCBS707E datasheet.
Does SN74LVTH2245DWR require external pullup or pulldown resistors on its data inputs?
No, SN74LVTH2245DWR does not require external pullup or pulldown resistors because it includes active bus-hold circuitry on all A- and B-port data inputs. This feature maintains unused or floating inputs at valid logic levels with ±75 µA hold current at 3 V, eliminating risk of metastability and reducing BOM count.
What is the purpose of the 22-Ω series resistance on the B-port outputs of SN74LVTH2245DWR?
The 22-Ω series resistance integrated into each B-port output of SN74LVTH2245DWR reduces signal overshoot and undershoot by damping transmission-line reflections on PCB traces. This eliminates the need for discrete series termination resistors, simplifying layout and improving signal integrity for B-side connections operating at frequencies up to 100 MHz.
How does SN74LVTH2245DWR support hot insertion in live backplane systems?
SN74LVTH2245DWR supports hot insertion through dual mechanisms: Ioff circuitry disables outputs during power-down to prevent damaging back-current, and power-up 3-state forces outputs into high-impedance mode when VCC is below 1.5 V. These features are validated per JESD 17 latch-up and JESD 22 ESD standards.
What package type and dimensions does SN74LVTH2245DWR use?
SN74LVTH2245DWR uses a 20-pin SOIC (DW) package with dimensions of 12.8 mm × 7.5 mm × 2.65 mm (maximum height). It is supplied in tape-and-reel format (2000 units per reel), RoHS-compliant, with NiPdAu lead finish and MSL Level-1 rating for unlimited floor life at 260°C peak reflow.
SN74LVTH2245DWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVTH
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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:
- 32mA, 64mA; 12mA, 12mA
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74LVTH2245DWR FAQ
1.How can I place an order for SN74LVTH2245DWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVTH2245DWR 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 SN74LVTH2245DWR reliable?
The price and inventory of SN74LVTH2245DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH2245DWR is usually 5 days.
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4.How is shipping managed for SN74LVTH2245DWR?
SN74LVTH2245DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVTH2245DWR 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 SN74LVTH2245DWR?
For technical support, including SN74LVTH2245DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH2245DWR requirements.
6.How does Aetrix verify that SN74LVTH2245DWR is sourced from the original manufacturer or authorized distributors?
All SN74LVTH2245DWR 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 SN74LVTH2245DWR meets industry standards.
7.What is the process for return or replacement of SN74LVTH2245DWR?
All SN74LVTH2245DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH2245DWR, 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 SN74LVTH2245DWR part is unused and in its original packaging.
Return procedure for SN74LVTH2245DWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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