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Texas Instruments SN74LVTH2952DBR
- Part No.:
- SN74LVTH2952DBR
- Manufacturer:
- Texas Instruments
- Package:
- 24-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74LVTH2952DBR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 24SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,995
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Product details
Overview
SN74LVTH2952DBR from Texas Instruments is an octal bus transceiver and register IC designed for bidirectional 3.3-V VCC operation with 5-V tolerant inputs/outputs. It features dual 8-bit back-to-back registers, bus-hold on all data inputs, Ioff and power-up 3-state for hot insertion, and supports mixed-mode signal interfacing between 3.3-V and 5-V systems in industrial control backplanes.
For engineers reviewing the SN74LVTH2952DBR datasheet, SN74LVTH2952DBR pinout, SN74LVTH2952DBR application, or SN74LVTH2952DBR equivalent, key selection criteria include its 24-pin TSSOP package, 150-MHz clock frequency capability, ±100 µA Ioff specification, bus-hold current of ±500 µA at 3.6 V, and guaranteed operation down to 2.7 V supply voltage.
Technical Context
The SN74LVTH2952DBR implements two independent 8-bit bidirectional data paths (A↔B) controlled by separate clock-enable (CLKENAB/CLKENBA), clock (CLKAB/CLKBA), and output-enable (OEAB/OEBA) signals. Each direction uses edge-triggered latching on the low-to-high clock transition when its corresponding clock-enable is low.
Its bus-hold circuitry actively maintains valid logic levels on unused A/B inputs without external resistors, while Ioff and power-up 3-state ensure safe hot-insertion by disabling outputs during power transitions and preventing backflow current when VCC = 0 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - ensures stable operation across wide industrial supply tolerances |
| Input Voltage Tolerance | Up to 5.5 V - enables direct connection to legacy 5-V TTL buses without level shifters |
| Max Clock Frequency | 150 MHz - supports high-speed synchronous data transfer between buses |
| Ioff Current | ±100 µA at VCC = 0 V - prevents damaging current flow during hot-swap events |
| Bus-Hold Current | ±500 µA at VCC = 3.6 V - eliminates need for external pullup/pulldown resistors on floating inputs |
| Output Drive | 64 mA sink / 32 mA source - drives standard TTL loads with margin under worst-case conditions |
| Propagation Delay | 1.2–5.5 ns (tPLH/tPHL) - enables precise timing alignment in synchronous bus architectures |
Pinout & Package
SN74LVTH2952DBR is housed in a 24-pin TSSOP (PW) package, 7.8 mm × 4.4 mm footprint, 1.2 mm max height, with 0.65 mm lead pitch and exposed metal thermal pad per TI PW0024A outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A8 | Port A data inputs/outputs | Bidirectional data path terminal for first 8-bit bus; internally registered on CLKAB edge |
| B1–B8 | Port B data inputs/outputs | Bidirectional data path terminal for second 8-bit bus; internally registered on CLKBA edge |
| CLKAB | Port A clock input | Low-to-high edge triggers storage of A-port data into A→B register when CLKENAB = L |
| CLKBA | Port B clock input | Low-to-high edge triggers storage of B-port data into B→A register when CLKENBA = L |
| CLKENAB | Port A clock-enable input | Active-low enable for CLKAB sampling; disables A→B register update when high |
| CLKENBA | Port B clock-enable input | Active-low enable for CLKBA sampling; disables B→A register update when high |
| OEAB | Port A output-enable | Active-low control for A-port drivers; places A1–A8 in high-impedance when high |
| OEBA | Port B output-enable | Active-low control for B-port drivers; places B1–B8 in high-impedance when high |
| VCC | Power supply | 3.3-V nominal supply; supports down to 2.7 V for battery-backed operation |
| GND | Ground reference | Common return path for all I/O and internal logic; decoupling required per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode 3.3-V/5-V interface | Enables seamless interconnection between modern low-voltage logic and legacy 5-V TTL systems without external translation |
| Integrated bus-hold circuitry | Eliminates external pullup/pulldown resistors on A/B data lines, reducing BOM count and PCB area |
| Ioff and power-up 3-state | Guarantees high-impedance outputs during power sequencing, enabling safe live insertion into powered backplanes |
| Output ground bounce <0.8 V | Minimizes noise coupling into shared ground planes during simultaneous switching of multiple outputs |
| Latch-up immunity >500 mA | Meets JESD17 requirements for robust operation in electrically noisy industrial environments |
Applications
| Industrial Backplane Interface | Hot-Swappable Module Interconnect |
|---|---|
Use Scenario: Connecting 3.3-V FPGA-based control modules to legacy 5-V PLC I/O racks via shared parallel backplane. IC Role / Device Role / Timing Role: Bidirectional register transceiver synchronizing data transfers between buses using independent CLKAB/CLKBA edges. Use Value: Eliminates level-shifter ICs and pullup resistors while ensuring deterministic timing via 150-MHz clock support and sub-6-ns propagation delays. | Use Scenario: Enabling field-replaceable compute cards in telecom shelf systems where modules are inserted/removed while main backplane remains powered. IC Role / Device Role / Timing Role: Hot-insertion–qualified bus interface providing Ioff isolation and power-up 3-state to prevent bus contention during card insertion. Use Value: Prevents system reset or data corruption during live swaps by guaranteeing high-Z outputs until VCC stabilizes and OE is asserted. |
| Embedded Controller Data Bridge | Test Equipment Signal Conditioning |
Use Scenario: Isolating and buffering address/data lines between a 3.3-V ARM microcontroller and external 5-V memory or peripheral chips. IC Role / Device Role / Timing Role: Dual-register transceiver acting as synchronous data bridge with independent A↔B clock domains and bus-hold protection on idle lines. Use Value: Maintains valid logic states on un-driven bus segments during CPU sleep modes, avoiding spurious reads/writes due to floating inputs. | Use Scenario: Conditioning parallel digital signals from DUTs in automated test equipment where 5-V logic sources drive 3.3-V measurement ASICs. IC Role / Device Role / Timing Role: Level-tolerant bidirectional buffer with precise setup/hold timing (1.5–2.2 ns) for synchronized capture of high-speed test vectors. Use Value: Supports 150-MHz vector rates while maintaining signal integrity through controlled output drive strength and low ground bounce. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal bidirectional transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVT245DBR | No internal registers; purely combinatorial transceiver with direction control instead of clocked registers | Suitable for asynchronous bus bridging but lacks synchronous data capture capability | Select when deterministic clocked registration is not required and lower propagation delay (2.5 ns) is prioritized |
| SN74LVCH16245ADGGR | 16-bit, non-latched, with configurable 3.3-V-only I/O and no 5-V tolerance | Designed for high-density 3.3-V-only systems; requires external level shifters for 5-V interfaces | Select for wider bus width and lower static current (10 µA), but only in fully 3.3-V environments |
Compared with SN74LVT245DBR and SN74LVCH16245ADGGR, the SN74LVTH2952DBR uniquely combines 5-V input tolerance, clocked dual-register architecture, and bus-hold functionality-making it the only option among the three that supports mixed-voltage synchronous data capture without external components.
Availability
SN74LVTH2952DBR is available at Aetrix Electronics and suitable for industrial backplane interfaces, hot-swappable module interconnects, and embedded controller data bridges requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SN74LVTH2952DBR 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 company specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74LVTH2952DBR belongs to TI's LVTH logic family, engineered specifically for robust mixed-voltage bidirectional bus interfacing in harsh industrial environments with emphasis on hot-swap reliability and noise immunity.
FAQ
What is the maximum clock frequency supported by the SN74LVTH2952DBR?
The SN74LVTH2952DBR supports a maximum clock frequency of 150 MHz across its recommended operating range (VCC = 2.7 V to 3.6 V, TA = −40°C to 85°C). This value is specified in the timing requirements table of the official datasheet (SCBS710F) and verified under CL = 50 pF load conditions. The SN74LVTH2952DBR achieves this performance while maintaining setup/hold margins and low propagation delay, making it suitable for high-speed synchronous bus applications.
Does the SN74LVTH2952DBR support hot insertion, and how is it implemented?
Yes, the SN74LVTH2952DBR supports hot insertion via two integrated features: Ioff circuitry and power-up 3-state. When VCC = 0 V, Ioff limits current flow to ±100 µA, preventing backflow damage. During power-up/down transitions (VCC between 0 V and 1.5 V), outputs are forced into high-impedance regardless of OE state. These mechanisms are explicitly documented in the datasheet's "description/ordering information" and "absolute maximum ratings" sections, confirming robust hot-swap capability for the SN74LVTH2952DBR.
What is the purpose of bus-hold circuitry in the SN74LVTH2952DBR, and how does it affect design?
The bus-hold circuitry in the SN74LVTH2952DBR actively maintains valid logic levels (VIH/VIL) on unused A/B data inputs without external resistors. It provides ±500 µA dynamic hold current at VCC = 3.6 V, eliminating the need for pullup/pulldown networks. As stated in the datasheet, using external resistors with enabled bus-hold is not recommended. This feature reduces BOM cost, saves PCB space, and improves reliability in the SN74LVTH2952DBR by preventing floating-input-induced glitches in partially populated bus systems.
Can the SN74LVTH2952DBR interface directly with 5-V TTL logic, and what are the voltage limits?
Yes, the SN74LVTH2952DBR supports direct 5-V TTL interfacing: its inputs tolerate up to 5.5 V regardless of VCC, and outputs drive to VOH ≥ 2.4 V (at IOL = 24 mA, VCC = 3 V) and VOL ≤ 0.55 V (at IOL = 64 mA, VCC = 3 V). Absolute maximum input voltage is 7 V, and output voltage in high state is limited to VCC + 0.5 V. These specifications are confirmed in the "absolute maximum ratings" and "electrical characteristics" tables of the SN74LVTH2952DBR datasheet, enabling interoperability with legacy 5-V systems without level shifters.
What package type and dimensions does the SN74LVTH2952DBR use, and are thermal considerations documented?
The SN74LVTH2952DBR uses a 24-pin TSSOP package (TI drawing PW0024A), measuring 7.8 mm × 4.4 mm with 0.65 mm lead pitch and 1.2 mm max height. Its thermal impedance θJA is 88°C/W, documented in the "absolute maximum ratings" table. TI provides full package drawings, PCB layout guidelines, and stencil design recommendations on ti.com/sc/package. This standardized TSSOP footprint ensures compatibility with automated assembly and allows effective heat dissipation in the SN74LVTH2952DBR's typical industrial operating range.
SN74LVTH2952DBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVTH
- Package/Case:
- 24-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 24-SSOP
SN74LVTH2952DBR FAQ
1.How can I place an order for SN74LVTH2952DBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVTH2952DBR 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 SN74LVTH2952DBR reliable?
The price and inventory of SN74LVTH2952DBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH2952DBR is usually 5 days.
3.What payment methods are accepted for SN74LVTH2952DBR?
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4.How is shipping managed for SN74LVTH2952DBR?
SN74LVTH2952DBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVTH2952DBR 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 SN74LVTH2952DBR?
For technical support, including SN74LVTH2952DBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH2952DBR requirements.
6.How does Aetrix verify that SN74LVTH2952DBR is sourced from the original manufacturer or authorized distributors?
All SN74LVTH2952DBR 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 SN74LVTH2952DBR meets industry standards.
7.What is the process for return or replacement of SN74LVTH2952DBR?
All SN74LVTH2952DBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH2952DBR, 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 SN74LVTH2952DBR part is unused and in its original packaging.
Return procedure for SN74LVTH2952DBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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