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Texas Instruments SN74LVT16952DLR
- Part No.:
- SN74LVT16952DLR
- Manufacturer:
- Texas Instruments
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74LVT16952DLR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,323
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Product details
Overview
SN74LVT16952DLR from Texas Instruments is a 3.3-V Advanced BiCMOS Technology (ABT) 16-bit registered transceiver with 3-state outputs, designed for mixed-mode signal operation between 3.3-V and 5-V systems. It supports dual 8-bit or single 16-bit bidirectional data flow, features bus-hold inputs to eliminate external pullups, and operates across –40°C to 85°C. It is used in backplane interface logic and voltage-level-translating bus systems.
For engineers reviewing the SN74LVT16952DLR datasheet, SN74LVT16952DLR pinout, SN74LVT16952DLR application, or SN74LVT16952DLR equivalent, key selection considerations include its 56-pin DL package, 150-MHz maximum clock frequency, 3.3-V VCC with 5-V tolerant I/O, bus-hold functionality, and registered transceiver architecture with independent A/B port control.
Technical Context
The SN74LVT16952DLR implements two independent 8-bit registered transceiver blocks (Port A ↔ Port B), each with dedicated clock (CLKAB/CLKBA), clock-enable (CLKENAB/CLKENBA), and output-enable (OEAB/OEBA) controls. Data is latched on the low-to-high transition of the respective clock when its clock-enable is low.
It uses ABT (Advanced BiCMOS Technology) to achieve low static power dissipation while supporting live insertion and distributed VCC/GND pins to minimize high-speed switching noise. The flow-through pinout architecture simplifies PCB layout and reduces trace skew between register inputs and outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply Voltage | 2.7 V to 3.6 V - Enables stable operation under unregulated battery supply down to 2.7 V. |
| Max Clock Frequency | 150 MHz - Supports high-speed synchronous bus transfer in demanding digital systems. |
| I/O Voltage Tolerance | 5.5 V input - Allows direct interfacing with legacy 5-V TTL logic without level-shifting circuitry. |
| Output Drive Strength | IOL = 64 mA / IOH = –32 mA at VCC = 3 V - Sufficient to drive multiple LVT loads or moderate capacitive loads. |
| Bus-Hold Current | ±75 µA at VI = 0.8 V or 2 V - Actively holds floating inputs at valid logic levels, eliminating need for external pullup/pulldown resistors. |
| Propagation Delay | tPLH/tPHL ≤ 5.8 ns (VCC = 3.3 V, CL = 50 pF) - Ensures tight timing margins in high-frequency register-to-bus paths. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade embedded and communications equipment environments. |
Pinout & Package
SN74LVT16952DLR is housed in a 56-pin shrink small-outline package (DL), 300-mil body width, with 0.5-mm pitch and 1.2-mm max height. Pin 1 is marked by a beveled corner or dot; pin numbering follows standard counter-clockwise convention from top-left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OEAB, 2OEAB, 1OEBA, 2OEBA | Output Enable (active-low) | Controls 3-state output drivers per 8-bit port; tie to VCC via pullup for high-impedance during power-up/down. |
| 1CLKAB, 2CLKAB, 1CLKBA, 2CLKBA | Register clock input (rising-edge) | Latches data from A→B or B→A on low-to-high transition when corresponding CLKEN is low. |
| 1CLKENAB, 2CLKENAB, 1CLKENBA, 2CLKENBA | Register clock enable (active-low) | Gates clock action - only active when low; allows synchronous data capture control per channel group. |
| A1–A8, B1–B8 (x2 groups) | Bidirectional data terminals | 16 total I/Os split into two 8-bit ports; support simultaneous or staggered transceiver operation. |
| VCC, GND (x8 each) | Power and ground distribution | Distributed VCC/GND pins reduce simultaneous switching noise and improve signal integrity at high frequencies. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode I/O compatibility | 3.3-V VCC with 5-V tolerant inputs/outputs enables seamless integration into hybrid-voltage backplanes and legacy system upgrades. |
| Integrated bus-hold circuitry | Eliminates external pullup resistors on unused or unterminated data lines, reducing BOM count and board space. |
| Flow-through pinout architecture | Minimizes trace length mismatch between registers and I/Os, improving timing predictability and easing high-speed PCB routing. |
| Live insertion support | Robust ESD protection (>2000 V HBM) and latch-up immunity (>500 mA) allow hot-plug capability in modular chassis systems. |
| Dual independent 8-bit control | Separate clock, clock-enable, and output-enable signals per 8-bit segment enable flexible data staging and partial bus isolation. |
Applications
| Backplane Interface Logic | Voltage-Level Translating Bus |
|---|---|
Use Scenario: Interfacing a 3.3-V FPGA-based controller to a legacy 5-V peripheral bus in telecom line cards. IC Role / Device Role / Timing Role: Registered transceiver providing synchronized, level-shifted data transfer with clock-domain isolation and bus-hold stability. Use Value: Eliminates discrete level shifters and pullup networks while maintaining setup/hold timing compliance at 100+ MHz. | Use Scenario: Bridging a 3.3-V microprocessor data bus to a 5-V memory subsystem in industrial PLC modules. IC Role / Device Role / Timing Role: Bidirectional registered buffer with independent A/B port enables controlled read/write handshaking and glitch-free bus arbitration. Use Value: Reduces interconnect complexity and improves noise margin through distributed power/ground and low-VOLP design. |
| Hot-Swappable Module Interface | High-Density I/O Expansion |
Use Scenario: Enabling live insertion of daughterboards into a 3.3-V carrier board with 5-V compatible backplane slots. IC Role / Device Role / Timing Role: Isolation and translation layer with ESD-hardened I/O and power-rail decoupling support. Use Value: Meets MIL-STD-883 ESD requirements and JEDEC latch-up specs, ensuring reliability during repeated hot-plug cycles. | Use Scenario: Expanding GPIO count on a compact embedded controller using space-constrained 300-mil SSOP packaging. IC Role / Device Role / Timing Role: High-pin-count registered transceiver delivering twice the I/O density of standard SOIC in same PCB area. Use Value: Achieves 16-bit bidirectional expansion in DL package (13.9 × 7.9 mm), optimizing board real estate in size-sensitive designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC16952DGGR | Lower drive strength (IOL = 24 mA), CMOS process, no bus-hold, 3.3-V only I/O tolerance (no 5-V). | Suitable for pure 3.3-V systems where level translation is unnecessary and lower power is prioritized. | Select when interfacing only with LVC/LVT families and 5-V tolerance is not required. |
| SN74ALVCH16952GR | Higher speed (200 MHz fmax), ALVC process, 3.3-V VCC, 5-V tolerant I/O, but no bus-hold circuitry. | Better for ultra-high-speed backplanes requiring tighter propagation delay (<4 ns), but requires external pullups. | Choose when maximum clock rate and low skew outweigh bus-hold convenience. |
Compared with SN74LVC16952DGGR and SN74ALVCH16952GR, the SN74LVT16952DLR uniquely combines 5-V I/O tolerance, integrated bus-hold, and ABT low-noise performance - making it optimal for robust, mixed-voltage industrial backplane interfaces where reliability and design simplicity are critical.
Availability
SN74LVT16952DLR is available at Aetrix Electronics and suitable for backplane interface logic, voltage-level-translating bus systems, hot-swappable module interfaces, and high-density I/O expansion requiring stable component supply across extended product lifecycles.
Supply support for SN74LVT16952DLR 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 logic solutions, with decades of heritage in high-reliability interface ICs.
The SN74LVT16952DLR belongs to TI's Widebus™ family of advanced bus-interface devices, engineered specifically for high-speed, mixed-voltage system interconnect in industrial, telecom, and computing infrastructure.
FAQ
What is the recommended power-up sequence for SN74LVT16952DLR?
TI recommends tying all OE inputs (1OEAB, 2OEAB, 1OEBA, 2OEBA) to VCC through a pullup resistor (minimum value determined by driver sink capability) to ensure outputs remain in high-impedance state during power-up and power-down. This prevents bus contention before system initialization completes. The SN74LVT16952DLR itself has no internal power-on reset; external sequencing is required for deterministic behavior.
Does SN74LVT16952DLR support true 5-V operation?
No - the SN74LVT16952DLR requires a 2.7-V to 3.6-V VCC supply and is not rated for 5-V VCC operation. However, its inputs and outputs tolerate up to 5.5-V signals, enabling safe interfacing with 5-V TTL logic while powered from 3.3-V rails. This mixed-mode capability is a core feature of the ABT process used in the SN74LVT16952DLR.
Can SN74LVT16952DLR be used as two independent 8-bit transceivers?
Yes - the SN74LVT16952DLR contains two fully independent 8-bit registered transceiver sections (1A/1B and 2A/2B), each with dedicated clock (CLKAB/CLKBA), clock-enable (CLKENAB/CLKENBA), and output-enable (OEAB/OEBA) controls. This allows asynchronous operation: one port can latch and drive while the other remains idle or in high-Z, supporting flexible data staging in complex bus architectures.
What is the purpose of bus-hold circuitry in SN74LVT16952DLR?
The bus-hold circuitry in SN74LVT16952DLR actively maintains unused or floating data inputs (A1–A8, B1–B8) at their last-valid logic state using ±75 µA hold current. This eliminates the need for external pullup or pulldown resistors, reducing component count, board space, and potential signal integrity issues caused by weak external biasing - a key reliability feature in the SN74LVT16952DLR's industrial targeting.
Is SN74LVT16952DLR suitable for new designs?
No - according to TI's official packaging addendum, SN74LVT16952DLR is marked "NRND" (Not Recommended for New Designs). While still in production to support existing customers, TI advises selecting newer alternatives like SN74LVC16952 or SN74ALVCH16952 for new projects. Aetrix Electronics continues to supply SN74LVT16952DLR for legacy system maintenance, repair, and obsolescence mitigation programs.
SN74LVT16952DLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVT
- Package/Case:
- 56-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Transceiver, Non-Inverting
- Number of Elements:
- 2
- 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:
- 56-SSOP
SN74LVT16952DLR FAQ
1.How can I place an order for SN74LVT16952DLR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVT16952DLR 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 SN74LVT16952DLR reliable?
The price and inventory of SN74LVT16952DLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVT16952DLR is usually 5 days.
3.What payment methods are accepted for SN74LVT16952DLR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVT16952DLR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVT16952DLR?
SN74LVT16952DLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVT16952DLR 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 SN74LVT16952DLR?
For technical support, including SN74LVT16952DLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVT16952DLR requirements.
6.How does Aetrix verify that SN74LVT16952DLR is sourced from the original manufacturer or authorized distributors?
All SN74LVT16952DLR 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 SN74LVT16952DLR meets industry standards.
7.What is the process for return or replacement of SN74LVT16952DLR?
All SN74LVT16952DLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVT16952DLR, 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 SN74LVT16952DLR part is unused and in its original packaging.
Return procedure for SN74LVT16952DLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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