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Texas Instruments SN74LVTH16952DLR
- Part No.:
- SN74LVTH16952DLR
- Manufacturer:
- Texas Instruments
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74LVTH16952DLR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,206
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Product details
Overview
SN74LVTH16952DLR from Texas Instruments is a 3.3-V ABT 16-bit registered transceiver with 3-state outputs, designed for mixed-mode (3.3-V VCC / 5-V I/O) bus interfacing in industrial and embedded systems. It supports dual 8-bit or single 16-bit data flow, features bus-hold on all data inputs, operates from 2.7 V to 3.6 V, and delivers 150 MHz max clock frequency with <0.8 V typical output ground bounce.
For engineers reviewing the SN74LVTH16952DLR datasheet, SN74LVTH16952DLR pinout, SN74LVTH16952DLR application, or SN74LVTH16952DLR equivalent, key selection criteria include hot-insertion support via Ioff and power-up 3-state, TTL-compatible 5-V input tolerance, distributed VCC/GND for noise reduction, flow-through pinout for optimized PCB layout, and -40°C to 85°C industrial temperature rating.
Technical Context
The SN74LVTH16952DLR implements two independent 8-bit registered transceiver channels (A↔B), each with dedicated clock (CLKAB/CLKBA), clock-enable (CLKENAB/CLKENBA), and output-enable (OEAB/OEBA) controls. Data latching occurs on the low-to-high clock transition when clock-enable is low, and outputs enter high-impedance state when OE is high.
Its Advanced BiCMOS Technology (ABT) enables 3.3-V core operation while accepting 5-V inputs and driving 5-V-tolerant loads. Bus-hold circuitry maintains valid logic levels on floating A/B data pins without external resistors, and Ioff protection disables outputs during power-down to prevent backflow current.
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 with stable timing and logic integrity |
| Max Clock Frequency | 150 MHz - enables high-speed synchronous data transfer between 3.3-V and 5-V domains |
| IOL / IOH | 64 mA / –32 mA at VCC = 3 V - drives standard TTL loads directly without buffering |
| VOL / VOH | 0.55 V / 2.0 V at IOL = 64 mA / IOH = –32 mA - ensures robust noise margins in mixed-voltage systems |
| Bus-Hold Current | ±75 µA at VI = 0.8 V / 2.0 V - eliminates need for external pullup/pulldown resistors on unused data lines |
| Hot-Insertion Support | Ioff ≤ ±100 µA at VCC = 0 - prevents damaging current backflow during live board insertion |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade reliability in demanding environments |
Pinout & Package
SN74LVTH16952DLR uses a 56-pin Shrink Small-Outline Package (SSOP-DL), 13.9 mm × 7.4 mm × 1.95 mm body, with 0.5 mm pitch and exposed thermal pad not present. Pin 1 is marked by a beveled corner and located in Quadrant Q1 per tape-and-reel orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OEAB, 2OEAB, 1OEBA, 2OEBA | Output Enable (active-low) | Controls 3-state output drivers for respective 8-bit port segments; high = high-Z, low = enabled |
| 1CLKAB, 2CLKAB, 1CLKBA, 2CLKBA | Register Clock (rising-edge triggered) | Latches A→B or B→A data on low-to-high transition when corresponding CLKEN is low |
| 1CLKENAB, 2CLKENAB, 1CLKENBA, 2CLKENBA | Clock Enable (active-low) | Gates clock propagation to registers; high = clock blocked, low = clock active |
| 1A1–1A8, 2A1–2A8, 1B1–1B8, 2B1–2B8 | Data I/O (bidirectional, bus-hold enabled) | 16-bit A and B ports with internal bus-hold; tolerate 5-V inputs while powered from 3.3-V VCC |
| VCC, GND (12× each) | Distributed Power/Ground | Minimizes simultaneous switching noise via interleaved VCC/GND pins across package edges |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage interface | 3.3-V VCC with 5-V tolerant inputs/outputs enables seamless bridging between legacy 5-V and modern low-voltage subsystems |
| Flow-through architecture | Input and output pins arranged on opposite sides of package to simplify layer routing and reduce trace crossovers |
| Power-up 3-state | Outputs remain in high-impedance state during power ramp (VCC = 0–1.5 V), preventing bus contention at startup/shutdown |
| Latch-up immunity | Exceeds 500 mA per JESD 17 - ensures robust operation in noisy industrial environments with transient coupling |
| ESD protection | ≥2000 V HBM, ≥200 V MM - meets MIL-STD-883 requirements for handling and assembly reliability |
Applications
| Industrial Backplane Interface | Legacy System Bus Extender |
|---|---|
Use Scenario: Interfacing a 3.3-V FPGA-based controller to a 5-V ISA or VME backplane with bidirectional data flow and strict timing control. IC Role / Device Role / Timing Role: Registered transceiver providing synchronized, glitch-free data handoff between voltage domains with clocked register staging. Use Value: Eliminates external level shifters and pull-up networks while maintaining 150 MHz throughput and bus-hold stability on unterminated slots. | Use Scenario: Upgrading aging test equipment with 5-V microcontrollers to use modern 3.3-V logic analyzers or memory modules without redesigning the main board. IC Role / Device Role / Timing Role: Voltage-translation buffer with register hold capability, enabling clean handshake protocol across mixed-supply boundaries. Use Value: Supports hot-plug insertion of new peripherals and sustains valid bus states during partial power cycling of subsystems. |
| Hot-Swappable Module Carrier | Embedded Control Bus Isolator |
Use Scenario: Carrier board in modular PLC chassis where I/O modules are inserted/removed under power while maintaining CPU bus integrity. IC Role / Device Role / Timing Role: Isolation transceiver with Ioff and power-up 3-state ensuring zero current injection into powered-down modules. Use Value: Prevents backdrive damage and bus lockup during live module swaps, certified for MIL-PRF-38535 compliance in critical systems. | Use Scenario: Segregating real-time control signals (e.g., motor enable, fault feedback) from noisy digital processing sections in servo drives. IC Role / Device Role / Timing Role: Registered repeater with distributed VCC/GND minimizing ground bounce-induced timing skew on safety-critical paths. Use Value: Reduces signal integrity risk in high-noise motor drive environments while preserving setup/hold timing margins per JEDEC standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC16T245DGGR | Lower drive strength (24 mA), no bus-hold, 1.65–5.5 V VCC range, no Ioff | Suitable for general-purpose level shifting but lacks hot-insertion and bus-stability features | Select when cost and board space are prioritized over industrial robustness and floating-input immunity |
| SN74AVC16T245DGGR | Higher speed (225 MHz), lower VOL (0.25 V), no bus-hold, supports 1.2–3.6 V VCC only | Better for high-frequency DDR or PCIe sideband signaling, but incompatible with 5-V inputs | Choose for next-gen low-voltage designs requiring sub-ns propagation delay and tighter voltage margins |
Compared with SN74LVC16T245DGGR and SN74AVC16T245DGGR, the SN74LVTH16952DLR uniquely combines 5-V input tolerance, integrated bus-hold, Ioff-enabled hot insertion, and industrial temperature rating - making it the only option qualified for legacy-system upgrades requiring zero-layout changes and guaranteed floating-pin stability.
Availability
SN74LVTH16952DLR is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system bus extenders, hot-swappable module carriers, and embedded control bus isolators requiring stable component supply across extended product lifecycles.
Supply support for SN74LVTH16952DLR 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 industrial-grade interface ICs.
The SN74LVTH16952DLR belongs to TI's Widebus™ family of advanced bus-interface devices, engineered specifically for reliable mixed-voltage communication in harsh, long-lifecycle industrial and military-aerospace applications.
FAQ
What voltage levels does the SN74LVTH16952DLR support on its I/O pins?
The SN74LVTH16952DLR accepts 0–5.5 V input voltages on all A and B port pins while operating from a 2.7–3.6 V VCC supply. Its outputs drive to 3.3-V logic levels but are 5-V tolerant in high-impedance and powered-off states, enabling direct connection to 5-V buses without external level-shifting components. This mixed-mode capability is confirmed in the Absolute Maximum Ratings and Recommended Operating Conditions tables of the SCBS697G datasheet.
Does the SN74LVTH16952DLR require external pull-up or pull-down resistors on unused data lines?
No, the SN74LVTH16952DLR does not require external pull-up or pull-down resistors on unused A or B data inputs because it integrates active bus-hold circuitry. Each data pin maintains its last-valid logic state with ±75 µA holding current, as specified in the Electrical Characteristics table. This feature eliminates board space, BOM cost, and layout complexity associated with discrete biasing networks.
How does the SN74LVTH16952DLR support hot insertion in live backplane systems?
The SN74LVTH16952DLR supports hot insertion through two complementary features: Ioff circuitry limits current to ±100 µA when VCC = 0, preventing backflow into powered-down modules; and power-up 3-state ensures outputs remain high-impedance during VCC ramp from 0 to 1.5 V. Both mechanisms are tested per MIL-PRF-38535 and documented in the Functional Description and Absolute Maximum Ratings sections of the datasheet.
What is the maximum clock frequency supported by the SN74LVTH16952DLR at 3.3 V VCC?
The SN74LVTH16952DLR supports a maximum clock frequency of 150 MHz at VCC = 3.3 V ± 0.3 V, as verified in the Timing Requirements table (page 7 of SCBS697G). This applies to both CLKAB and CLKBA inputs under recommended operating conditions with CL = 50 pF load, and is guaranteed across the full –40°C to +85°C industrial temperature range.
Which package type and pin count does the SN74LVTH16952DLR use?
The SN74LVTH16952DLR uses a 56-pin Shrink Small-Outline Package (SSOP-DL) with 0.5 mm pitch, 13.9 mm × 7.4 mm body dimensions, and 1.95 mm maximum height. This is explicitly stated in the Package Option Addendum and confirmed by the "DL" suffix in the part number and the top-view pin diagram labeled "SN74LVTH16952 . . . DGG OR DL PACKAGE".
SN74LVTH16952DLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVTH
- Package/Case:
- 56-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
SN74LVTH16952DLR FAQ
1.How can I place an order for SN74LVTH16952DLR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVTH16952DLR 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 SN74LVTH16952DLR reliable?
The price and inventory of SN74LVTH16952DLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH16952DLR is usually 5 days.
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Once your SN74LVTH16952DLR 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 SN74LVTH16952DLR?
For technical support, including SN74LVTH16952DLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH16952DLR requirements.
6.How does Aetrix verify that SN74LVTH16952DLR is sourced from the original manufacturer or authorized distributors?
All SN74LVTH16952DLR 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 SN74LVTH16952DLR meets industry standards.
7.What is the process for return or replacement of SN74LVTH16952DLR?
All SN74LVTH16952DLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH16952DLR, 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 SN74LVTH16952DLR part is unused and in its original packaging.
Return procedure for SN74LVTH16952DLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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