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Texas Instruments SN74LVTH16652DLR
- Part No.:
- SN74LVTH16652DLR
- Manufacturer:
- Texas Instruments
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74LVTH16652DLR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,259
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Product details
Overview
SN74LVTH16652DLR from Texas Instruments is a 3.3-V ABT 16-bit bus transceiver and register with 3-state outputs, designed for mixed-mode (3.3-V VCC / 5-V I/O) interfacing between low-voltage logic and legacy TTL systems. It supports real-time or registered data transfer across two 8-bit buses (A↔B), features dual clock inputs (CLKAB/CLKBA), dual select controls (SAB/SBA), and dual output enables (OEAB/OEBA). Used in backplane interface, memory expansion, and FPGA-to-ASIC bridging where hot-insertion and bus-hold are required.
For engineers reviewing the SN74LVTH16652DLR datasheet, SN74LVTH16652DLR pinout, SN74LVTH16652DLR application, or SN74LVTH16652DLR equivalent, key selection considerations include its 56-pin SSOP (DL) package, 3.3-V operation with 5-V tolerant I/O, bus-hold on all data inputs, Ioff-enabled hot-swap capability, and support for both real-time and registered bidirectional data flow without external pull resistors.
Technical Context
The SN74LVTH16652DLR implements a dual 8-bit flow-through architecture with independent A→B and B→A paths, each configurable via SAB/SBA to route either real-time or clocked-register data. Its Advanced BiCMOS Technology (ABT) delivers low static power (<0.19 mA ICC at 3.6 V, outputs disabled) while maintaining TTL-compatible thresholds (VIH = 2 V, VIL = 0.8 V) and 5-V I/O tolerance.
It integrates distributed VCC/GND pins to suppress high-speed switching noise, supports unregulated battery operation down to 2.7 V, and includes active bus-hold circuitry eliminating external biasing. Power-up 3-state and Ioff protection ensure safe hot-insertion: outputs enter high-impedance when VCC < 1.5 V, and reverse current is blocked during partial power-down.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply Range | 2.7 V to 3.6 V - Enables stable operation from single Li-ion or regulated 3.3-V rails, including brownout conditions. |
| Input Voltage Tolerance | –0.5 V to 7 V - Supports 5-V TTL input signals directly without level shifters or clamping diodes. |
| Max Clock Frequency | 150 MHz - Allows high-speed synchronous bus transfers in DDR-capable control planes. |
| IOL / IOH Drive | 64 mA / –32 mA - Drives heavy capacitive loads (e.g., long traces, multiple inputs) without signal degradation. |
| Bus-Hold Current | ±75 µA at VI = 2 V / 0 V - Maintains valid logic state on floating data lines, removing need for external pullup/pulldown resistors. |
| Propagation Delay | tPLH/tPHL ≤ 4.7 ns (CL = 50 pF) - Ensures timing closure in sub-5 ns critical paths for FPGA interconnects. |
| Power-Up 3-State | Active below 1.5 V VCC - Prevents bus contention during power sequencing in multi-rail systems. |
Pinout & Package
SN74LVTH16652DLR is housed in a 56-pin Shrink Small-Outline Package (SSOP), DL variant, with 0.5-mm pitch, 13.9 mm × 7.9 mm body size, and 1.2 mm max height. Pin 1 identifier located at top-left corner (quadrant Q1), with gull-wing leads optimized for automated assembly and thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OEAB, 2OEAB | A→B Output Enable (active-low) | Controls 3-state output drivers from A-bus to B-bus; asserted low enables bidirectional transfer. |
| 1OEBA, 2OEBA | B→A Output Enable (active-low) | Enables data flow from B-bus to A-bus; independent of OEAB for asymmetric bus control. |
| 1CLKAB, 2CLKAB | A→B Register Clock (rising-edge) | Latches A-bus data into internal D flip-flops for stored transfer mode; edge-triggered, no setup/hold dependency on OE. |
| 1CLKBA, 2CLKBA | B→A Register Clock (rising-edge) | Latches B-bus data for stored B→A transfer; operates concurrently with CLKAB for full-duplex registration. |
| 1SAB, 2SAB | A→B Select Control (high = stored, low = real-time) | Determines whether A→B path passes live A-bus signals or previously clocked register contents. |
| 1SBA, 2SBA | B→A Select Control (high = stored, low = real-time) | Configures B→A path behavior independently-enabling mixed-mode operation (e.g., real-time A→B + stored B→A). |
| A1–A8, B1–B8 (x2 sets) | Data I/O terminals (bidirectional) | Two independent 8-bit data ports with bus-hold; each pin functions as input or 3-state output depending on OE and direction control. |
| VCC, GND (x8 each) | Distributed power/ground | Minimizes simultaneous switching noise (SSN) by interleaving supply pins across the die perimeter. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode I/O compatibility | 3.3-V VCC with 5-V tolerant inputs/outputs enables seamless integration between modern low-voltage logic and legacy 5-V subsystems. |
| Integrated bus-hold circuitry | Eliminates external pullup/pulldown resistors on all 32 data lines, reducing BOM count and PCB area in high-pin-count interfaces. |
| Hot-insertion support | Ioff and power-up 3-state prevent backdrive current and bus contention during live board insertion into powered backplanes. |
| Glitch-free select control | Internal logic eliminates decoding glitches during transitions between real-time and stored data modes-critical for deterministic bus arbitration. |
| Flow-through pinout architecture | Input and output pins arranged to minimize trace length and layer transitions, simplifying high-speed PCB layout and impedance control. |
Applications
| Industrial Backplane Interface | FPGA-to-Memory Bridge |
|---|---|
Use Scenario: Interfacing a 3.3-V FPGA I/O bank to a legacy 5-V VMEbus or CompactPCI backplane with strict hot-swap requirements. IC Role / Device Role / Timing Role: Bidirectional level-shifting transceiver with registered data path; provides clock-domain isolation and glitch-free bus arbitration. Use Value: Enables direct connection without discrete level shifters or glue logic; bus-hold maintains bus integrity during FPGA configuration cycles. |
Use Scenario: Connecting a Xilinx Artix-7 FPGA to parallel SRAM or Flash memory operating at 5-V logic levels. IC Role / Device Role / Timing Role: Registered bus transceiver synchronizing asynchronous memory read/write strobes to FPGA clock domain. Use Value: Eliminates timing uncertainty in address/data hold times; 150-MHz clock support meets fast-page-mode SRAM access requirements. |
| Automotive ECU Diagnostics Port | Test Equipment Bus Extender |
Use Scenario: Isolating a 3.3-V microcontroller diagnostic port from a 5-V CAN/LIN physical layer test harness during production line testing. IC Role / Device Role / Timing Role: Hot-pluggable 3-state buffer with Ioff protection; prevents backfeed into MCU during probe attachment/detachment. Use Value: Reduces risk of ESD-induced latch-up or supply rail collapse during manual test fixture engagement. |
Use Scenario: Extending a PXI or VXI controller's 3.3-V parallel bus to drive multiple 5-V instrument modules over 20-cm ribbon cables. IC Role / Device Role / Timing Role: High-drive-strength repeater with distributed VCC/GND to suppress crosstalk and ground bounce on long traces. Use Value: 64-mA sink capability ensures clean signal edges at far-end receivers; flow-through layout minimizes skew across 16-bit data words. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit registered transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC16652DGGR | Lower drive (24 mA IOL), no bus-hold, 1.65–3.6 V VCC range, LVT logic family | Suitable only for 3.3-V-only systems; requires external pull resistors and cannot interface 5-V buses. | Select when cost and power are prioritized over mixed-voltage interoperability and bus robustness. |
| SN74ALVCH16652DLR | Higher speed (200 MHz fmax), same 56-pin DL package, but no Ioff or bus-hold; ALVC family | Lacks hot-insertion support and floating-input immunity; requires careful power sequencing and external biasing. | Choose only in fully controlled 3.3-V environments where maximum throughput outweighs reliability features. |
Compared with SN74LVC16652DGGR and SN74ALVCH16652DLR, the SN74LVTH16652DLR uniquely combines 5-V I/O tolerance, integrated bus-hold, and Ioff-enabled hot-swap-making it the sole option among these three for mixed-voltage, field-serviceable, or high-reliability embedded backplane designs.
Availability
SN74LVTH16652DLR is available at Aetrix Electronics and suitable for industrial backplane interfaces, FPGA-to-memory bridges, automotive diagnostics ports, and test equipment bus extenders requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LVTH16652DLR 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 heritage in logic and interface IC design.
The SN74LVTH16652DLR belongs to TI's Widebus™ ABT family-engineered specifically for high-speed, mixed-voltage bus management in telecom infrastructure, industrial automation, and defense-grade electronics where signal integrity and system-level robustness are non-negotiable.
FAQ
What voltage levels does the SN74LVTH16652DLR support on its I/O pins?
The SN74LVTH16652DLR supports 5-V tolerant inputs and outputs while operating from a 3.3-V supply (VCC = 2.7 V to 3.6 V). Its VIH threshold is 2 V and VIL is 0.8 V, ensuring reliable TTL-level recognition. Input voltage range extends to –0.5 V to 7 V, allowing direct connection to 5-V logic without level-shifting components. This makes the SN74LVTH16652DLR ideal for bridging legacy and modern voltage domains.
Does the SN74LVTH16652DLR support hot-insertion, and how is it implemented?
Yes, the SN74LVTH16652DLR supports hot-insertion via two complementary mechanisms: Ioff circuitry disables outputs when VCC = 0 V, preventing damaging back-current flow; and power-up 3-state forces outputs into high-impedance when VCC is below 1.5 V. These features are intrinsic to the ABT process and require no external circuitry-ensuring safe live insertion into powered backplanes or carrier cards without disrupting system operation.
How does the bus-hold feature work on the SN74LVTH16652DLR, and what benefit does it provide?
The SN74LVTH16652DLR integrates active bus-hold circuitry on all 32 data I/O pins (A1–A8, B1–B8 ×2), drawing ±75 µA to maintain the last-valid logic state when inputs float. This eliminates the need for external 10-kΩ pullup/pulldown resistors-reducing BOM cost, saving PCB space, and improving signal integrity by avoiding resistor-induced loading or noise coupling. Bus-hold remains active regardless of OE or clock states.
Can the SN74LVTH16652DLR operate at frequencies above 100 MHz, and what limits its maximum speed?
Yes, the SN74LVTH16652DLR is rated for up to 150 MHz clock frequency under recommended conditions (VCC = 3.3 V ± 0.3 V, CL = 50 pF). Its maximum speed is limited by propagation delay (tPLH/tPHL ≤ 4.7 ns), input transition rate (≤10 ns/V), and load capacitance. Performance remains stable across –40°C to +85°C, making the SN74LVTH16652DLR suitable for high-throughput data routing in FPGA-based systems and instrumentation.
What is the difference between real-time and stored data transfer modes in the SN74LVTH16652DLR?
In real-time mode (SAB/SBA = low), the SN74LVTH16652DLR passes data directly between A and B buses with minimal propagation delay (~1 ns). In stored mode (SAB/SBA = high), data is latched on rising CLKAB/CLKBA edges into internal D flip-flops and held until next clock-enabling synchronous, glitch-free bus arbitration. Both modes operate independently per direction, allowing mixed configurations (e.g., real-time A→B + stored B→A) within a single SN74LVTH16652DLR device.
SN74LVTH16652DLR 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:
- 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
SN74LVTH16652DLR FAQ
1.How can I place an order for SN74LVTH16652DLR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVTH16652DLR 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 SN74LVTH16652DLR reliable?
The price and inventory of SN74LVTH16652DLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH16652DLR is usually 5 days.
3.What payment methods are accepted for SN74LVTH16652DLR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVTH16652DLR transactions.
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4.How is shipping managed for SN74LVTH16652DLR?
SN74LVTH16652DLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVTH16652DLR 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 SN74LVTH16652DLR?
For technical support, including SN74LVTH16652DLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH16652DLR requirements.
6.How does Aetrix verify that SN74LVTH16652DLR is sourced from the original manufacturer or authorized distributors?
All SN74LVTH16652DLR 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 SN74LVTH16652DLR meets industry standards.
7.What is the process for return or replacement of SN74LVTH16652DLR?
All SN74LVTH16652DLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH16652DLR, 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 SN74LVTH16652DLR part is unused and in its original packaging.
Return procedure for SN74LVTH16652DLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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