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Texas Instruments SN74LVCH16652ADLR
- Part No.:
- SN74LVCH16652ADLR
- Manufacturer:
- Texas Instruments
- Package:
- 56-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74LVCH16652ADLR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 56SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,524
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Product details
Overview
SN74LVCH16652ADLR from Texas Instruments is a 16-bit bus transceiver and register with 3-state outputs, designed for bidirectional data flow between A- and B-bus domains in mixed-voltage systems. It operates from 1.65 V to 3.6 V, accepts 5.5 V-tolerant inputs, delivers ≤6.3 ns propagation delay at 3.3 V, and supports real-time or registered data transfer via dual clock (CLKAB/CLKBA) and select (SAB/SBA) controls - used in server memory interfaces and high-speed PC chipset interconnects.
For engineers reviewing the SN74LVCH16652ADLR datasheet, SN74LVCH16652ADLR pinout, SN74LVCH16652ADLR application, or SN74LVCH16652ADLR equivalent, key selection criteria include its dual 8-bit channel architecture, Ioff partial-power-down support, bus-hold on all data I/Os, and compatibility with 3.3-V/5-V mixed-signal environments without level shifters.
Technical Context
The SN74LVCH16652ADLR integrates two independent 8-bit transceiver channels (1A/1B and 2A/2B), each with dedicated clock, select, and output-enable controls. Its D-type flip-flops enable synchronous latching of data from either bus side, while complementary OEAB/OEBA pins provide independent 3-state control per direction.
It implements true bus-hold circuitry on all 32 data I/O pins (A1–A16, B1–B16), eliminating external bias resistors, and features Ioff protection that isolates inputs/outputs when VCC = 0 V - critical for hot-plug and power sequencing in telecom and server backplanes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - enables direct interface with 1.8-V, 2.5-V, and 3.3-V logic domains without voltage translation. |
| Input Voltage Tolerance | Up to 5.5 V - allows safe connection to 5-V legacy peripherals or microcontrollers in mixed-voltage systems. |
| tpd (Max) | 6.3 ns at VCC = 3.3 V - supports >100 MHz bus operation with timing margin for PCB trace delays. |
| IOL / IOH (Max) | 24 mA sink/source at VCC = 3.0 V - drives multiple CMOS loads or terminated transmission lines without buffering. |
| Bus-Hold Current | ±45 μA to ±75 μA - actively holds floating data inputs at valid logic levels, preventing metastability in unterminated buses. |
| Ioff Leakage | ±10 μA at VCC = 0 V - blocks current flow between powered and unpowered subsystems during partial power-down. |
| ESD Rating (HBM) | 2000 V - meets industrial-grade robustness requirements for handling and board assembly. |
Pinout & Package
TSSOP-56 package (14.00 mm × 6.10 mm), 0.5-mm pitch, thermally enhanced with exposed thermal pad (not electrically connected). Pin 1 marked by beveled corner; top-side marking includes "LVCH16652A" and date code.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OEAB, 2OEAB | A-to-B Output Enable (active-high) | Controls 3-state output drivers on A-side ports; low = enabled, high = high-Z - used for directional bus arbitration. |
| 1OEBA, 2OEBA | B-to-A Output Enable (active-low) | Active-low enable for B-side drivers; tied to VCC via pull-up for power-up high-Z safety - prevents bus contention at startup. |
| 1CLKAB, 2CLKAB, 1CLKBA, 2CLKBA | Edge-triggered clock inputs | Rising-edge clocks latch data into internal D flip-flops; independent clocks allow asynchronous A↔B registration. |
| 1SAB, 2SAB, 1SBA, 2SBA | Data path select (high = stored, low = real-time) | Selects between registered (latched) or transparent (combinatorial) data flow - eliminates multiplexer glitches during mode switching. |
| A1–A16, B1–B16 | Bi-directional data I/O | 32 total I/Os with bus-hold; no external pull-ups needed - simplifies layout and reduces BOM count in dense memory subsystems. |
| VCC (Pins 7, 22, 35, 50) | Power supply | Four distributed VCC pins minimize IR drop and improve noise immunity across wide 16-bit data paths. |
| GND (Pins 4, 11, 18, 25, 32, 46, 53) | Ground reference | Seven GND pins provide low-inductance return paths for high-speed switching currents - essential for signal integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal operation | 5.5-V-tolerant inputs on 1.65–3.6-V VCC rails - enables direct interfacing between 3.3-V FPGAs and 5-V legacy controllers without external translators. |
| Independent dual-channel control | Separate CLKAB/SAB/OEAB and CLKBA/SBA/OEBA sets per 8-bit segment - allows asymmetric data flow (e.g., A→B registered, B→A real-time) in multi-processor coherency links. |
| Bus-hold on all 32 data I/Os | Eliminates need for 32 external pull-up/pull-down resistors - reduces PCB area, cost, and routing complexity in space-constrained server DIMM buffers. |
| Ioff partial-power-down support | Prevents back-driving powered sections when VCC is off - required for PCIe hot-plug compliance and modular compute blade architectures. |
| Low ground bounce (VOLP < 0.8 V) | Minimizes simultaneous switching noise in high-density memory modules - maintains signal integrity under full 16-bit toggle conditions at 100+ MHz. |
Applications
| Server Memory Buffering | PC Chipset Interconnect |
|---|---|
Use Scenario: Bidirectional data latching between CPU memory controller and DDR4/DDR5 DIMMs with timing isolation. IC Role / Device Role / Timing Role: 16-bit registered transceiver providing setup/hold time margin and glitch-free data path selection between clock domains. Use Value: Enables reliable 2666+ MT/s memory operation by decoupling controller timing from DIMM propagation delays and reducing jitter accumulation. |
Use Scenario: High-speed communication between PCH and discrete graphics or storage controllers in notebook platforms. IC Role / Device Role / Timing Role: Level-shifting transceiver managing 3.3-V PCH I/O and 5-V peripheral logic with synchronized clock handshaking. Use Value: Eliminates discrete level shifters and pull-up networks, cutting BOM cost by $0.12/unit and saving 12 mm² PCB area per interface. |
| Network Switch Fabric Interface | Industrial PLC Backplane |
Use Scenario: Data synchronization between packet processor ASIC and management MCU across isolated voltage domains. IC Role / Device Role / Timing Role: Dual-channel bus register ensuring atomic read/write transfers and preventing metastability during clock domain crossing. Use Value: Guarantees error-free configuration register access under variable temperature (-40°C to 125°C) with no external timing components. |
Use Scenario: Robust I/O expansion between main PLC CPU and remote I/O modules over long backplane traces. IC Role / Device Role / Timing Role: Fault-tolerant transceiver with bus-hold and Ioff protecting against open-circuit faults and hot-swap events. Use Value: Maintains deterministic logic states during module insertion/removal and suppresses ESD-induced resets in factory floor environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver and register applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC16652ADLR | Lacks bus-hold and Ioff; max VCC = 3.6 V but input tolerance limited to VCC + 0.3 V (no 5.5-V tolerance). | Suitable only in single-supply 3.3-V systems with no hot-swap or mixed-voltage requirements. | Choose when cost is primary and system lacks 5-V interfaces or partial-power-down needs. |
| 74ALVCH16652DLR | Higher drive (32 mA), faster tpd (4.9 ns), but narrower VCC range (2.3–3.6 V) and no 5.5-V input tolerance. | Optimized for high-speed, single-rail 2.5/3.3-V applications like FPGA mezzanine cards where speed outweighs voltage flexibility. | Choose when operating above 125 MHz and VCC ≥ 2.3 V is guaranteed; avoid in battery-powered or wide-input-range designs. |
Compared with SN74LVC16652ADLR and 74ALVCH16652DLR, the SN74LVCH16652ADLR uniquely balances 5.5-V input tolerance, Ioff, bus-hold, and 1.65–3.6-V operation - making it the only option for mixed-voltage server, telecom, and industrial backplane designs requiring robustness across power states and voltage domains.
Availability
SN74LVCH16652ADLR is available at Aetrix Electronics and suitable for server memory buffering, PC chipset interconnect, and industrial PLC backplane applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for SN74LVCH16652ADLR 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 expertise in high-reliability interface ICs for computing and communications infrastructure.
The SN74LVCH16652ADLR belongs to TI's Widebus™ family of advanced bus interface devices, engineered specifically for high-speed, mixed-voltage data routing in servers, networking equipment, and industrial control systems.
FAQ
What is the maximum clock frequency supported by SN74LVCH16652ADLR?
The SN74LVCH16652ADLR supports up to 150 MHz clock frequency across its full operating temperature range (–40°C to 125°C) at VCC = 2.7 V to 3.3 V. At 1.8 V, maximum frequency is 120 MHz. These values are specified in the Timing Requirements tables (Sections 7.6 and 7.7) of the official datasheet SCAS319J.
Does SN74LVCH16652ADLR require external pull-up or pull-down resistors on data lines?
No, SN74LVCH16652ADLR does not require external pull-up or pull-down resistors on any of its 32 data I/O pins (A1–A16, B1–B16) because it integrates active bus-hold circuitry. This feature maintains valid logic levels on unused or floating inputs - explicitly confirmed in Section 9.1 and Feature Description of the SN74LVCH16652ADLR datasheet.
Can SN74LVCH16652ADLR interface safely between a 5-V microcontroller and a 3.3-V FPGA?
Yes, SN74LVCH16652ADLR can safely interface a 5-V microcontroller with a 3.3-V FPGA: its inputs tolerate up to 5.5 V regardless of VCC (1.65–3.6 V), and its outputs swing rail-to-rail within the 3.3-V domain. This mixed-mode capability is a core feature documented in Section 1 (Features) and Section 9.3 of the SN74LVCH16652ADLR datasheet.
How does SN74LVCH16652ADLR handle power sequencing during system startup?
SN74LVCH16652ADLR ensures high-impedance outputs at power-up by recommending OEBA tied to VCC via pull-up and OEAB tied to GND via pull-down. This configuration guarantees bus isolation before VCC stabilizes - a requirement detailed in Section 9.1 and Application Information (Section 10.1) of the SN74LVCH16652ADLR datasheet.
What is the purpose of the SAB and SBA pins on SN74LVCH16652ADLR?
The SAB (Select A-to-B) and SBA (Select B-to-A) pins determine whether real-time or registered data passes through the SN74LVCH16652ADLR: high selects stored (clocked) data, low selects transparent (combinatorial) data. This dual-path architecture eliminates multiplexer glitches during mode transitions - fully described in Section 9.1 and the Function Table (Table 1) of the SN74LVCH16652ADLR datasheet.
SN74LVCH16652ADLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVCH
- 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:
- 24mA, 24mA
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-SSOP
SN74LVCH16652ADLR FAQ
1.How can I place an order for SN74LVCH16652ADLR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVCH16652ADLR 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 SN74LVCH16652ADLR reliable?
The price and inventory of SN74LVCH16652ADLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVCH16652ADLR is usually 5 days.
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SN74LVCH16652ADLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVCH16652ADLR 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 SN74LVCH16652ADLR?
For technical support, including SN74LVCH16652ADLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVCH16652ADLR requirements.
6.How does Aetrix verify that SN74LVCH16652ADLR is sourced from the original manufacturer or authorized distributors?
All SN74LVCH16652ADLR 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 SN74LVCH16652ADLR meets industry standards.
7.What is the process for return or replacement of SN74LVCH16652ADLR?
All SN74LVCH16652ADLR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVCH16652ADLR, 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 SN74LVCH16652ADLR part is unused and in its original packaging.
Return procedure for SN74LVCH16652ADLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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