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Texas Instruments SN74LVCH16540ADL
- Part No.:
- SN74LVCH16540ADL
- Manufacturer:
- Texas Instruments
- Package:
- 48-BSSOP (0.295", 7.50mm Width)
- Datasheet:
-
SN74LVCH16540ADL.pdf
- Description:
- IC BUFFER INVERT 3.6V 48SSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74LVCH16540ADL from Texas Instruments is a 16-bit noninverting buffer/driver with dual 3-state outputs, designed for 1.65 V to 3.6 V VCC operation and supporting mixed-mode 5-V input tolerance. It delivers 3.7 ns max propagation delay at 3.3 V, ±24 mA output drive, bus-hold on all data inputs, and Ioff partial-power-down protection - used in high-speed memory address/data bus interfacing and level translation between 3.3-V and 5-V subsystems.
For engineers reviewing the SN74LVCH16540ADL datasheet, SN74LVCH16540ADL pinout, SN74LVCH16540ADL application, or SN74LVCH16540ADL equivalent, key selection considerations include 48-pin SSOP (DL) package compatibility, dual independent 8-bit 3-state control (OE1/OE2), bus-hold elimination of external resistors, and guaranteed 5.5-V-tolerant inputs with 1.65–3.6-V supply range.
Technical Context
This device implements two independent 8-bit noninverting buffer sections, each with active-low 2-input AND-gated 3-state control (OE1/OE2). Outputs enter high-impedance state if either OE input is high, enabling precise per-section bus isolation.
It supports true mixed-voltage operation: inputs accept up to 5.5 V regardless of VCC (1.65–3.6 V), allowing direct connection to 5-V logic while powered from 3.3-V or 1.8-V rails. Bus-hold circuitry actively maintains valid logic states on undriven inputs without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - enables interoperability across low-voltage embedded systems including 1.8-V and 3.3-V domains. |
| Input Voltage Tolerance | Up to 5.5 V - allows direct interface with legacy 5-V logic without level shifters. |
| Max Propagation Delay | 3.7 ns at VCC = 3.3 V - supports >200 MHz bus timing in high-speed memory and peripheral interfaces. |
| Output Drive Strength | ±24 mA at VCC = 3.0 V - drives standard TTL loads and multiple CMOS inputs with margin. |
| Ioff Current | ±10 µA at VI/VO = 5.5 V - prevents backflow current during partial power-down, protecting unpowered system sections. |
| Bus-Hold Current | ±45 µA at VCC = 2.3 V - actively holds floating inputs at valid logic levels, eliminating need for pullup/pulldown resistors. |
| ESD Protection | 2000-V HBM, 1000-V CDM - meets industrial-grade robustness requirements for board-level handling and operation. |
Pinout & Package
SN74LVCH16540ADL uses a 48-pin Shrink Small-Outline Package (SSOP-DL), 12.4 mm × 6.0 mm body, 0.5 mm pitch, 1.2 mm max height, RoHS-compliant NiPdAu lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE1, 1OE2, 2OE1, 2OE2 | Active-low 3-state enable inputs (per 8-bit section) | AND-gated control: outputs go high-Z if either OE in a pair is high - enables independent gating of two 8-bit buses. |
| 1A1–1A8, 2A1–2A8 | Data inputs (two 8-bit groups) | 5.5-V-tolerant CMOS inputs with bus-hold - accept 1.65–5.5 V signals; maintain state when floating. |
| 1Y1–1Y8, 2Y1–2Y8 | Noninverting buffered outputs (two 8-bit groups) | 3-state CMOS outputs with ±24 mA drive - drive transmission lines or fan-out to multiple loads. |
| VCC (Pins 7, 18, 29, 40) | Power supply | Four distributed VCC pins reduce switching noise and improve power integrity across wide bus. |
| GND (Pins 4, 11, 22, 33, 44) | Ground reference | Five GND pins provide low-inductance return paths, critical for signal integrity in 16-bit parallel interfaces. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage translation | 5.5-V-tolerant inputs operate with VCC as low as 1.65 V - eliminates external level shifters in 3.3/5-V hybrid systems. |
| Bus-hold circuitry | Active retention of last-valid logic state on all A-inputs - removes requirement for 10-kΩ pullup/pulldown resistors. |
| Ioff partial-power-down support | Outputs disabled and isolated when VCC = 0 V - prevents back-current damage in hot-swap or multi-rail power sequencing. |
| Low ground bounce (VOLP) | Typical <0.8 V at VCC = 3.3 V - minimizes noise coupling into shared ground planes during simultaneous switching. |
| High noise immunity | VIL = 0.35×VCC (min), VIH = 0.65×VCC (min) - ensures reliable logic thresholds across full VCC and temperature range. |
Applications
| Memory Address Buffering | PCI/ISA Bus Interface |
|---|---|
|
Use Scenario: Driving 16-bit address lines from a low-voltage microcontroller to SRAM or Flash memory operating at higher voltage or longer trace lengths. IC Role / Device Role / Timing Role: Noninverting buffer with 3-state control isolates CPU address bus during DMA cycles and provides drive strength for capacitive loads. Use Value: 3.7 ns tpd ensures setup/hold timing compliance; bus-hold prevents address glitches during reset or sleep transitions. |
Use Scenario: Interfacing a 3.3-V FPGA or ASIC to legacy 5-V PCI or ISA peripheral cards requiring bidirectional data buffering. IC Role / Device Role / Timing Role: Level-translating buffer enabling safe 5-V signal reception while powered from 3.3-V rail, with per-bus 3-state control for arbitration. Use Value: 5.5-V input tolerance and Ioff allow live insertion; dual OE pairs support independent read/write bus gating. |
| Industrial Backplane Interface | Test Equipment Signal Conditioning |
|
Use Scenario: Isolating and driving 16-bit parallel control/data lines across noisy industrial backplanes with long interconnects and variable ground potentials. IC Role / Device Role / Timing Role: Robust bus driver with high ESD rating and ground-bounce suppression, placed at backplane edge connector to condition signals entering main controller. Use Value: 2000-V HBM ESD rating withstands field handling; distributed VCC/GND pins minimize ground loop noise coupling. |
Use Scenario: Providing clean, high-fanout buffered outputs from pattern generators or logic analyzers to DUTs with diverse voltage requirements. IC Role / Device Role / Timing Role: Precision timing buffer with sub-4 ns delay and matched rise/fall characteristics, used to replicate clock or strobe signals across multiple test points. Use Value: Low skew and tight tpd spec ensure deterministic timing across all 16 outputs; 3-state enables dynamic reconfiguration of test node assignments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC16244ADGGR | Lower drive (±24 mA only at VCC ≥ 2.7 V); no bus-hold; 48-pin TSSOP only | Lacks 5.5-V input tolerance and bus-hold - requires external resistors and level-shifting for 5-V interfacing | Choose when cost sensitivity outweighs mixed-voltage flexibility and board space permits pullups. |
| 74ALVCH16540MTD | Same pinout/function but higher VCC max (3.6 V), identical bus-hold/Ioff; offered in TSSOP only (no DL option) | Functionally identical but unavailable in SSOP-DL package - incompatible with existing DL-footprint PCBs | Use only if redesigning for TSSOP and sourcing from ON Semiconductor; not drop-in for SN74LVCH16540ADL layouts. |
Compared with SN74LVCH16540ADL, SN74LVC16244ADGGR lacks 5-V input tolerance and bus-hold, increasing BOM count and layout complexity, while 74ALVCH16540MTD matches functionality but forces package migration away from SSOP-DL - making SN74LVCH16540ADL uniquely suited for legacy DL-based designs requiring mixed-voltage robustness.
Availability
SN74LVCH16540ADL is available at Aetrix Electronics and suitable for memory subsystems, industrial backplane interfaces, and mixed-voltage test equipment requiring stable component supply, long-term obsolescence management, and SSOP-DL footprint compatibility.
Supply support for SN74LVCH16540ADL 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
SN74LVCH16540ADL belongs to TI's Widebus™ family of high-speed, low-voltage interface ICs engineered specifically for robust 16-bit parallel bus conditioning in mixed-voltage embedded systems.
FAQ
What is the maximum input voltage rating for SN74LVCH16540ADL?
The SN74LVCH16540ADL supports input voltages up to 5.5 V regardless of VCC level, enabling direct connection to 5-V logic families while operating from 1.65–3.6-V supplies. This specification is guaranteed across the full operating temperature range (–40°C to 85°C) and is explicitly defined in the Absolute Maximum Ratings table of the official TI datasheet SCAS569H.
Does SN74LVCH16540ADL require external pullup resistors on its inputs?
No, SN74LVCH16540ADL does not require external pullup or pulldown resistors because it integrates active bus-hold circuitry on all data inputs (1A1–1A8 and 2A1–2A8). This feature maintains the last-valid logic state on undriven inputs, and TI explicitly advises against using external resistors with bus-hold enabled, as they may interfere with proper operation.
What is the propagation delay of SN74LVCH16540ADL at 1.8 V supply?
At VCC = 1.8 V, the SN74LVCH16540ADL has a maximum propagation delay (tpd) of 4.5 ns, as specified in the Switching Characteristics table under "VCC = 1.8 V" column. This value is measured under standard load conditions (CL = 30 pF, RL = 500 Ω) and applies to both rising and falling edges of the output relative to input transitions.
Can SN74LVCH16540ADL be used in partial-power-down applications?
Yes, SN74LVCH16540ADL supports partial-power-down operation via its Ioff feature: when VCC = 0 V, the Ioff circuitry disables all outputs and limits input/output leakage to ±10 µA, preventing damaging current backflow. This capability is verified per JESD 78 and is essential for hot-swap and multi-rail power sequencing scenarios involving the SN74LVCH16540ADL.
What package type and dimensions does SN74LVCH16540ADL use?
SN74LVCH16540ADL uses the SSOP-DL package: 48-pin shrink small-outline plastic package, 12.4 mm × 6.0 mm body size, 0.5 mm lead pitch, and 1.2 mm maximum height. Mechanical drawings confirm pin 1 location, seating plane, and gage plane alignment per JEDEC MO-153, and the tube packaging contains 25 units per tube as documented in TI's packaging addendum.
SN74LVCH16540ADL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVCH
- Package/Case:
- 48-BSSOP (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- Buffer, 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-SSOP
SN74LVCH16540ADL FAQ
1.How can I place an order for SN74LVCH16540ADL through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVCH16540ADL 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 SN74LVCH16540ADL reliable?
The price and inventory of SN74LVCH16540ADL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVCH16540ADL is usually 5 days.
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Once your SN74LVCH16540ADL 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 SN74LVCH16540ADL?
For technical support, including SN74LVCH16540ADL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVCH16540ADL requirements.
6.How does Aetrix verify that SN74LVCH16540ADL is sourced from the original manufacturer or authorized distributors?
All SN74LVCH16540ADL 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 SN74LVCH16540ADL meets industry standards.
7.What is the process for return or replacement of SN74LVCH16540ADL?
All SN74LVCH16540ADL units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVCH16540ADL, 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 SN74LVCH16540ADL part is unused and in its original packaging.
Return procedure for SN74LVCH16540ADL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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