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Texas Instruments 74LVCHR16245AZQLR
- Part No.:
- 74LVCHR16245AZQLR
- Manufacturer:
- Texas Instruments
- Package:
- 56-VFBGA
- Datasheet:
-
74LVCHR16245AZQLR.pdf
- Description:
- IC TXRX NON-INVERT 3.6V 56BGA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
74LVCHR16245AZQLR from Texas Instruments is a 16-bit dual-octal noninverting bus transceiver designed for asynchronous bidirectional data transfer between 1.65-V to 3.6-V buses. It features 5.5-V tolerant inputs, 26-Ω integrated output series resistors, bus-hold on all data I/Os, and Ioff support for live insertion. It enables mixed-voltage interfacing-e.g., connecting a 3.3-V microcontroller to a 5-V peripheral bus in telecom infrastructure backplanes.
For engineers reviewing the 74LVCHR16245AZQLR datasheet, 74LVCHR16245AZQLR pinout, 74LVCHR16245AZQLR application, or 74LVCHR16245AZQLR equivalent, this page delivers verified electrical specs, functional mode behavior, package-specific terminal mapping, real-world use cases, and validated alternative parts-all grounded in TI's SCAS582Q revision Q datasheet and official orderable addendum.
Technical Context
The 74LVCHR16245AZQLR implements two independent 8-bit transceiver sections, each with dedicated DIR and OE controls. Direction is determined per section by logic level on 1DIR/2DIR, while 1OE/2OE independently enable or isolate each 8-bit port pair (A↔B). All I/Os feature bus-hold circuitry that actively maintains valid logic states without external resistors.
It supports true mixed-mode signal operation: inputs tolerate up to 5.5 V regardless of VCC (1.65–3.6 V), enabling down-translation from 5-V systems into 3.3-V domains. The Ioff specification ensures zero current backflow when VCC = 0 V, satisfying partial-power-down requirements in hot-swap applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - Enables operation across low-voltage embedded rails including 1.8 V, 2.5 V, and 3.3 V systems. |
| Input Voltage Tolerance | Up to 5.5 V - Allows direct connection to legacy 5-V logic without level-shifting components. |
| Max Propagation Delay | 4.8 ns at VCC = 3.3 V - Supports high-speed data transfer in timing-critical backplane and memory interface designs. |
| Output Series Resistance | 26 Ω (integrated) - Reduces overshoot/undershoot and eliminates need for external termination resistors. |
| Bus-Hold Current | ±45 µA at VI = 1.7 V (3 V VCC) - Actively holds floating data lines at valid logic levels, removing external pullup/pulldown requirements. |
| Ioff Leakage | ±10 µA at VI/VO = 5.5 V, VCC = 0 V - Prevents damaging back-current during power sequencing or hot-plug events. |
| Operating Temperature | –40°C to +125°C - Qualified for industrial and extended-temperature telecom and transportation equipment. |
Pinout & Package
The 74LVCHR16245AZQLR is packaged in a 56-ball ZQL (microstar BGA) with 0.5-mm pitch and 7.0 mm × 4.5 mm body size. This RoHS-compliant, lead-free package supports fine-pitch PCB assembly and thermal performance suitable for dense industrial modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 2DIR | Direction control input (per 8-bit section) | Determines data flow direction: LOW = B→A, HIGH = A→B; enables independent bidirectional control of two 8-bit channels. |
| 1OE, 2OE | Output enable input (per 8-bit section) | Active-LOW enable: asserted LOW activates transceiver; HIGH forces both A and B ports into high-impedance isolation state. |
| 1A1–1A8, 2A1–2A8 | Data I/O port A (input/output) | First and second 8-bit data bus side A; includes bus-hold and 5.5-V tolerant inputs; outputs drive with 26-Ω series resistance. |
| 1B1–1B8, 2B1–2B8 | Data I/O port B (input/output) | First and second 8-bit data bus side B; electrically identical to port A; supports full bidirectional translation between A and B sides. |
| VCC | Power supply | Single 1.65–3.6-V supply powering internal logic and I/O buffers; multiple VCC balls ensure low-impedance distribution. |
| GND | Ground reference | Multiple ground balls distributed across package to minimize ground bounce and improve noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-voltage translation | 5.5-V tolerant inputs operate reliably with VCC as low as 1.65 V-enables seamless interfacing between 5-V legacy peripherals and modern 3.3-V/2.5-V controllers. |
| Integrated 26-Ω output resistors | Eliminates need for 16 external series termination resistors, reducing BOM count, board area, and signal integrity tuning effort. |
| Active bus-hold on all I/Os | Maintains stable logic states on unused or floating data lines without external biasing-critical for robustness in modular backplane systems. |
| Ioff partial-power-down support | Prevents current backflow when VCC = 0 V, allowing safe insertion/removal in powered-backplane environments like telecom line cards. |
| Low ground bounce (VOLP & VOHV) | Typical VOLP < 0.8 V and VOHV > 2 V at VCC = 3.3 V-ensures clean switching margins and reduces EMI in high-density digital systems. |
Applications
| Telecom Backplane Interface | Industrial PLC I/O Expansion |
|---|---|
Use Scenario: Interfacing a 3.3-V FPGA-based control module to legacy 5-V peripheral cards in a carrier-grade telecom shelf. IC Role / Device Role / Timing Role: Bidirectional voltage-translating bus transceiver managing synchronous data exchange between mismatched voltage domains. Use Value: Eliminates discrete level shifters and pull-up networks while maintaining signal integrity across 16-bit parallel control/data paths at ≤4.8 ns propagation delay. |
Use Scenario: Extending I/O capacity between a 2.5-V ARM-based PLC CPU and 5-V field sensors/actuators via modular I/O carrier boards. IC Role / Device Role / Timing Role: Isolated, direction-controlled data bridge with bus-hold protection against intermittent connector disconnection. Use Value: Ensures deterministic logic states during hot-swap events and prevents spurious actuation due to floating inputs-no external hold resistors required. |
| Server Memory Subsystem | Test Equipment Data Bus |
Use Scenario: Buffering address/control signals between a 1.8-V DDR4 memory controller and 3.3-V register-based RDIMM modules. IC Role / Device Role / Timing Role: Low-skew, high-drive-strength transceiver supporting fast turnaround times and precise timing alignment. Use Value: Integrated 26-Ω resistors suppress reflections on stub-loaded memory bus traces, improving setup/hold margin without layout iteration. |
Use Scenario: Routing parallel test patterns between a 3.3-V pattern generator and DUTs operating at 5-V logic levels in automated test equipment (ATE). IC Role / Device Role / Timing Role: Programmable-direction, isolated bus coupler enabling flexible stimulus/response path configuration. Use Value: Dual independent OE/DIR controls allow dynamic reconfiguration of data flow direction mid-test, reducing fixture complexity and test time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC16245A | No bus-hold; no 5.5-V tolerant inputs; max VCC = 3.6 V but inputs limited to VCC + 0.3 V. | Suitable only in uniform 3.3-V systems without floating inputs or mixed-voltage interfaces. | Select when cost sensitivity outweighs need for bus-hold or 5-V tolerance-and system guarantees controlled I/O biasing. |
| 74ALVCH16245 | Wider VCC range (1.65–3.6 V); same bus-hold and Ioff; slightly higher tpd (5.2 ns @ 3.3 V) and lower drive strength (8 mA vs 12 mA). | Better suited for ultra-low-power portable instrumentation where marginal speed reduction is acceptable. | Choose when lower static current (ICC = 10 µA typical) is prioritized over maximum throughput in battery-operated test gear. |
Compared with SN74LVC16245A and 74ALVCH16245, the 74LVCHR16245AZQLR uniquely combines 5.5-V input tolerance, active bus-hold, and 12-mA drive in a single 56-ball BGA-making it the only option among the three qualified for uncontrolled mixed-voltage backplane interconnects requiring zero external biasing.
Availability
74LVCHR16245AZQLR is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLC expansion, server memory subsystems, and automated test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74LVCHR16245AZQLR 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 and embedded processing solutions, with decades of expertise in logic interface ICs and industrial-grade reliability validation.
The 74LVCHR16245AZQLR belongs to TI's Widebus™ family-designed specifically for high-speed, mixed-voltage, hot-pluggable bus interfacing in telecom, computing, and industrial automation systems.
FAQ
What is the maximum input voltage the 74LVCHR16245AZQLR can tolerate?
The 74LVCHR16245AZQLR accepts input voltages up to 5.5 V across its entire specified VCC range (1.65 V to 3.6 V). This overvoltage tolerance is guaranteed per TI's SCAS582Q datasheet Section 7.1 and enables direct interfacing with 5-V logic without external level shifters-critical for legacy system integration.
Does the 74LVCHR16245AZQLR require external pull-up or pull-down resistors on unused data lines?
No. The 74LVCHR16245AZQLR integrates active bus-hold circuitry on all A and B port I/Os, which maintains valid logic states on floating inputs without external resistors. Per Section 9.1 of the datasheet, using external biasing with bus-hold enabled is not recommended and may cause contention or increased power draw.
What is the function of the Ioff specification for the 74LVCHR16245AZQLR?
The Ioff specification ensures that when VCC = 0 V, leakage current into or out of any I/O pin remains ≤ ±10 µA-even if pins are driven to 5.5 V. This protects downstream circuitry during hot-swap or partial-power-down events and is explicitly validated per JESD78, making the 74LVCHR16245AZQLR suitable for live-insertion applications such as telecom line cards.
How does the 26-Ω integrated series resistor in the 74LVCHR16245AZQLR improve signal integrity?
The 26-Ω on-die series resistor dampens signal edge ringing and reduces overshoot/undershoot on transmission lines-especially beneficial in unterminated or stub-loaded bus topologies. As confirmed in Section 7.5 of the datasheet, this eliminates the need for 16 discrete 24–33-Ω SMT resistors, simplifying layout and enhancing timing margin without sacrificing drive strength (12 mA sink/source).
Can the 74LVCHR16245AZQLR be used as two independent 8-bit transceivers?
Yes. The 74LVCHR16245AZQLR contains two fully independent 8-bit transceiver sections (1A/1B and 2A/2B), each with dedicated DIR and OE controls. Section 9.4's Function Table confirms separate operation: asserting 1OE while holding 2OE high isolates only the first 8-bit channel, enabling concurrent bidirectional and isolated data paths on a single device.
74LVCHR16245AZQLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVCHR
- Package/Case:
- 56-VFBGA
- 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:
- 12mA, 12mA
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-BGA Microstar Junior (7x4.5)
74LVCHR16245AZQLR FAQ
1.How can I place an order for 74LVCHR16245AZQLR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LVCHR16245AZQLR 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 74LVCHR16245AZQLR reliable?
The price and inventory of 74LVCHR16245AZQLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVCHR16245AZQLR is usually 5 days.
3.What payment methods are accepted for 74LVCHR16245AZQLR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVCHR16245AZQLR transactions.
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4.How is shipping managed for 74LVCHR16245AZQLR?
74LVCHR16245AZQLR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LVCHR16245AZQLR 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 74LVCHR16245AZQLR?
For technical support, including 74LVCHR16245AZQLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVCHR16245AZQLR requirements.
6.How does Aetrix verify that 74LVCHR16245AZQLR is sourced from the original manufacturer or authorized distributors?
All 74LVCHR16245AZQLR 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 74LVCHR16245AZQLR meets industry standards.
7.What is the process for return or replacement of 74LVCHR16245AZQLR?
All 74LVCHR16245AZQLR units undergo pre-shipment inspection (PSI). If there is an issue with 74LVCHR16245AZQLR, 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 74LVCHR16245AZQLR part is unused and in its original packaging.
Return procedure for 74LVCHR16245AZQLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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