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Texas Instruments 74AVCAH164245ZQLR
- Part No.:
- 74AVCAH164245ZQLR
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
74AVCAH164245ZQLR.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL 56BGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,854
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Product details
Overview
74AVCAH164245ZQLR from Texas Instruments is a 16-bit dual-supply bus transceiver with configurable voltage translation, supporting 1.4 V to 3.6 V on both A and B ports, ±24 mA drive strength, Ioff partial-power-down protection, and bus-hold circuitry. It enables bidirectional level-shifting between mixed-voltage domains (e.g., 1.8 V ↔ 3.3 V) in high-speed digital interconnects.
For engineers reviewing the 74AVCAH164245ZQLR datasheet, 74AVCAH164245ZQLR pinout, 74AVCAH164245ZQLR application, or 74AVCAH164245ZQLR equivalent, this device is selected for low-noise, high-drive asynchronous bus bridging where supply rail independence, dynamic output control (DOC™), and robust floating-input handling are required.
Technical Context
This transceiver implements two independent 8-bit sections (1DIR/1OE and 2DIR/2OE), each supporting bidirectional data flow controlled by DIR and isolated via OE. Control inputs (DIR, OE) are referenced to VCCA, ensuring consistent logic thresholds regardless of VCCB level.
The DOC™ circuitry dynamically modulates output impedance during signal transitions-lowering it initially for fast edge drive, then raising it to suppress switching noise without sacrificing propagation speed. Bus-hold circuitry actively maintains valid logic states on unused A/B data inputs, eliminating external bias resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage range (VCCA/VCCB) | 1.4 V to 3.6 V per rail - enables interoperability across 1.5 V, 1.8 V, 2.5 V, and 3.3 V logic domains without level-shifters. |
| Output drive (IOH/IOL) | ±24 mA at 2.5 V VCC - delivers standard-output drive strength while maintaining low-voltage operation. |
| Propagation delay (tpd) | 1.3 ns to 6.8 ns (VCCA/VCCB = 1.8 V/2.5 V) - supports >100 MHz bus timing in typical mixed-rail configurations. |
| Ioff current | ±10 µA max when either VCC = 0 V - prevents backflow current during partial power-down, protecting powered subsystems. |
| Bus-hold input current | ±100 µA to ±525 µA (VIN near VIL/VIH) - sustains stable logic levels on floating inputs without external components. |
| Dynamic Output Control | DOC™-enabled - reduces simultaneous switching noise (SSN) by adjusting output impedance mid-transition, preserving signal integrity. |
| ESD rating | 2000-V HBM, 200-V MM, 1000-V CDM - meets industrial-grade robustness requirements for board-level handling and operation. |
Pinout & Package
VFBGA–GQL package (48-pin, 5 mm × 6 mm, 0.5 mm pitch), bottom-side ball layout with exposed thermal pad. Pin 1 located at corner A2 (top-left per JEDEC-standard orientation).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 2DIR | Direction control input | Determines data flow direction per 8-bit section (L = B→A, H = A→B); referenced to VCCA. |
| 1OE, 2OE | Output enable input | Active-low; places associated port outputs in high-impedance state when high; referenced to VCCA. |
| 1A1–1A8, 2A1–2A8 | A-port data I/O | Track VCCA supply; accept 1.4–3.6 V logic; include bus-hold circuitry. |
| 1B1–1B8, 2B1–2B8 | B-port data I/O | Track VCCB supply; tolerate 1.4–3.6 V logic; overvoltage-tolerant up to 4.6 V. |
| VCCA, VCCB | Power supplies | Independent rails; each powers respective port logic and I/O; must be decoupled locally. |
| GND | Ground reference | Four dedicated GND pins (pins A4, A5, C3, C4 in GQL) reduce ground bounce in high-speed operation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail voltage translation | Full 1.4 V–3.6 V range on both A and B ports enables seamless interface between disparate logic families (e.g., 1.8 V FPGA ↔ 3.3 V peripheral). |
| Dynamic Output Control (DOC™) | Reduces simultaneous switching noise by 30–50% vs. fixed-drive outputs while maintaining sub-7 ns propagation delays. |
| Integrated bus-hold | Eliminates need for 10-kΩ pullup/pulldown resistors on unused data lines, saving PCB area and BOM cost. |
| Ioff partial-power-down | Prevents current backflow when one supply is off, enabling safe hot-swap and power sequencing in multi-rail systems. |
| Overvoltage-tolerant I/O | B-port pins withstand up to 4.6 V regardless of VCCB, allowing safe connection to higher-voltage buses during translation. |
Applications
| Industrial PLC Backplane Interface | FPGA-to-ASIC Voltage Bridging |
|---|---|
|
Use Scenario: Interfacing a 2.5 V FPGA I/O bank to legacy 3.3 V I/O modules on a programmable logic controller backplane. IC Role / Device Role / Timing Role: Bidirectional level translator with DIR-controlled data path and OE-isolated fault containment. Use Value: Eliminates discrete level-shifter ICs and external biasing, reducing component count by 3+ parts per channel while maintaining <7 ns timing margin. |
Use Scenario: Connecting a 1.8 V ASIC core to a 3.3 V memory controller in an embedded vision processing module. IC Role / Device Role / Timing Role: Asynchronous bus transceiver with independent VCCA/VCCB rails and DOC™-enhanced signal integrity. Use Value: Achieves clean 100+ MHz data transfer across voltage domains without added termination or shielding. |
| Low-Power Sensor Hub Aggregation | Automotive Body Control Module |
|
Use Scenario: Aggregating signals from multiple 1.5 V and 1.8 V environmental sensors into a 3.3 V microcontroller host via shared I²C/SPI bus. IC Role / Device Role / Timing Role: Dual-supply buffer with Ioff support for graceful shutdown of sensor subsystems during sleep mode. Use Value: Enables zero-current leakage during MCU deep-sleep, extending battery life in portable IoT nodes. |
Use Scenario: Isolating CAN transceiver logic-level signals (3.3 V) from a 5 V microcontroller domain in a body control unit. IC Role / Device Role / Timing Role: High-reliability bus isolator with 2000-V HBM ESD protection and latch-up immunity >100 mA. Use Value: Meets AEC-Q100 stress requirements for under-hood electronics without additional protection circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AVCH16T245RKR | 16-bit, dual-supply, but uses AVCH logic family with lower drive (±12 mA) and no DOC™ circuitry. | Lacks dynamic noise suppression; suitable only for lower-speed (<50 MHz), lower-noise environments. | Select when cost sensitivity outweighs noise performance and drive strength requirements. |
| SN74LVC16T245DGGR | Single-supply (1.65–3.6 V), no VCCA/VCCB separation; lacks Ioff and bus-hold features. | Cannot translate between mismatched rails; requires external pullups and power sequencing care. | Choose only for same-voltage-domain buffering where rail independence is unnecessary. |
Compared with SN74AVCH16T245RKR and SN74LVC16T245DGGR, the 74AVCAH164245ZQLR uniquely combines dual-rail translation, DOC™ noise control, and integrated bus-hold-making it the only option for robust, high-speed, mixed-voltage bus bridging without design compromises.
Availability
74AVCAH164245ZQLR is available at Aetrix Electronics and suitable for industrial PLC backplanes, FPGA-to-ASIC interfaces, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74AVCAH164245ZQLR 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 innovation in high-reliability interface ICs.
The 74AVCAH164245ZQLR belongs to TI's Widebus™ family of advanced bus interface devices, engineered specifically for low-noise, high-speed, mixed-voltage system interconnects in industrial, automotive, and communications infrastructure.
FAQ
What is the maximum allowable voltage on B-port pins when VCCB = 0 V?
The 74AVCAH164245ZQLR B-port pins tolerate up to 4.6 V regardless of VCCB state, per Absolute Maximum Ratings. This overvoltage tolerance allows safe connection to live buses during power sequencing or partial shutdown-critical in hot-swap and multi-rail systems where VCCB may be unpowered while signals remain active.
How does the DOC™ circuitry in the 74AVCAH164245ZQLR reduce noise without slowing down signals?
The DOC™ circuitry in the 74AVCAH164245ZQLR dynamically lowers output impedance at signal transition onset for strong edge drive, then raises it mid-transition to damp ringing and crosstalk. This preserves propagation delay (as low as 1.3 ns) while cutting simultaneous switching noise by up to 50% compared to fixed-drive outputs-verified in TI application report SCEA009.
Can the 74AVCAH164245ZQLR operate with VCCA = 1.5 V and VCCB = 3.3 V simultaneously?
Yes-the 74AVCAH164245ZQLR is explicitly designed for asymmetric dual-rail operation. With VCCA = 1.5 V and VCCB = 3.3 V, it translates data bidirectionally while maintaining full functionality: DIR/OE thresholds track VCCA, B-port I/O tolerates 3.3 V, and DOC™ ensures clean edges. Propagation delay remains ≤6.7 ns (A→B) per datasheet Figure 2.
Is external pull-up resistance required on OE pins for reliable power-up behavior in the 74AVCAH164245ZQLR?
Yes-TI recommends tying OE to VCCA through a pull-up resistor at power-up to ensure outputs remain in high-impedance state until firmware asserts control. The minimum resistor value depends on the driver's sink capability; for standard CMOS drivers, 10 kΩ is typical. This prevents bus contention during reset sequences, as detailed in Section 1 of the SCES396A datasheet.
Does the 74AVCAH164245ZQLR support hot-plug operation between powered and unpowered subsystems?
Yes-the 74AVCAH164245ZQLR supports hot-plug via its Ioff feature: when either VCCA or VCCB = 0 V, all outputs enter high-impedance and leakage stays below ±10 µA. This prevents damaging back-current flow into unpowered rails, enabling safe insertion/removal in modular backplanes and field-upgradeable systems per JESD78 Class II latch-up compliance.
74AVCAH164245ZQLR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AVCAH
- Package/Case:
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Translator Type:
- Voltage Level
- Channel Type:
- Bidirectional
- Number of Circuits:
- 2
- Channels per Circuit:
- 8
- Voltage - VCCA:
- 1.4 V ~ 3.6 V
- Voltage - VCCB:
- 1.4 V ~ 3.6 V
- Input Signal:
- -
- Output Signal:
- -
- Output Type:
- Tri-State, Non-Inverted
- Data Rate:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Features:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 56-VFBGA
74AVCAH164245ZQLR FAQ
1.How can I place an order for 74AVCAH164245ZQLR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AVCAH164245ZQLR 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 74AVCAH164245ZQLR reliable?
The price and inventory of 74AVCAH164245ZQLR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AVCAH164245ZQLR is usually 5 days.
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Once your 74AVCAH164245ZQLR 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 74AVCAH164245ZQLR?
For technical support, including 74AVCAH164245ZQLR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AVCAH164245ZQLR requirements.
6.How does Aetrix verify that 74AVCAH164245ZQLR is sourced from the original manufacturer or authorized distributors?
All 74AVCAH164245ZQLR 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 74AVCAH164245ZQLR meets industry standards.
7.What is the process for return or replacement of 74AVCAH164245ZQLR?
All 74AVCAH164245ZQLR units undergo pre-shipment inspection (PSI). If there is an issue with 74AVCAH164245ZQLR, 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 74AVCAH164245ZQLR part is unused and in its original packaging.
Return procedure for 74AVCAH164245ZQLR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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