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Texas Instruments SN74AVCAH164245G
- Part No.:
- SN74AVCAH164245G
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74AVCAH164245G.pdf
- Description:
- IC BUS TRANSCVR 16BIT 48TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:334
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Product details
Overview
SN74AVCAH164245G 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 VCCA and VCCB rails, delivering ±24 mA output drive, Ioff partial-power-down protection, and bus-hold on all data inputs. 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 SN74AVCAH164245G datasheet, SN74AVCAH164245G pinout, SN74AVCAH164245G application, or SN74AVCAH164245G equivalent, this device is critical for low-noise, high-integrity voltage-translation in FPGA-to-ASIC, processor-to-peripheral, and multi-rail SoC interface designs where dynamic drive control and power-state isolation are required.
Technical Context
The SN74AVCAH164245G implements a fully configurable dual-rail architecture: A-port logic levels track VCCA (1.4–3.6 V), B-port tracks VCCB (1.4–3.6 V), and control inputs (DIR, OE) are referenced solely to VCCA. Its 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 speed.
Each of its two independent 8-bit sections operates asynchronously with dedicated DIR and OE pins. Bus-hold circuitry eliminates external pull resistors on floating data lines, and Ioff ensures both ports enter high-impedance when either VCC rail drops to GND-enabling safe partial-power-down in hot-swap or power-gated systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA / VCCB Range | 1.4 V to 3.6 V each - enables universal translation among 1.5 V, 1.8 V, 2.5 V, and 3.3 V logic domains without external level-shifters. |
| Output Drive (IOH/IOL) | ±24 mA at 2.5 V - supports driving heavy capacitive loads or multiple CMOS inputs while maintaining signal integrity. |
| Propagation Delay (tpd) | 1.3 ns to 6.8 ns (VCCA/VCCB = 1.8 V/3.3 V) - ensures sub-7 ns latency for high-throughput data paths in real-time interfaces. |
| Ioff Current | ±10 µA max - prevents backflow current during power sequencing, protecting powered-down subsystems from damage. |
| Bus-Hold Input Current | IBHL up to –75 µA / IBHH up to +75 µA - actively maintains valid logic states on unused inputs, eliminating need for external biasing. |
| ESD Protection | 2000-V HBM, 200-V MM, 1000-V CDM - meets industrial-grade robustness requirements for board-level handling and field operation. |
| Operating Temperature | –40°C to +85°C - qualified for extended industrial environments including automotive infotainment and industrial PLC backplanes. |
Pinout & Package
TSSOP-48 (DGG) package: 12.6 mm × 6.2 mm × 1.2 mm body, 0.5 mm pitch, lead-free NiPdAu finish, MSL Level-1, RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1DIR, 2DIR | Direction control input (active-high) | Selects data flow direction per 8-bit section: LOW = B→A, HIGH = A→B; referenced to VCCA. |
| 1OE, 2OE | Output enable input (active-low) | Disables outputs to high-impedance state; tie to VCCA via pullup for power-up safety. |
| 1A1–1A8, 2A1–2A8 | A-port data I/O (VCCA-referenced) | Connect to lower-voltage domain (e.g., 1.8 V FPGA I/O); include bus-hold circuitry. |
| 1B1–1B8, 2B1–2B8 | B-port data I/O (VCCB-referenced) | Connect to higher-voltage domain (e.g., 3.3 V peripheral bus); overvoltage-tolerant up to 4.6 V. |
| VCCA, VCCB | Independent supply rails | VCCA powers control logic and A-port; VCCB powers B-port; each rail can be independently powered or sequenced. |
| GND | Ground reference | Four dedicated ground pins distributed across package for low-inductance return paths and noise reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail voltage translation | Supports simultaneous 1.4–3.6 V operation on both sides - enables seamless interoperability between legacy and next-gen logic families. |
| DOC™ dynamic output control | Reduces simultaneous switching noise by >30% vs. standard outputs while preserving 1.3 ns minimum propagation delay. |
| Integrated bus-hold | Eliminates external pullup/pulldown resistors on all 16 data lines - reduces BOM count, PCB area, and layout complexity. |
| Ioff partial-power-down | Prevents current backflow when either VCC rail is at 0 V - essential for hot-plug, power-gated, or battery-backed subsystems. |
| Overvoltage-tolerant I/O | Withstands up to 4.6 V on A/B ports regardless of VCCA/VCCB - allows safe interfacing with higher-voltage signals during fault conditions. |
Applications
| Processor-to-FPGA Interface | Multi-Rail Memory Subsystem |
|---|---|
Use Scenario: Interfacing a 1.8-V ARM Cortex-A series processor with a 3.3-V FPGA configuration interface. IC Role / Device Role / Timing Role: Bidirectional voltage translator managing configuration data and status handshake signals with sub-7 ns timing margin. Use Value: Eliminates discrete level-shifter ICs and associated passive components, reducing interface latency and board space by 40%. |
Use Scenario: Connecting a 2.5-V DDR2 memory controller to 1.5-V LPDDR2 SDRAM in portable medical imaging equipment. IC Role / Device Role / Timing Role: Dual-rail transceiver enabling synchronous read/write bursts across voltage domains with matched tpd skew <0.5 ns. Use Value: Maintains signal integrity under 200 MHz clock rates while supporting dynamic voltage scaling during low-power modes. |
| Industrial PLC Backplane | Automotive Infotainment Gateway |
Use Scenario: Isolating 3.3-V microcontroller I/O from 2.5-V sensor acquisition ASIC in a factory automation rack. IC Role / Device Role / Timing Role: Fault-tolerant bus interface providing Ioff protection during module hot-swap and bus-hold stability during sensor disconnect events. Use Value: Prevents system lockup during field maintenance and reduces firmware complexity for input state recovery. |
Use Scenario: Bridging 1.8-V ADAS camera processor outputs to 3.3-V display driver inputs in a head-up display unit. IC Role / Device Role / Timing Role: Low-noise, high-drive translator ensuring clean pixel clock and data edges despite shared noisy power rails. Use Value: DOC™ circuitry cuts EMI emissions by 12 dBµV/m in 30–100 MHz band, easing CISPR 25 Class 4 compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AVCH16T245 | Higher drive (±32 mA), no bus-hold, supports 1.2–3.6 V rails - lacks DOC™ noise suppression. | Preferred for ultra-high-capacitance buses (>30 pF/load) but requires external biasing for floating inputs. | Choose when maximum drive strength outweighs noise sensitivity and external resistor budget is acceptable. |
| TXB0108PWR | Auto-direction sensing, 8-bit only, 1.2–3.6 V, lower drive (±2 mA), no Ioff - uses different control architecture. | Suitable for simple unidirectional or auto-sensed protocols (e.g., I²C), not for high-speed bidirectional burst transfers. | Choose only for low-speed, low-current, space-constrained applications where direction control logic is undesirable. |
Compared with SN74AVCH16T245 and TXB0108PWR, the SN74AVCAH164245G uniquely combines high drive, integrated bus-hold, Ioff protection, and DOC™ noise control in a single 16-bit dual-rail solution-making it optimal for deterministic, high-reliability, mixed-voltage interconnects requiring minimal external components and strict EMI control.
Availability
SN74AVCAH164245G is available at Aetrix Electronics and suitable for processor-to-FPGA interfaces, multi-rail memory subsystems, and industrial PLC backplanes requiring stable component supply across extended temperature and long-lifecycle programs.
Supply support for SN74AVCAH164245G 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 technologies, with decades of expertise in high-reliability interface solutions.
The SN74AVCAH164245G belongs to TI's Widebus™ family of advanced bus interface devices, engineered specifically for low-noise, high-speed voltage translation in complex multi-rail digital systems.
FAQ
What voltage ranges does the SN74AVCAH164245G support on its VCCA and VCCB rails?
The SN74AVCAH164245G supports independent operation from 1.4 V to 3.6 V on both VCCA and VCCB. This range covers common logic voltages including 1.5 V, 1.8 V, 2.5 V, and 3.3 V, enabling flexible bidirectional translation without external circuitry. Operation outside this range may damage the SN74AVCAH164245G or violate absolute maximum ratings.
How does the DOC™ circuitry in the SN74AVCAH164245G reduce noise without slowing down signal edges?
The DOC™ circuitry in the SN74AVCAH164245G dynamically adjusts output impedance: it lowers impedance at signal transition onset for strong initial drive (matching ±24 mA capability), then raises it mid-transition to damp ringing and overshoot. This preserves sub-7 ns propagation delay while cutting simultaneous switching noise by up to 30% compared to standard outputs.
Can the SN74AVCAH164245G operate safely if only one supply rail (e.g., VCCA) is powered?
Yes - the SN74AVCAH164245G includes Ioff circuitry that forces both A and B ports into high-impedance when either VCCA or VCCB drops to GND. This prevents damaging current backflow and ensures safe partial-power-down operation, a key requirement for hot-swap and modular system architectures using the SN74AVCAH164245G.
Does the SN74AVCAH164245G require external pullup or pulldown resistors on its data inputs?
No - the SN74AVCAH164245G integrates active bus-hold circuitry on all 16 data inputs, which maintains valid logic states on floating or unused lines. Using external pull resistors with the SN74AVCAH164245G is explicitly discouraged in the datasheet, as it may interfere with bus-hold functionality and increase power consumption.
What is the maximum capacitive load the SN74AVCAH164245G can drive while maintaining specified timing?
The SN74AVCAH164245G is characterized with CL = 30 pF in timing tests, and its output structure supports loads up to 50 pF while staying within published tpd, ten, and tdis limits. For loads exceeding 50 pF, derating of timing margins and verification under actual operating conditions (VCCA/VCCB, temperature) is required to ensure reliable operation of the SN74AVCAH164245G.
SN74AVCAH164245G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- Packaging:
- Bulk
- Product Status:
- Active
- Translator Type:
- -
- Channel Type:
- -
- Number of Circuits:
- -
- Channels per Circuit:
- -
- Voltage - VCCA:
- -
- Voltage - VCCB:
- -
- Input Signal:
- -
- Output Signal:
- -
- Output Type:
- -
- Data Rate:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Features:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
SN74AVCAH164245G FAQ
1.How can I place an order for SN74AVCAH164245G through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AVCAH164245G 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 SN74AVCAH164245G reliable?
The price and inventory of SN74AVCAH164245G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AVCAH164245G is usually 5 days.
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Once your SN74AVCAH164245G 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 SN74AVCAH164245G?
For technical support, including SN74AVCAH164245G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AVCAH164245G requirements.
6.How does Aetrix verify that SN74AVCAH164245G is sourced from the original manufacturer or authorized distributors?
All SN74AVCAH164245G 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 SN74AVCAH164245G meets industry standards.
7.What is the process for return or replacement of SN74AVCAH164245G?
All SN74AVCAH164245G units undergo pre-shipment inspection (PSI). If there is an issue with SN74AVCAH164245G, 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 SN74AVCAH164245G part is unused and in its original packaging.
Return procedure for SN74AVCAH164245G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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