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Texas Instruments SN74AVCH2T45DCUR
- Part No.:
- SN74AVCH2T45DCUR
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74AVCH2T45DCUR.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL 8VSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74AVCH2T45 from Texas Instruments is a 2-bit, dual-supply bus transceiver enabling bidirectional voltage-level translation between 1.2V–3.6V domains (e.g., 1.8V ↔ 3.3V), featuring configurable direction control via DIR pin, 4.6V I/O tolerance, and active bus-hold on all data inputs. It supports high-speed communication in space-constrained portable electronics.
For engineers reviewing the SN74AVCH2T45 datasheet, SN74AVCH2T45 pinout, SN74AVCH2T45 application, or SN74AVCH2T45 equivalent, key selection criteria include its 2-rail supply flexibility (VCCA/VCCB independent), partial power-down (Ioff) capability, VCC isolation behavior, and NanoFree™ DSBGA package compatibility with fine-pitch PCB layouts.
Technical Context
The SN74AVCH2T45 implements a non-inverting, asynchronous bidirectional transceiver architecture with separate A- and B-port power rails (VCCA and VCCB), each supporting 1.2V to 3.6V. Direction is controlled solely by the DIR input referenced to VCCA, enabling A→B or B→A data flow without external OE signals.
Its core level-shifting operation relies on rail-to-rail input thresholds and output drive strength tied to respective supply voltages. The device guarantees Ioff ≤ ±5 µA when either VCC is at 0 V, and maintains high-impedance outputs under VCC isolation - critical for hot-swap and multi-voltage system interoperability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA / VCCB Range | 1.2V to 3.6V each - enables translation across 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V logic domains |
| I/O Voltage Tolerance | 4.6V - allows safe interfacing with higher-voltage peripherals without external clamping |
| Max Data Rate | 500 Mbps (1.8V → 3.3V) - supports high-throughput interconnects in smartphones and notebooks |
| Ioff Current | ±5 µA max - prevents backflow current during partial power-down, protecting powered subsystems |
| Bus-Hold Strength | IBHL ≥ 25 µA (low), IBHH ≥ –25 µA (high) - eliminates need for external pull resistors on floating inputs |
| Propagation Delay | tPLH/tPHL ≤ 3.1 ns (VCCA = VCCB = 1.2V) - ensures timing integrity in sub-ns-critical signal paths |
| ESD Rating | ±8 kV HBM - meets industrial and portable-device robustness requirements |
Pinout & Package
The SN74AVCH2T45DCUR uses the DCU (8-pin VSSOP) package: 3.10 mm × 2.00 mm, 0.65 mm pitch, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VCCA | Supply rail for A-side I/Os | Powers A1/A2 drivers and defines their output voltage levels and input thresholds |
| 2 A1 | Data I/O (A port) | Bidirectional signal path; output level follows VCCA, input threshold tracks VCCA |
| 3 A2 | Data I/O (A port) | Identical function to A1; supports 2-bit parallel translation |
| 4 GND | Reference ground | Common return for both supply rails and signal integrity reference plane |
| 5 DIR | Direction control input | Referenced to VCCA; low = B→A, high = A→B; no OE pin required |
| 6 B2 | Data I/O (B port) | Bidirectional signal path; output level follows VCCB, input threshold tracks VCCB |
| 7 B1 | Data I/O (B port) | Identical function to B2; completes 2-bit channel |
| 8 VCCB | Supply rail for B-side I/Os | Powers B1/B2 drivers and defines their output voltage levels and input thresholds |
Key Features
| Feature | Design Value |
|---|---|
| 2-Rail Level-Shifting | Independent VCCA (1.2–3.6V) and VCCB (1.2–3.6V) enable any-to-any low-voltage domain translation |
| VCC Isolation | If VCCA = GND or VCCB = GND, both A and B ports enter high-Z - prevents false logic assertion during power sequencing |
| Active Bus-Hold | Internal circuitry holds un-driven A1/A2/B1/B2 at valid logic states - eliminates external pull resistors and saves board area |
| Partial Power-Down (Ioff) | Outputs disable safely when either supply is off; Ioff ≤ ±5 µA prevents damaging back-current into live rails |
| NanoFree™ Packaging | Die-as-package construction (DSBGA variant) minimizes footprint and thermal resistance - ideal for ultra-thin mobile designs |
Applications
| Smartphone Baseband–Application Processor Interface | Server Memory Subsystem Voltage Translation |
|---|---|
Use Scenario: Interfacing 1.8V application processor GPIOs with 3.3V baseband modem I/Os in dual-SoC architectures. IC Role / Device Role / Timing Role: Bidirectional level shifter managing control/data lines (e.g., UART, I²C, GPIO) with sub-4 ns propagation delay. Use Value: Eliminates discrete resistor networks and reduces BOM count while maintaining signal integrity at 500 Mbps burst rates. | Use Scenario: Translating command/address signals between 1.2V DDR5 memory controller and 1.5V buffer ICs in high-density server DIMMs. IC Role / Device Role / Timing Role: Low-skew, rail-flexible transceiver ensuring setup/hold compliance across mixed-voltage memory channels. Use Value: Enables seamless integration of next-gen memory interfaces without custom ASIC-level level-shifting logic. |
| Notebook Platform Controller Hub (PCH)–EC Communication | Industrial IoT Sensor Hub Voltage Bridging |
Use Scenario: Connecting 3.3V embedded controller (EC) firmware debug lines to 1.8V PCH management engine in thin-and-light laptops. IC Role / Device Role / Timing Role: Asynchronous bidirectional translator with DIR-controlled flow direction and bus-hold on idle lines. Use Value: Guarantees reliable handshaking during boot/firmware update sequences, even with mismatched power-up timing. | Use Scenario: Bridging 2.5V industrial sensor outputs (e.g., analog front-end ADC interface) to 1.2V microcontroller I/Os in edge-node gateways. IC Role / Device Role / Timing Role: Robust, ESD-hardened (±8 kV HBM) level shifter operating across extended temperature (–40°C to 85°C). Use Value: Reduces system-level protection components and simplifies layout in thermally demanding enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TXS0102DCUR | Auto-direction sensing (no DIR pin); lower drive strength (6 mA vs. 12 mA); no bus-hold | Best for simple push-pull I²C/SPI where direction is inferred; unsuitable for GPIO/control lines requiring explicit DIR control | Select SN74AVCH2T45DCUR when deterministic direction control, bus-hold, or higher drive is required |
| SN74LVC2T45DCUR | No VCC isolation; Ioff not specified; max VCC = 3.6V but no 4.6V I/O tolerance; slower max speed (240 Mbps) | Suitable for cost-sensitive, single-rail-stable systems without hot-swap or mixed-power sequencing needs | Choose SN74AVCH2T45DCUR for robustness in dynamic power environments or 4.6V-tolerant interfacing |
Compared with TXS0102DCUR and SN74LVC2T45DCUR, the SN74AVCH2T45DCUR uniquely combines explicit DIR control, VCC isolation, 4.6V I/O tolerance, and active bus-hold - making it the only option qualified for high-reliability, multi-rail portable and industrial applications demanding guaranteed high-Z behavior during power transitions.
Availability
SN74AVCH2T45DCUR is available at Aetrix Electronics and suitable for smartphone, server, notebook, and industrial IoT applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for SN74AVCH2T45DCUR 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 personal electronics markets.
The SN74AVCH2T45 belongs to TI's AVC family of advanced voltage-translating transceivers, engineered specifically for low-voltage, high-speed bidirectional interfacing in battery-powered and thermally constrained portable platforms.
FAQ
What voltage ranges does the SN74AVCH2T45DCUR support on its A and B ports?
The SN74AVCH2T45DCUR supports independent supply voltages from 1.2V to 3.6V on both VCCA and VCCB. This enables translation between any combination of standard low-voltage nodes - including 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V - without external components. Each port's I/O thresholds and output drive strength scale directly with its associated supply rail, ensuring consistent logic behavior across configurations. The SN74AVCH2T45DCUR maintains full functionality across this range under –40°C to 85°C ambient conditions.
How does the DIR pin control data flow direction in the SN74AVCH2T45DCUR?
The DIR pin on the SN74AVCH2T45DCUR is referenced to VCCA and determines bidirectional data path activation: when DIR is low (≤ VCCA × 0.35), the B-port drivers are enabled and A-port drivers are high-impedance, allowing B→A data flow; when DIR is high (≥ VCCA × 0.65), the A-port drivers are enabled and B-port drivers are high-impedance, enabling A→B flow. No external OE signal is needed. The SN74AVCH2T45DCUR does not auto-sense direction - precise DIR control is required for deterministic operation in synchronous or asynchronous protocols.
Does the SN74AVCH2T45DCUR provide protection during partial power-down scenarios?
Yes. The SN74AVCH2T45DCUR includes fully specified Ioff circuitry that limits off-state current to ±5 µA maximum when either VCCA or VCCB is at 0 V, preventing damaging back-current into live rails. Additionally, its VCC isolation feature forces both A and B ports into high-impedance state if either supply drops to GND - eliminating false logic assertion during power sequencing or hot-swap events. These features are validated per JESD78 Class II latch-up testing and make the SN74AVCH2T45DCUR suitable for systems with staggered power domains.
What is the purpose of bus-hold circuitry in the SN74AVCH2T45DCUR, and how does it affect design?
The SN74AVCH2T45DCUR integrates active bus-hold on all four data I/Os (A1, A2, B1, B2), which maintains unused or un-driven pins at their last-valid logic state using internal feedback circuitry. This eliminates the need for external pull-up or pull-down resistors - reducing BOM cost, PCB area, and potential signal integrity issues. TI explicitly advises against adding external resistors with bus-hold enabled. The SN74AVCH2T45DCUR's bus-hold provides ≥25 µA sustaining current, ensuring robust noise immunity in high-impedance states without compromising speed or power.
Is the SN74AVCH2T45DCUR compatible with 4.6V-tolerant I/O interfaces?
Yes. All I/O pins (A1, A2, B1, B2) on the SN74AVCH2T45DCUR are rated for 4.6V absolute maximum input voltage - exceeding standard 3.3V logic levels. This tolerance allows direct connection to legacy or auxiliary 3.3V/5V peripherals without external voltage clamping diodes or level-shifting buffers. The 4.6V rating applies regardless of VCCA or VCCB supply voltage, and is validated under ESD stress (±8 kV HBM). This makes the SN74AVCH2T45DCUR particularly valuable in mixed-voltage systems where higher-voltage signals must be safely sampled by low-voltage controllers.
SN74AVCH2T45DCUR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AVCH
- Package/Case:
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Translator Type:
- Voltage Level
- Channel Type:
- Bidirectional
- Number of Circuits:
- 1
- Channels per Circuit:
- 2
- Voltage - VCCA:
- 1.2 V ~ 3.6 V
- Voltage - VCCB:
- 1.2 V ~ 3.6 V
- Input Signal:
- -
- Output Signal:
- -
- Output Type:
- Tri-State, Non-Inverted
- Data Rate:
- 500Mbps
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Features:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VFSOP (0.091", 2.30mm Width)
SN74AVCH2T45DCUR FAQ
1.How can I place an order for SN74AVCH2T45DCUR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AVCH2T45DCUR 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 SN74AVCH2T45DCUR reliable?
The price and inventory of SN74AVCH2T45DCUR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AVCH2T45DCUR is usually 5 days.
3.What payment methods are accepted for SN74AVCH2T45DCUR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AVCH2T45DCUR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AVCH2T45DCUR?
SN74AVCH2T45DCUR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AVCH2T45DCUR 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 SN74AVCH2T45DCUR?
For technical support, including SN74AVCH2T45DCUR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AVCH2T45DCUR requirements.
6.How does Aetrix verify that SN74AVCH2T45DCUR is sourced from the original manufacturer or authorized distributors?
All SN74AVCH2T45DCUR 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 SN74AVCH2T45DCUR meets industry standards.
7.What is the process for return or replacement of SN74AVCH2T45DCUR?
All SN74AVCH2T45DCUR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AVCH2T45DCUR, 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 SN74AVCH2T45DCUR part is unused and in its original packaging.
Return procedure for SN74AVCH2T45DCUR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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