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Texas Instruments SN74AVCH2T45DCUT
- Part No.:
- SN74AVCH2T45DCUT
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74AVCH2T45DCUT.pdf
- Description:
- IC TRANSLTR BIDIRECTIONAL 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:570
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Product details
Overview
SN74AVCH2T45DCUT from Texas Instruments is a 2-bit, dual-supply bus transceiver enabling bidirectional voltage-level translation between independent 1.2V–3.6V domains (VCCA and VCCB), featuring 3-state outputs, active bus-hold on all data inputs, and Ioff partial power-down protection. It supports up to 500Mbps data rate (1.8V→3.3V) and is qualified for smartphone, server, and portable computing interconnects.
For engineers reviewing the SN74AVCH2T45DCUT datasheet, SN74AVCH2T45DCUT pinout, SN74AVCH2T45DCUT application, or SN74AVCH2T45DCUT equivalent, key selection criteria include configurable rail-to-rail level-shifting capability, 4.6V I/O tolerance, VCC isolation behavior, bus-hold functionality without external resistors, and NanoFree™ DCT (SSOP-8) package compatibility with high-density PCB layouts.
Technical Context
The SN74AVCH2T45DCUT implements a true 2-rail architecture: A-port logic levels track VCCA (1.2V–3.6V), B-port levels track VCCB (1.2V–3.6V), and DIR is referenced to VCCA. Direction control is asynchronous - low DIR enables B→A transmission; high DIR enables A→B transmission. No OE pin exists; output enable/disable is fully managed via DIR and power-state logic.
VCC isolation ensures both ports enter high-impedance when either VCCA or VCCB = GND. Ioff limits backflow current to ±5µA per port during partial power-down. Bus-hold circuitry sustains valid logic states on un-driven A1/A2/B1/B2 inputs without pull-up/down resistors, with sustaining currents specified from 15µA to 100µA depending on supply and threshold conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range (VCCA/VCCB) | 1.2V to 3.6V each - enables universal translation among 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V logic domains |
| Max Data Rate | 500Mbps (1.8V→3.3V) - supports high-speed inter-die or inter-SoC communication in mobile processors |
| I/O Voltage Tolerance | 4.6V - allows safe interfacing with legacy 3.3V or 5V systems without external clamping |
| Ioff Current | ±5µA max - prevents damaging back-current when one supply is powered down in hot-swap or power-gating scenarios |
| Bus-Hold Sustaining Current | 15–100µA (IBHL/IBHH) - maintains stable logic state on floating inputs without external biasing components |
| VCC Isolation | Active - forces both A and B ports into Hi-Z if either VCCA or VCCB = GND, eliminating false logic propagation |
| Propagation Delay (tPLH/tPHL) | 2.4–3.4ns typical (VCCA=3.3V, VCCB=3.3V) - ensures timing predictability in synchronous bus handshaking |
Pinout & Package
SN74AVCH2T45DCUT uses the DCT package: 8-pin SSOP (2.95mm × 4.00mm), lead pitch 0.65mm, RoHS-compliant, thermal resistance RθJA = 183.1°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VCCA | Power supply for A-side I/O | Bias source for A1/A2 outputs and DIR input; defines A-port logic thresholds |
| 2 A1 | Data I/O (A side) | Bidirectional signal path - drives or receives based on DIR state; level-shifted to VCCA |
| 3 A2 | Data I/O (A side) | Identical function to A1; supports 2-bit parallel translation |
| 4 GND | Reference ground | Common return for both supply rails; required for noise margin and ESD path integrity |
| 5 DIR | Direction control input | Referenced to VCCA; low = B→A data flow, high = A→B data flow; no internal pull-up/down |
| 6 B2 | Data I/O (B side) | Bidirectional signal path - drives or receives based on DIR state; level-shifted to VCCB |
| 7 B1 | Data I/O (B side) | Identical function to B2; completes 2-bit channel |
| 8 VCCB | Power supply for B-side I/O | Bias source for B1/B2 outputs; defines B-port logic thresholds and voltage translation target |
Key Features
| Feature | Design Value |
|---|---|
| Configurable dual-supply operation | Independent VCCA and VCCB rails (1.2V–3.6V) enable flexible voltage-domain bridging without external regulators |
| Active bus-hold circuitry | Eliminates need for external pull-up/down resistors on A1/A2/B1/B2, reducing BOM count and board space |
| VCC isolation | Prevents cross-rail contention by forcing Hi-Z on both ports if either supply collapses - critical for system-level fault containment |
| Partial power-down (Ioff) | Guarantees <±5µA off-state current, enabling safe power gating of one domain while the other remains active |
| NanoFree™ packaging | DCT package uses bare die as package body - achieves 2.95mm × 4.00mm footprint with improved thermal performance vs. standard SSOP |
Applications
| Smartphone Baseband–Application Processor Interface | Servers: CPU–Memory Buffer Interconnect |
|---|---|
Use Scenario: Level-shifting between 1.8V application processor GPIOs and 3.3V baseband modem interface. IC Role / Device Role / Timing Role: Bidirectional voltage translator managing control/status signals with sub-4ns propagation delay and bus-hold stability during sleep mode transitions. Use Value: Eliminates discrete resistor networks and enables seamless power-state coordination between heterogeneous SoCs without signal integrity loss. | Use Scenario: Isolating 1.2V DDR5 memory controller signals from 1.5V buffer ICs in high-density server DIMM modules. IC Role / Device Role / Timing Role: Dual-rail transceiver providing VCCB-referenced drive strength and VCCA-referenced input thresholds for clean setup/hold timing across voltage boundaries. Use Value: Ensures reliable signal integrity at >400MT/s while supporting independent power sequencing and hot-plug safety via Ioff and VCC isolation. |
| Desktop PC: PCIe Slot Auxiliary Power Sequencing | Notebook: USB-C Alternate Mode DisplayPort Lane Translation |
Use Scenario: Translating 3.3V PCIe WAKE# and CLKREQ# signals to 1.8V platform controller hub logic during low-power suspend/resume cycles. IC Role / Device Role / Timing Role: Asynchronous direction-controlled translator with guaranteed 2.4ns max tPLH/tPHL and VCC isolation to prevent wake-event corruption during partial power-down. Use Value: Enables deterministic wake latency and eliminates false triggers caused by supply-rail skew during deep-sleep entry/exit. | Use Scenario: Converting 1.2V DisplayPort AUX CH signals from GPU to 3.3V USB-C connector sideband use (SBU) pins in thin-and-light notebooks. IC Role / Device Role / Timing Role: Low-capacitance (Cio = 6pF), 4.6V-tolerant transceiver supporting DP 1.4 AUX channel timing with bus-hold holdover during cable insertion/removal events. Use Value: Maintains AUX channel link stability during hot-plug without external biasing, reducing component count and improving ESD robustness on exposed connectors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AVC2T245DCUR | Same 2-bit dual-supply architecture but uses VSSOP-8 (DCU) package (3.10mm × 2.00mm); identical electrical specs and pinout mapping | Preferred where board area is constrained and thermal resistance <247°C/W is acceptable | Select SN74AVC2T245DCUR only when footprint reduction outweighs thermal performance trade-off vs. DCT |
| TXB0102DCKR | Auto-direction sensing (no DIR pin); lower max data rate (100Mbps); 1.65V–3.6V VCCA/VCCB range; smaller DCK (SC70-8) package | Suitable for low-speed, space-constrained I²C/SPI bridges where direction is predictable and timing margins are generous | Choose TXB0102DCKR only for non-critical, low-bandwidth interfaces where DIR pin elimination simplifies routing |
Compared with SN74AVCH2T45DCUT, SN74AVC2T245DCUR offers identical functionality in a smaller footprint but higher thermal resistance, while TXB0102DCKR removes direction control complexity at the cost of speed and voltage flexibility - making SN74AVCH2T45DCUT optimal for high-speed, manually controlled, wide-voltage-range applications.
Availability
SN74AVCH2T45DCUT is available at Aetrix Electronics and suitable for smartphone baseband interfaces, server memory buffers, and notebook USB-C alternate mode implementations requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for SN74AVCH2T45DCUT 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 over 90 years of innovation in high-reliability electronic components.
The SN74AVCH2T45DCUT belongs to TI's AVC/AVCH logic family, engineered specifically for low-voltage, high-speed bidirectional level translation in portable and compute platforms where power efficiency, signal integrity, and board-space optimization are critical.
FAQ
What voltage ranges does the SN74AVCH2T45DCUT support on its A and B ports?
The SN74AVCH2T45DCUT supports independent supply voltages from 1.2V to 3.6V on both VCCA (A port) and VCCB (B port). This enables translation between any combination of 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V logic domains. The DIR input is referenced to VCCA, and all I/Os tolerate up to 4.6V regardless of supply setting - a key specification confirmed in Section 5.1 Absolute Maximum Ratings of the official datasheet.
How does the DIR pin control data direction in the SN74AVCH2T45DCUT?
In the SN74AVCH2T45DCUT, the DIR pin is a single control input referenced to VCCA. When DIR is driven low (≤VCCA × 0.35), the B-port outputs (B1, B2) are disabled and A-port outputs (A1, A2) become active - enabling data flow from B bus to A bus. When DIR is high (≥VCCA × 0.65), A-port outputs disable and B-port outputs activate - enabling A-to-B transmission. This behavior is defined in Table 7-1 (Function Table) and verified across all operating conditions in Section 5.3 Recommended Operating Conditions.
Does the SN74AVCH2T45DCUT require external pull-up or pull-down resistors on its data lines?
No, the SN74AVCH2T45DCUT does not require external pull-up or pull-down resistors on A1, A2, B1, or B2. It integrates active bus-hold circuitry that sustains valid logic states on un-driven inputs, with specified sustaining currents (IBHL/IBHH) ranging from 15µA to 100µA depending on supply and threshold conditions. TI explicitly advises against adding external resistors, as stated in the Description section and Section 7.3.5 - doing so may interfere with bus-hold operation and degrade noise immunity.
What is the maximum data rate supported by the SN74AVCH2T45DCUT, and under what conditions?
The SN74AVCH2T45DCUT supports a maximum data rate of 500Mbps when translating from 1.8V (VCCA) to 3.3V (VCCB), as specified in the Features list and validated in Section 5.6–5.10 switching characteristics. Other configurations yield lower rates: 320Mbps (<1.8V→3.3V or level-shifting to 2.5V/1.8V), 280Mbps (to 1.5V), and 240Mbps (to 1.2V). These values reflect guaranteed timing performance under recommended operating conditions, not theoretical limits.
How does VCC isolation function in the SN74AVCH2T45DCUT, and why is it important?
VCC isolation in the SN74AVCH2T45DCUT ensures that if either VCCA or VCCB is driven to GND (e.g., during power-down or fault), both A and B ports immediately enter a high-impedance state - preventing false logic levels from propagating across the interface. This behavior is electrically guaranteed per Section 7.3.1 and Table 4-1 pin functions, and is critical for system-level safety in hot-swap, power-gating, and multi-rail sequencing applications where supply collapse in one domain must not corrupt another.
SN74AVCH2T45DCUT 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)
SN74AVCH2T45DCUT FAQ
1.How can I place an order for SN74AVCH2T45DCUT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AVCH2T45DCUT 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 SN74AVCH2T45DCUT reliable?
The price and inventory of SN74AVCH2T45DCUT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AVCH2T45DCUT is usually 5 days.
3.What payment methods are accepted for SN74AVCH2T45DCUT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AVCH2T45DCUT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AVCH2T45DCUT?
SN74AVCH2T45DCUT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AVCH2T45DCUT 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 SN74AVCH2T45DCUT?
For technical support, including SN74AVCH2T45DCUT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AVCH2T45DCUT requirements.
6.How does Aetrix verify that SN74AVCH2T45DCUT is sourced from the original manufacturer or authorized distributors?
All SN74AVCH2T45DCUT 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 SN74AVCH2T45DCUT meets industry standards.
7.What is the process for return or replacement of SN74AVCH2T45DCUT?
All SN74AVCH2T45DCUT units undergo pre-shipment inspection (PSI). If there is an issue with SN74AVCH2T45DCUT, 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 SN74AVCH2T45DCUT part is unused and in its original packaging.
Return procedure for SN74AVCH2T45DCUT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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