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Texas Instruments SN74AVCH2T45DCTT
- Part No.:
- SN74AVCH2T45DCTT
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
SN74AVCH2T45DCTT.pdf
- Description:
- IC TRANSLATOR BIDIRECTIONAL SM8
- 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 3-state outputs, active bus-hold on all data inputs, and VCC isolation for robust partial-power-down operation. It serves as a configurable interface IC in low-voltage system interconnects.
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), 4.6V I/O tolerance, maximum 500Mbps data rate (1.8V→3.3V), Ioff-enabled power-down safety, and NanoFree™ DCT package footprint.
Technical Context
The SN74AVCH2T45 implements asynchronous bidirectional data flow controlled solely by the DIR input referenced to VCCA - logic low enables B→A transmission, high enables A→B. Its dual-rail architecture decouples A-port (VCCA-referenced) and B-port (VCCB-referenced) logic thresholds, enabling translation across mismatched voltage nodes without external biasing.
Active bus-hold circuitry maintains valid logic states on un-driven A1/A2/B1/B2 inputs without pull resistors, while VCC isolation forces both ports into high-impedance when either VCCA or VCCB = GND. The Ioff specification (±1μA max at 0V supply) prevents back-current during partial power-down, satisfying JEDEC JESD78 Class II latch-up (>100mA) and HBM ESD (±8kV) requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range (VCCA / VCCB) | 1.2V to 3.6V each - enables universal level-shifting among 1.2V/1.5V/1.8V/2.5V/3.3V rails |
| I/O Voltage Tolerance | 4.6V - allows safe interfacing with higher-voltage legacy signals without clamping diodes |
| Max Data Rate | 500Mbps (1.8V→3.3V) - supports high-speed inter-die or inter-SoC communication in portable devices |
| Propagation Delay (tPLH/tPHL) | 2.4ns typical (VCCA=3.3V, VCCB=3.3V) - ensures timing-critical signal integrity in synchronous buses |
| Ioff Current | ±1μA max (–40°C to 85°C) - guarantees safe hot-insertion and rail sequencing in multi-supply systems |
| Bus-Hold Input Current | ±25μA min sustaining current - eliminates need for external pull resistors, reducing BOM count and board space |
| ESD Rating (HBM) | ±8000V - meets industrial handling and end-equipment surge immunity requirements |
Pinout & Package
SN74AVCH2T45DCTT uses the DCT (SSOP-8) package: 2.95mm × 4.00mm body, 0.65mm pitch, surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA (Pin 1) | A-port supply rail | Powers A1/A2 I/Os and DIR input; sets A-port logic thresholds and output swing |
| A1 (Pin 2) | Data I/O (A-side) | Bidirectional port with bus-hold; direction determined by DIR; output level follows VCCA |
| A2 (Pin 3) | Data I/O (A-side) | Identical function to A1; independent channel for 2-bit bus translation |
| GND (Pin 4) | Reference ground | Common return path for both supplies; required for noise margin and ESD discharge |
| DIR (Pin 5) | Direction control | Referenced to VCCA; low = B→A data flow, high = A→B data flow; no OE pin required |
| B1 (Pin 7) | Data I/O (B-side) | Bidirectional port with bus-hold; output level follows VCCB; threshold set by VCCB |
| B2 (Pin 6) | Data I/O (B-side) | Identical function to B1; second channel for full 2-bit bidirectional translation |
| VCCB (Pin 8) | B-port supply rail | Powers B1/B2 I/Os; sets B-port logic thresholds and output swing independently of VCCA |
Key Features
| Feature | Design Value |
|---|---|
| Configurable dual-supply operation | VCCA and VCCB independently set from 1.2V to 3.6V - eliminates need for external level-shifters in mixed-voltage SoC interfaces |
| VCC isolation | Both A/B ports enter high-Z if either VCCA or VCCB = GND - prevents false logic assertion during power sequencing or fault conditions |
| Active bus-hold on all data pins | Maintains valid logic state on floating A1/A2/B1/B2 without external resistors - reduces component count and layout complexity |
| Partial power-down support (Ioff) | Outputs disabled with <±1μA leakage when either supply is off - enables safe hot-swap and dynamic rail gating |
| NanoFree™ packaging | DCT package uses silicon die as package - 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: Translating 1.2V DDR4 memory controller signals to 1.8V application processor I/Os in compact mobile SoC designs. IC Role / Device Role / Timing Role: Bidirectional level-shifter managing command/address/data flow between voltage-isolated subsystems with precise timing alignment. Use Value: Enables direct integration without discrete FET translators; 2.4ns propagation delay preserves setup/hold margins at 500Mbps. | Use Scenario: Isolating 1.5V DDR4 DIMM signals from 3.3V server management controller I²C/SMBus lines during runtime power cycling. IC Role / Device Role / Timing Role: Asynchronous voltage translator with VCC isolation ensuring bus integrity when memory rails are powered down. Use Value: Prevents bus contention and false ACKs via guaranteed high-Z on both sides during partial power-down (Ioff <1μA). |
| Desktop PC: GPU–PCIe Switch Interface | Notebook: USB-C Controller–Type-C Port Multiplexer |
Use Scenario: Level-shifting 1.8V PCIe Gen3 reference clock and sideband signals between GPU and 3.3V PCIe switch in high-density graphics cards. IC Role / Device Role / Timing Role: Low-skew, low-capacitance buffer translating timing-critical control signals across voltage domains. Use Value: 6pF typical I/O capacitance minimizes signal reflection; 4.6V I/O tolerance accommodates overshoot on fast-switching PCIe lanes. | Use Scenario: Bidirectionally translating 1.2V USB-C controller GPIOs to 3.3V Type-C port multiplexer control lines in ultra-thin notebooks. IC Role / Device Role / Timing Role: Direction-controlled bus transceiver managing configuration handshaking and status reporting between mixed-voltage peripherals. Use Value: Bus-hold eliminates need for pull-ups on shared GPIO lines, reducing standby current and PCB routing congestion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AVC2T45DCTR | Same core functionality; VSSOP-8 (DCU) package (3.10mm × 2.00mm), slightly larger width but lower profile than DCT | Preferred where board height is constrained but lateral space permits wider footprint | Select for tighter Z-height requirements; identical electrical specs and pinout mapping |
| TXS0102DCTT | Auto-direction sensing (no DIR pin); lower drive strength (±8mA vs ±12mA); no bus-hold; supports 1.2V–3.6V rails | Suitable for simple push-pull data lines without control signaling; not appropriate for DIR-gated protocols like I²C | Choose only when direction is inherently unidirectional or auto-sensed; avoid where bus-hold or precise DIR control is needed |
Compared with SN74AVCH2T45DCTT, SN74AVC2T45DCTR offers identical performance in a different SSOP variant, while TXS0102DCTT trades DIR control and bus-hold for automatic direction detection - making it unsuitable for protocols requiring explicit direction arbitration or floating-input resilience.
Availability
SN74AVCH2T45DCTT is available at Aetrix Electronics and suitable for smartphone baseband interfaces, server memory buffers, and notebook USB-C controller interconnects requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for SN74AVCH2T45DCTT 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 company specializing in analog and embedded processing technologies, with leadership in interface, power management, and signal chain solutions.
The SN74AVCH2T45 belongs to TI's AVC/AVCH family of advanced voltage-translating transceivers, designed specifically for low-voltage, high-speed bidirectional interconnect in portable and computing systems where supply rail diversity and power sequencing resilience are critical.
FAQ
What voltage ranges can SN74AVCH2T45DCTT translate between?
SN74AVCH2T45DCTT supports independent VCCA and VCCB supplies from 1.2V to 3.6V, enabling translation between any pair within that range - including 1.2V↔1.5V, 1.8V↔2.5V, 1.8V↔3.3V, and 2.5V↔3.3V. Both supplies must be within spec simultaneously; the device does not support operation with either supply below 1.2V or above 3.6V.
How does the DIR pin control data direction in SN74AVCH2T45DCTT?
In SN74AVCH2T45DCTT, the DIR pin is referenced to VCCA. When DIR = low (≤0.35×VCCA), data flows from B-port to A-port; when DIR = high (≥0.65×VCCA), data flows from A-port to B-port. There is no output-enable (OE) pin - direction control is the sole mechanism for enabling/disabling data paths.
Does SN74AVCH2T45DCTT require external pull-up or pull-down resistors on its I/O pins?
No. SN74AVCH2T45DCTT integrates active bus-hold circuitry on all data I/Os (A1, A2, B1, B2), which maintains valid logic states on un-driven or floating inputs. Texas Instruments explicitly advises against using external pull resistors with this feature, as they interfere with bus-hold operation and increase power consumption.
What is the maximum data rate supported by SN74AVCH2T45DCTT, and under what conditions?
SN74AVCH2T45DCTT achieves up to 500Mbps when translating from 1.8V to 3.3V (VCCA=1.8V, VCCB=3.3V). Rates drop with other combinations: 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 AC performance under recommended operating conditions.
How does SN74AVCH2T45DCTT behave during partial power-down, and what protection does it offer?
SN74AVCH2T45DCTT features Ioff circuitry that limits current to ±1μA max when either VCCA or VCCB is at 0V, preventing damaging back-current flow. Its VCC isolation function forces both A and B ports into high-impedance when either supply is grounded - eliminating bus contention and false logic during power sequencing or fault events.
SN74AVCH2T45DCTT 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-LSSOP, 8-MSOP (0.110", 2.80mm Width)
SN74AVCH2T45DCTT FAQ
1.How can I place an order for SN74AVCH2T45DCTT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AVCH2T45DCTT 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 SN74AVCH2T45DCTT reliable?
The price and inventory of SN74AVCH2T45DCTT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AVCH2T45DCTT is usually 5 days.
3.What payment methods are accepted for SN74AVCH2T45DCTT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AVCH2T45DCTT transactions.
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4.How is shipping managed for SN74AVCH2T45DCTT?
SN74AVCH2T45DCTT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AVCH2T45DCTT 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 SN74AVCH2T45DCTT?
For technical support, including SN74AVCH2T45DCTT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AVCH2T45DCTT requirements.
6.How does Aetrix verify that SN74AVCH2T45DCTT is sourced from the original manufacturer or authorized distributors?
All SN74AVCH2T45DCTT 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 SN74AVCH2T45DCTT meets industry standards.
7.What is the process for return or replacement of SN74AVCH2T45DCTT?
All SN74AVCH2T45DCTT units undergo pre-shipment inspection (PSI). If there is an issue with SN74AVCH2T45DCTT, 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 SN74AVCH2T45DCTT part is unused and in its original packaging.
Return procedure for SN74AVCH2T45DCTT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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