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Texas Instruments TXS0102DCTTE4
- Part No.:
- TXS0102DCTTE4
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
TXS0102DCTTE4.pdf
- Description:
- IC TRANSLATOR BIDIRECTIONAL SM8
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
TXS0102DCTTE4 from Texas Instruments is a 2-bit bidirectional voltage-level translator IC designed for mixed-voltage digital interfacing between 1.65V–3.6V (A port) and 2.3V–5.5V (B port) domains, supporting both open-drain (2Mbps) and push-pull (24Mbps) signaling in I²C, SMBus, and GPIO applications.
For engineers reviewing the TXS0102DCTTE4 datasheet, TXS0102DCTTE4 pinout, TXS0102DCTTE4 application, or TXS0102DCTTE4 equivalent, key selection considerations include its auto-direction-sensing architecture, integrated 10kΩ pull-ups per I/O, VCC isolation, no power-supply sequencing requirement, and DCT (SSOP-8) package compatibility with industrial temperature range (–40°C to +85°C).
Technical Context
The TXS0102DCTTE4 implements a pass-gate topology with edge-rate accelerator (one-shot) circuitry on each channel to detect and speed up rising edges-reducing output impedance to ~50–70Ω during transition-enabling high-speed bidirectional translation without direction control. Its gate bias is set ~1 VT above the lower VCC rail to support automatic direction sensing.
It features dual independent supply rails (VCCA and VCCB), where VCCA ≤ VCCB must be maintained; internal 10kΩ pull-ups are present on all A- and B-port I/Os (disabled when OE = low); and the OE input (referenced to VCCA) controls full 3-state operation with 200ns enable/disable timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA Range | 1.65V to 3.6V - defines minimum logic-high threshold and power domain for A-side I/Os (e.g., 1.8V/2.5V/3.3V microcontrollers) |
| VCCB Range | 2.3V to 5.5V - supports legacy 5V peripherals, 3.3V FPGAs, or 2.5V ASICs on B side while maintaining VCCA ≤ VCCB |
| Max Data Rate | 24Mbps (push-pull), 2Mbps (open-drain) - enables high-speed I²C Fast Mode Plus (1Mbps) and UART up to 24Mbps with CMOS drivers |
| Propagation Delay | 1.3–7.5ns (tPHL/tPLH, depending on VCCA/VCCB and mode) - ensures sub-10ns latency critical for real-time GPIO synchronization |
| ESD Rating (B port) | ±8kV HBM - provides robust protection for B-side connections exposed to external interfaces or connectors |
| IOFF Current | ±2µA - enables true partial-power-down operation when either VCC rail is at GND, preventing backfeed and leakage in battery-backed systems |
| Output Skew (tSK) | 0.7ns - guarantees tight timing alignment between A1↔B1 and A2↔B2 channels for synchronous multi-bit transfers |
Pinout & Package
TXS0102DCTTE4 is packaged in an 8-pin SSOP (DCT) measuring 2.95mm × 4mm, with gull-wing leads and 0.65mm pitch. The package is RoHS-compliant and rated for industrial temperature operation (–40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | I/O referenced to VCCA | Bidirectional data channel 1, A-side - connects to 1.65–3.6V logic (e.g., MCU GPIO) |
| A2 | I/O referenced to VCCA | Bidirectional data channel 2, A-side - supports dual-line protocols like I²C SDA/SCL |
| B1 | I/O referenced to VCCB | Bidirectional data channel 1, B-side - interfaces to 2.3–5.5V peripherals (e.g., EEPROM, sensor) |
| B2 | I/O referenced to VCCB | Bidirectional data channel 2, B-side - maintains voltage-domain separation for noise immunity |
| GND | Ground reference | Common return path for both VCCA and VCCB supplies; must be low-impedance and star-connected |
| OE | Input (active-high, VCCA-referenced) | Global 3-state control - tie to GND via pulldown resistor for Hi-Z during power-up; 200ns enable/disable timing |
| VCCA | Power supply (A port) | Supplies A-side I/Os and OE logic; must be ≤ VCCB and ≥1.65V for valid operation |
| VCCB | Power supply (B port) | Supplies B-side I/Os and internal pull-ups; sets high-voltage logic threshold and ESD robustness |
Key Features
| Feature | Design Value |
|---|---|
| No direction-control signal required | Auto-direction sensing via pass-gate biasing eliminates need for external control lines or firmware coordination |
| Integrated 10kΩ pull-up resistors | Eliminates external components for open-drain I²C/SMBus, reducing BOM count and PCB area |
| VCC isolation | Both ports enter Hi-Z if either VCCA or VCCB is at GND - prevents backfeeding and enables safe hot-swap of voltage domains |
| No power-supply sequencing | Either VCCA or VCCB may ramp first - simplifies power management design in multi-rail systems |
| Edge-rate acceleration (one-shot) | Reduces rise time by temporarily lowering output impedance to ~50–70Ω during transitions - sustains 24Mbps push-pull performance |
Applications
| I²C Bus Level Translation | GPIO Voltage Bridging |
|---|---|
Use Scenario: Interfacing a 1.8V microcontroller I²C master to a 3.3V EEPROM slave in a compact embedded system. IC Role / Device Role: Bidirectional level shifter handling SDA and SCL lines with integrated pull-ups and auto-direction detection. Use Value: Eliminates external pull-up resistors and direction logic, reduces component count by 4 parts, and ensures <2Mbps compliance with I²C Fast Mode. | Use Scenario: Connecting 2.5V FPGA GPIOs to 5V industrial sensors requiring robust voltage translation and ESD protection. IC Role / Device Role: Dual-channel translator enabling isolated, noise-immune signal routing between mismatched logic families. Use Value: Provides ±8kV HBM ESD protection on B port, supports 5.5V tolerance, and maintains <10ns propagation skew across both channels. |
| UART Signal Translation | SMBus Peripheral Interface |
Use Scenario: Level-shifting UART TX/RX between a 3.3V SoC and legacy 5V modem in a communication gateway. IC Role / Device Role: Push-pull capable translator delivering 24Mbps throughput with sub-8ns tPHL/tPLH at 3.3V/5V. Use Value: Enables full-duplex UART at >12Mbps without timing margin loss, leveraging fast edge acceleration and low skew. | Use Scenario: Adding SMBus-compatible temperature sensors to a 1.65V ASIC-based server management controller. IC Role / Device Role: Open-drain translator with built-in 10kΩ pull-ups on both sides, compliant with SMBus 3.0 electrical specs. Use Value: Guarantees 2Mbps open-drain operation, supports VCCA as low as 1.65V, and meets SMBus VOL/VOLH thresholds under load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage-level translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TXS0102DCUR | VSSOP-8 (DCU) package, 2mm × 3.1mm - smaller footprint, same electrical specs and pinout as DCT | Preferred for space-constrained PCBs; thermal resistance RθJA = 229.6°C/W vs. DCT's 168.5°C/W | Select DCUR when board area is limited and thermal budget allows higher junction temp rise |
| TXB0102RGTR | Active-drive architecture (not passive pass-gate); supports 1.2V–3.6V on both sides; no integrated pull-ups; requires external direction control | Used where ultra-low VIL/VIH thresholds or 1.2V compatibility are needed; unsuitable for I²C without external logic | Choose TXB0102RGTR only when translating sub-1.65V logic or when direction control is available and preferred |
Compared with TXS0102DCUR, TXS0102DCTTE4 offers better thermal performance (lower RθJA) and mechanical stability in SSOP packaging, while TXB0102RGTR trades auto-direction capability for wider low-voltage support and active drive-but adds design complexity with required direction signals and external pull-ups.
Availability
TXS0102DCTTE4 is available at Aetrix Electronics and suitable for I²C bus expansion, industrial GPIO bridging, UART interface design, and SMBus peripheral integration requiring stable component supply across automotive, computing, and industrial OEM programs.
Supply support for TXS0102DCTTE4 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 interface solutions and power management ICs.
The TXS0102DCTTE4 belongs to TI's Switch-type voltage translator family, engineered specifically for seamless, directionless level shifting in mixed-voltage digital systems-targeting I²C, SMBus, GPIO, and UART applications where simplicity, reliability, and integration are critical.
FAQ
What is the maximum allowable voltage difference between VCCA and VCCB for reliable operation of the TXS0102DCTTE4?
The TXS0102DCTTE4 requires VCCA ≤ VCCB at all times, with VCCA ranging from 1.65V to 3.6V and VCCB from 2.3V to 5.5V. The absolute maximum differential is constrained by the 3.6V upper limit on VCCA and 2.3V lower limit on VCCB, allowing up to 3.2V difference (e.g., VCCA = 3.6V, VCCB = 5.5V). Exceeding VCCA > VCCB risks latch-up or undefined behavior per datasheet Section 5.3.
Does the TXS0102DCTTE4 support 1.2V logic on the A port?
No, the TXS0102DCTTE4 does not support 1.2V logic on the A port. Its specified VCCA operating range is strictly 1.65V to 3.6V per Section 5.3 of the datasheet. Attempting to operate below 1.65V may result in invalid VOL/VOH levels, unreliable auto-direction sensing, or failure to meet timing specifications. For 1.2V compatibility, consider TI's TXB0102RGTR instead.
Can the TXS0102DCTTE4 be used for SPI communication?
The TXS0102DCTTE4 is not recommended for standard SPI communication due to its open-drain/push-pull optimization and lack of dedicated direction control. While it can translate individual SPI lines (e.g., MOSI/MISO) in push-pull mode at up to 24Mbps, the auto-direction architecture introduces potential contention risk on shared bidirectional lines and lacks guaranteed timing alignment for full-duplex clocked protocols. Dedicated SPI translators like SN74AVC4T245 are more appropriate.
How does the OE pin function during power-up, and what is the recommended pull-down resistor value for TXS0102DCTTE4?
The OE pin on TXS0102DCTTE4 is active-high and referenced to VCCA. To ensure Hi-Z state during power-up, TI recommends tying OE to GND through a pulldown resistor. The minimum value depends on the current-sourcing capability of the driver controlling OE; typical values range from 10kΩ to 100kΩ. A 47kΩ resistor is commonly used to guarantee reliable disable while minimizing quiescent current draw.
Are the internal 10kΩ pull-up resistors on TXS0102DCTTE4 active when OE is low?
No, the internal 10kΩ pull-up resistors on both A and B ports of the TXS0102DCTTE4 are disabled when OE is low. Section 7.3.5 of the datasheet explicitly states: "The internal pull-ups of the TXS0102 are disabled when the OE pin is low." This ensures true high-impedance isolation and prevents unintended current paths during 3-state operation, which is essential for bus sharing and power-down safety.
TXS0102DCTTE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Translator Type:
- Voltage Level
- Channel Type:
- Bidirectional
- Number of Circuits:
- 1
- Channels per Circuit:
- 2
- Voltage - VCCA:
- 1.65 V ~ 3.6 V
- Voltage - VCCB:
- 2.3 V ~ 5.5 V
- Input Signal:
- -
- Output Signal:
- -
- Output Type:
- Open Drain, Push-Pull
- Data Rate:
- 24Mbps
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Features:
- Auto-Direction Sensing
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-LSSOP, 8-MSOP (0.110", 2.80mm Width)
TXS0102DCTTE4 FAQ
1.How can I place an order for TXS0102DCTTE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TXS0102DCTTE4 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 TXS0102DCTTE4 reliable?
The price and inventory of TXS0102DCTTE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TXS0102DCTTE4 is usually 5 days.
3.What payment methods are accepted for TXS0102DCTTE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TXS0102DCTTE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TXS0102DCTTE4?
TXS0102DCTTE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TXS0102DCTTE4 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 TXS0102DCTTE4?
For technical support, including TXS0102DCTTE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TXS0102DCTTE4 requirements.
6.How does Aetrix verify that TXS0102DCTTE4 is sourced from the original manufacturer or authorized distributors?
All TXS0102DCTTE4 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 TXS0102DCTTE4 meets industry standards.
7.What is the process for return or replacement of TXS0102DCTTE4?
All TXS0102DCTTE4 units undergo pre-shipment inspection (PSI). If there is an issue with TXS0102DCTTE4, 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 TXS0102DCTTE4 part is unused and in its original packaging.
Return procedure for TXS0102DCTTE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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