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Texas Instruments TXB0108YS
- Part No.:
- TXB0108YS
- Manufacturer:
- Texas Instruments
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
TXB0108YS.pdf
- Description:
- WAFER SALES
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Product details
Overview
TXB0108YS from Texas Instruments is an 8-bit bidirectional voltage-level translator with auto-direction sensing, supporting 1.2V–3.6V on the A port and 1.65V–5.5V on the B port (VCCA ≤ VCCB), ±15kV HBM ESD protection on the B port, 4μA max ICC, and Ioff partial-power-down capability. It enables seamless logic-level translation between mixed-voltage subsystems in mobile processors and peripherals.
For engineers reviewing the TXB0108YS datasheet, TXB0108YS pinout, TXB0108YS application, or TXB0108YS equivalent, this device is selected for low-power, high-speed bidirectional translation where automatic direction detection eliminates external control lines, and VCC isolation ensures safe operation during power sequencing in battery-powered handheld devices.
Technical Context
The TXB0108YS implements a buffered architecture with edge-rate accelerators (one-shots) to enhance data rate without requiring direction-control signals. Its auto-sensing logic detects signal transitions on either port to dynamically enable the corresponding output driver, enabling true bidirectional operation across asymmetric supply rails.
VCCA-referenced OE input and VCC isolation ensure that if either VCCA or VCCB is at GND, all outputs enter high-impedance state - critical for hot-plug and partial-power-down scenarios. Ioff circuitry prevents damaging current backflow when either supply is powered down, meeting JESD78 Class II latch-up requirements (>100mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| A-port voltage range | 1.2V to 3.6V - supports 1.2V/1.5V/1.8V/2.5V/3.3V logic domains; must be ≤ VCCB. |
| B-port voltage range | 1.65V to 5.5V - interfaces directly with 1.8V/2.5V/3.3V/5V systems including legacy peripherals. |
| Max data rate | 100 Mbps at VCCA = 3.3V / VCCB = 3.3V - enables high-speed I²C, SPI, and GPIO translation in mobile SoC interconnects. |
| B-port ESD rating | ±15kV HBM - provides robust system-level ESD immunity for exposed B-side I/O in handheld applications. |
| Quiescent current | 4 μA max ICC - minimizes standby power in always-on mobile subsystems such as sensor hubs or PMIC interfaces. |
| Propagation delay | 0.9 ns (min) to 4.9 ns (max) - ensures timing-critical signal integrity across voltage domains with sub-5ns skew. |
| Channel-to-channel skew | 0.3 ns max - maintains signal alignment across all 8 channels for parallel bus translation (e.g., SDIO, eMMC). |
Pinout & Package
TXB0108YS is packaged in a 20-pin DSGBA (YZP) package with nominal body size 1.90 mm × 2.40 mm and 0.4 mm pitch. The package features a compact, near-chip-scale footprint optimized for space-constrained mobile PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1–A8 | A-port bidirectional I/O | Reference to VCCA; translate signals from 1.2V–3.6V domain to B port. |
| B1–B8 | B-port bidirectional I/O | Reference to VCCB; translate signals from 1.65V–5.5V domain to A port; ±15kV HBM rated. |
| VCCA | A-port supply | Power rail for A-side logic; OE input referenced to this supply; must be ≤ VCCB. |
| VCCB | B-port supply | Power rail for B-side logic; enables translation up to 5.5V; supplies internal level-shifted drivers. |
| OE | Output enable | Active-low, VCCA-referenced control; drives all I/O into high-Z when low - used for power sequencing or bus isolation. |
| GND | Ground reference | Common return path for both ports; required for proper ESD current discharge and bias stability. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-direction sensing | Eliminates need for external direction-control signals - reduces PCB routing complexity and firmware overhead in bidirectional buses. |
| VCC isolation | Guarantees high-impedance outputs when either VCCA or VCCB is at GND - prevents backfeeding and enables safe power sequencing in multi-rail systems. |
| Ioff partial-power-down | Disables outputs and blocks current flow when either supply is off - protects downstream components and meets JEDEC JESD78 latch-up requirements. |
| ±15kV B-port HBM ESD | Enables direct connection to exposed connectors or external peripherals without additional ESD protection components - saves board area and BOM cost. |
| Low 4μA quiescent current | Reduces system standby power in always-on mobile functions like touch controllers or ambient light sensors interfacing to application processors. |
Applications
| Mobile Processor Interface | USB OTG Peripheral Bridge |
|---|---|
Use Scenario: Interfacing a 1.8V application processor GPIO bank to a 3.3V camera module interface. IC Role / Device Role / Timing Role: Bidirectional level translator enabling real-time control and status feedback without direction-control lines. Use Value: Eliminates need for discrete MOSFET translators or direction logic, reducing component count and layout area by >40%. |
Use Scenario: Connecting a 1.2V USB PHY controller to a 5V USB OTG accessory detection circuit. IC Role / Device Role / Timing Role: Voltage translator with auto-sensing for ID pin and VBUS monitoring signals. Use Value: Supports hot-plug detection with <10ns propagation delay and ±15kV ESD tolerance on the 5V side. |
| eMMC/SDIO Bus Translation | PMIC-to-SoC Communication |
Use Scenario: Translating 1.8V eMMC command/data lines to a 3.3V host controller in tablet designs. IC Role / Device Role / Timing Role: 8-bit parallel translator maintaining signal integrity at up to 100 Mbps with <0.3ns channel skew. Use Value: Enables full-speed eMMC 5.1 operation without timing margin loss due to voltage mismatch. |
Use Scenario: Level-shifting PMIC register access signals (1.2V I²C) to a 3.3V SoC power management unit. IC Role / Device Role / Timing Role: Low-power, I²C-compatible bidirectional translator with Ioff for safe power-state transitions. Use Value: Prevents leakage current during PMIC sleep modes, extending battery life in always-on system states. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage-level translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TXS0108E | Open-drain architecture with stronger pull-up drivers; no VCC isolation; lower max data rate (60 Mbps). | Designed for I²C/SMBus open-drain buses; not suitable for push-pull GPIO or high-speed parallel interfaces. | Select TXS0108E only when translating open-drain protocols; TXB0108YS remains preferred for push-pull, high-speed, or isolated-rail use cases. |
| SN74AVC8T245 | Direction-controlled (DIR pin required); no auto-sensing; higher ICC (24μA); no VCC isolation or Ioff. | Requires external direction logic and careful power sequencing; lacks ESD robustness (±8kV HBM). | Choose SN74AVC8T245 only when direction is static and layout allows DIR routing; TXB0108YS offers superior integration for dynamic bidirectional links. |
Compared with TXS0108E and SN74AVC8T245, TXB0108YS uniquely combines auto-direction sensing, VCC isolation, Ioff, and ±15kV B-port ESD - making it the only option among the three qualified for high-reliability, mixed-rail, hot-plug-capable mobile interfaces without added support components.
Availability
TXB0108YS is available at Aetrix Electronics and suitable for smartphone, tablet, and handheld medical device designs requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for TXB0108YS 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 solutions, with decades of expertise in interface IC design and automotive-grade reliability.
The TXB0108YS belongs to TI's TXB-series voltage translators, engineered specifically for low-power, high-speed bidirectional logic-level translation in space- and power-constrained portable electronics.
FAQ
What is the maximum supported data rate for TXB0108YS?
The TXB0108YS supports up to 100 Mbps when operating at VCCA = 3.3V and VCCB = 3.3V, as verified in TI's SCES643L datasheet Section 5.11. At lower voltages - such as VCCA = 1.8V / VCCB = 2.5V - the max data rate is 60 Mbps. These values are measured under recommended operating conditions with defined load and transition rates.
Does TXB0108YS require external pull-up resistors on either port?
No, TXB0108YS does not require external pull-up resistors for basic push-pull operation. Its internal edge-rate accelerators and buffered architecture drive signals actively in both directions. Pull-ups may be needed only for specific open-drain emulation or weak-signal conditioning - and if used, must exceed 50 kΩ per TI's guidance in Section 4.
Can TXB0108YS translate between 1.2V and 5V logic levels?
Yes, TXB0108YS supports translation from 1.2V (A port) to 5V (B port), provided VCCA ≤ VCCB and both supplies remain within their rated ranges: VCCA = 1.2V–3.6V and VCCB = 1.65V–5.5V. This configuration is explicitly validated in TI's timing tables (e.g., Section 5.10) and electrical characteristics (Section 5.5).
How does the OE pin function on TXB0108YS?
The OE pin on TXB0108YS is an active-low, VCCA-referenced enable input. When OE is driven low, all A- and B-port I/Os enter high-impedance state - isolating both sides electrically. When OE is high, bidirectional auto-sensing translation operates normally. TI recommends tying OE to GND via a pulldown resistor during power-up to ensure safe default state.
Is TXB0108YS compatible with I²C bus signals?
TXB0108YS is not recommended for standard I²C translation because it is designed for push-pull CMOS logic, not open-drain signaling. For I²C, TI specifies the TXS0108E as the compatible alternative. Using TXB0108YS on I²C may cause bus contention or fail pull-up behavior due to its active-drive architecture.
TXB0108YS 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:
- -
TXB0108YS FAQ
1.How can I place an order for TXB0108YS through Aetrix?
Please submit a Request for Quotation (RFQ) for TXB0108YS 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 TXB0108YS reliable?
The price and inventory of TXB0108YS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TXB0108YS is usually 5 days.
3.What payment methods are accepted for TXB0108YS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TXB0108YS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TXB0108YS?
TXB0108YS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TXB0108YS 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 TXB0108YS?
For technical support, including TXB0108YS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TXB0108YS requirements.
6.How does Aetrix verify that TXB0108YS is sourced from the original manufacturer or authorized distributors?
All TXB0108YS 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 TXB0108YS meets industry standards.
7.What is the process for return or replacement of TXB0108YS?
All TXB0108YS units undergo pre-shipment inspection (PSI). If there is an issue with TXB0108YS, 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 TXB0108YS part is unused and in its original packaging.
Return procedure for TXB0108YS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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