Overview
The TXB0108DQSR is an 8-bit bidirectional voltage-level translator produced by Texas Instruments. This device is specifically designed to translate logic voltage levels between two different voltage domains, making it ideal for interfacing devices or systems operating at different interface voltages. The TXB0108DQSR features auto-direction sensing, eliminating the need for a direction-control signal to manage data flow between the A and B ports. It supports a wide range of voltage levels, from 1.2 V to 3.6 V on the A port and from 1.65 V to 5.5 V on the B port, with VCCA ≤ VCCB.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Manufacturer | Texas Instruments | - |
| Package Type | USON-20 (DQS) | - |
| VCCA Range | A-port supply voltage | 1.2 V to 3.6 V |
| VCCB Range | B-port supply voltage | 1.65 V to 5.5 V |
| ESD Protection | Human-Body Model | ±15-kV (A Port), ±8-kV (B Port for YZP Package) |
| Continuous Output Current | Per I/O pin | ±50 mA |
| Continuous Current through VCCA, VCCB, or GND | - | ±100 mA |
| Storage Temperature Range | - | –65°C to 150°C |
| Data Rate | - | Up to 100 Mbps |
| Output Impedance | During output transition | 70 Ω (VCCO = 1.2 V to 1.8 V), 50 Ω (VCCO = 1.8 V to 3.3 V), 40 Ω (VCCO = 3.3 V to 5 V) |
Key Features
- Auto-Direction Sensing: No direction-control signal is required to manage data flow between the A and B ports.
- Voltage-Level Translation: Supports translation between voltage levels from 1.2 V to 3.6 V on the A port and from 1.65 V to 5.5 V on the B port.
- ESD Protection: Offers ±15-kV ESD protection on the A port and ±8-kV ESD protection on the B port for YZP packages.
- Low Power Consumption: Maximum ICC of 4 μA.
- Ioff Support: Supports partial-power-down mode operation.
- Latch-Up Performance: Exceeds 100 mA per JESD 78, Class II.
- Edge-Rate Accelerators: One-shot circuitry speeds up low-to-high and high-to-low transitions.
- OE Input Circuit: Referenced to VCCA, allowing for device disable and high-impedance state on all I/Os.
Applications
- Handsets and Smartphones: Ideal for voltage-level translation in mobile devices.
- Tablets and Desktop PCs: Used in various computing devices to interface different voltage domains.
- General Level-Translation Applications: Suitable for any system requiring bidirectional voltage-level translation between different interface voltages.
Q & A
- What is the primary function of the TXB0108DQSR?
The TXB0108DQSR is an 8-bit bidirectional voltage-level translator designed to translate logic voltage levels between two different voltage domains.
- What are the voltage ranges supported by the A and B ports?
The A port supports voltages from 1.2 V to 3.6 V, and the B port supports voltages from 1.65 V to 5.5 V.
- Does the TXB0108DQSR require a direction-control signal?
No, the TXB0108DQSR features auto-direction sensing and does not require a direction-control signal to manage data flow.
- What is the maximum data rate supported by the TXB0108DQSR?
The device supports data rates up to 100 Mbps.
- What kind of ESD protection does the TXB0108DQSR offer?
The device offers ±15-kV ESD protection on the A port and ±8-kV ESD protection on the B port for YZP packages.
- How does the one-shot circuitry in the TXB0108DQSR work?
The one-shot circuitry speeds up low-to-high and high-to-low transitions by turning on PMOS and NMOS transistors for short durations during rising and falling edges, respectively.
- What is the typical output impedance of the TXB0108DQSR during output transitions?
The typical output impedance is 70 Ω at VCCO = 1.2 V to 1.8 V, 50 Ω at VCCO = 1.8 V to 3.3 V, and 40 Ω at VCCO = 3.3 V to 5 V.
- Can the TXB0108DQSR be used in partial-power-down mode?
Yes, the device supports partial-power-down mode operation through its Ioff feature.
- How does the OE input circuit work in the TXB0108DQSR?
The OE input circuit, referenced to VCCA, allows the device to be disabled, placing all I/Os in a high-impedance state when OE is set low.
- What are some common applications of the TXB0108DQSR?
The device is commonly used in handsets, smartphones, tablets, and desktop PCs for voltage-level translation.
