Overview
The TXS0102DCUTG4, produced by Texas Instruments, is a 2-bit bidirectional voltage-level translator designed to bridge the digital-switching compatibility gap between two voltage nodes. This device is part of TI's 'Switch' type voltage translator family and is specifically engineered for translating logic voltage levels without the need for a direction-control signal. The TXS0102 can handle I/O voltages ranging from 1.65 V to 3.6 V on the A port and from 2.3 V to 5.5 V on the B port, making it versatile for various electronic systems.
The device employs an N-channel pass-gate transistor topology and output one-shot (O.S.) edge-rate accelerator circuitry to enhance data rates and signal integrity. It is particularly useful in applications involving open-drain drivers, such as I2C or 1-wire interfaces, and can also support push-pull CMOS logic outputs.
Key Specifications
| Parameter | Value | Unit | Notes |
|---|---|---|---|
| VCCA (A Port Voltage) | 1.65 to 3.6 | V | VCCA must be less than or equal to VCCB and not exceed 3.6 V |
| VCCB (B Port Voltage) | 2.3 to 5.5 | V | |
| Maximum Data Rate (Push-Pull) | 24 Mbps | ||
| Maximum Data Rate (Open-Drain) | 2 Mbps | ||
| Propagation Delay Time (tPLH) - Push-Pull | 2.5 to 5.3 ns | ns | |
| Propagation Delay Time (tPLH) - Open-Drain | 44 to 175 ns | ns | |
| Enable Time (ten) | 200 ns | ns | |
| Disable Time (tdis) | 50 to 40 ns | ns | |
| Input Capacitance (CI) | 2.5 to 3.5 pF | pF | |
| Input-to-Output Internal Capacitance (Cio) | 10 pF | pF | |
| Operating Temperature (TA) | -40 to 85 °C | °C | |
| Junction-to-Ambient Thermal Resistance (RθJA) | 105.8 to 239.3 °C/W | °C/W | Depending on package type |
Key Features
- No direction-control signal needed for data flow.
- Auto-direction-sensing based translator.
- Integrated 10-kΩ pullup resistors for open-drain applications.
- Supports both push-pull and open-drain driving modes.
- Output one-shot (O.S.) edge-rate accelerator circuitry to enhance signal integrity and data rates.
- Low propagation delay times.
- Enable and disable functionality via the OE input.
- Internal pullup resistors can be disabled by setting the OE pin low.
Applications
The TXS0102 is primarily used to interface devices or systems operating at different voltage levels. It is particularly suitable for:
- Open-drain driver applications such as I2C or 1-wire interfaces.
- Push-pull CMOS logic outputs, although the TXB0102 might be a better option for such applications.
- Point-to-point topology for bridging the digital-switching compatibility gap between two voltage nodes.
- Systems requiring bidirectional voltage translation without a control signal.
Q & A
- What is the voltage range for the A port of the TXS0102?
The A port can accept I/O voltages ranging from 1.65 V to 3.6 V.
- What is the voltage range for the B port of the TXS0102?
The B port can accept I/O voltages ranging from 2.3 V to 5.5 V.
- Does the TXS0102 require a direction-control signal?
No, the TXS0102 does not require a direction-control signal. It uses an auto-direction-sensing mechanism to determine the direction of data flow.
- What are the maximum data rates for push-pull and open-drain driving modes?
The maximum data rate for push-pull driving is 24 Mbps, and for open-drain driving, it is 2 Mbps.
- How do the integrated pullup resistors function in the TXS0102?
The TXS0102 has internal 10-kΩ pullup resistors on both A and B ports. These resistors are disabled when the OE pin is set low.
- What is the purpose of the output one-shot (O.S.) edge-rate accelerator circuitry?
The O.S. circuitry accelerates the rising edges of the input signals to improve the overall data rate and signal integrity by temporarily increasing the current drive capability of the driver.
- How do you enable or disable the TXS0102 device?
The device can be enabled by setting the OE input high and disabled by setting the OE input low, which places all I/Os in a high impedance state.
- What are the thermal considerations for the TXS0102?
The device has various thermal metrics such as junction-to-ambient thermal resistance (RθJA), junction-to-case thermal resistance (RθJC), and junction-to-board thermal resistance (RθJB), which should be considered for proper PCB layout and design.
- What is the recommended PCB layout practice for the TXS0102?
Texas Instruments recommends keeping PCB trace lengths short to avoid excessive capacitive loading and ensure proper O.S. triggering. The round trip delay of any reflection should be less than the one-shot duration.
- Can the TXS0102 be used in push-pull applications?
Yes, the TXS0102 can be used in push-pull applications, although the TXB0102 might be a better option for such scenarios.
