Overview
The SN74AVCH2T45YZPR, produced by Texas Instruments, is a 2-bit, 2-supply, bus transceiver designed for universal low-voltage bidirectional translation and level-shifting. This device is optimized for asynchronous communication between two data buses, allowing data transmission from the A bus to the B bus or vice versa based on the logic levels of the direction-control (DIR) input. It supports a wide range of supply voltages from 1.2V to 3.6V for both the A and B ports, making it versatile for various voltage nodes such as 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V.
The device features active bus-hold circuitry, which holds unused or un-driven inputs at a valid logic state, and is fully specified for partial-power-down applications using Ioff circuitry to prevent damaging current backflow. The VCC isolation feature ensures that both ports are in a high-impedance state if either VCC input is at GND.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Operating Free-Air Temperature (TA) | -40 | 85 | °C | |
| Supply Voltage (VCCA, VCCB) | 1.2 | 3.6 | V | |
| Propagation Delay (tPLH, tPHL) @ VCCA = 1.2V | 2.9 | 3.1 | 3.4 | ns |
| Propagation Delay (tPLH, tPHL) @ VCCA = 1.5V | 2.8 | 3.1 | 5.4 | ns |
| Propagation Delay (tPLH, tPHL) @ VCCA = 1.8V | 2.7 | 3.1 | 4.6 | ns |
| Propagation Delay (tPLH, tPHL) @ VCCA = 2.5V | 2.5 | 3.0 | 3.7 | ns |
| Propagation Delay (tPLH, tPHL) @ VCCA = 3.3V | 2.3 | 2.9 | 3.5 | ns |
| Junction-to-Ambient Thermal Resistance (RθJA) | 105.8 | °C/W (DSBGA package) | ||
| Package Size (DSBGA) | 1.89mm × 0.89mm |
Key Features
- Universal Low-Voltage Bidirectional Translation: Supports translation between any of the 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V voltage nodes.
- Active Bus-Hold Circuitry: Holds unused or un-driven inputs at a valid logic state.
- Partial-Power-Down Capability: Ioff circuitry disables outputs to prevent damaging current backflow when powered down.
- VCC Isolation Feature: Ensures both ports are in a high-impedance state if either VCC input is at GND.
- Configurable Power-Supply Rails: A port tracks VCCA, and B port tracks VCCB, each accepting supply voltages from 1.2V to 3.6V.
- Asynchronous Communication: Designed for data transmission between two data buses based on the DIR pin logic levels.
- Compact Packaging: Available in DCT (SSOP), DCU (VSSOP), and YZP (DSBGA) packages.
Applications
- Low-Voltage Systems: Ideal for systems requiring translation between different voltage levels.
- Mobile Devices: Suitable for mobile devices due to its low power consumption and compact packaging.
- Embedded Systems: Used in embedded systems that require asynchronous communication between different voltage domains.
- Industrial Automation: Can be used in industrial automation systems where multiple voltage levels are present.
- Consumer Electronics: Applicable in consumer electronics that require level-shifting and bidirectional data transmission.
Q & A
- What is the primary function of the SN74AVCH2T45?
The primary function is to provide universal low-voltage bidirectional translation and level-shifting between two data buses.
- What are the supported supply voltage ranges for the A and B ports?
Both the A and B ports support supply voltages from 1.2V to 3.6V.
- What is the purpose of the active bus-hold circuitry?
The active bus-hold circuitry holds unused or un-driven inputs at a valid logic state.
- How does the VCC isolation feature work?
If either VCC input is at GND, the VCC isolation feature ensures that both ports are in a high-impedance state.
- What is the role of the DIR pin in the SN74AVCH2T45?
The DIR pin controls the direction of data transmission between the A and B buses.
- Is the SN74AVCH2T45 suitable for partial-power-down applications?
Yes, it is fully specified for partial-power-down applications using Ioff circuitry.
- What are the available package options for the SN74AVCH2T45?
The device is available in DCT (SSOP), DCU (VSSOP), and YZP (DSBGA) packages.
- What is the junction-to-ambient thermal resistance for the DSBGA package?
The junction-to-ambient thermal resistance for the DSBGA package is 105.8°C/W.
- Can the SN74AVCH2T45 be used in industrial automation systems?
Yes, it can be used in industrial automation systems where multiple voltage levels are present.
- Is the SN74AVCH2T45 suitable for mobile devices?
Yes, it is suitable due to its low power consumption and compact packaging.
