Overview
The SN74AVCH2T45DCUT, produced by Texas Instruments, is a 2-bit, 2-supply, bus transceiver designed for asynchronous communication between two data buses. This device supports universal low-voltage bidirectional translation and level-shifting between various voltage nodes ranging from 1.2V to 3.6V. It features active bus-hold circuitry, which maintains 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.
Key Specifications
| Parameter | Description | Min | Max | Unit | |
|---|---|---|---|---|---|
| VCCA/VCCB Supply Voltage | Supply voltage range | 1.2 | - | 3.6 | V |
| Operating Free-Air Temperature | Operating temperature range | -40 | - | 85 | °C |
| tPLH/tPHL Propagation Delay | Low-to-high/high-to-low propagation delay | 2.9 | 3.1 | 3.4 | ns |
| tPHZ/tPLZ Propagation Delay | High-to-Hi-Z/low-to-Hi-Z propagation delay | 4.8 | 5.1 | 5.2 | ns |
| CpdA/CpdB Power Dissipation Capacitance | Power dissipation capacitance per transceiver | 3 | - | 15 | pF |
| RθJA Thermal Resistance | Junction-to-ambient thermal resistance (DCU package) | - | - | 246.9 | °C/W |
Key Features
- Active Bus-Hold Circuitry: Holds unused or un-driven inputs at a valid logic state.
- Universal Low-Voltage Translation: Supports bidirectional translation and level-shifting between 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V voltage nodes.
- Partial-Power-Down Capability: Ioff circuitry disables outputs to prevent damaging current backflow when powered down.
- VCC Isolation: Ensures both ports are in a high-impedance state if either VCC input is at GND.
- NanoFree Package Technology: Uses the die as the package, reducing size and enhancing performance.
Applications
- Asynchronous Communication: Designed for communication between two data buses.
- Level-Shifting: Ideal for translating signals between different voltage domains.
- Low-Power Systems: Suitable for systems requiring low power consumption and efficient power management.
- Embedded Systems: Used in various embedded systems requiring reliable and efficient data transmission.
Q & A
- What is the voltage range supported by the SN74AVCH2T45?
The device supports supply voltages from 1.2V to 3.6V for both VCCA and VCCB.
- 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 Ioff circuitry function?
The Ioff circuitry disables the outputs to prevent damaging current backflow when the device is powered down.
- What is the significance of VCC isolation in this device?
VCC isolation ensures that if either VCC input is at GND, both ports are put in a high-impedance state.
- What package options are available for the SN74AVCH2T45?
The device is available in DCT (SSOP), DCU (VSSOP), and YZP (DSBGA) packages.
- What is the thermal resistance of the DCU package?
The junction-to-ambient thermal resistance (RθJA) for the DCU package is 246.9°C/W.
- How does the direction-control (DIR) pin function?
The DIR pin controls the direction of data transmission between the A and B ports.
- What is the typical propagation delay for this device?
The typical propagation delay (tPLH/tPHL) ranges from 2.9ns to 3.4ns.
- Is the SN74AVCH2T45 suitable for low-power applications?
Yes, it is designed for low-power systems and supports partial-power-down applications.
- What is the operating temperature range of the SN74AVCH2T45?
The device operates within a temperature range of -40°C to 85°C.
