Overview
The SN74AVCH2T45 is a dual-bit dual-supply noninverting bus transceiver designed for asynchronous communication between two data buses. This device features fully configurable dual-rail design, allowing each port to operate over a wide range of power-supply voltages from 1.65V to 5.5V. The SN74AVCH2T45 is ideal for universal low-voltage bidirectional translation between various voltage nodes such as 1.8V, 2.5V, 3.3V, and 5V.
Key Specifications
| Parameter | Min | Max | Unit |
|---|---|---|---|
| VCCA Supply Voltage | 1.65 | 5.5 | V |
| VCCB Supply Voltage | 1.65 | 5.5 | V |
| Input Voltage (VI) | -0.5 | 6.5 | V |
| Output Voltage Range (VO) | -0.5 | VCCA + 0.5 / VCCB + 0.5 | V |
| Continuous Output Current (IO) | -50 | 50 | mA |
| Junction Temperature (TJ) | - | 150 | °C |
| Storage Temperature (Tstg) | -65 | 150 | °C |
| Maximum Data Rates | - | 420 Mbps (3.3V to 5V) | Mbps |
| - | 210 Mbps (translate to 3.3V) | Mbps | |
| - | 140 Mbps (translate to 2.5V) | Mbps | |
| - | 75 Mbps (translate to 1.8V) | Mbps |
Key Features
- Fully configurable dual-rail design allowing each port to operate over the full 1.65-V to 5.5-V power-supply range.
- VCC isolation feature – if either VCC input is at GND, both ports are in the high-impedance state.
- DIR input circuit referenced to VCCA.
- Low power consumption, with a maximum ICC of 4 µA.
- Available in various packages including SSOP (DCT), VSSOP (DCU), and DSBGA (YZP).
- ±24-mA output drive at 3.3 V.
- Ioff supports Partial-Power-Down mode operation, preventing backflow current.
- High-speed translation capabilities with data rates up to 420 Mbps.
- Latch-up performance exceeds 100 mA per JESD 78, Class II.
- ESD protection exceeds JESD 22 standards.
Applications
The SN74AVCH2T45 is suitable for a wide range of applications requiring voltage-level translation between different voltage domains. These include:
- Telecommunication systems
- Enterprise networking equipment
- Consumer electronics
- Industrial control systems
- Automotive systems requiring voltage translation
Q & A
- What is the voltage range for the power supplies VCCA and VCCB?
VCCA and VCCB can operate over a range from 1.65V to 5.5V.
- What is the maximum data rate supported by the SN74AVCH2T45?
The device supports up to 420 Mbps data rate for translation from 3.3V to 5V.
- How does the DIR input control data transmission?
The DIR input controls the direction of data transmission. A high on DIR allows data transmission from A to B, while a low on DIR allows data transmission from B to A.
- What is the purpose of the VCC isolation feature?
If either VCC input is at GND, both ports enter a high-impedance state.
- Does the SN74AVCH2T45 support partial-power-down mode?
Yes, the device supports partial-power-down mode using Ioff, which prevents backflow current when the device is powered down.
- What are the thermal resistance values for the different packages?
The thermal resistance values vary by package, with RθJA ranging from 105.8°C/W to 246.4°C/W depending on the package type.
- What is the ESD protection level of the SN74AVCH2T45?
The device has ESD protection exceeding JESD 22 standards, including 4000-V Human-Body Model, 200-V Machine Model, and 1000-V Charged-Device Model.
- What are the typical propagation delays for the SN74AVCH2T45?
The propagation delays vary based on the load capacitance and the voltage levels, but typical values range from 10 to 30 ns.
- What are the storage and junction temperature limits for the device?
The storage temperature range is -65°C to 150°C, and the junction temperature limit is 150°C.
- In what packages is the SN74AVCH2T45 available?
The device is available in SSOP (DCT), VSSOP (DCU), and DSBGA (YZP) packages.
