Overview
The SN74LVC2T45DCTTG4, produced by Texas Instruments, is a dual-bit noninverting bus transceiver designed for asynchronous communication between two data buses. This device features a fully configurable dual-rail design, allowing each port to operate over a wide power-supply range from 1.65 V to 5.5 V. This flexibility enables universal low-voltage bidirectional translation between various voltage nodes such as 1.8 V, 2.5 V, 3.3 V, and 5 V.
The device is equipped with a direction-control (DIR) input circuit referenced to VCCA, which activates either the B-port outputs or the A-port outputs. It supports partial-power-down applications using Ioff circuitry, which prevents damaging current backflow when the device is powered down. The VCC isolation feature ensures that both ports are in the high-impedance state if either VCC input is at GND.
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 (A port), VCCB + 0.5 (B port) | V |
| Continuous Output Current (IO) | -50 | 50 | mA |
| Maximum Data Rates | 420 Mbps (3.3 V to 5 V), 210 Mbps (to 3.3 V), 140 Mbps (to 2.5 V), 75 Mbps (to 1.8 V) | Mbps | |
| Junction Temperature (TJ) | 150 | °C | |
| Storage Temperature (Tstg) | -65 | 150 | °C |
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 Texas Instruments NanoFree™ package.
- ±24-mA output drive at 3.3 V.
- Ioff supports Partial-Power-Down mode operation.
- Latch-up performance exceeds 100 mA per JESD 78, Class II.
- ESD protection exceeds JESD 22 – 4000-V Human-Body Model, 200-V Machine Model, and 1000-V Charged-Device Model.
Applications
The SN74LVC2T45DCTTG4 is suitable for various applications requiring asynchronous communication between two data buses with different voltage levels. This includes:
- Universal low-voltage bidirectional translation between 1.8 V, 2.5 V, 3.3 V, and 5 V voltage nodes.
- Partial-power-down applications where Ioff circuitry is necessary to prevent current backflow.
- Systems requiring high-speed data transmission, such as in telecommunications and enterprise environments.
- Embedded systems and IoT devices that need flexible voltage translation and low power consumption.
Q & A
- What is the power supply range for the SN74LVC2T45DCTTG4?
The device operates over a full 1.65-V to 5.5-V power-supply range for both VCCA and VCCB.
- What is the purpose of the DIR input circuit?
The DIR input circuit, referenced to VCCA, activates either the B-port outputs or the A-port outputs for data transmission.
- What is the maximum data rate for the SN74LVC2T45DCTTG4?
The maximum data rates are 420 Mbps (3.3 V to 5 V), 210 Mbps (to 3.3 V), 140 Mbps (to 2.5 V), and 75 Mbps (to 1.8 V).
- Does the SN74LVC2T45DCTTG4 support partial-power-down mode?
- What is the output drive capability of the SN74LVC2T45DCTTG4?
The device has a ±24-mA output drive at 3.3 V.
- What are the ESD protection levels for the SN74LVC2T45DCTTG4?
The device has ESD protection exceeding JESD 22 – 4000-V Human-Body Model, 200-V Machine Model, and 1000-V Charged-Device Model.
- What packages are available for the SN74LVC2T45DCTTG4?
The device is available in DCT (SM8, 8-pin), DCU (VSSOP, 8-pin), and YZP (DSBGA, 8-pin) packages.
- What is the junction temperature range for the SN74LVC2T45DCTTG4?
The junction temperature range is up to 150°C.
- What is the storage temperature range for the SN74LVC2T45DCTTG4?
The storage temperature range is from -65°C to 150°C.
- What is the VCC isolation feature of the SN74LVC2T45DCTTG4?
If either VCC input is at GND, both ports are in the high-impedance state.
