Overview
The SN74LVC8T245DGVR, produced by Texas Instruments, is an eight-bit non-inverting bus transceiver designed for bidirectional voltage level translation. This device is optimized to operate with dual power supply rails, allowing each port to function over a wide voltage range from 1.65 V to 5.5 V. It is particularly useful for asynchronous communication between two data buses, enabling universal low-voltage bidirectional translation between various voltage nodes such as 1.8 V, 2.5 V, 3.3 V, and 5.5 V.
Key Specifications
| Parameter | Value |
|---|---|
| Package Type | TVSOP (DGV), 24 pins |
| Operating Temperature Range | -40°C to 85°C |
| Supply Voltage Range (VCCA and VCCB) | 1.65 V to 5.5 V |
| Control Input Levels (VIH/VIL) | Referenced to VCCA voltage |
| ESD Protection | 4000-V Human-Body Model, 100-V Machine Model, 1000-V Charged-Device Model |
| Latch-up Performance | Exceeds 100 mA per JESD 78, class II |
| Thermal Resistance (RθJA) | 91.1 °C/W (DGV package) |
Key Features
- Control inputs VIH/VIL levels are referenced to VCCA voltage.
- VCC isolation feature – if either VCC input is at GND, all outputs are in the high-impedance state.
- Fully configurable dual-rail design allows each port to operate over the full 1.65-V to 5.5-V power-supply range.
- ESD protection exceeds JESD 22 standards (4000-V Human-Body Model, 100-V Machine Model, 1000-V Charged-Device Model).
- Latch-up performance exceeds 100 mA per JESD 78, class II.
- Designed for asynchronous communication between two data buses with direction-control (DIR) and output-enable (OE) inputs.
- Fully specified for partial-power-down applications using Ioff circuitry.
Applications
The SN74LVC8T245DGVR is widely used in various applications requiring bidirectional voltage level translation, such as:
- Asynchronous communication between different voltage domains in a system.
- Interface translation between different logic families (e.g., 1.8 V, 2.5 V, 3.3 V, 5.5 V).
- Partial-power-down applications where power management is critical.
- Systems requiring high ESD protection and latch-up performance.
Q & A
- What is the primary function of the SN74LVC8T245DGVR?
The primary function is to perform bidirectional voltage level translation between two data buses.
- What is the operating voltage range for the SN74LVC8T245DGVR?
The device operates over a voltage range of 1.65 V to 5.5 V for both VCCA and VCCB.
- What type of package is available for the SN74LVC8T245DGVR?
The device is available in a 24-pin TVSOP (DGV) package among others.
- What are the key control inputs for the SN74LVC8T245DGVR?
The key control inputs are the direction-control (DIR) and output-enable (OE) inputs.
- How does the VCC isolation feature work?
If either VCC input is at GND, all outputs are in the high-impedance state.
- What is the ESD protection level of the SN74LVC8T245DGVR?
The device has ESD protection exceeding 4000-V Human-Body Model, 100-V Machine Model, and 1000-V Charged-Device Model.
- Is the SN74LVC8T245DGVR suitable for partial-power-down applications?
Yes, it is fully specified for partial-power-down applications using Ioff circuitry.
- What is the thermal resistance (RθJA) of the DGV package?
The thermal resistance (RθJA) for the DGV package is 91.1 °C/W.
- How do the DIR and OE inputs control the data transmission?
The DIR input controls the direction of data transmission, and the OE input enables or disables the outputs. When OE is low and DIR is high, data is transmitted from A to B. When OE is low and DIR is low, data is transmitted from B to A. When OE is high, both output ports are in the high-impedance state.
- What are the typical applications of the SN74LVC8T245DGVR?
Typical applications include asynchronous communication between different voltage domains, interface translation between different logic families, and partial-power-down applications.
