Overview
The SN74LVC8T245DBRG4, produced by Texas Instruments, is an 8-bit non-inverting bus transceiver designed for bidirectional voltage level translation. This device features configurable dual power supply rails, allowing each port to operate over a wide voltage range from 1.65 V to 5.5 V. The SN74LVC8T245 is optimized 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 | Description |
|---|---|
| Package | DBRG4 (VQFN, 24 pins) |
| Operating Temperature Range | -40°C to 85°C |
| VCCA and VCCB Voltage Range | 1.65 V to 5.5 V |
| Input/Output Voltage Range | A port: 1.65 V to 5.5 V, B port: 1.65 V to 5.5 V |
| Direction-Control Input (DIR) | High: Data transmission from A to B, Low: Data transmission from B to A |
| Output-Enable Input (OE) | Low: Enable outputs, High: High-impedance state |
| 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 |
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, all outputs are in the high-impedance state
- Control inputs VIH/VIL levels are referenced to VCCA voltage
- ESD protection exceeds JESD 22 standards
- Latch-up performance exceeds 100 mA per JESD 78, class II
- 3-state output mode enables
- Ioff circuitry for partial-power-down applications
Applications
- Personal electronic devices
- Industrial applications
- Enterprise systems
- Telecommunication equipment
Q & A
- What is the primary function of the SN74LVC8T245?
The SN74LVC8T245 is an 8-bit non-inverting bus transceiver designed for bidirectional voltage level translation between two data buses.
- What is the voltage range for VCCA and VCCB?
VCCA and VCCB can be supplied at any voltage between 1.65 V and 5.5 V.
- How does the direction-control input (DIR) work?
A high on DIR allows data transmission from the A bus to the B bus, and a low on DIR allows data transmission from the B bus to the A bus.
- What is the purpose of the output-enable input (OE)?
When OE is low, the outputs are enabled; when OE is high, both output ports are in the high-impedance state.
- What kind of ESD protection does the SN74LVC8T245 offer?
The device offers ESD protection exceeding 4000-V Human-Body Model, 100-V Machine Model, and 1000-V Charged-Device Model.
- 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 significance of Ioff circuitry in the SN74LVC8T245?
The Ioff circuitry disables the outputs during partial-power-down applications, preventing damaging current backflow through the device.
- What are the typical applications of the SN74LVC8T245?
The device is used in personal electronic devices, industrial applications, enterprise systems, and telecommunication equipment.
- What is the operating temperature range of the SN74LVC8T245?
The operating temperature range is from -40°C to 85°C.
- How does the latch-up performance of the SN74LVC8T245 compare to industry standards?
The latch-up performance exceeds 100 mA per JESD 78, class II.
