Overview
The SN74LVC8T245 is an eight-bit non-inverting bus transceiver produced by Texas Instruments. This device is designed with configurable dual power supply rails, enabling bidirectional voltage level translation. It operates with VCCA and VCCB set at any voltage between 1.65 V and 5.5 V, making it suitable for universal low-voltage bidirectional translation between various voltage nodes such as 1.8 V, 2.5 V, 3.3 V, and 5.5 V. The device is optimized for asynchronous communication between two data buses and features control inputs (DIR and OE) that activate or place the output ports into high-impedance mode.
Key Specifications
| Parameter | Unit | Min | Max | Notes |
|---|---|---|---|---|
| Operating Temperature Range | °C | -40 | 85 | |
| VCCA and VCCB Voltage Range | V | 1.65 | 5.5 | |
| Low-level Output Current (IOL) | mA | 4 (1.65 V to 1.95 V) | 32 (4.5 V to 5.5 V) | Varying with voltage range |
| Input Transition Rise or Fall Rate (Δt/Δv) | ns/V | 5 (4.5 V to 5.5 V) | 20 (1.65 V to 1.95 V) | Varying with voltage range |
| Latch-up Performance | mA | 100 | Per JESD 78, class II | |
| ESD Protection | V | 4000 (Human-Body Model) | 1000 (Charged-Device Model) | Per JESD 22 |
| Package Types | DBV, DBQ, PW, DGV, RHL | Different package options available |
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
- Latch-up performance exceeds 100 mA per JESD 78, class II
- ESD protection exceeds JESD 22 – 4000-V Human-Body Model, 100-V Machine Model, 1000-V Charged-Device Model
- Partial-power-down applications using Ioff circuitry to prevent damaging current backflow
Applications
- Personal electronic devices
- Industrial applications
- Enterprise systems
- Telecom equipment
Q & A
- What is the primary function of the SN74LVC8T245?
The SN74LVC8T245 is an eight-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 operate at any voltage between 1.65 V and 5.5 V.
- How does the direction-control (DIR) input work?
The DIR input controls the direction of data transmission. A high DIR allows data transmission from A to B, while a low DIR allows data transmission from B to A.
- What is the purpose of the output-enable (OE) input?
The OE input activates or places the output ports into high-impedance mode. When OE is low, the outputs are enabled; when OE is high, the outputs are in high-impedance state.
- What is the VCC isolation feature?
If either VCC input is at GND, all outputs are in the high-impedance state, ensuring safe operation during power-up or power-down.
- What kind of ESD protection does the SN74LVC8T245 have?
The device has ESD protection exceeding JESD 22 standards, including 4000-V Human-Body Model, 100-V Machine Model, and 1000-V Charged-Device Model.
- Can the SN74LVC8T245 be used in partial-power-down applications?
Yes, the device is fully specified for partial-power-down applications using Ioff circuitry to prevent damaging current backflow.
- What are the typical applications for the SN74LVC8T245?
The device is suitable for personal electronic devices, industrial applications, enterprise systems, and telecom equipment.
- What are the available package types for the SN74LVC8T245?
The device is available in various package types including DBV, DBQ, PW, DGV, and RHL.
- What is the operating temperature range for the SN74LVC8T245?
The operating temperature range is from -40°C to 85°C.
