Overview
The SN74LVC8T245DWRG4, produced by Texas Instruments, is an 8-bit non-inverting bus transceiver designed with configurable dual power supply rails. This device enables bidirectional voltage level translation between two data buses, making it highly versatile for various low-voltage applications. The SN74LVC8T245 operates with VCCA and VCCB set at any voltage between 1.65 V and 5.5 V, allowing universal translation between 1.8-V, 2.5-V, 3.3-V, and 5.5-V voltage nodes.
Key Specifications
| Parameter | Description |
|---|---|
| Operating Voltage Range (VCCA and VCCB) | 1.65 V to 5.5 V |
| Operating Temperature Range | -40°C to 85°C |
| Low-Level Output Current (IOL) | 4 mA (1.65 V to 1.95 V), 8 mA (2.3 V to 2.7 V), 24 mA (3 V to 3.6 V), 32 mA (4.5 V to 5.5 V) |
| Input Transition Rise or Fall Rate | 20 ns/V (1.65 V to 2.7 V), 10 ns/V (3 V to 3.6 V), 5 ns/V (4.5 V to 5.5 V) |
| Latch-Up Performance | Exceeds 100 mA per JESD 78, Class II |
| ESD Protection | 4000-V Human-Body Model, 100-V Machine Model, 1000-V Charged-Device Model |
| Package Options | DBV (SSOP, 24), DBQ (SSOP, 24), PW (TSSOP, 24), DGV (TVSOP, 24), RHL (VQFN, 24) |
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 standards.
- Designed for asynchronous communication between two data buses with direction-control (DIR) and output-enable (OE) inputs.
- Ioff circuitry disables outputs during power-down to prevent damaging current backflow.
Applications
- Personal electronic devices.
- Industrial applications.
- Enterprise systems.
- Telecom equipment.
Q & A
- What is the operating voltage range of the SN74LVC8T245? The operating voltage range for both VCCA and VCCB is 1.65 V to 5.5 V.
- What is the purpose of the DIR and OE inputs? The DIR input controls the direction of data transmission (A to B or B to A), and the OE input enables or disables the output ports.
- What is the VCC isolation feature? If either VCC input is at GND, all outputs are in the high-impedance state.
- What are the ESD protection levels of the SN74LVC8T245? The device has ESD protection exceeding 4000-V Human-Body Model, 100-V Machine Model, and 1000-V Charged-Device Model.
- What is the latch-up performance of the SN74LVC8T245? The latch-up performance exceeds 100 mA per JESD 78, Class II.
- Can the SN74LVC8T245 be used in partial-power-down applications? Yes, the device is fully specified for partial-power-down applications using Ioff circuitry.
- What are the package options available for the SN74LVC8T245? The device is available in DBV (SSOP, 24), DBQ (SSOP, 24), PW (TSSOP, 24), DGV (TVSOP, 24), and RHL (VQFN, 24) packages.
- What is the operating temperature range of the SN74LVC8T245? The operating temperature range is -40°C to 85°C.
- How does the SN74LVC8T245 handle input transition rates? The device can handle input transition rates of up to 20 ns/V for lower voltages and 5 ns/V for higher voltages.
- What should be done to ensure high-impedance state during power-up or power-down? The OE should be tied to VCC through a pullup resistor to ensure the high-impedance state.
