Overview
The SN74LVCH8T245PWR is an 8-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 either the B-port outputs, the A-port outputs, or place both output ports into a high-impedance state.
Key Specifications
| Parameter | Description |
|---|---|
| Number of Bits | 8-bit |
| Power Supply Range | 1.65 V to 5.5 V (VCCA and VCCB) |
| Operating Temperature Range | -40°C to 85°C |
| Package Types | SSOP (24 pins), TVSOP (24 pins), TSSOP (24 pins), VQFN (24 pins) |
| Package Dimensions | SSOP: 8.65 mm × 3.90 mm, TVSOP: 5.00 mm × 4.40 mm, TSSOP: 7.80 mm × 4.40 mm, VQFN: 5.50 mm × 3.50 mm |
| 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 |
| Partial-Power-Down Mode | Supported using Ioff circuitry |
Key Features
- Control inputs (DIR and OE) VIH and 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.
- Bus hold on data inputs eliminates the need for external pullup and pulldown resistors.
- Latch-up performance exceeds 100 mA per JESD 78, class II.
- ESD protection exceeds JESD 22 standards.
- Partial-power-down mode operation using Ioff circuitry.
Applications
- Personal electronics
- Industrial applications
- Enterprise systems
- Telecommunications
Q & A
- What is the primary function of the SN74LVCH8T245PWR?
The SN74LVCH8T245PWR is an 8-bit non-inverting bus transceiver designed for bidirectional voltage level translation between two data buses.
- What is the operating voltage range for VCCA and VCCB?
VCCA and VCCB can operate at any voltage between 1.65 V and 5.5 V.
- What are the package options available for the SN74LVCH8T245PWR?
The device is available in SSOP, TVSOP, TSSOP, and VQFN packages.
- How does the VCC isolation feature work?
If either VCC input is at GND, all outputs are placed in the high-impedance state.
- What is the purpose of the Ioff circuitry?
The Ioff circuitry disables the outputs to prevent damaging current backflow during partial-power-down applications.
- What kind of ESD protection does the device offer?
The device offers ESD protection exceeding JESD 22 standards, including 4000-V Human-Body Model, 100-V Machine Model, and 1000-V Charged-Device Model.
- How do the control inputs (DIR and OE) function?
The control inputs (DIR and OE) activate either the B-port outputs, the A-port outputs, or place both output ports into a high-impedance state.
- What is the significance of the bus hold feature?
The bus hold feature eliminates the need for external pullup and pulldown resistors by holding unused or undriven inputs at a valid logic state.
- What are the typical applications of the SN74LVCH8T245PWR?
The device is used in personal electronics, industrial applications, enterprise systems, and telecommunications.
- How should the OE pin be configured during power-up or power-down to ensure high-impedance state?
The OE pin should be tied to VCCA through a pullup resistor to ensure the high-impedance state during power-up or power-down.
- What is the operating temperature range of the SN74LVCH8T245PWR?
The operating temperature range is from -40°C to 85°C.
