Overview
The SN74LVCH8T245RHLR, produced by Texas Instruments, is an 8-bit noninverting bus transceiver designed for bidirectional voltage level translation. This device features a fully configurable dual-rail design, allowing each port to operate over a wide power-supply range from 1.65 V to 5.5 V. This makes it suitable for translating between various voltage nodes such as 1.8 V, 2.5 V, 3.3 V, and 5 V. The SN74LVCH8T245 is optimized for asynchronous communication between two data buses, with control inputs (DIR and OE) referenced to VCCA. The device ensures high-impedance state during power-up or power-down and supports partial-power-down applications using Ioff circuitry.
Key Specifications
| Parameter | Description |
|---|---|
| Number of Bits | 8-bit |
| Power Supply Range | 1.65 V to 5.5 V (VCCA and VCCB) |
| Package Options | DB (SSOP, 24), DGV (TVSOP, 24), PW (TSSOP, 24), RHL (VQFN, 24) |
| Operating Temperature Range | -40°C to 85°C |
| 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 |
| Control Inputs | DIR and OE inputs referenced to VCCA |
| Bus Hold | Active bus-hold circuitry on both A and B ports |
| Partial-Power-Down Mode | Ioff circuitry supports partial-power-down applications |
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.
- Control inputs (DIR and OE) referenced to VCCA.
- VCC isolation feature – if either VCC input is at GND, all outputs are in the high-impedance state.
- Active bus-hold circuitry on both A and B ports eliminates the need for external pullup and pulldown resistors.
- Ioff supports partial-power-down node operation.
- Latch-up performance exceeds 100 mA per JESD 78, class II.
- ESD protection exceeds JESD 22.
Applications
- Personal electronics
- Industrial applications
- Enterprise systems
- Telecommunications
Q & A
- What is the primary function of the SN74LVCH8T245RHLR?
The SN74LVCH8T245RHLR is an 8-bit noninverting bus transceiver designed for bidirectional voltage level translation between two data buses.
- What is the power supply range for the SN74LVCH8T245RHLR?
The device operates over a power supply range from 1.65 V to 5.5 V for both VCCA and VCCB.
- What are the package options available for the SN74LVCH8T245RHLR?
The device is available in DB (SSOP, 24), DGV (TVSOP, 24), PW (TSSOP, 24), and RHL (VQFN, 24) packages.
- What is the operating temperature range for the SN74LVCH8T245RHLR?
The operating temperature range is -40°C to 85°C.
- 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 purpose of the Ioff circuitry?
The Ioff circuitry supports partial-power-down applications by disabling the outputs and preventing damaging current backflow through the device.
- What kind of ESD protection does the SN74LVCH8T245RHLR offer?
The device offers ESD protection exceeding JESD 22, 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) are referenced to VCCA and control the direction of data transmission and the output enable state.
- What is the purpose of the bus-hold circuitry?
The bus-hold circuitry on both A and B ports eliminates the need for external pullup and pulldown resistors by holding unused or undriven inputs at a valid logic state.
- In which sectors is the SN74LVCH8T245RHLR commonly used?
The device is commonly used in personal electronics, industrial applications, enterprise systems, and telecommunications.
