Overview
The SN74LXCH8T245PWR is an 8-bit, dual-supply noninverting bidirectional voltage level translation device produced by Texas Instruments. This component features bus-hold circuitry and is designed to operate with a wide range of voltage levels, making it versatile for various applications. The device allows data transmission between two ports (A and B) with independent power-supply rails (VCCA and VCCB), each capable of operating from 1.1 V to 5.5 V. The control pins (DIR and OE) are referenced to VCCA, enabling flexible data direction control and output enable/disable functionality.
Key Specifications
| Parameter | Value |
|---|---|
| Package | TSSOP (24 pins) |
| Operating Temperature Range | –40°C to 125°C |
| VCCA and VCCB Voltage Range | 1.1 V to 5.5 V |
| Data Transmission Speed | Up to 420 Mbps (for 3.3 V to 5.0 V) |
| Power Consumption | 4 µA (max at 25°C), 12 µA (max from –40°C to 125°C) |
| ESD Protection | Exceeds JESD 22 – 4000-V Human-Body 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 from 1.1 V to 5.5 V.
- Robust, glitch-free power supply sequencing.
- Bus-hold on data inputs eliminates the need for external pull-up and pull-down resistors.
- Schmitt-trigger control inputs allow for slow or noisy inputs.
- Control inputs with integrated static pull-down resistors allow for floating control inputs.
- High drive strength (up to 32 mA at 5 V).
- Low power consumption.
- VCC isolation and VCC disconnect feature to ensure high-impedance state during power-down.
- Partial power-down mode operation to limit backflow current.
- Compatible with LVC family level shifters.
Applications
- General purpose I/O level shifting.
- Driving indicator LEDs or buzzers.
- Debouncing a mechanical switch.
- Push-pull level shifting (UART, SPI, JTAG, etc.).
- Eliminating slow or noisy input signals.
Q & A
- What is the SN74LXCH8T245PWR used for?
The SN74LXCH8T245PWR is used for bidirectional voltage level translation between two different voltage domains, making it suitable for various applications requiring level shifting.
- What is the operating temperature range of the SN74LXCH8T245PWR?
The operating temperature range is from –40°C to 125°C.
- What are the voltage ranges for VCCA and VCCB?
Both VCCA and VCCB can operate from 1.1 V to 5.5 V.
- What is the maximum data transmission speed supported by the SN74LXCH8T245PWR?
Up to 420 Mbps for translations between 3.3 V and 5.0 V.
- How does the bus-hold feature work?
The bus-hold feature holds unused or undriven inputs at a valid logic state, eliminating the need for external pull-up or pull-down resistors.
- What kind of ESD protection does the SN74LXCH8T245PWR have?
It exceeds JESD 22 standards with 4000-V Human-Body Model and 1000-V Charged-Device Model protection.
- How does the VCC isolation feature work?
If either VCC supply is below 100 mV, all I/Os become high-impedance, effectively isolating both buses in a power-down scenario.
- Is the SN74LXCH8T245PWR compatible with other level shifters?
Yes, it is compatible with LVC family level shifters.
- What is the power consumption of the SN74LXCH8T245PWR?
The maximum power consumption is 4 µA at 25°C and 12 µA from –40°C to 125°C.
- How do the control pins (DIR and OE) function?
The DIR pin controls the direction of data transmission, and the OE pin enables or disables the outputs, placing them in a high-impedance state when set to high.
- What is the latch-up performance of the SN74LXCH8T245PWR?
It exceeds 100 mA per JESD 78, Class II.
