具有三态输出的 3.3V ABT 八路缓冲器/驱动器
These octal buffers and line drivers are designed specifically for low-voltage 3.3-V VCC operation, but with the capability to provide a TTL interface to a 5-V system environment.
These devices are organized as two 4-bit buffer/line drivers with separate output-enable OE\ inputs. When OE\ is low, the devices pass data from the A inputs to the Y outputs. When OE\ is high, the outputs are in the high-impedance state.
To ensure the high-impedance state during power up or power down, OE\ should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
Active bus-hold circuitry holds unused or undriven inputs at a valid logic state. Use of pullup or pulldown resistors with the bus-hold circuitry is not recommended.
These devices are fully specified for hot-insertion applications using Ioff and power-up 3-state. The Ioff circuitry disables the outputs, preventing damaging current backflow through the devices when they are powered down. The power-up 3-state circuitry places the outputs in the high-impedance state during power up and power down, which prevents driver conflict.
<0.8 V at VCC = 3.3 V, TA = 25°C
型号/品牌 | 代替类型 | 替代型号对比 |
---|---|---|
SN74LVTH240 TI 德州仪器 | 当前型号 | 当前型号 |
SN54LVTH240 德州仪器 | 功能相似 | SN74LVTH240和SN54LVTH240的区别 |