3.3 -V具有三态输出的八路ABT总线收发器 3.3-V ABT OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS
These octal bus transceivers 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 designed for asynchronous communication between data buses. They transmit data from the A bus to the B bus or from the B bus to the A bus, depending on the logic level at the direction-control DIR input. The output-enable OE\ input can be used to disable the devices so the buses are effectively isolated.
Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level. Use of pullup or pulldown resistors with the bus-hold circuitry is not recommended.
The B-port outputs, which are designed to source or sink up to 12 mA, include equivalent 22- series resistors to reduce overshoot and undershoot.
When VCC is between 0 and 1.5 V, the devices are in the high-impedance state during power up or power down. However, to ensure the high-impedance state above 1.5 V, 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.
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.
型号/品牌 | 代替类型 | 替代型号对比 |
---|---|---|
SN74LVTH2245DGVR TI 德州仪器 | 当前型号 | 当前型号 |
74LVTH2245DGVRE4 德州仪器 | 完全替代 | SN74LVTH2245DGVR和74LVTH2245DGVRE4的区别 |
74LVTH2245MTC 飞兆/仙童 | 类似代替 | SN74LVTH2245DGVR和74LVTH2245MTC的区别 |
74LVTH2245MTCX 飞兆/仙童 | 类似代替 | SN74LVTH2245DGVR和74LVTH2245MTCX的区别 |