SCLS261O October 1995 – September 2015 SN54AHC541 , SN74AHC541
请参考 PDF 数据表获取器件具体的封装图。
The SNx4AHC541 octal buffers/drivers are ideal for driving bus lines or buffer memory address registers. These devices feature inputs and outputs on opposite sides of the package to facilitate printed circuit board layout.
The 3-state control gate is a two-input AND gate with active-low inputs. If either output-enable (OE1 or OE2) input is high, all corresponding outputs are in the high-impedance state. The outputs provide noninverted data when they are not 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.
The SNx4AHC541 has a wide operating voltage range of 2 V to 5.5 V. It allows down voltage translations while accepting input voltages of up to 5.5 V. The slow edges of the SNx4AHC541 enables the reduction of output ringing.
Table 1 lists the functional modes for the SNx4AHC541 devices.
INPUTS | OUTPUT Y |
||
---|---|---|---|
OE1 | OE2 | A | |
L | L | L | L |
L | L | H | H |
H | X | X | Z |
X | H | X | Z |