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BUFOD

Open-Drain Buffer

XC3000
XC4000E
XC4000X
XC5200
XC9000
Spartan
SpartanXL
Virtex
N/A
Macro
Macro
N/A
N/A
N/A
N/A
N/A

figures/x3903n.gif

BUFOD is a buffer with input (I) and open-drain output (O). When the input is Low, the output is Low. When the input is High, the output is off. To establish an output High level, a pull-up resistor is tied to output O. One pull-up resistor uses the least power; two pull-up resistors achieve the fastest Low-to-High speed.

To indicate two pull-up resistors, append a DOUBLE parameter to the pull-up symbol attached to the output (O) node. Refer to the appropriate CAE tool interface user guide for details.

Figure 3.40 BUFOD Implementation XC4000

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