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5962-0720102M3A Datasheet(PDF) 5 Page - ATMEL Corporation |
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5962-0720102M3A Datasheet(HTML) 5 Page - ATMEL Corporation |
5 / 25 page 5 0776L–PLD–11/08 ATF750C(L) 9. Bus-friendly Pin-keeper Input and I/Os All input and I/O pins on the ATF750C(L) have programmable “pin-keeper” circuits. If activated, when any pin is driven high or low and then subsequently left floating, it will stay at that previous high or low level. This circuitry prevents unused input and I/O lines from floating to intermediate voltage levels, which causes unnecessary power consumption and system noise. The keeper circuits eliminate the need for external pull-up resistors and eliminate their DC power consumption. Enabling or disabling of the pin-keeper circuits is controlled by the device type chosen in the logic compiler device selection menu. Please refer to the software compiler table for more details. Once the pin-keeper circuits are disabled, normal termination procedures are required for unused inputs and I/Os. 10. Input Diagram 11. I/O Diagram 100K V CC ESD PROTECTION CIRCUIT INPUT PROGRAMMABLE OPTION 100K V CC V CC DATA OE I/O PROGRAMMABLE OPTION |
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