Rainbow-electronics ATF1504ASVL Manuel d'utilisateur télécharger pdf (Page 7)

ATF1504ASV(L)

1409H–PLD–09/02

Figure 1. ATF1504ASV(L)Macrocell

Programmable Pin-keeper Option for Inputs and I/Os

The ATF1504ASV(L)offers the option of programming all input and I/Opinssothatpinkeepercircuitscanbe utilized.

Whenanypinisdrivenhighorlowandthen subsequently left floating, it will stay at that previous high- or low-level. This cir-

cuitry prevents unusedinputandI/Olines from floating to intermediatevoltage levels, which causesunnecessary power

consumption and system noise. The keepercircuitseliminate the needforexternal pull-up resistors and eliminate their DC

power consumption.

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Rainbow-electronics ATF1504ASVL Manuel d'utilisateur Page 7