$arSelect = Array("ID", "IBLOCK_ID", "NAME", "DATE_ACTIVE_FROM","PROPERTY_*","TIMESTAMP_X");
$arFilter = Array("IBLOCK_ID"=>$elementIdBlock, "ACTIVE_DATE"=>"Y", "ACTIVE"=>"Y", 'DATE_MODIFY_FROM' =>date($DB->DateFormatToPHP(FORMAT_DATETIME), time()-300));
$res = CIBlockElement::GetList(Array("SORT"=>"ASC"), $arFilter, false, Array ("nTopCount" => 5), $arSelect);