YII Using cache in CActiveDataProvider

$dependecy = new CDbCacheDependency('SELECT MAX(update_time) FROM {{post}}')

CActiveDataProvider(Post::model()->cache($duration, $dependecy, 2), array (
    'criteria' => array (
        'condition' => 'status = 1',
        'order' => 'DESC create_time',
    )
    'pagination' => array (
        'pageSize' => 20,
    )
));