docs/ULL/physical_verification/design_manual/drm_07_14.rst

7.14 Vian (where n = 1 to 5)
=================================

For better yield and reliability try to avoid single vias on any layer (put multiple). Vian stack2 over contact is permitted

 .. csv-table:: VIAN
    :file: tables_clear/7.14_Vian.csv
    :widths: 100, 200 , 300

.. note::

    1. Applies to all < 0.34μm wide metal lines, excluding metal branches shorter than 0.28μm.
    
    2. VIAn is stacked if any portion of it intersects VIA [n+1] or VIA [n-1], or contact if n=1.
    
    3. For better yield and reliability try to avoid single vias on any layer (put multiple)
    

.. image:: images/Vian.png
    :width: 800
    :align: center
    :alt: vian