Note 1: The Absolute Maximum Ratings are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at . SN, SN74LS86A, SN74S86 . Reproduction of significant portions of TI information in TI data sheets is permissible only if reproduction is without alteration. Electrical Characteristics: (Note 2, Note 3). Parameter. Symbol. Test Conditions. Min. Typ. Max Unit. High-Level Voltage. VIH. 2. -. -. V. Low-Level Voltage. VIL.