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K155TL1 Series TTL integrated circuit. Microchips are K155TL1 Schmitt trigger with two logic element input. Contains 44 integral element. Maximum permissible operating K155TL1: - Power supply .......... 4.75 - 5.25 - Low level input voltage .......... <0.4 - High level input voltage .......... > 2.4 V - Low level input current .......... <16 mA - High level output current .......... <0.8 mA - Load Capacity .......... <15 pF - Rise and fall of input pulse <150 ns