K155LR4 Integral chip of the TTL series. Microchips K155LR4 represent logic element 4-4I-2or-NO expandable by OR. They contain 22 integral elements. K155LR4: - Supply voltage .......... 4.75 - 5.25 V - Low level input voltage .......... <0.4 V - High level input voltage ..........> 2.4 V - Low level input current .......... <16 mA - High level output current .......... <0.8 mA - Loading capacity .......... <15 pF - Duration of front and cutoff of input pulse <150 ns