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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HD74AC датащи(PDF) 31 Page - Hitachi Semiconductor |
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HD74AC датащи(HTML) 31 Page - Hitachi Semiconductor |
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31 / 52 page  Definition of Specifications 30 Symbol Term Description t rec Recovery time Time period between the time when data at the specified input terminal is released and the time when another related input terminal (e.g., clock input) can be changed C IN Input capacitance Capacitance between GND terminal and an input terminal to which 0 V is applied C PD Power Dissipation Capacitance Equivalent device power capacitance in dynamic state Table 7 Explanation of Symbols Used in Function Tables Symbol Description H High level (in steady state; written H or "H" level in sentences) L Low level (in steady state; written L or "L" level in sentences) Transition from L level to H level Transition from H level to L level X Either H or L Z 3-state output off (high impedance) a·····h Input level of steady state for each of inputs A-H Q 0 Q level immediately before the indicated input condition is established Q 0 Complement of Q 0 Q n Q level immediately before the latest active change ( or ) occurs Single H level pulse Single L level pulse TOGGLE Each output is changed to the complement of the preceding state by an active input change ( or ) |
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