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74F189 Arkusz danych(PDF) 2 Page - Fairchild Semiconductor |
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74F189 Arkusz danych(HTML) 2 Page - Fairchild Semiconductor |
2 / 6 page www.fairchildsemi.com 2 Unit Loading/Fan Out Function Table H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial Block Diagram Pin Names Description U.L. Input IIH/IIL HIGH/LOW Output IOH/IOL A0–A3 Address Inputs 1.0/1.0 20 µA/−0.6 mA CS Chip Select Input (Active LOW) 1.0/1.0 20 µA/−1.2 mA WE Write Enable Input (Active LOW) 1.0/1.0 20 µA/−0.6 mA D0–D3 Data Inputs 1.0/1.0 20 µA/−0.6 mA O 0–O 3 Inverted Data Outputs 150/40 (33.3) −3.0 mA/24 mA (20 mA) Inputs Operation Condition of Outputs CS WE L L Write High Impedance L H Read Complement of Stored Data H X Inhibit High Impedance |
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