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MC74HC138ADTR2G Datasheet(PDF) 5 Page - ON Semiconductor |
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MC74HC138ADTR2G Datasheet(HTML) 5 Page - ON Semiconductor |
5 / 10 page MC74HC138A http://onsemi.com 5 Figure 1. 50% tPHL tPLH VCC GND Figure 2. VALID VALID OUTPUT Y 50% tf tr VCC GND tPLH tTLH 90% 50% 10% OUTPUT Y INPUT CS1 tPHL 90% 50% 10% tTHL INPUT A SWITCHING WAVEFORMS tTHL tTLH VCC GND tr tPHL tPLH OUTPUT Y INPUT CS2, CS3 90% 50% 10% 90% 50% 10% Figure 3. tf *Includes all probe and jig capacitance Figure 4. Test Circuit CL* TEST POINT DEVICE UNDER TEST OUTPUT PIN DESCRIPTIONS ADDRESS INPUTS A0, A1, A2 (Pins 1, 2, 3) Address inputs. These inputs, when the chip is selected, determine which of the eight outputs is active−low. CONTROL INPUTS CS1, CS2, CS3 (Pins 6, 4, 5) Chip select inputs. For CS1 at a high level and CS2, CS3 at a low level, the chip is selected and the outputs follow the Address inputs. For any other combination of CS1, CS2, and CS3, the outputs are at a logic high. OUTPUTS Y0 − Y7 (Pins 15, 14, 13, 12, 11, 10, 9, 7) Active−low Decoded outputs. These outputs assume a low level when addressed and the chip is selected. These outputs remain high when not addressed or the chip is not selected. |
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