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M74HC221 Datasheet(PDF) 4 Page - STMicroelectronics |
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M74HC221 Datasheet(HTML) 4 Page - STMicroelectronics |
4 / 14 page TRUTH TABLE INPUTS OUTPUTS NOTE A B CLR Q Q H H OUTPUT ENABLE X L H L (*) H (*) INHIBIT H X H L (*) H (*) INHIBIT L H OUTPUT ENABLE L H OUTPUT ENABLE X X L L H INHIBIT X: Don’t Care (*): Except for monostble period INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION PIN No SYMBOL NAME AND FUNCTION 1, 9 1A, 2A Trigger Inputs (Negative Edge Triggered) 2, 10 1B, 2B Trigger Inputs (Positive Edge Triggered) 3, 11 1CLR, 2CLR Direct Reset LOW and Trigger Action at Positive Edge 4, 12 1Q, 2Q Outputs (Active LOW) 72REXT/CEXT External Resistor Capacitor Connection 13, 5 1Q, 2Q Outputs (Active HIGH) 14, 6 1CEXT 2CEXT External Capacitor Connection 15 1REXT/CEXT External Resistor Capacitor Connection 8 GND Ground (0V) 16 VCC Positive Supply Voltage IEC LOGIC SYMBOL M54/M74HC221/221A 4/14 |
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