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SN74LS221D Datasheet(PDF) 2 Page - ON Semiconductor |
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SN74LS221D Datasheet(HTML) 2 Page - ON Semiconductor |
2 / 8 page SN74LS221 http://onsemi.com 2 (TOP VIEW) Positive logic: Low input to clear resets Q low and Positive logic: Q high regardless of dc levels at A Positive logic: or B inputs. 14 13 12 11 10 9 12345 6 7 16 15 8 VCC 1A 1 Rext/ Cext 1 Cext 1Q 2Q 2B 2 CLR 2A 1B 1 CLR 1Q 2Q 2 Cext 2 Rext/ Cext GND Q Q CLR Q Q CLR + VCC Rext R/C Cext FUNCTION TABLE (EACH MONOSTABLE) INPUTS OUTPUTS CLEAR A B Q Q L X X L H X H XL H X X LL H H L ° H ± H * ° L H *See operational notes — Pulse Trigger Modes TYPE TYPICAL POWER MAXIMUM OUTPUT PULSE DISSIPATION LENGTH SN74LS221 23 mW 70 s |
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