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74HC221 데이터시트(PDF) 4 Page - NXP Semiconductors |
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74HC221 데이터시트(HTML) 4 Page - NXP Semiconductors |
4 / 15 page December 1990 4 Philips Semiconductors Product specification Dual non-retriggerable monostable multivibrator with reset 74HC/HCT221 Fig.4 Functional diagram. FUNCTION TABLE Notes 1. H = HIGH voltage level L = LOW voltage level X = don’t care ↑ = LOW-to-HIGH level ↓ = HIGH-to-LOW level = one HIGH-level output pulse = one LOW-level output pulse 2. If the monostable was triggered before this condition was established the pulse will continue as programmed. 3. For this combination the reset input must be LOW and the following sequence must be used: pin 1 (or 9) must be set HIGH or pin 2 (or 10) set LOW; then pin 1 (or 9) must be LOW and pin 2 (or 10) set HIGH. Now the reset input goes from LOW-to-HIGH and the device will be triggered. INPUTS OUTPUTS nRD nAnB nQ nQ LX X L H XH X L (2) H (2) XX L L (2) H (2) HL ↑ H ↓ H ↑ LH (3) (3) |
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