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M74HC4538B1R Datasheet(PDF) 4 Page - STMicroelectronics |
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M74HC4538B1R Datasheet(HTML) 4 Page - STMicroelectronics |
4 / 14 page RESET OPERATION CD is normally high. If CD is low, the trigger is not effective because Q output goes low and trigger control flip-flop is reset. Also transistor Op is turned on and Cx is charged quicky to VCC. This means if CD input goes low, the IC becomes waiting state both in operating and non operating state. FUNCTIONAL DESCRIPTION (continued) TRUTH TABLE INPUTS OUTPUTS NOTE AB CD Q Q H H OUTPUT ENABLE X L H L H INHIBIT H X H L H INHIBIT L H OUTPUT ENABLE X X L L H INHIBIT INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION PIN No SYMBOL NAME AND FUNCTION 1, 15 1T1, 2T1 External Capacitor Connections 2, 14 1T2, 2T2 External Resistor/Capacitor Connections 3, 13 1CD, 2CD Direct Reset Inputs (Active LOW) 4, 12 1A, 2A Trigger Inputs (LOW to HIGH, Edge-Triggered) 5, 11 1B, 2B Trigger Inputs (HIGH to LOW, Edge-Triggered) 6, 10 Q1, Q2 Pulse Outputs 7, 9 Q1, Q2 Complementary Pulse Outputs 8 GND Ground (0V) 16 VCC Positive Supply Voltage IEC LOGIC SYMBOL M54/M74HC4538 4/14 |
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Similar Description - M74HC4538B1R |
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