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M54HC4518 Datasheet(PDF) 4 Page - STMicroelectronics |
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M54HC4518 Datasheet(HTML) 4 Page - STMicroelectronics |
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4 / 13 page 
TRUTH TABLE INPUTS FUNCTION CLOCK ENABLE CLEAR H L INCREMENT COUNTER L L INCREMENT COUNTER X L NO CHANGE X L NO CHANGE L L NO CHANGE H L NO CHANGE X X H Q0 THRU Q3 = L X: Don’t Care Z: High Impedance INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION PIN No SYMBOL NAME AND FUNCTION 1, 9 1CLOCK, 2CLOCK Clock Inputs (LOW to HIGH, Edge-triggered) 2, 10 1ENABLE, 2ENABLE Clock Enable Inputs 3, 4, 5, 6 1Q0 to 1Q3 Data Outputs 7, 15 1CLEAR, 2CLEAR Asynchronous Reset Inputs (Active LOW) 11, 12, 13, 14 2Q0 to 2Q3 Data Outputs 8 GND Ground (0V) 16 VCC Positive Supply Voltage IEC LOGIC SYMBOLS HC4518 HC4520 M54/M74HC4518/4520 4/13 |
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