【正文】
QA14QB13QC12QD11RCO15A3B4C5D6ENP7ENT10~LOAD9~CLR1CLK2U274163NQA14QB13QC12QD11RCO15A3B4C5D6ENP7ENT10~LOAD9~CLR1CLK2U474194NA3B4C5D6SL7QA15QB14QC13QD12SR2~CLR1S09S110CLK11U57 4 L S 0 4 N1A1Y2A2Y3A3YGND 4Y4A5Y5A6Y6AVCCU67 4 L S 0 9 N1A1B1Y2A2B2YGND 3Y3A3B4Y4A4BVCCU77 4 L S 3 2 N1A1B1Y2A2B2YGND 3Y3A3B4Y4A4BVCCV C C5VV C C5VG N DG N D2X1 2 . 5 VX2 2 . 5 VX3 2 . 5 VX4 2 . 5 V12131416175G N DG N DU 1 074194NA3B4C5D6SL7QA15QB14QC13QD12SR2~CLR1S09S110CLK11X5 2 . 5 VX6 2 . 5 VX7 2 . 5 VX8 2 . 5 VG N D11102324X9 2 . 5 VX 1 0 2 . 5 V2021U374163NQA14QB13QC12QD11RCO15A3B4C5D6ENP7ENT10~LOAD9~CLR1CLK243V C C15G N D 25229U 8 A7 4 S 1 0 D19678V C CU9L M 5 5 5 C MGND1DIS7OUT3RST4VCC8THR6CON5TRI2C11 0 u FC21 0 n FR1 1kΩR21 7 . 4 k ΩV C C5VG N D2627G N DV C C181 圖 2 四、各單元電路設(shè)計(jì) 1時(shí)鐘脈沖產(chǎn)生電路 用 555定時(shí)器構(gòu)成多諧振蕩器 ,電路輸 出便得到一個(gè)周期