[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-seo-670875-105":3,"detail-sidebar-cat-0-en-105":80,"doc-detail-670875-en":130},{"code":4,"msg":5,"data":6},0,"ok",{"site_id":7,"language":8,"slug":9,"title":10,"keywords":11,"description":12,"schema_data":13,"social_meta":73,"head_meta":75,"extra_data":77,"updated_unix":79},105,"en","icm7555-icm7556-general-purpose-timers-datasheet","ICM7555, ICM7556 - General Purpose Timers - Datasheet","","ICM7555 and ICM7556 are CMOS RC timer ICs designed to provide substantially improved performance over standard SE/NE 555/556 and 355 timers while serving as direct replacements in most applications. They generate accurate time delays and frequencies in monostable (one-shot) and astable (oscillator) modes, with the ICM7556 functioning as a dual version sharing only V+ and GND. Key advantages include low supply and input currents, wide operating supply voltage range, high-speed operation up to 1 MHz, adjustable duty cycle, and TTL/CMOS-capable push-pull output drive with very low offsets, without requiring control-voltage decoupling.",{"@graph":14,"@context":72},[15,34,55],{"@type":16,"itemListElement":17},"BreadcrumbList",[18,23,27,31],{"item":19,"name":20,"@type":21,"position":22},"https://docshare.wps.com","Home","ListItem",1,{"item":24,"name":25,"@type":21,"position":26},"https://docshare.wps.com/document/","Document",2,{"item":28,"name":29,"@type":21,"position":30},"https://docshare.wps.com/document/technology/","Technology",3,{"item":32,"name":10,"@type":21,"position":33},"https://docshare.wps.com/document/icm7555-icm7556-general-purpose-timers-datasheet/670875/",4,{"url":32,"name":10,"@type":35,"image":36,"author":41,"headline":10,"publisher":44,"fileFormat":47,"inLanguage":8,"description":12,"dateModified":48,"datePublished":49,"encodingFormat":47,"isAccessibleForFree":50,"interactionStatistic":51},"DigitalDocument",{"url":37,"@type":38,"width":39,"height":40},"https://docshare.wps.com/thumbnails/icm7555-icm7556-general-purpose-timers-datasheet/670875.png","ImageObject",300,407,{"name":42,"@type":43},"Rowan","Person",{"url":19,"name":45,"@type":46},"DocShare","Organization","application/pdf","2026-11-04","2026-11-01",true,{"@type":52,"interactionType":53,"userInteractionCount":33},"InteractionCounter",{"@type":54},"ViewAction",{"@type":56,"mainEntity":57},"FAQPage",[58,64,68],{"name":59,"@type":60,"acceptedAnswer":61},"What are the main functions of ICM7555 and ICM7556?","Question",{"text":62,"@type":63},"They are stable CMOS RC timer controllers capable of producing accurate time delays and frequencies. ICM7556 is a dual ICM7555 with independent timers sharing only V+ and GND.","Answer",{"name":65,"@type":60,"acceptedAnswer":66},"How do you control timing in one-shot and astable modes?",{"text":67,"@type":63},"In one-shot mode, pulse width is controlled by one external resistor and capacitor. In astable mode, frequency and duty cycle are controlled by two external resistors and one capacitor.",{"name":69,"@type":60,"acceptedAnswer":70},"What performance benefits are highlighted in the features section?",{"text":71,"@type":63},"The document lists low supply current, extremely low input currents (20 pA), high-speed operation up to 1 MHz, a guaranteed supply voltage range of 2 V to 18 V, temperature stability of 0.005%/°C at +25°C, and driver capability for TTL/CMOS loads.","https://schema.org",{"og:url":32,"og:type":74,"og:title":10,"og:site_name":45,"og:description":12},"article",{"robots":76,"canonical":32},"index,follow",{"doc_id":78,"site_id":7},670875,1793572447,{"code":4,"msg":81,"data":82},"success",[83,87,91,95,100,104,109,114,119,122,126],{"id":22,"doc_module":4,"doc_module_name":25,"category_name":84,"show_sort_weight":85,"slug":86},"Story & Novel",90,"story-novel",{"id":26,"doc_module":4,"doc_module_name":25,"category_name":88,"show_sort_weight":89,"slug":90},"Literature",80,"literature",{"id":33,"doc_module":4,"doc_module_name":25,"category_name":92,"show_sort_weight":93,"slug":94},"Exam",70,"exam",{"id":96,"doc_module":4,"doc_module_name":25,"category_name":97,"show_sort_weight":98,"slug":99},5,"Comic",60,"comic",{"id":101,"doc_module":4,"doc_module_name":25,"category_name":29,"show_sort_weight":102,"slug":103},6,50,"technology",{"id":105,"doc_module":4,"doc_module_name":25,"category_name":106,"show_sort_weight":107,"slug":108},7,"Healthcare",40,"healthcare",{"id":110,"doc_module":4,"doc_module_name":25,"category_name":111,"show_sort_weight":112,"slug":113},8,"Research & Report",30,"research-report",{"id":115,"doc_module":4,"doc_module_name":25,"category_name":116,"show_sort_weight":117,"slug":118},9,"Religion & Spirituality",20,"religion-spirituality",{"id":117,"doc_module":4,"doc_module_name":25,"category_name":120,"show_sort_weight":117,"slug":121},"World Cup","world-cup",{"id":123,"doc_module":4,"doc_module_name":25,"category_name":124,"show_sort_weight":123,"slug":125},10,"Lifestyle","lifestyle",{"id":127,"doc_module":4,"doc_module_name":25,"category_name":128,"show_sort_weight":96,"slug":129},19,"General","general",{"code":4,"msg":81,"data":131},{"doc_id":78,"user_id":132,"nickname":42,"user_avatar":133,"doc_module":4,"category_id":101,"category_name":29,"doc_title":10,"doc_description":12,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":33,"is_deleted":4,"is_public":22,"is_downloadable":22,"audit_status":22,"page_count":139,"language":140,"language_code":8,"site_id":7,"html_lang":8,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":12,"update_tm":79,"read_time":144},1099514067415,"https://ap-avatar.wpscdn.com/avatar/100002539d78ffe74a7?x-image-process=image/resize,m_fixed,w_180,h_180&k=1779092875211072502","DATASHEET  \n\n| ICM7555, ICM7556\u003Cbr>General Purpose Timers | FN2867 Rev.10.01 Mar 5, 2020 |\n| --- | --- |\n| The ICM7555 and ICM7556 are CMOS RC timers providing significantly improved performance over the standard\u003Cbr>SE/NE 555/556 and 355 timers, while at the same time being direct replacements for those devices in most applications. Improved parameters include low supply current, wide  operating supply voltage range, low Threshold, Trigger and Reset currents, no crowbarring of the supply current during output transitions, higher frequency performance and no requirement to decouple Control Voltage for stable operation.\u003Cbr>Specifically, the ICM7555 and ICM7556 are stable controllers capable of producing accurate time delays or frequencies. The ICM7556 is a dual ICM7555, with the two timers operating independently of each other, sharing only V+ and GND. In the one shot mode, the pulse width of each circuit is precisely controlled by one external resistor and capacitor. For astable operation as an oscillator, the free running frequency and the duty cycle are both accurately controlled by two external resistors and one capacitor. Unlike the regular bipolar\u003Cbr>SE/NE 555/556 devices, the Control Voltage terminal need not be decoupled with a capacitor. The circuits are triggered and reset on falling (negative) waveforms, and the output inverter can source or sink currents large enough to drive TTL loads, or provide minimal offsets to drive CMOS loads.\u003Cbr>Applications Precision timing Pulse generation Sequential timing Time delay generation Pulse width modulation\u003Cbr>Pulse position modulation Missing pulse detector | Features\u003Cbr>• Exact equivalent in most cases for SE/NE 555/556 or TLC555/556\u003Cbr>• Low supply current\u003Cbr>- ICM7555 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60µA\u003Cbr>- ICM7556 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120µA\u003Cbr>• Extremely low input currents . . . . . . . . . . . . . . . . . . . . . . 20pA\u003Cbr>• High speed operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1MHz\u003Cbr>• Guaranteed supply voltage range . . . . . . . . . . . . . . 2V to 18V\u003Cbr>• Temperature stability . . . . . . . . . . . . . 0.005%/°C at +25°C\u003Cbr>• Normal reset function-no crowbarring of supply during output transition\u003Cbr>• Can be used with higher impedance timing elements than regular 555/556 for longer RC time constants\u003Cbr>• Timing from microseconds through hours\u003Cbr>• Operates in both astable and monostable modes\u003Cbr>• Adjustable duty cycle\u003Cbr>• High output source/sink driver can drive TTL/CMOS\u003Cbr>• Outputs have very low offsets, HIGH and LOW\u003Cbr>• Pb-free (RoHS Compliant) Related Literature\u003Cbr>For a full list of related documents, visit our website:\u003Cbr>• ICM7555 and ICM7556 device pages |\n\nPin Configurations  \nICM7555  \n(8 LD PDIP, SOIC)  \nTOP VIEW  \nICM7556 (14 LD PDIP)  \nTOP VIEW  \nV DD  \nDISCHARGE  \nTHRESHOLD  \nCONTROL VOLTAGE  \nDISCHARGE1  \nTHRESHOLD1  \nCONTROL VOLTAGE1  \nRESET1  \nOUTPUT1  \nTRIGGER1  \nGND  \n\n| 1 |  | 14 |\n| --- | --- | --- |\n|  |  |  |\n| 2 |  | 13 |\n|  |  |  |\n| 3 |  | 12 |\n|  |  |  |\n| 4 |  | 11 |\n|  |  |  |\n| 5 |  | 10 |\n|  |  |  |\n| 6 |  | 9 |\n|  |  |  |\n| 7 |  | 8 |\n|  |  |  |\n\nV DD  \nDISCHARGE2  \nTHRESHOLD2  \nCONTROL VOLTAGE2  \nRESET2  \nOUTPUT2  \nTRIGGER2  \nFN2867 Rev.10.01 Mar 5, 2020  \nPage 1  \nof 13  \nOrdering Information  \n\n| PART NUMBER | PART MARKING | TEMP. RANGE\u003Cbr>(°C) | TAPE AND REEL\u003Cbr>(UNITS) | PACKAGE (RoHS COMPLIANT) | PKG. DWG. \\# |\n| --- | --- | --- | --- | --- | --- |\n| ICM7555CBAZ (Notes 2, 3) | 7555 CBAZ | 0 to +70 |  | 8 Ld SOIC | M8.15 |\n| ICM7555CBAZ-T (Notes 1, 2, 3) | 7555 CBAZ | 0 to +70 | 2.5k | 8 Ld SOIC | M8.15 |\n| ICM7555IBAZ (Notes 2, 3) | 7555 IBAZ | -25 to +85 |  | 8 Ld SOIC | M8.15 |\n| ICM7555IBAZ-T (Notes 1, 2, 3) | 7555 IBAZ | -25 to +85 | 2.5k | 8 Ld SOIC | M8.15 |\n| ICM7555IPAZ (Notes 2, 3) | 7555 IPAZ | -25 to +85 |  | 8 Ld PDIP | E8.3 |\n| ICM7556IPDZ (Notes 2, 3) | ICM7556IPDZ | -25 to +85 |  | 14 Ld PDIP | E14","cbCaifXI06z4mnF6","https://ap.wps.com/l/cbCaifXI06z4mnF6","pdf",725455,13,"English","# Overview\n## Features\n## Applications\n# Pin Configurations\n# Ordering Information\n# Absolute Maximum Ratings\n## Operating Conditions","[{\"question\":\"What are the main functions of ICM7555 and ICM7556?\",\"answer\":\"They are stable CMOS RC timer controllers capable of producing accurate time delays and frequencies. ICM7556 is a dual ICM7555 with independent timers sharing only V+ and GND.\"},{\"question\":\"How do you control timing in one-shot and astable modes?\",\"answer\":\"In one-shot mode, pulse width is controlled by one external resistor and capacitor. In astable mode, frequency and duty cycle are controlled by two external resistors and one capacitor.\"},{\"question\":\"What performance benefits are highlighted in the features section?\",\"answer\":\"The document lists low supply current, extremely low input currents (20 pA), high-speed operation up to 1 MHz, a guaranteed supply voltage range of 2 V to 18 V, temperature stability of 0.005%/°C at +25°C, and driver capability for TTL/CMOS loads.\"}]","ICM7555, ICM7556 - General Purpose Timers - Datasheet | PDF",33]