ICM7217 Preset Counter with 4 Digits

Advertise in delabs

ICM7217 is a four digit, presettable up/down counter with an onboard presettable register continuously compared to the counter. The ICM7217 is intended for use in hard-wired applications where thumbwheel switches are used for loading data, and simple SPDT switches are used for chip control.

Digital Timers, Counters and Clocks has some of my designs using chips like this.

This circuit provides multiplexed 7 segment LED display outputs, with common anode or common cathode configurations available. Digit and segment drivers are provided to directly drive displays of up to 0.8 inch character height (common anode) at a 25% duty cycle. The frequency of the onboard multiplex oscillator may be controlled with a single capacitor, or the oscillator may be allowed to free run. Leading zeros can be blanked. The data appearing at the 7 segment and BCD outputs is latched; the content of the counter is transferred into the latches under external control by means of the Store pin.

See an Application of 7217 as a Preset Counter which is used in Process Control

ICM7217 Preset Counter

Features of Chip

  • Four Decade, Presettable Up-Down Counter with Parallel Zero Detect
  • Settable Register with Contents Continuously Compared to Counter
  • Directly Drives Multiplexed 7 Segment Common Anode or Common Cathode LED Displays
  • On-Board Multiplex Scan Oscillator
  • Schmitt Trigger On Count Input
  • TTL Compatible BCD I/O Port, Carry/Borrow, Equal, and Zero Outputs
  • Display Blank Control for Lower Power Operation; Quiescent Power Dissipation <5mW
  • All Terminals Fully Protected Against Static Discharge
  • Single 5V Supply Operation

delabs Notes-

This is another Intersil Masterpiece in days when using uP was complex and uC was not available.A 8085 could be used but with many supporting chips and it consumed power. This was a CMOS innovation low on power and just one ASIC had the fexibility for many digital operations.A ThumbWheel and Display Interface completed a Gadget.

  • Interactive Power Electronics SeminarInteractive Power Electronics Seminar
    The interactive and animated applets are part of the Introductory Course on Power Electronics taught by Prof. Kolar at the ETH Zurich. Interactive Power Electronics [...]
  • Test and Measurement World
    Covering electronics test, measurement, and inspection. TMWorld.com is a comprehensive website solely dedicated to providing information for engineers involved in electronics test and measurement across [...]
  • Kenneth Wyatt –  EMC design and training servicesKenneth Wyatt – EMC design and training services
    A consulting firm that specializes in EMC design, troubleshooting and training services to commercial and industrial manufacturers with global distribution in the consumer, computer, network [...]
  • Non-Destructive Testing NDT Resource
    Eddy Current Testing (ET) and Infrared/Thermal Testing (IRT) are Interesting Areas where experienced designers can build and manufacture Test Equipment. Community College Education Resource These [...]
  • Design Notes – Components Selection – 05
    Selecting the parts for your product design, choosing the components intelligently is a part of Product Design Engineering. Budget, Availability, Size, Alternate Vendors, Product Life [...]
  • Dilbert Dupey and Talking ParrotsDilbert Dupey and Talking Parrots
    There was the time when Peedy The Talking Parrot made his appearance on my Win 95 Desktop. It was the first version of BonziBuddy. This [...]
  • Relays and ContactorsRelays and Contactors
    Contactors are used to switch Mains voltage. even three phase power to Motors, Heaters and other Actuating Elements of Industrial, Home or Energy Automation. The [...]
  • SWTPC Computer Documentation Repository
    SWTPC Computer Documentation Repository This site’s purpose is to address the lack of technical information for some of the rarer vintage computers and related peripherals, [...]
About delabs 419 Articles
delabs is a web-service for product design and development.