Renesas ICM7218DIJI

Overview

ICM7218DIJI from Intersil is a common-cathode 8-digit LED multiplexed display decoder driver IC with on-chip 8-byte static RAM, hexadecimal/Code B decoding, and integrated digit/segment drivers. It operates from a single 5V supply, supports inter-digit blanking, and features shutdown mode with 2V data retention. Used in microprocessor-based digital instrumentation displays requiring direct LED drive without external transistors.

For engineers reviewing the ICM7218DIJI datasheet, ICM7218DIJI pinout, ICM7218DIJI application, or ICM7218DIJI equivalent, this page delivers verified functional identity, validated pin-level circuit roles, confirmed timing and drive specifications, and real-world use context for embedded display interface design.

Technical Context

The ICM7218DIJI implements random-access write architecture using three-digit address lines (DA0–DA2) and a three-level HEXA/CODE B/SHUTDOWN input (Pin 9), enabling individual digit updates without refreshing all eight positions. Its internal multiplex oscillator runs at ~250Hz per digit, with 10µs inter-digit blanking to prevent ghosting.

It integrates dual-mode 7-segment decoding (Hexadecimal for alphanumeric + numeric, Code B for leading-zero blanking and symbols), decimal point control per digit, and high-current segment drivers (40mA peak) with common-cathode digit outputs rated for 100mA typical drive at VSS +1.0V.

Key Specifications

Pinout & Package

ICM7218DIJI uses a 28-lead Ceramic Dual-In-Line Package (CERDIP) with frit seal, RoHS-compliant matte tin termination (e3), and -40°C to +85°C operating range. Package drawing F28.6 defines mechanical dimensions including 0.100" lead pitch and 1.490" body length.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-digit LED display driver applications.

Compared with ICM7218CIJI, ICM7218DIJI enables direct drive of common-cathode displays without level-shifting, while versus MAX7219CNG it offers faster parallel updates and guaranteed data retention below 4V - critical for brown-out resilience in industrial controllers.

Availability

ICM7218DIJI is available at Aetrix Electronics and suitable for industrial panel meters, test equipment displays, and embedded HVAC controllers requiring stable component supply across long product lifecycles.

Supply support for ICM7218DIJI includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Intersil Corporation is a precision analog and power management semiconductor provider, now part of Renesas Electronics, with legacy expertise in display interface, timing, and high-reliability mixed-signal ICs.

The ICM7218 series was designed specifically for microprocessor-to-LED-display interfacing, integrating memory, decoding, multiplexing, and drive circuitry to replace multi-chip display subsystems in industrial and instrumentation applications.

FAQ

What display configurations does the ICM7218DIJI support?

The ICM7218DIJI supports common-cathode 7-segment LED displays with decimal point per digit. It drives 8 digits using digit sink outputs (DIGIT1–DIGIT8) and segment source outputs (SEG a–g, D.P.). It does not support common-anode displays - for those, ICM7218CIJI must be used. Both Hexadecimal and Code B decoding modes are available, and the device retains display data down to 2V in shutdown mode.

How does the ICM7218DIJI handle digit addressing and data loading?

The ICM7218DIJI uses three address inputs (DA0–DA2) to select one of eight digit positions, and a 4-bit data bus (ID0–ID3 plus ID7 for decimal point) to load segment data. A low-going WRITE pulse latches the data into the selected digit's memory location. This random-access method allows updating a single digit without affecting others - unlike sequential-write variants such as ICM7218BIJI - making it ideal for dynamic partial-display updates.

What is the function of Pin 9 (HEXA/CODE B/SHUTDOWN) on the ICM7218DIJI?

Pin 9 on the ICM7218DIJI is a three-level input: pulled high enables Hexadecimal decoding, left floating selects Code B decoding (via internal bias resistors), and driven low activates shutdown mode - disabling the oscillator, digit/segment drivers, and display output while preserving RAM contents. This single-pin multifunction control reduces required MCU I/O lines and simplifies interface logic compared to separate decode and shutdown pins.

Does the ICM7218DIJI require external components for stable operation?

Yes, the ICM7218DIJI requires two bypass capacitors between VDD and VSS: a 0.1µF ceramic capacitor for high-frequency noise suppression and a 47µF electrolytic capacitor for bulk charge storage to handle multiplexed current surges. These are explicitly recommended in the datasheet to prevent display flicker or segment dropout caused by supply rail sag during digit scanning transitions.

Can the ICM7218DIJI drive high-brightness or high-current LED displays?

The ICM7218DIJI provides 100mA typical digit sink current (common cathode) and 40mA peak segment source current. For higher average brightness, multiple digit outputs can be paralleled - e.g., pairing DIGIT1/DIGIT2 to drive a single digit at ~200mA. However, thermal limits apply: power dissipation reaches ~900mW with all segments lit, so adequate PCB copper area or airflow is required. It is not intended for direct drive of >200mA-per-digit displays without external buffering.