Renesas ICM7218AIJI

Overview

ICM7218AIJI from Intersil is a microprocessor-compatible 8-digit LED display decoder/driver IC with common anode output configuration, integrated 8-byte static RAM, hexadecimal/Code B decoding, and shutdown mode. It operates from a single 5V supply, supports inter-digit blanking, delivers up to 200mA digit drive current, and functions across –40°C to +85°C for industrial panel meters and instrumentation displays.

For engineers reviewing the ICM7218AIJI datasheet, ICM7218AIJI pinout, ICM7218AIJI application, or ICM7218AIJI equivalent, this device serves as a self-contained multiplexed LED interface requiring no external segment drivers, clock generation, or memory - ideal for space-constrained microcontroller-based display systems where deterministic timing, low-power shutdown, and direct segment/digit control are critical.

Technical Context

The ICM7218AIJI implements sequential addressing via two control lines (WRITE and MODE): MODE high loads 4-bit control words (DECODE, HEXA/CODE B, SHUTDOWN, DATA COMING), while MODE low enables 8-bit data writes to internal RAM on each WRITE pulse. Its on-chip multiplex oscillator runs at ~250Hz per digit, with 10µs inter-digit blanking to prevent ghosting.

It integrates dual 7-segment decoders (Hexadecimal and Code B), digit/segment drivers with 20kΩ pull-up resistors for common anode operation, and retains display data down to 2V supply during shutdown - all in a single 28-lead CERDIP package without external components for basic operation.

Key Specifications

Pinout & Package

ICM7218AIJI is housed in a 28-lead Ceramic Dual-In-Line Package (CERDIP) with frit seal, RoHS-compliant matte tin termination (e3), and thermal resistance θ_JA = 55°C/W. Pin 1 is identified by a notch; package conforms to MIL-STD-1835 GDIP1-T28 (F28.6).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ICM7218BIJI, the ICM7218AIJI enables direct use with common-anode displays without level-shifting circuitry; versus MAX7219CNG, it offers simpler parallel interfacing and deterministic write timing but lacks serial configurability and intensity scaling.

Availability

ICM7218AIJI is available at Aetrix Electronics and suitable for industrial panel meters, test equipment displays, embedded instrumentation, and legacy control system upgrades requiring stable component supply, long-lifecycle support, and hermetic packaging for reliability-critical applications.

Supply support for ICM7218AIJI 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 provider of precision analog and power management ICs, now part of Renesas Electronics, with expertise in high-reliability industrial and infrastructure solutions.

The ICM7218 product line was designed for microprocessor-based LED display interfacing in industrial instrumentation, offering integrated memory, decoding, and driver capability in a single hermetic package.

FAQ

What display configurations does the ICM7218AIJI support?

The ICM7218AIJI supports common anode 7-segment LED displays with decimal point. It drives eight digits using multiplexed scanning at ~250Hz per digit and provides both Hexadecimal (0–9, A–F) and Code B (–, blank, H, L, P) decoding. The ICM7218AIJI does not support common cathode displays - that function is implemented in the ICM7218BIJI variant.

How does the ICM7218AIJI handle display memory and data loading?

The ICM7218AIJI contains 8 bytes of static RAM to store digit data. Data is loaded sequentially: first a control word (via MODE=high and WRITE pulse) configures decode/shutdown mode, then eight successive WRITE pulses (with MODE=low) fill all 8 memory locations. Once full, further WRITE pulses are ignored until a new control word is issued - ensuring deterministic, non-overrun memory updates.

Can the ICM7218AIJI operate below 5V, and what happens in shutdown mode?

Yes - the ICM7218AIJI operates from 4V to 6V normally, and retains display memory down to 2V in shutdown mode. In shutdown (ID4=low), the multiplex oscillator stops, digit/segment drivers disable, and supply current drops to ~10µA. Data remains intact, and the device resumes display immediately upon exit from shutdown, making it suitable for battery-backed or low-power standby applications.

What is the purpose of the DATA COMING (ID7) signal on the ICM7218AIJI?

ID7 (DATA COMING) signals whether valid display data is present on ID0–ID3 before a WRITE pulse. When ID7=high, the next WRITE pulse (with MODE=low) loads the 4-bit nibble into the current memory location. This handshake prevents spurious writes and enables synchronized data transfer from microcontrollers with variable bus timing - a key reliability feature in noise-prone industrial environments.

Does the ICM7218AIJI require external passive components for basic operation?

Yes - a 0.1µF ceramic capacitor plus a 47µF electrolytic capacitor between VDD and VSS is recommended to suppress multiplex-induced supply noise. No external clock, resistors, or transistors are required for core functionality, as the ICM7218AIJI integrates the oscillator, memory, decoders, and drivers. Pull-up/down resistors are unnecessary due to built-in three-level input biasing on relevant control pins.