1. System Complexity and Integration Level The CD4056 is a single-channel BCD-to-7-segment decoder, requiring external multi-digit scanning circuitry and backplane drivers. The ICM7211 integrates a complete scanning driver, data latch, and control for four digits. This distinction means the CD4056 suits distributed or custom multiplexed systems, whereas the ICM7211 is a self-contained multi-digit display solution. Substitution would necessitate a redesign of the control logic and interconnect scheme. 2. Voltage Compatibility and Power Consumption Class The CD4056 supports a wide supply range of 3V to 18V with a quiescent current of 80nA. The ICM7211 operates from 3V to 6V with a quiescent current of 10µA. This indicates the CD4056 targets wide-voltage, ultra-low-power applications (e.g., battery-powered instruments for long-term operation), while the ICM7211 is suited for fixed low-voltage digital systems. Substitution could impact the power supply architecture and operational endurance. 3. Environmental Robustness Grade The CD4056 has an operating temperature range of -55°C to 125°C (industrial/military grade). The ICM7211 is rated for -20°C to 85°C (commercial grade). This difference determines that the CD4056 can be deployed in high/low-temperature and high-reliability scenarios, whereas the ICM7211 may pose reliability risks in harsh environments. 4. Pin Package and Expandability The CD4056 comes in a 16-pin package, providing only basic decoded outputs. The ICM7211 uses a 40-pin package, integrating multi-digit control and an on-chip scanning oscillator. This results in PCB layout incompatibility. Furthermore, the ICM7211 requires adherence to its specific scanning timing, making a full hardware redesign necessary for substitution.