MAX7221CNG+

Display Drivers Overview

The MAX7221CNG+ is a serially interfaced, 8-digit LED display driver manufactured by Analog Devices Inc./Maxim Integrated. It interfaces microprocessors to common-cathode displays via SPI, QSPI, or Microwire. Key electrical parameters include a supply voltage range of 4 V to 5.5 V and a maximum power dissipation of 941 mW. The device features high-level output current of -45 mA and low-level output current of 320 mA. It operates within a temperature range of 0°C to +70°C and is housed in a 24-pin DIP package.

Display Drivers Feature Summary

• Supports SPI, QSPI, and Microwire serial interfaces for processor connectivity
• Includes on-chip BCD decoder, multiplex scan circuitry, and 8x8 static RAM
• Features slew-rate limited segment drivers to reduce electromagnetic interference
• Provides digital and analog brightness control with low-power shutdown mode

Display Drivers Applications

• Bar-graph displays
• 7-segment numeric LED displays
• Industrial controllers
• Panel meters
• LED matrix displays

Display Drivers Procurement Notes

Verify the specific suffix 'CNG+' against the manufacturer's official datasheet to confirm the package type and RoHS compliance status. Ensure the component source is an authorized distributor to guarantee authenticity. Check for any recent product change notices that may affect pinout or electrical characteristics before finalizing procurement.

Display Drivers Selection Notes

Select this component when EMI reduction is critical due to its slew-rate limited drivers. It is suitable for applications requiring direct interface with microcontrollers using standard serial protocols. Consider the 24-pin DIP package for through-hole mounting requirements. Verify that the required number of digits does not exceed eight.

Display Drivers Part Context

The MAX7221 is part of the Maxim Integrated LED display driver family, designed as a compact solution for driving common-cathode LED displays. It integrates necessary decoding and scanning functions, reducing external component count compared to discrete solutions. The CNG+ designation indicates a lead-free, RoHS-compliant version in a 24-pin DIP package.

Display Drivers Replacement Considerations

The MAX7219 is a compatible alternative within the same family but lacks the slew-rate limited drivers and specific serial interface compatibility of the MAX7221. Verify interface protocol support and EMI requirements when substituting.