MAX7221:Serially Interfaced, 8-Digit, LED Display Drivers

The MAX7219/MAX7221 are compact, serial input/output common-cathode display drivers that interface microprocessors (µPs) to 7-segment numeric LED displays of up to 8 digits, bar-graph displays, or 64 individual LEDs. Included on-chip are a BCD code-B decoder, multiplex scan circuitry, segment and digit drivers, and an 8x8 static RAM that stores each digit. Only one external resistor is required to set the segment current for all LEDs. The MAX7221 is compatible with SPI™, QSPI™, and MICROWIRE™, and has slew-rate-limited segment drivers to reduce EMI. A convenient 4-wire serial interface connects to all common µPs. Individual digits may be addressed and updated without rewriting the entire display. The MAX7219/MAX7221 also allow the user to select code-B decoding or no-decode for each digit. The devices include a 150µA low-power shutdown mode, analog and digital brightness control, a scan-limit register that allows the user to display from 1 to 8 digits, and a test mode that forces all LEDs on. For applications requiring 3V operation or segment blinking, refer to the MAX6951 data sheet.

Key Features
  • 10MHz Serial Interface
  • Individual LED Segment Control
  • Decode/No-Decode Digit Selection
  • 150µA Low-Power Shutdown (Data Retained)
  • Digital and Analog Brightness Control
  • Display Blanked on Power-Up
  • Drive Common-Cathode LED Display
  • Slew-Rate Limited Segment Drivers for Lower EMI (MAX7221)
  • SPI, QSPI, MICROWIRE Serial Interface (MAX7221)
  • 24-Pin DIP and SO Packages
MAX7219, MAX7221: Typical Application Circuit
MAX7219, MAX7221: Typical Application Circuit
  • Bar Graph Displays
  • Industrial Controllers
  • LED Matrix Displays
  • Panel Meters
titleDownload file
MAX7219-MAX7221 Data SheetMAX7219-MAX7221.pdf
Part NumberLCD or LEDDigits or Char.Output FormatDisplay TypeInterfaceFontsVSUPPLY
minmaxSee Notes
MAX7219LED8-Digit7 segment + DPCommon CathodeSerial 3-Wire 10MbitCode B45.5CDIP(N)/24
$5.38 @1k
MAX7221Serial SPI 10MbitCDIP(N)/24
$5.54 @1k
Quality and Environmental Data
Related Products
  • MAX6958:2-Wire Interfaced, 3V to 5.5V, 4-Digit, 9-Segment LED Display Drivers with Keyscan
  • MAX6959:2-Wire Interfaced, 3V to 5.5V, 4-Digit, 9-Segment LED Display Drivers with Keyscan
  • MAX6955:2-Wire Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan
  • MAX6956:2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port LED Display Driver and I/O Expander
  • MAX6954:4-Wire Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan
  • MAX6952:4-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 x 7 Matrix LED Display Driver
  • MAX6957:4-Wire-Interfaced, 2.5V to 5.5V, 20-Port and 28-Port LED Display Driver and I/O Expander
  • MAX6953:2-Wire Interfaced, 2.7V to 5.5V, 4-Digit 5 x 7 Matrix LED Display Driver
  • MAX6950:Serially Interfaced, +2.7V to +5.5V, 5- and 8-Digit LED Display Drivers
  • MAX6951:Serially Interfaced, +2.7V to +5.5V, 5- and 8-Digit LED Display Drivers
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX7221CNGNo Longer AvailableMAX7221CNG+PDIP(N),;24 pin;158.4 mm²0°C to +70°CNo
MAX7221CNG+ActivePDIP(N),;24 pin;158.4 mm²0°C to +70°CLead Free
MAX7221CWGNo Longer AvailableMAX7221CWG+SOIC(W),;24 pin;166.1 mm²0°C to +70°CNo
MAX7221CWG+ActiveSOIC(W),;24 pin;166.1 mm²0°C to +70°CLead Free
MAX7221CWG+TActiveSOIC(W),;24 pin;166.1 mm²0°C to +70°CLead Free
MAX7221CWG-TNo Longer AvailableMAX7221CWG+TW.SO;24 pin0°C to +70°CSee data sheet
MAX7221ENGNo Longer AvailableMAX7221ENG+PDIP(N),;24 pin;158.4 mm²-40°C to +85°CNo
MAX7221ENG+ActivePDIP(N),;24 pin;158.4 mm²-40°C to +85°CLead Free
MAX7221ERGNo Longer AvailableCDIP(N),;24 pin;264.3 mm²-40°C to +85°CNo
MAX7221EWGNo Longer AvailableMAX7221EWG+SOIC(W),;24 pin;166.1 mm²-40°C to +85°CNo
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX7221EWG+ActiveSOIC(W),;24 pin;166.1 mm²-40°C to +85°CLead Free
MAX7221EWG+TActiveSOIC(W),;24 pin;166.1 mm²-40°C to +85°CLead Free
MAX7221EWG-TNo Longer AvailableMAX7221EWG+TW.SO;24 pin-40°C to +85°CSee data sheet
MAX7219-MAX7221.pdf MAX7221
MAX7219-MAX7221_cn.pdf MAX7221
One-Wire Network Controls Remote SPI Peripherals DS2413
Using a PC to Experiment with the MAX7219 and MAX7221 LED Display Drivers MAX7221
LEDs Are Still Popular (and Improving) after All These Years MAX6966
Using Maxim SPI-compatible Display Drivers with other SPI Peripherals MAX7317
Using the MAX7219/7221 to Drive Higher Voltage or Current MAX7221
Electronic Displays Comparison MAX6966
Multiplexing Shutdown Allows Text to be Displayed MAX7221
12-Bit Thermometer Using an 8-Bit µC and Assembler MAX7221
Migrating from the MAX7219 and MAX7221 to the MAX6950 and MAX6951 LED Drivers MAX7221
Data Multiplexer Adds Cursor To MAX7219 or MAX7221 LED 7 Segment Display Driver MAX7221
MAX7221.pdf MAX7221