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Eight-digit serial LED driver

MAX7219 Internal Circuitry

Explore the internal circuitry and functional stages of MAX7219.

Package view

Inside MAX7219

Serial storage, scan control and current drivers inside the IC.

Compact MAX7219 cutaway with shift register, address decoder, 8 by 8 RAM, Code B bypass, PWM, scan engine and LED drivers.
Original functional illustration, not a transistor-level die schematic.

Explore the circuit

Select a stage to see its role and connections

Receive and latch

CLK shifts the command; LOAD selects the destination register.

Store and decode

Each digit has a RAM byte; Code B can be enabled individually.

Drive the display

RSET controls peak segment current; scanning selects digit cathodes.

Component view