This part is a kind of semiconductor called M5450.

Function of this product has LED DISPLAY DRIVERS.

Manufacturers : ST Microelectronics

Image and pinout :

Some of the text within the PDF file :

M5450 M5451 LED DISPLAY DRIVERS . . . . . . . . . . . . M5450 34 OUTPUTS/15mA SINK M5451 35 OUTPUTS/15mA SINK CURRENT GENERATOR OUTPUTS (NO EXTERNAL RESISTORS REQUIRED) CONTINUOUS BRIGHTNESS CONTROL SERIAL DATA INPUT ENABLE (ON M5450) WIDE SUPPLY VOLTAGE OPERATION TTL COMPATIBILITY A single pin controls the LED display brightness by setting a reference current through a variable resistor connected to VDD or to a separate supply of 13.2V maximum. Application Examples : MICROPROCESSOR DISPLAYS INDUSTRIAL CONTROL INDICATOR RELAY DRIVER INSTRUMENTATION READOUTS DESCRIPTION The M5450 and M5451 are monolithic MOS integrated circuits produced with an N-channel silicon gate technology. They are available in 40-pin dual in-line plastic packages. DIP40 (Plastic Package) ORDER CODE : M5450B7 / M [ ... ]

M5450 PDF Datasheet Download