Category. Description, Digital Alarm Clock. Company, Sanyo Semiconductor Corporation. Datasheet, Download LM datasheet. Quote. Find where to buy. LM datasheet, LM circuit, LM data sheet: SANYO – Digital Alarm Clock,alldatasheet, datasheet, Datasheet search site for Electronic Components . datasheet search, datasheets, Datasheet search site for Electronic Components and LM Datasheet(PDF) 5 Page – Sanyo Semicon Device.

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It shouldn’t be too hard to use normal leds instead of a display.

The chip can drive the LED display directly. Newer Post Older Post Home. I played around with it a dstasheet more and it finally started keeping time again. Ready board The next step was to solder all the parts and find a cable to connect the screen.

lm datasheet & applicatoin notes – Datasheet Archive

After replacing the bulb and socket, the clock would not advance the time. That lasted a few days until the error code came back.

Info on the code is no longer available. The model number of the clock is So when half of the display is on, the other half is off.

(PDF) LM8560 Datasheet download

You can also go with a 2 x 7. This will prevent oxidation of the copper.


If you have one of those clock radios from back in the day, it most likely uses a variant of this chip or maybe a Chinese knock-off. Fortunately there’s a simple fix available. The clock will need mains voltage for operation, battery operation is not supported see pt.

In case you want to build the project and you can’t source a suitable common cathode duplex display, here’s the electrical schematic of one that’s tested to work: The maximum input voltage for the chip is V so make sure to use a suitable transformer. I reset the clock and it appeared to have cured itself.

LM Datasheet pdf – Digital Alarm Clock – SANYO

The power supplied for each of the display segments is 18 mA. Datxsheet it’s old, really old. DrinkTea July 15, at And as a plus, you can make it as big as you wish as long as the the power consumption is held within the chip limits.

This is not much of a problem today, but back in the day especially in eastern Europethe mains had probably around Hz so electronics engineers either avoided using this IC or made separate oscillator blocks with quartz crystals search for 50 Hz timebase circuit.

I have a small lamp plugged into the same circuit. A few days later, it started to lose time, but kept running. Etching the board After thorough cleaning, I used a small piece of expended desoldering braid to cover the traces with solder.


Thanks for your story and all the detail. The chip needs a center tapped transformer for multiplexing the display and also for keeping the time. Posted by Alex at You can leave pin 26 disconnected for catasheet Hz, or leave ln8560 grounded to use it at 50 Hz with care, as ground is VSS here.

It’s best to keep the power consumption to a minimum, especially if discrete LEDs are used for the display for details consult the datasheet available here: I decided it was best to let it go, as the IC chip was most likely damaged. I was lucky to find one in one of the scrap boxes. Each of those resistors is responsible for limiting the current on the 2 cathodes.

Digital Alarm Clock

The only difficult part was finding a suitable display duplex LED, model S. This lm5860 is repeated fast enough that our eyes see the complete image.

The schematic Since I was in need of a easy to read clock, I decided to make one with this chip.