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I think the chip will be a programmed microcontroller. You could achive the same thing using a PIC16F628 or an Atmel ATtiny2313. You would buy a blank chip and write the code to perform the counting function and display. This is an example of a tachometer function achived in this way.
I am looking for data on the chip to see if it could be used as a down counter too.
All the PIC counter schematics I have seen have current limiting resistors for the display and I am thinking this chip has a built in driver.
In 1976 I designed a down counter and large LED display using an LED calculator and preset to any number then -1 and counted using the equal sign contacts with an external switch.
If using a 3V supply then no current limiting R is needed with suitable drop on dtiver transistor saturation and RdsOn of 50R of CMOS driver on a PIC.
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