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155-0119-00 BCD Counter in DC508A

The Tektronix M123A  (P/N 155-0119-00) is a 5-digit BCD counter and multiplexer monolithic integrated circuit in a 40-pin CERDIP, desigend by Dave Allstot.

It provides a multiplexed BCD output with decoded digit lines from its five internal counter stages plus four latched 4-bit BCD inputs (for the most significant digits i.e. higher frequency divider stages). Maximum clock frequency is 5 MHz.

Used in


Some instruments using part 155-0119-00

Instrument Manufacturer Class Model Description Introduced
DC508A Tektronix Plug-in DC508A 1.3 GHz counter 1980