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The Tektronix M059  (P/N 155-0090-00, 155-0090-01, 155-0090-02) is a four-decade counter, latch and D/A converter monolithic integrated circuit designed by Mike Metcalf in 1974.

It contains four 4-bit BCD counters, four 4-bit latches and four BCD-to-analog converters producing a 10-level output current to interface directly with the 7000 series readout system.

Used in

Some instruments using part 155-0090-00

Instrument Manufacturer Class Model Description Introduced
7B85 Tektronix Plug-in 7B85 400 MHz delaying timebase 1976
7D01 Tektronix Plug-in 7D01 16-ch Logic Analyzer 1976
7D12 Tektronix Plug-in 7D12 digital meter plugin 1974
7D15 Tektronix Plug-in 7D15 225 MHz frequency counter 1972
7J20 Tektronix Plug-in 7J20 Optical Spectrometer 1975