155-0090-00
The 155-0090-00 is a Tek-made custom four-decade counter IC.
It contains four 4-bit BCD counters, four 4-bit latches and four BCD-to-analog converters that interface with the 7000 series readout system.
Used in
- 7D01 (U1338)
- 7D15
- 7B85 (U686 before SN B06000), later models use 155-0171-00/155-0185-00