155-0119-00
The Tektronix M123 (P/N 155-0119-00) is a 9-decade latch, 5-digit BCD counter and multiplexer monolithic integrated circuit in a 40-pin CERDIP, desigend by Dave Allstot.
The M123 is a five-digit BCD counter with the outputs buffered and multiplexed. The maximum input count frequency is 5 MHz and an overflow latch is provided to detect over range counts.
The chip also contains latches for four higher order digits which can be loaded from external counter stages.
All nine digits are multiplexed out serially. Digit strobes are provided in order to easily interface to LED readouts.
The output multiplexer can be set to strobe out only the five least significant digits. An extra strobe is provided as a time slot for points or units. The output of the fourth decade is also brought out.
Used in
Datasheet
Some instruments using part 155-0119-00
| Instrument | Manufacturer | Class | Model | Description | Introduced |
|---|---|---|---|---|---|
| DC508 | Tektronix | Plug-in | DC508 | 1 GHz counter | 1978 |
| DC508A | Tektronix | Plug-in | DC508A | 1.3 GHz counter | 1980 |