Fairchild μL923
The Fairchild μL923 (P/N 156-0012-00) is an RTL J-K flip-flop monolithic integrated circuit in an epoxy package similar to a TO-5.
Some instruments using part Fairchild μL923
| Instrument | Manufacturer | Class | Description | Introduced |
|---|---|---|---|---|
| 067-0572-01 | Tektronix | Plug-in | Normalizer Head | (?) |
| 140 | Tektronix | Audio/Video | NTSC signal generator | 1969 |
| 141 | Tektronix | Audio/Video | PAL signal generator | 1969 |
| 142 | Tektronix | Audio/Video | PAL TV Signal Generator | 1970 |
| 144 | Tektronix | Audio/Video | NTSC signal generator | 1971 |
| 145 | Tektronix | Audio/Video | PAL genlock test signal generator | 1973 |
| 146 | Tektronix | Audio/Video | NTSC signal generator | 1971 |
| 230 | Tektronix | Test Automation | Digital Unit | 1967 |
| 520 | Tektronix | Audio/Video | NTSC/PAL vectorscope | 1967 |
Links
- Fairchild μL923 Datasheet
- Integrated Circuits: What's Available?. Donald E. Lancaster, Electronics World November 1965, p.47
Another interesting counting flip-flop is the Fairchild µL923. This low-cost J-K bistable is in an eight-pin TO-5 epoxy package, contains 15 transistors and 17 resistors, and will count at a 1-mc. rate.
A single +3.6-volt supply is needed. This unit is intended for industrial shift-register and binary counting applications.
- Using New Low-Cost Integrated Circuits. Donald E. Lancaster, Electronics World November 1966, p.50
Fanciest of the three integrateds is the µL923 – at about $4.00[1] – a full-counting flip-flop. The IC is the equivalent of fifteen transistors and seventeen resistors. It singlehandedly counts by two, automatically steering its own input to the proper side every count, even at push-button speeds. This IC is also useful as a shift register or memory element and replaces some complicated binary and ring-counter circuitry.
Note
- ↑ $4 in 1966 is equivalent to about $40 in 2025.
