| Manufacturer | Part # | Datasheet | Description |
 National Semiconductor ... | LMC568 |  161Kb/6P | Low Power Phase-Locked Loop |
| LMC568CM |  161Kb/6P | Low Power Phase-Locked Loop |
 National Semiconductor ... | LMC568CN |  161Kb/6P | Low Power Phase-Locked Loop |
 National Semiconductor ... | LMC567 |  168Kb/ 7P | Low Power Tone Decoder |
| LMC567CM |  168Kb/ 7P | Low Power Tone Decoder |
 National Semiconductor ... | LMC567CN |  168Kb/ 7P | Low Power Tone Decoder |
 National Semiconductor ... | LMC568CM |  161Kb/ 6P | Low Power Phase-Locked Loop |
 National Semiconductor ... | LMC568CN |  161Kb/ 6P | Low Power Phase-Locked Loop |
| LMC555 |  318Kb/ 12P | CMOS Timer |