| 1228721 | MX623P | Line-powered call progress tone detector | MXCOM |
| 1228722 | MX629 | DELTA MODULATION CODEC meets Mil-Std-188-113 | MXCOM |
| 1228723 | MX629J | DELTA MODULATION CODEC meets Mil-Std-188-113 | CML |
| 1228724 | MX629J | Delta modulation codec meets mil-std-113 | MXCOM |
| 1228725 | MX629LH | Delta modulation codec meets mil-std-113 | MXCOM |
| 1228726 | MX629P | Delta modulation codec meets mil-std-113 | MXCOM |
| 1228727 | MX631 | LOW VOLTAGE SPM DETECTOR | CML |
| 1228728 | MX631DW | LOW VOLTAGE SPM DETECTOR | CML |
| 1228729 | MX631P | LOW VOLTAGE SPM DETECTOR | CML |
| 1228730 | MX633 | Noise Immunity Circuit for the MX633/MX643 Call Progress Detectors | CONSUMER MICROCIRCUITS LIMITED |
| 1228731 | MX633 | Call Progress Tone Detector | MXCOM |
| 1228732 | MX633DW | Call progress tone detector | MXCOM |
| 1228733 | MX633P | CALL PROCRESS TONE DETECTOR | Microsemi |
| 1228734 | MX633P | Call progress tone detector | MXCOM |
| 1228735 | MX636 | True RMS-to-DC Converters | MAXIM - Dallas Semiconductor |
| 1228736 | MX636JC/D | True RMS-to-DC Converters | MAXIM - Dallas Semiconductor |
| 1228737 | MX636JCWE | True RMS-to-DC Converters | MAXIM - Dallas Semiconductor |
| 1228738 | MX636JCWE+ | True RMS-to-DC Converters | MAXIM - Dallas Semiconductor |
| 1228739 | MX636JCWE+T | True RMS-to-DC Converters | MAXIM - Dallas Semiconductor |
|
| 1228740 | MX636JD | True RMS-to-DC Converters | MAXIM - Dallas Semiconductor |
| 1228741 | MX636JH | True RMS-to-DC Converters | MAXIM - Dallas Semiconductor |
| 1228742 | MX636JN | True RMS-to-DC Converters | MAXIM - Dallas Semiconductor |
| 1228743 | MX636JQ | True RMS-to-DC converter. 1MHz bandwidth for Vrms > 100mV. Auxiliary dB output: 50dB range. Low power: 0.8mA(typ). | MAXIM - Dallas Semiconductor |
| 1228744 | MX636KCWE | True RMS-to-DC Converters | MAXIM - Dallas Semiconductor |
| 1228745 | MX636KD | True RMS-to-DC Converters | MAXIM - Dallas Semiconductor |
| 1228746 | MX636KH | True RMS-to-DC Converters | MAXIM - Dallas Semiconductor |
| 1228747 | MX636KN | True RMS-to-DC Converters | MAXIM - Dallas Semiconductor |
| 1228748 | MX636KQ | True RMS-to-DC converter. 1MHz bandwidth for Vrms > 100mV. Auxiliary dB output: 50dB range. Low power: 0.8mA(typ). | MAXIM - Dallas Semiconductor |
| 1228749 | MX641 | Dual SPM (Subscriber Pulse Metering) Detector | CONSUMER MICROCIRCUITS LIMITED |
| 1228750 | MX641 | Dual SPM Detector | MXCOM |
| 1228751 | MX641DW | Dual SPM detector | MXCOM |
| 1228752 | MX641P | Dual SPM detector | MXCOM |
| 1228753 | MX643 | Noise Immunity Circuit for the MX633/MX643 Call Progress Detectors | CONSUMER MICROCIRCUITS LIMITED |
| 1228754 | MX643 | Call Progress Tone Detector | MXCOM |
| 1228755 | MX643DW | Call Progress Tone Detector wlth Special Information Tones(SIT) | CML |
| 1228756 | MX643DW | Call progress tone detector with special information tones (SIT) | MXCOM |
| 1228757 | MX643P | Call Progress Tone Detector wlth Special Information Tones(SIT) | CML |
| 1228758 | MX643P | Call progress tone detector with special information tones (SIT) | MXCOM |
| 1228759 | MX651 | Telephone Subscriber Pulse Metering & Anti Fraud Tone Processor | MXCOM |
| 1228760 | MX651DW | Telephone subscriber pulse metering & anti fraud tone processor | MXCOM |
