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When a valid DTMF tone pair enters IN+, the StD pin goes HIGH. The binary output on Q4:Q1 should be:
You need two specific files:
Note: Ignore the "35" suffix. Look for files released by "Team Magnet" or "Proteus Libraries 8.9 pack." mt8870 proteus lib 35
Given that "lib 35" is a ghost from older forums (likely 2015 era), it may be incompatible with modern Windows 10/11 and Proteus 8.9 SP5+. When a valid DTMF tone pair enters IN+,
Option A: Use Arduino Library within Proteus
Instead of hunting for a broken MT8870 model, design the circuit with an Arduino. Use the ArduinoISP or VIRTUAL TERMINAL to simulate decoding. Note: Ignore the "35" suffix
Option B: Build the Logic Gates For academic projects, you can simulate the 8870's truth table using a Lookup Table (LUT) or a 4-to-16 decoder. This proves your concept without the specific library.
Option C: The Working Library Source As of 2025, the most stable MT8870 library is found within the "Proteus 8.9 Complete Library Collection" by Electronics Hub or The Engineering Projects. Search for: "MT8870 Library for Proteus The Engineering Projects" . Their version explicitly supports Proteus 8.9 SP3 and up.
