![]() ![]() The MT3x71B, with preset internal guard times, uses a delay steering (DStD) logic output to indicate the detection of a valid DTMF digit. The MT3x70B provides an early steering (ESt) logic output to indicate the detection of a DTMF signal and requires external software guard time to validate the DTMF digit. Ordering Information MT3170/71BE 8 Pin Plastic DIP MT3270/71BE 8 Pin Plastic DIP MT3370/71BS 18 Pin SOIC MT3370/71BN 20 Pin SSOP +85 C signalling. ![]() Wide dynamic range (50dB) DTMF Receiver Call progress (CP) detection via cadence indication 4-bit synchronous serial data output Software controlled guard time for MT3x70B Internal guard time circuitry for MT3x71B Powerdown option MT337xB) 4.194304MHz crystal or ceramic resonator (MT337xB and MT327xB) External clock input (MT317xB) Guarantees non-detection of spurious tones
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