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MT8870DN from MT

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MT8870DN

Manufacturer: MT, ZARLINK

ISO2-CMOS Integrated DTMF Receiver

Partnumber Manufacturer Quantity Availability
MT8870DN MT, ZARLINK 96 In Stock

Description and Introduction

ISO2-CMOS Integrated DTMF Receiver The **MT8870DN** is a widely recognized integrated circuit (IC) designed for decoding Dual-Tone Multi-Frequency (DTMF) signals. Commonly used in telecommunications and control systems, this component efficiently converts the tone pairs generated by telephone keypads into corresponding 4-bit binary codes. Its reliable performance and ease of integration make it a popular choice for applications such as call routing, remote control systems, and automated telephone services.  

Featuring an internal band-split filter and digital decoder, the MT8870DN accurately distinguishes between the high and low-frequency tones of DTMF signals while rejecting extraneous noise. The IC operates within standard voltage ranges, typically between 5V and 12V, ensuring compatibility with various circuit designs. Additionally, it provides a built-in oscillator, eliminating the need for external timing components in many configurations.  

Key functionalities include a **latched output mode**, which holds the decoded data until a new valid tone is detected, and a **strobe output** that signals successful decoding. These features enhance the IC's usability in sequential logic and microcontroller-based systems.  

Engineers and designers favor the MT8870DN for its robustness, low power consumption, and straightforward implementation. Whether used in legacy telephony equipment or modern embedded systems, this IC remains a dependable solution for DTMF signal processing. Its datasheet provides detailed specifications for optimal circuit integration, ensuring reliable operation across diverse applications.

Application Scenarios & Design Considerations

ISO2-CMOS Integrated DTMF Receiver

Alternative Part Number

  • CM8870CPE --: Pin-compatible DTMF receiver from CML Microcircuits, the original designer of the 8870 family; direct functional drop-in replacement in DIP package.
  • HT9170D --: Widely used DTMF decoder with similar function and DIP-18 footprint; common low-cost alternative to the MT8870 with comparable interface.
  • KT3170 --: Second-source DTMF receiver equivalent to the 8870 series, offering similar pinout and performance for tone decoding applications.

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