MT8880CS1 Microchip Integrated Circuit (Small Outline Packages) In Stock
Microchip MT8880CS1 is a complete DTMF transceiver integrating both tone generation and detection in a single telecom interface IC. It encodes and decodes all 16 DTMF tone pairs defined by ITU-T Q.23 with a 3.58 MHz crystal reference. Housed in a 20-pin SOIC package for compact telephone and modem interface designs.
- Manufacturer
- Microchip
- Package
- Small Outline Packages
- Pin Count
- 20
- Lifecycle
- END OF LIFE
- Datasheet
- MT8880CS1 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Complete DTMF encode and decode in one chip, covering all 16 tone pairs per ITU-T Q.23 without external filters
- 3.58 MHz crystal reference enabling accurate tone frequency generation within ±1.5% of ITU specification
- Bandpass filter and digital counting decoder architecture rejecting voice and noise outside DTMF frequency bands
- 20-pin SOIC package simplifying PCB layout with single-chip telecom interface versus discrete filter solutions
- Low-power CMOS design suitable for battery-backed and line-powered telephone equipment
Applications
The MT8880CS1 is used in telephone autodialers, PSTN modems, alarm system communicators, and interactive voice response (IVR) terminals requiring reliable DTMF tone generation and detection. It enables microcontroller-based systems to send and receive DTMF signaling over standard 2-wire telephone lines without external bandpass filters or DSP processing. The 20-pin SOIC package fits compactly on telecom adapter boards and embedded communication modules.
Specifications
| Reach Compliance Code | Compliant |
| JESD-30 Code | R-PDSO-G20 |
| JESD-609 Code | e3 |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP20,.4 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Supply Current-Max | 0.01mA |
| Supply Voltage-Nom | 5V |
| Surface Mount | YES |
| Technology | CMOS |
| Telecom IC Type | DTMF SIGNALING CIRCUIT |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | MATTE TIN |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 3 |
| ECCN | EAR99 |
| HTS Code | 8542.31.00.01 |
| Country of Origin | Mainland China |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How many DTMF tone pairs does the MT8880CS1 support and does it cover the full ITU-T Q.23 set?
The MT8880CS1 encodes and decodes all 16 DTMF tone pairs defined by ITU-T Q.23, including the standard 12 telephone keypad tones (0–9, *, #) plus the 4 extended A, B, C, D tones used in military and specialized telecom equipment. The 3.58 MHz crystal reference keeps generated frequencies within ±1.5% of the specified row and column frequencies.
What crystal frequency does the MT8880CS1 require and why is 3.58 MHz used instead of other references?
The MT8880CS1 uses a 3.58 MHz crystal, the same frequency as the NTSC color burst oscillator, because this value is widely available at low cost and divides accurately to produce all 8 DTMF frequencies between 697 Hz and 1633 Hz. Using a standard television crystal reduces BOM cost versus a custom-frequency resonator while maintaining ITU-compliant tone generation accuracy.
How does the MT8880CS1 filter voice signals to prevent false DTMF detections in telephone line applications?
The MT8880CS1 uses a bandpass digital counting decoder that only responds to dual-tone signals where both a row frequency (697–941 Hz) and a column frequency (1209–1633 Hz) are present simultaneously for a minimum of 40 ms. Speech energy, single-tone signals, and noise are rejected because they do not satisfy the dual-tone duration and frequency window criteria defined in the ITU-T specification.
What is the lead time for MT8880CS1 and what does a YTEOL of 0 mean for long-term procurement?
Microchip lists a 3-week factory lead time for MT8880CS1, but the YTEOL (Years To End Of Life) value of 0 indicates this product is at or near end-of-life status. Procurement teams should immediately assess alternative DTMF transceivers such as the MT8888 or Wavetek 8880 equivalents, and purchase lifetime buys from existing authorized distributor stock before the part becomes unavailable.
Can the MT8880CS1 transmit and receive DTMF simultaneously in a full-duplex telephone interface?
The MT8880CS1 operates in a single-function mode where the tone generator and detector share the same analog front-end; simultaneous full-duplex DTMF in both directions requires either two ICs or an external hybrid circuit to separate the transmit and receive signal paths. In practice, telephone autodialer and alarm communicator designs use the MT8880CS1 in half-duplex mode, transmitting DTMF at up to 10 digits per second and then switching to receive mode for acknowledgment tones.
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