MT8976AP1

Telecom Overview

The MT8976AP1 is a T1/ESF framer circuit manufactured by Microsemi (formerly Zarlink). It supports D3/D4 or ESF framing and is SLC-96 compatible. The device features two frame elastic buffers with a 32 µsec jitter buffer capacity. It handles insertion and detection of A, B, C, and D bits, offering signaling freeze and optional debounce functions. Line coding options include selectable B8ZS, jammed bit (ZCS), or no zero code suppression. It provides yellow and blue alarm signal capabilities along with bipolar violation, FT error, and CRC error counting. The component operates within a temperature range of -40 °C to +85 °C and is housed in a 44-pin PLCC package.

Telecom Feature Summary

• Supports D3/D4 and ESF framing modes with SLC-96 compatibility
• Includes dual frame elastic buffers for jitter management
• Provides comprehensive error monitoring including CRC and bipolar violation counts
• Offers flexible line coding selection such as B8ZS and ZCS

Telecom Applications

• DS1/ESF digital trunk interfaces
• Computer to PBX interfaces (DMI and CPI)
• High speed computer to computer data links

Telecom Procurement Notes

Verify the manufacturer designation carefully, as the part may be listed under Microsemi or its predecessor Zarlink Semiconductor due to corporate acquisitions. Confirm the specific suffix 'P1' indicates lead-free matte tin plating and compliance with environmental standards. Ensure the package type matches the required 44-pin PLCC footprint for your design. Check for any updated datasheet revisions that might affect pinout or electrical characteristics compared to older versions.

Telecom Selection Notes

Select this component when designing T1 interface circuits requiring robust framing and error detection capabilities. It is suitable for applications needing specific line coding options like B8ZS or ZCS. Consider the operating temperature range if the environment exceeds standard commercial limits. Verify compatibility with existing system clocking and bus interfaces before finalizing the design.

Telecom Part Context

This device belongs to the family of T1/E1 framer and interface integrated circuits. It is designed to handle the physical layer framing requirements for North American T1 digital transmission systems. The component integrates essential functions for signal integrity monitoring and synchronization, reducing the need for external logic components in standard telecom applications.

Telecom Replacement Considerations

The MT8976APR1 is a tape and reel version of the same functional device. The MT8976AE1 offers a 28-pin PDIP package alternative. Cross-referencing with other T1 framers from different manufacturers requires careful verification of pinouts and electrical specifications.