DS21Q43AT+

Telecom Overview

The DS21Q43AT+ is a quad E1 framer integrated circuit manufactured by Analog Devices Inc./Maxim Integrated. It integrates four independent DS2143 E1 controllers onto a single monolithic die, providing space savings for multi-channel applications. The device supports CEPT or PCM-30 and ISDN-PRI framing formats including FAS, CAS, CCS, and CRC4. Each framer features dual two-frame elastic stores capable of connecting to asynchronous or synchronous backplanes up to 8.192 MHz. It operates on a 5V supply with low power CMOS technology and is available in a 128-pin TQFP package. The industrial grade version (DS21Q43ATN) supports temperatures from -40°C to +85°C.

Telecom Feature Summary

• Four fully independent framers with separate transmit and receive sections
• Dual two-frame elastic stores per framer for clock domain adaptation
• Supports multiple framing formats including FAS, CAS, CCS, and CRC4
• Programmable output clocks for Fractional E1 and per-channel loopback

Telecom Applications

• Fractional E1 systems
• ISDN-PRI applications
• H0 and H12 service implementations
• Drop-and-insert channel configurations

Telecom Procurement Notes

Verify the specific suffix 'T' against official documentation to confirm temperature range and packaging details. Confirm availability status as components may be subject to discontinuation or limited supply. Ensure the host system interface matches the required 5V logic levels and bus timing configuration.

Telecom Selection Notes

Select this component when multiple independent E1 channels are required within a compact footprint. Verify that the application requires 5V operation and 128-pin TQFP packaging. Consider the DS21Q43ATN variant if industrial temperature specifications are mandatory for the deployment environment.

Telecom Part Context

This device belongs to the DS21Q43A family of quad E1 framers. It is pin-compatible with the DS21Q41B Quad T1 Framer, facilitating design transitions between T1 and E1 standards. The 'A' designation indicates enhanced features compared to the single-chip DS2143 controller.

Telecom Replacement Considerations

The DS21Q41B is a pin-compatible alternative for T1 applications. Verify functional equivalence regarding elastic store capabilities and control register mapping before substitution.