DS21Q41BT

Telecom Overview

The DS21Q41BT is a quad T1 framer integrated circuit manufactured by Analog Devices Inc./Maxim Integrated. It integrates four independent T1 DS1/ISDN-PRI framing transceivers onto a single monolithic die, offering significant space savings for applications requiring multiple T1 channels. The device supports D4, ESF, and SLC-96 framing formats and includes dual two-frame elastic stores in each framer to accommodate asynchronous or synchronous backplanes up to 8.192 MHz. It features an 8-bit parallel control port compatible with multiplexed or non-multiplexed buses, ANSI ones density monitoring, CSU loop code generation, and programmable output clocks for Fractional T1 and per-channel loopback applications. The component operates on a 5V supply and is available in a 128-pin TQFP package.

Telecom Feature Summary

• Integrates four fully independent T1 framers on a single chip without shared synchronizers
• Supports D4, ESF, and SLC-96 framing formats with robbed bit signaling extraction and insertion
• Includes dual two-frame elastic stores per framer for clock domain crossing up to 8.192 MHz
• Features an 8-bit parallel control port supporting both Intel and Motorola bus timing configurations

Telecom Applications

• Fractional T1 channel service implementations
• ISDN-PRI interface units
• Channel Service Unit (CSU) loop code generation and detection
• Per-channel loopback testing and debugging

Telecom Procurement Notes

Verify the specific suffix 'BT' against official documentation to confirm temperature grade and packaging details. Confirm current availability status as legacy components may have limited supply chains. Ensure compatibility with existing system voltage requirements of 5V. Check for pin-out alignment if replacing older single-framer designs with this quad-integrated solution.

Telecom Selection Notes

Select this component when board space is constrained but multiple T1 channels are required. It serves as a direct replacement for multiple discrete DS2141A devices. Consider the industrial temperature range variant (DS21Q41BTN) if operation outside standard commercial limits is necessary. Verify software compatibility with existing DS2141A register maps for simplified migration.

Telecom Part Context

The DS21Q41B combines four DS2141A T1 controllers into one device. The 'B' designation indicates added features not present in the single-device version. It is pin-compatible with the DS21Q43 Quad E1 Framer, allowing for flexible design choices between T1 and E1 standards within similar hardware footprints.

Telecom Replacement Considerations

The DS21Q41BTN is the industrial temperature grade (-40°C to +85°C) equivalent. For single-channel replacements, the DS2141A is the base component. No other direct substitutes are documented in the provided datasheet.