W91031SG T&R

Overview

The W91031SG T&R is a low-power CMOS integrated circuit designed for Caller Identification applications, supporting Bellcore and British Telecom specifications. It operates within a supply voltage range of 3.0 V to 5.5 V and functions at an operational temperature of 0°C to 75°C. The device utilizes a 3.579545 MHz system clock and features FSK demodulation for Bell 202 and CCITT V.23 signals at 1200 baud. Key electrical parameters include a standby supply current of 1 μA maximum and operating currents ranging from 1.0 mA to 3.6 mA depending on the mode and voltage. It provides ring detection, line reversal detection, and dual tone alert signal detection capabilities.

Feature Summary

• Supports Bellcore TR-NWT-000030, SR-TSV-002476, British Telecom SIN227, and CCA specifications for caller ID systems.
• Integrates FSK demodulation for Bell 202 and CCITT V.23 standards with a 1200 baud rate capability.
• Includes dedicated hardware for ring detection, line reversal detection, and dual tone alert signal detection with guard time filtering.
• Offers two selectable modes for 3-wire FSK data interface to accommodate different microcontroller synchronization requirements.

Applications

• Bellcore Calling Identity Delivery (CID) systems
• British Telecom Calling Line Identity Presentation (CLIP) systems
• Feature phones and phone set adjunct boxes
• FAX machines and answering machines
• Computer Telephony Integration (CTI) systems

Procurement Notes

Verify the specific suffix 'T&R' indicates tape and reel packaging when ordering, as standard datasheets may reference DIP or SOP tube packaging. Confirm the manufacturer origin, as the document notes Winbond Electronics Corporation intellectual property while the model prefix suggests Nuvoton. Ensure the component meets the required operational temperature range of 0°C to 75°C for your specific application environment before finalizing procurement.

Selection Notes

Select this component for designs requiring compliance with legacy Bellcore and BT caller ID protocols. Ensure the design supports a 3.579545 MHz crystal or ceramic resonator connection between OSCI and OSCO pins. Verify that the host microcontroller can interface with either Mode 0 or Mode 1 of the 3-wire FSK data interface. Check power budget constraints against the specified standby and operating currents in sleep and active modes.

Part Context

The W91031 is a specialized interface IC primarily used in telecommunication equipment for processing caller identification signals. It bridges the analog telephone line signals to digital microcontrollers by handling physical layer demodulation and detection tasks. This allows system designers to offload complex signal processing from the main CPU, simplifying the overall architecture of telephony devices.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should verify pin compatibility and electrical characteristics if considering alternative Caller ID ICs from other manufacturers such as Winbond or Nuvoton variants.