AS2535UT-T

Overview

The AS2535UT-T is a CMOS integrated circuit designed for building high-performance electronic telephones with basic features. It incorporates a line interface, speech circuit, dialler, and ringer in a single-chip, single-die configuration. The device supports LD/MF dialing, mixed-mode dialing, and offers 12 direct memory keys. It operates within a supply voltage range of 3.8V to 5V and draws 4mA during speech mode. The IC is available in a 28-pin SOIC package or as a die for chip-on-board mounting.

Feature Summary

• Integrated line interface with electronic volume control and microphone mute
• Supports LD/MF dialing with 12 direct memory keys and last number redial
• Built-in tone ringer with melody selection and frequency discrimination
• Unique EMI performance achieved through CMOS amplifier design

Applications

• Electronic telephone sets with basic features
• Telecom interfaces requiring single-chip solutions
• PABX compatible telephony systems

Procurement Notes

Verify the specific ordering suffix UT-T against the manufacturer's current documentation to confirm package type and availability status. Cross-reference the Digikey part number AS2535-ND with official datasheets to ensure component authenticity and correct pinout compatibility before integration into designs.

Selection Notes

Select the AS2535UT-T when 12 direct memory keys are required without repeat dialing functionality. Ensure the application environment supports the specified operating temperature range of -25°C to +70°C. Verify that the external components match the complex impedance requirements for EU compliance and proper line loss compensation.

Part Context

The AS2535 is part of the AS253x family from ams OSRAM (formerly austriamicrosystems). This family includes variants like the AS2533, AS2534, and AS2536, which differ primarily in memory configurations and feature sets such as repeat dialing. The AS2535 specifically provides 12 direct memories but lacks the repeat dialing function found in other models.

Replacement Considerations

Public confirmed substitute part numbers: AS2535UT-Z.