AS2536

Overview

The AS2536 is a CMOS integrated circuit designed for high-performance electronic telephone sets with basic features. It incorporates a line interface, speech circuit, dialler, and ringer in a single-chip architecture. The device supports LD/MF dialing, mixed-mode dialing, and offers 4 direct memories and 10 indirect memories. It operates within a supply voltage range of 3.8V to 5V and consumes 4mA during speech mode. The IC is available in a 28-pin SOIC package or as a die, suitable for surface mount or chip-on-board mounting.

Feature Summary

• Integrated line interface with electronic volume control and microphone mute capabilities
• Supports LD/MF dialing with 31-digit last number redial functionality
• Includes 4 direct and 10 indirect memory keys for abbreviated dialing
• Features a 3-tone melody generator with programmable ring frequency discrimination

Applications

• Electronic telephone sets requiring basic telephony functions
• PABX systems utilizing sliding cursor protocol for redialing
• Telecom interfaces needing real or complex impedance compliance

Procurement Notes

Verify the specific ordering suffix to confirm the package type (SOIC vs. Die) and bond options. Confirm RoHS compliance status as the product may be obsolete. Check for alternative packaging types if standard trays are unavailable. Ensure the supplier provides valid datasheets matching revision 8.10 for accurate pin configuration and electrical characteristics.

Selection Notes

Select the AS2536 when 4 direct and 10 indirect memory slots are required. Choose this model over AS2533 if repeat dialing by busy is needed. Ensure the application supports the 3.8V to 5V supply range. Verify that the external components can meet EU compliant impedance requirements. Consider the 28-SOIC package dimensions for PCB layout constraints.

Part Context

The AS2536 belongs to the AS253x family of multi-standard CMOS telephone ICs manufactured by ams AG. It is pin-compatible with the AS2533, AS2534, and AS2535 variants. The family shares common core functionalities like line interface and speech circuits but differs in memory configurations and dialing features. The AS2536 specifically bridges the gap between basic LNR models and those with higher direct memory counts.

Replacement Considerations

AS2536UT-Z is a tape and reel version of the same component. AS2533 is a compatible variant with identical direct memory but lacks repeat dialing. AS2535 offers 12 direct memories but no indirect memories or repeat dialing. Verify bond options match the required feature set before substitution.