ISD2540S

Voice Record And Playback Overview

The ISD2540S is a single-chip, multiple-message voice record/playback device from the Winbond ISD2500 series. It provides a 40-second recording duration using direct analog storage in on-chip nonvolatile memory. The device operates on a single 5V supply and includes an on-chip oscillator, microphone preamplifier with automatic gain control, antialiasing filter, smoothing filter, and speaker amplifier. It supports microcontroller interfaces for complex addressing and offers six operational modes including push-button control. The component is available in die form or packaged options such as SOIC, PDIP, and TSOP.

Voice Record And Playback Feature Summary

• Direct analog storage of voice signals without digitization or compression for natural audio reproduction
• Integrated on-chip nonvolatile memory enabling zero-power message retention
• Built-in microphone preamplifier with automatic gain control and differential speaker driver
• Microcontroller compatible interface supporting multiple operational modes for flexible system integration

Voice Record And Playback Applications

• Car stereo messaging systems
• Handset voice prompts
• Transformer-based voice modules
• Single-message industrial announcements

Voice Record And Playback Procurement Notes

Verify the manufacturer origin carefully as Nuvoton Technology Corporation appears in search results for this model number alongside Winbond. Confirm the datasheet source matches the specific part revision. Ensure the ordering suffix corresponds to the required package type and temperature range. Check RoHS compliance status as historical data indicates non-compliance for some variants. Validate pin compatibility if replacing legacy components.

Voice Record And Playback Selection Notes

Select the ISD2540 variant specifically when a 40-second duration is required. Choose between packaged forms like SOIC or PDIP based on assembly constraints, noting that die versions require specific bonding layouts. Consider the sampling rate trade-off where longer durations reduce bandwidth. Verify if external clocking via XCLK is needed for precise timing or if the internal oscillator suffices. Ensure power supply decoupling meets the analog/digital separation requirements.

Voice Record And Playback Part Context

This component belongs to the Winbond ISD2500 ChipCorder series, which utilizes patented multilevel storage technology. The series includes models with 32, 48, and 64-second durations. The ISD2540 specifically targets applications requiring moderate recording times with high-quality analog voice reproduction. It is designed for cost-sensitive consumer electronics and industrial controls where single-chip simplicity is prioritized.

Voice Record And Playback Replacement Considerations

ISD2532S (32 seconds), ISD2548S (48 seconds), ISD2564S (64 seconds). These parts share identical pinouts and operational modes but differ in memory capacity and sampling frequency.