ISD1420SY

Overview

The ISD1420SY is a single-chip voice record/playback device from the ISD1400 series, manufactured by Nuvoton Technology Corporation. It utilizes Multi-Level Storage technology for direct analog storage in on-chip non-volatile memory. The component supports a 20-second recording duration with a typical sampling frequency of 6.4 kHz and a filter passband of 2.6 kHz. It operates on a single +5V supply (4.5V to 5.5V) and features an internal oscillator, microphone preamplifier, automatic gain control, and a Class D speaker amplifier. The device is available in a 28-lead SOIC package.

Feature Summary

• Direct analog storage using patented Multi-Level Storage technology for natural voice reproduction without digitization or compression.
• Integrated automatic power-down mode that reduces standby current to approximately 1 µA after record or playback cycles.
• Fully addressable architecture allowing for multiple message handling via 8-bit address inputs.
• Built-in operational modes including message cueing, looping, consecutive addressing, and EOM marker deletion.

Applications

• Short-duration messaging systems requiring manual switch or microcontroller control.
• Voice prompts and announcements in consumer electronics and industrial controls.
• Security alarm systems and access control devices needing recorded audio feedback.
• Educational toys and interactive products utilizing simple record/playback functionality.

Procurement Notes

Verify the specific suffix 'SY' against the manufacturer's official ordering information to confirm the package type and lead-free status. Confirm the commercial operating temperature range of 0°C to 70°C matches the application requirements. Check for end-of-life notifications as this series may have limited availability compared to newer models.

Selection Notes

Select the ISD1420SY when a fixed 20-second duration is required rather than variable timing. Ensure the design accommodates the 6.4 kHz sampling rate and 2.6 kHz bandwidth. Consider the need for external components such as push buttons, a microphone, and a speaker driver circuit. Verify if the internal oscillator stability meets the precision needs or if an external clock via the XCLK pin is necessary.

Part Context

The ISD1420SY belongs to the ISD1400 series, which also includes the 16-second ISD1416 variant. Both share identical electrical characteristics and pinouts but differ in maximum recording time. The series represents Winbond/Nuvoton's early implementation of solid-state voice recording using EEPROM-based multilevel storage cells.

Replacement Considerations

The ISD1900 series offers similar functionality with dual operating modes and wider voltage ranges. For direct pin-compatible replacements within the same family, verify the ISD1420PI (PDIP) or other packaging variants. Newer generations like the ISD1800 series provide digital interfaces but require different system architectures.