ISD18B24X

Overview

The ISD18B24X is a single-chip voice recording and playback device from Nuvoton’s ISD18B00 ChipCorder series, designed for zero-power message storage. It operates within a supply voltage range of 2.4V to 5.5V and supports an operating temperature of 0°C to +50°C. The device features on-chip non-volatile memory providing a record duration of 12 to 24 seconds, depending on the externally selected sampling frequency (4kHz to 8kHz). Key electrical parameters include a typical standby current of 1µA, record/playback current of 15mA at 5.5V, and differential speaker outputs capable of driving an 8Ω load. It integrates a microphone amplifier with user-adjustable gain via external resistors.

Feature Summary

• Supports multiple trigger modes including level-triggered and edge-triggered record and playback operations.
• Features a special TryMe mode that automatically records, plays back once, and deletes the message upon activation.
• Includes feed-through functionality allowing direct transmission of microphone input to speaker outputs.
• Provides LED output indicators for recording and playback status.

Applications

• Voice messaging systems
• Security alarm announcements
• Industrial control audio feedback
• Consumer electronic sound effects

Procurement Notes

Verify the specific ordering suffix matches the required package type and temperature grade. Confirm that the die package option aligns with your manufacturing capabilities for surface-mount assembly. Ensure the selected sampling frequency resistor values correspond to the desired recording duration specifications outlined in the datasheet tables.

Selection Notes

Select the ISD18B24X when a longer recording duration between 12 and 24 seconds is required compared to the ISD18B12 variant. Choose this component for applications necessitating low standby power consumption and simple interface control without complex digital protocols. Consider the available sampling frequencies to balance audio quality against memory capacity constraints.

Part Context

The ISD18B24X belongs to the ISD18B00 series of ChipCorder devices, which utilize multi-level storage technology for solid-state voice reproduction. This series is part of Nuvoton's broader portfolio of audio solutions, specifically targeting cost-effective and space-constrained voice recording applications in consumer and industrial markets.

Replacement Considerations

The ISD18B12X serves as a shorter-duration alternative within the same series, offering 6 to 12 seconds of recording time. Both parts share identical pinouts and operational characteristics, differing primarily in memory capacity. No other direct cross-model replacements are documented in the provided datasheet.