ISD1750SY

Overview

The Nuvoton ISD1750SY is a single-chip multi-message voice record and playback device from the ChipCorder series. It features non-volatile message storage using patented Multi-Level Storage (MLS) technology, allowing for user-selectable durations between 33 and 100 seconds. The sampling frequency is adjustable from 4 kHz to 12 kHz via an external resistor. Operating voltage ranges from 2.4 V to 5.5 V, supporting both standalone push-button and microcontroller SPI modes. The device integrates an internal oscillator, microphone preamplifier with Automatic Gain Control (AGC), volume control, and a PWM Class D speaker driver. It is housed in a 28-SOIC package and operates within a temperature range of -40°C to 85°C.

Feature Summary

• Patented Multi-Level Storage (MLS) provides non-volatile message retention without battery backup.
• Integrated on-chip oscillator eliminates the need for external clock components.
• Built-in Automatic Gain Control (AGC) and volume control optimize audio input and output levels.
• Flexible interface supports both simple push-button operation and complex SPI-based microcontroller control.

Applications

• Electronic greeting cards and toys requiring short voice messages
• Industrial equipment status alarms and warning systems
• Consumer appliances with voice prompts or feedback
• Security alarm systems with recorded announcements

Procurement Notes

Verify component authenticity through authorized distributors as the ISD1750SY may be discontinued. Check manufacturer notices for End-of-Life (EOL) dates and recommended replacement parts such as the I2361YYI or I3800FYI. Ensure supply chain stability by confirming current stock availability and lead times before finalizing design implementations.

Selection Notes

Select this model when a recording duration between 33 and 100 seconds is required. Choose based on the desired trade-off between sound quality and memory usage by adjusting the external resistor for sampling frequencies between 4 kHz and 12 kHz. Verify that the 2.4 V to 5.5 V operating voltage aligns with the system power supply and that the 28-SOIC package fits the PCB layout constraints.

Part Context

The ISD1750SY belongs to the Nuvoton ISD1700 ChipCorder series, which offers fully integrated voice recording solutions. This series is designed for applications needing flexible message management and high reliability. The specific ISD1750 variant provides mid-range recording capacity compared to other models in the family, balancing cost and functionality for standard voice messaging needs.

Replacement Considerations

Publicly confirmed substitutes include I2361YYI and I3800FYI from Nuvoton Technology Corporation. These are listed as manufacturer-recommended replacements. Verify pin compatibility and electrical specifications against the original datasheet before substitution.