ISD1790SYI

Overview

The ISD1790SYI is a single-chip voice record and playback integrated circuit manufactured by Nuvoton Technology Corporation. It utilizes ChipCorder technology to store audio data in internal flash memory, eliminating the need for external storage media. The device supports multiple message recording and playback operations with address trigger and direct trigger modes. It features a Class D PWM speaker driver capable of directly driving speakers or buzzers. The component operates within a voltage range of 2.4V to 5.5V and supports sampling frequencies from 4kHz to 12kHz. It is housed in a 28-pin SOIC package.

Feature Summary

• Integrated flash-based voice storage eliminates external memory requirements
• Dual operating modes including address trigger and direct trigger for flexible control
• Built-in differential Class D PWM speaker driver for direct load connection
• Selectable differential microphone input with automatic gain control

Applications

• Standalone voice messaging systems
• Security alarm announcements
• Consumer product voice prompts
• Industrial control status indicators

Procurement Notes

Verify the manufacturer designation on the component marking, as Winbond also produces functionally similar ISD1790 series devices. Confirm the suffix 'SYI' corresponds to the specific SOIC package variant required for your PCB layout. Ensure supply chain documentation explicitly identifies Nuvoton as the source to distinguish from other manufacturers offering identical part numbers.

Selection Notes

Select this component when a self-contained voice solution without external memory is required. Consider the available recording duration based on the chosen sampling frequency, which ranges from 4kHz to 12kHz. Evaluate the trigger mode requirements; address trigger allows variable message lengths, while direct trigger supports fixed message configurations. Ensure the power supply voltage aligns with the 2.4V to 5.5V operational range.

Part Context

The ISD1790 series belongs to Nuvoton's ChipCorder family of single-chip voice record/playback ICs. This series is designed for applications requiring simple voice interaction without complex microcontroller programming. The SYI suffix typically denotes the surface-mount SOIC package option, providing compatibility with automated assembly processes compared to through-hole DIP variants.