ISD1740SYR

Overview

The ISD1740SYR is a ChipCorder voice record and playback IC from Nuvoton Technology Corporation, offering 26 to 80 seconds of multi-message storage. It operates on a supply voltage of 2.4 V to 5.5 V with an internal oscillator. The device supports sampling frequencies of 4 to 12 kHz and features automatic gain control and volume control. It utilizes a 28-SOIC package and includes a PWM Class D speaker driver.

Feature Summary

• Integrated non-volatile message storage using patented Multi-Level Storage (MLS) technology for reliable data retention without power.
• Built-in microphone preamplifier with Automatic Gain Control (AGC) and auxiliary analog input for optimized audio capture.
• On-chip oscillator with external resistor control allows flexible adjustment of sampling frequency and recording duration.
• Supports both standalone push-button operation and microcontroller-controlled SPI interface for versatile system integration.

Applications

• Electronic systems requiring simple push-button voice messaging
• Battery-powered devices due to low voltage operation range
• Microcontroller-based applications utilizing SPI interface
• Consumer electronics needing integrated voice recording capabilities

Procurement Notes

Verify the specific suffix of the part number to ensure correct package type and temperature rating. Confirm that the required message duration aligns with the 26 to 80-second specification of this model. Check for end-of-life status or recommended replacements if current production availability is critical for long-term projects.

Selection Notes

Choose this component when a fully integrated single-chip solution for voice messaging is required. It is suitable for applications needing user-selectable duration between 26 and 80 seconds. Consider the 28-SOIC package size and the need for either standalone or SPI-controlled operation when designing the circuit layout.

Part Context

This part belongs to the Nuvoton ISD1700 ChipCorder series, which provides high-quality, fully integrated voice record and playback functionality. The series is designed for various electronic systems, offering flexibility in message management and audio quality through adjustable sampling rates and durations.

Replacement Considerations

Publicly confirmed substitute part numbers include I2361YYI and I3800FYI from Nuvoton Technology Corporation. These are listed as manufacturer-recommended alternatives for the discontinued ISD1750SYI01, but verify compatibility for ISD1740SYR specifically.