ISD1740EYR

Overview

The ISD1740EYR is a single-chip voice record and playback IC from Nuvoton’s ChipCorder series, housed in a 28-TSOP package. It supports multiple message recording with durations ranging from 33 to 100 seconds. The device operates on a supply voltage of 2.4 V to 5.5 V and features an internal oscillator. Sampling frequencies are selectable between 4 kHz and 12 kHz via external components. Control interfaces include push-button inputs and SPI communication for microcontroller integration. Key functional blocks include automatic gain control (AGC), volume control, and a PWM Class D speaker driver output.

Feature Summary

• Integrated multi-message management system allowing self-managed address locations without complex external logic.
• Dual interface capability supporting standalone push-button operation or SPI-controlled microcontroller environments.
• Built-in analog front-end with microphone preamplifier featuring automatic gain control and auxiliary analog input.

Applications

• Voice-enabled consumer electronics requiring simple message playback
• Industrial equipment status alerts and operator prompts
• Educational toys and interactive learning devices

Procurement Notes

Verify component authenticity through authorized distributors as the ISD1740EYR may be subject to obsolescence notices. Confirm current stock availability and lead times directly with suppliers. Ensure the ordering suffix matches the required package type and temperature range specifications before finalizing purchase orders.

Selection Notes

Select this model when application requirements specify message durations between 33 and 100 seconds with sampling rates up to 12 kHz. Choose this part over longer-duration variants if board space constraints favor the 28-TSOP package. Verify that the system power supply remains within the 2.4 V to 5.5 V operating range for optimal performance.

Part Context

The ISD1740EYR belongs to the Nuvoton ISD1700 ChipCorder family, which provides non-volatile flash-based voice storage solutions. This series is designed to replace traditional magnetic tape or discrete memory chips in voice messaging applications. The EYR suffix typically denotes the specific surface-mount packaging configuration used for automated assembly processes.

Replacement Considerations

Check for direct pin-compatible upgrades within the ISD1700 series offering different duration options. Evaluate newer generations such as the ISD1900 series for enhanced trigger modes and wider voltage ranges if available. Consult manufacturer documentation for any recommended replacements due to end-of-life status.