ISD1740SY

Overview

The ISD1740SY is a member of the Nuvoton ISD1700 ChipCorder series, a fully integrated single-chip multi-message voice record and playback device. It utilizes patented Multi-Level Storage (MLS) for non-volatile message storage, allowing self-management of address locations without external microcontroller intervention in stand-alone mode. The device supports user-selectable message durations ranging from 26 to 120 seconds and features an adjustable sampling frequency between 4 kHz and 12 kHz via an external resistor. Operating voltage spans 2.4 V to 5.5 V, accommodating various battery or line-powered applications. Integrated peripherals include an on-chip oscillator, microphone preamplifier with Automatic Gain Control (AGC), auxiliary analog input, anti-aliasing filter, smoothing filter, volume control, and a Pulse Width Modulation (PWM) Class D speaker driver.

Feature Summary

• Proprietary message management system enables sophisticated multi-message flexibility in a simple push-button environment by automatically managing address locations.
• Patented Multi-Level Storage (MLS) technology provides high-density non-volatile memory for reliable long-term voice data retention.
• Integrated audio processing chain includes microphone preamplifier with Automatic Gain Control (AGC), anti-aliasing filter, and PWM Class D speaker driver for direct speaker connection.

Applications

• Electronic systems requiring standalone voice prompts or announcements
• Battery-operated devices needing flexible recording duration versus quality trade-offs
• Consumer electronics utilizing push-button voice messaging interfaces

Procurement Notes

Verify the specific suffix 'SY' against the official Nuvoton datasheet to confirm package type and temperature grade. Ensure the required message duration and sampling frequency align with the ISD1740 variant's specifications before ordering. Cross-reference the manufacturer's latest documentation to confirm availability and any potential pin-compatible alternatives within the ISD1700 series.

Selection Notes

Select the ISD1740SY when application requirements demand up to 120 seconds of recording time with standard voice quality. Choose this component over other ISD1700 variants if the specific duration and sampling rate options match the design constraints. Consider the operating voltage range of 2.4 V to 5.5 V to ensure compatibility with the system power supply. Evaluate the need for stand-alone operation versus microcontroller-controlled SPI mode based on system complexity.

Part Context

The ISD1740SY belongs to the ISD1700 ChipCorder series, which represents a family of high-quality, fully integrated voice recording solutions. This series is designed for electronic systems requiring versatile message management capabilities. The ISD1700 family shares common architectural features such as MLS technology and integrated audio peripherals, differing primarily in memory capacity and resulting message duration limits.

Replacement Considerations

Other models within the ISD1700 series may serve as substitutes depending on required message duration. Verify pin compatibility and functional equivalence with specific part numbers listed in the official ISD1700 datasheet before replacement.