Information Storage Device ISD 1420
Information Storage Device ISD 1420 is single-chip, Record/Playback solutions to short-duration messaging applications. The CMOS devices include an on-chip oscillator, microphone preamplifier, automatic gain control, anti-aliasing filter, smoothing filter, and speaker amplifier. A minimum Record/Playback subsystem can be configured with a microphone, a speaker, several passive components, two push buttons and a power source. Recordings are stored into onchip non-volatile memory cells, providing zero-power message storage. This unique, single-chip solution is made possible through Winbond’s patented Multi-Level Storage (MLS) technology. Voice and audio signals are stored directly into memory in their natural form, providing high-quality, solidstate voice reproduction.
General Description Of Information Storage Device ISD 1420
The Winbond’s ISD1400 series offer 6.4 and 8.0 kHz sampling frequencies, allowing the user a choice of speech quality options. The speech samples are stored directly into on-chip non-volatile memory without the digitization and compression associated with other solutions. Direct analog storage provides a very true, natural sounding reproduction of voice, music, tones, and sound effects not available with most solidstate digital solutions. To meet end system requirements, the ISD1400 series offer single-chip solutions at 16 and 20 seconds. One of the benefits of Winbond’s ChipCorder® technology is the use of on-chip non-volatile memory, providing zero-power message storage. The message is retained for up to 100 years typically without power. In addition, the device can be re-recorded typically over 100,000 times. The ISD1400 ChipCorder® series are controlled by a single control signal, REC, PLAYE (edgeactivated playback) or PLAYL (level-activated playback). The ISD1400 parts are configured for simplicity of design in a single/multiple-message application. Using the address lines will allow multiple message applications. At the end of a playback or record cycle, the ISD1400 series automatically return to a low-power standby mode, consuming typically 0.5 μA. After a playback cycle, the device powers down automatically at the end of the message. After a record cycle, the device powers down immediately after REC is pulled to HIGH.
Feature Of Information Storage Device ISD 1420
- Single +5 volt power supply
- Duration: 14 and 20 seconds.
- Easy-to-use single-chip, voice record/playback solution
- High-quality, natural voice/audio reproduction
- Manual switch or microcontroller compatible Playback can be edge- or level-activated
- Directly cascadable for longer durations
- Automatic power-down (push-button mode)
- Standby current 1 μA (typical)
- Zero-power message storage
- o Eliminates battery backup circuits
- Fully addressable to handle multiple messages
- 100-year message retention (typical)
- 100,000 record cycles (typical)
- On-chip oscillator
- Programmer support for play-only applications
- Available in die, PDIP and SOIC
- Commercial – Packaged unit : 0°C to 70°C, Die : 0°C to 50°C
- Industrial – Packaged unit : -40°C to 85°C
Block Diagram Of Information Storage Device ISD 1420
Operational Mode Of Information Storage Device ISD 1420
The ISD1400 series have several built-in operational modes providing maximum functionality with a minimal additional components. The operational modes use the address pins, but are mapped to outside the normal address range. When the two Most Significant Bits (MSBs), A6 and A7, are HIGH, the remaining address signals are interpreted as mode bits and not as address bits. Therefore, operational modes and direct addressing are not compatible and cannot be used simultaneously. There are two important considerations for using operational modes. Firstly, all operations begin initially at address 0, which is the beginning address. Later operations can begin at other address locations, depending on the operational mode(s) chosen. In addition, the address pointer is reset to 0 when the device is changed from record to playback but not from playback to record when A4 is HIGH in Operational Mode. Secondly, an Operational Mode is executed when any of the control inputs, PLAYE , PLAYL or REC, goes LOW and the two MSBs are HIGH. This Operational Mode remains in effect until the next LOW-going control input signal, at which point the current address/mode levels are sampled and executed with information storage device ISD 1420.