ISD2500 View Datasheet(PDF) - Information Storage Devices

Part Name

Description

Manufacturer

ISD2500

Single-Chip Voice Record/Playback Devices 32-*, 40-*, 48-*, 64-*, 60-, 75-, 90-, and 120-Second Durations

Information Storage Devices 

Product Data Sheets

ISD2532/40/48/64* DEVICE BLOCK DIAGRAM

ISD2500 Series

XCLK

Internal Clock

Timing

Sampling Clock

ANA IN

ANA OUT

MIC

MIC REF

AGC

Amp

5-Pole Active

Analog Transceivers

R

Antialiasing Filter

Pre-

Amp

Automatic

Gain Control

(AGC)

256 K Cell

Nonvolatile

Multilevel Storage

Array

5-Pole Active

Smoothing Filter

Mux Amp

SP+

SP–

Power Conditioning

Address Buffers

Device Control

VCCA VSSA VSSD VCCD A0 A1 A2 A3 A4 A5 A6 A7 A8

PD OVF P/R CE EOM AUX IN

EEPROM Storage

1

PIN DESCRIPTIONS

One of the benefits of ISD’s ChipCorder technol-

ogy is the use of on-chip nonvolatile memory,

providing zero-power message storage. The mes-

sage is retained for up to 100 years typically

without power. In addition, the device can be re-

recorded typically over 100,000 times.

Microcontroller Interface

In addition to its simplicity and ease of use, the

ISD2500 Series includes all the interfaces neces-

sary for microcontroller-driven applications. The

address and control lines can be interfaced to a

microcontroller and manipulated to perform a vari-

ety of tasks, including message assembly,

message concatenation, predefined fixed mes-

sage segmentation, and message management.

Programming

The ISD2500 Series is also ideal for playback-only

applications, where single or multiple messages

are referenced through buttons, switches, or a

microcontroller. Once the desired message config-

uration is created, duplicates can easily be

generated via an ISD programmer.

Voltage Inputs (VCCA, VCCD)

To minimize noise, the analog and digital circuits in

the ISD2500 Series devices use separate power

busses. These voltage busses are brought out to

separate pins and should be tied together as close

to the supply as possible. In addition, these sup-

plies should be decoupled as close to the package

as possible.

Ground Inputs (VSSA, VSSD)

The ISD2500 Series of devices utilizes separate

analog and digital ground busses. These pins

should be connected separately through a low-

impedance path to power supply ground.

Power Down Input (PD)

When not recording or playing back, the PD pin

should be pulled HIGH to place the part in a very

low power mode (see ISB specification). When

OVF pulses LOW for an overflow condition, PD

should be brought HIGH to reset the address

pointer back to the beginning of the Record/Play-

back space. The PD pin has additional

functionality in the M6 (Push-Button) Operational

* Advance information: ISD2532/40/48/64 devices.

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