ISD · 2727 North First Street, San Jose, CA 95134 · TEL: 408/943-6666 · FAX: 408/544-1787 · http://www.isd.com

July 2000

Figure: ISD1810 Block Diagram

GENERAL DESCRIPTION

Information Storage Devices' ISD1810 ChipCorder

provides high-quality, single-chip, single-message,

record/playback solution with user-selectable du-

rations of 8 to 16 seconds. The CMOS devices in-

clude an on-chip oscillator (with external control),

microphone preamplifier, automatic gain con-

trol, anti-aliasing filter, multilevel storage array,

smoothing filter, and speaker amplifier. A mini-

mum record/playback subsystem can be config-

ured with a microphone, a speaker, several

passive components, two push-buttons, and a

power source.

Recordings are stored in on-chip nonvolatile mem-

ory cells, providing zero-power message storage.

This unique, single-chip solution is made possible

through ISD's patented multilevel storage technology.

Voice and audio signals are stored directly into

memory in their natural form, providing high-quality,

solid-state voice reproduction.

ISD1810

Single-Chip, Single-Message Voice Record/Playback

Device 8- to 16-Second Durations

Advance Information

ISD1810 Product

Voice Solutions in Silicon

FEATURES

Easy-to-use single-chip, single-message voice

record/playback solution

High-quality, natural voice/audio reproduction

Push-button interface

Playback can be edge- or level-

activated

Variable record/playback duration controlled

by external resistor selection which sets sample

rate.

8 KHz sample rate

8 seconds

6.4 KHz sample rate

10 seconds

5.3 KHz sample rate

12 seconds

4.0 KHz sample rate

16 seconds

Automatic power-down mode

Enters standby mode immediately fol-

lowing a record or playback cycle

0.5 µA standby current (typical)

On-chip 8

9 speaker driver

Zero-power message storage

Eliminates battery backup circuits

100-year message retention (typical)

10,000 record cycles (typical)

On-chip oscillator

No algorithm development required

Single +3 volt power supply

Available in die form and 28-pin 600 mil DIP

(for sampling only)

NOTE

A resistor value of 100 K9 at the ROSC pin provides this specified duration. Only this duration is
guaranteed and tested.

Part

Number

Minimum Duration

(Seconds)

Maximum Input Sample Rate

(KHz)

Typical Filter Upper

Pass Band (KHz)

ISD1810

6.4

2.6

Table of Contents

ISD

iii

DETAILED DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Speech/Sound Quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Duration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

NONVOLATILE Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Basic Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Automatic Power-Down Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

PIN DESCRIPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Voltage Supplies (V

CCA

, V

CCD

) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Ground Supplies (V

SSA

, V

SSD

) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Record (REC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Playback, Edge-Activated (PLAYE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Playback, Level-Activated (PLAYL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Record LED Output (RECLED) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Microphone Input (MIC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Microphone Reference (MIC REF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Automatic Gain Control (AGC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Speaker Outputs (SP+, SP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

External Clock (XCLK) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Resistor Controlled Oscillator (ROSC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Feed Through (FT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

FUNCTIONAL DESCRIPTION EXAMPLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

TIMING DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

PHYSICAL DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

ORDERING INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

ISD1810 Product

ISD

DETAILED DESCRIPTION

SPEECH/SOUND QUALITY

ISD's patented ChipCorder technology provides

natural record and playback. The input voice signals

are stored directly in nonvolatile cells and are re-

produced without the synthetic effect often heard

with digital solid-state speech solutions. A complete

sample is stored in a single cell, minimizing the mem-

ory necessary to store a single message.

DURATION

The ISD1810 devices offer single-chip solutions

with 8 to 16 seconds of record/playback duration

capacity. Sampling rate and duration are deter-

mined by an external resistor connected to the

ROSC pin. These specifications apply with the re-

quired resistor value for 10-second minimum play-

back duration.

NOTE

Only the 10 second duration is guaranteed
and tested.

NONVOLATILE STORAGE

One of the benefits of ISD's ChipCorder technology

is the use of on-chip nonvolatile memory, providing

zero-power message storage. The message is re-

tained for up to 100 years without power. In addi-

tion, the device can be re-recorded typically over

10,000 times.

BASIC OPERATION

The ISD1810 ChipCorder device is controlled by

the REC pin, and either of two playback pins,

PLAYE (edge-activated playback), and PLAYL (lev-

el-activated playback). The ISD1810 parts are

configured for design simplicity in a single-mes-

sage application. Device operation is explained

on "Functional Description Example" on page 6.

AUTOMATIC POWER-DOWN MODE

At the end of a playback or record cycle, the

ISD1810 device automatically returns to a low-

power standby mode, consuming typically

0.5 µA, provided that Play REC, XCLK, and FT pins

are LOW (see DC parameters). During a playback

cycle, the device powers down automatically at

the end of the message. During a record cycle,

the device powers down immediately after REC is

released LOW.

PIN DESCRIPTIONS

VOLTAGE SUPPLIES (V

CCA

, V

CCD

)

Analog and digital circuits internal to the ISD1810

device use separate power buses to minimize

noise on the chip. These power buses are brought

out to separate pins on the package and should

be tied together as close to the supply as possi-

ble. It is important that the power supply be de-

coupled as close as possible to the package.

GROUND SUPPLIES (V

SSA

, V

SSD

)

Similar to V

CCA

and V

CCD

, the analog and digital

circuits internal to the ISD1810 device use sepa-

rate ground buses to minimize noise. These pins

should be tied together as close as possible to the

device.

RECORD (REC)

The REC input is an active-HIGH record signal. The

device records whenever REC is HIGH. This pin

must remain HIGH for the duration of the record-

ing. REC takes precedence over either playback

(PLAYL or PLAYE) signal. If REC is pulled HIGH during

a playback cycle, the playback immediately

ceases and recording begins.

NOTE

The REC signal is internally debounced on
the rising edge to prevent a false re-triggering
from a push-button switch.

ISD1810 Product

Voice Solutions in Silicon

A record cycle is completed when REC is pulled

LOW. An end-of-message (EOM) marker is internally

recorded, enabling a subsequent playback cycle

to terminate appropriately. The device automatical-

ly powers down to standby mode when REC goes

LOW. This pin has an internal pull-down device.

Holding this pin HIGH will increase standby current

consumption.

PLAYBACK, EDGE-ACTIVATED (PLAYE)

When a HIGH-going transition is detected on this

input pin, a playback cycle begins. Playback con-

tinues until an End-of-Message (EOM) marker is en-

countered or the end of the memory space is

reached. Upon completion of the playback cy-

cle, the device automatically powers down into

standby mode. Taking PLAYE LOW during a play-

back cycle will not terminate the current cycle.

This pin has an internal pull-down device. Holding

this pin HIGH will increase standby current con-

sumption.

PLAYBACK, LEVEL-ACTIVATED (PLAYL)

When this input pin transitions from LOW to HIGH, a

playback cycle is initiated. Playback continues

until PLAYL is pulled LOW, an end-of-message

marker is detected, or the end of the memory

space is reached. The device automatically powers

down to standby mode upon completion of the

playback cycle. This pin has an internal pull-down

device. Holding this pin HIGH will increase standby

current consumption.

RECORD LED OUTPUT (RECLED)

The RECLED output is LOW during a record cycle.

It can be used to drive an LED to provide feed-

back that a record cycle is in progress. In addition,

RECLED pulses LOW momentarily when an end-of-

message or end-of-memory marker is encoun-

tered in a playback cycle.

MICROPHONE INPUT (MIC)

The microphone input transfers its signal to the on-

chip preamplifier. An on-chip Automatic Gain

Control (AGC) circuit controls the gain of the

preamplifier. An external microphone should be

AC coupled to this pin via a series capacitor. The

capacitor value, together with the internal 10 K

resistance on this pin, determine the low-frequency

cutoff for the ISD1810 passband.

MICROPHONE REFERENCE (MIC REF)

The MIC REF input is the inverting input to the mi-

crophone preamplifier. This provides input noise-

cancellation, or common-mode rejection, when

the microphone is connected differentially to the

device.

Figure 1:

ISD1810 Pinouts--For Sampling
Only

NOTE:

NC means must Not Connect.

AUTOMATIC GAIN CONTROL (AGC)

The AGC dynamically adjusts the gain of the

preamplifier to compensate for the wide range of

microphone input levels. The AGC allows the full

range of sound, from whispers to loud sounds, to

be recorded with minimal distortion. Nominal val-

ues of 4.7 µF give satisfactory results in most cas-

es.

ISD1810 Product

ISD

SPEAKER OUTPUTS (SP+, SP)

The SP+ and SP pins provide direct drive for loud-

speakers with impedances as low as 8

. A single

output may be used, but, for direct-drive loud-

speakers, the two opposite-polarity outputs pro-

vide an improvement in output power of up to four

times over a single-ended connection. Furthermore,

when SP+ and SP are used, a speaker coupling

capacitor is not required. A single-ended connec-

tion will require an AC-coupling capacitor be-

tween the SP pin and the speaker.

The SP+ pin and the SP pin are internally connected

through a 50 K

resistance. When not in playback

mode, they are floating.

EXTERNAL CLOCK (XCLK)

The external clock input for the ISD1810 devices

has an internal pull-down resistor. This pin is used

for test purposes only. Do not bond this pad.

RESISTOR CONTROLLED OSCILLATOR (ROSC)

The resistor controlled oscillator input enables the

user to vary the ISD1810 device record and play-

back duration. The resistor connected between

the ROSC pin and V

(R2) determines the sample

frequency and the filter upper pass band for the

ISD1810 device. ISD recommends an ROSC resis-

tor value of 100 K

FEED THROUGH (FT)

Feed Through mode allows use of the speaker

drivers for external signals. The signal between the

MIC and MIC_REF pins will pass through the AGC,

the filter and the speaker drivers to the speaker

outputs SP+ and SP-. The input FT controls the feed

through mode. To operate this mode, the control

pins REC, PLAYE and PLAYL are held low at VSS. The

pin FT is held high to VCC. For normal operation of

record, play and power down, the FT pin is held at

VSS. The FT pin has a weak pull down to VSS.

SPECIFICATIONS

1. Stresses above those listed may cause permanent

damage to the device. Exposure to the absolute

maximum ratings may affect device reliability.

Functional operation is not implied at these

conditions.

1. V

= V

CCA

= V

CCD

2. V

= V

SSA

= V

SSD

Table 1:

Absolute Maximum Ratings

Condition

Value

Junction temperature

150°C

Storage temperature range

65°C to +150°C

Voltage applied to any pad

0.3 V) to

+ 0.3 V)

0.3 V to +7.0 V

Table 2:

Operating Conditions

Condition

Value

Operating temperature range

0°C to +50°C

Play voltage (V

)

(1)

+2.7V to +4.5V

Ground voltage (V

)

(2)

0 V

Record Supply voltage (V

)

+2.7V to 4.5V

ISD1810 Product

Voice Solutions in Silicon

1. Typical values @ T

= 25°C and 3.0 V.

2. All Min/Max limits are guaranteed by ISD via electrical testing or characterization. Not all specifications are

100 percent tested.

3. Record LED output, RECLED.
4. V

CCA

and V

CCD

connected together.

5. REC, PLAYL, PLAYE, XCLK, and FT must be at V

SSD

6. REC, PLAYL, and PLAYE.
7. REC, PLAYL and PLAYE.
8. FT.

Table 3: DC Parameters

Symbol

Parameters

Min

(2)

Typ

(1)

Max

(2)

Units

Conditions

Input Low Voltage

0.8

Input High Voltage

2.0

Output Low Voltage

0.4

= 4.0 mA

(3)

Output High Voltage

2.4

= 1.6 mA

(3)

Current (Operating)

= 4.5V

Current (Standby)

0.5

µA

(4)

(5)

ILPD1

Input Leakage Current

±1

µA

Force V

(6)

ILPD2

Input Current HIGH

150

400

µA

Force V

(7)

ILPD3

Input Current HIGH

130

µA

Force V

(8)

EXT

Output Load Impedance

Speaker Load, SP+ to SP

MIC,

MICREF

Preamp Input Resistance

MSP

MIC SP+/ Gain

AGC = 0.0 V

Table 4: AC Parameters

Symbol

Characteristic

Min

(3)

Typ

(2)

Max

(3)

Units

Conditions

Sampling Frequency

6.4

KHz

(4)

Filter Pass Band

2.6

KHz

3 dB Roll-Off Point

(5)(6)

REC

Record Duration

sec

(4)

PLAY

Playback Duration

sec

(4)

EOM

EOM Pulse Width

msec

Debounce Time

msec

ISD1810 Product

ISD

1. These specifications apply with R

OSC

equaling 100 K

2. Typical values @ T

= 25°C and 3.0 V.

3. All Min/Max limits are guaranteed by ISD via electrical testing or characterization. Not all specifications are

100 percent tested.

4. Oscillator stability may vary as much as ±5 percent over the operating temperature and voltage ranges.
5. Low-frequency cutoff depends upon value of external capacitors (see Pin Descriptions).
6. Filter specification applies to the antialiasing filter and to the smoothing filter.
7. Balanced input signal applied between MIC and MIC REF as shown in the application example. Single-ended MIC

or MIC REF recommended to be less than 100 mV peak to peak.

Figure 2: ISD1810 Application Example--Design Schematic

THD

Total Harmonic Distortion

@ 1 KHz, V

= 15 mV

Peak to Peak

OUT

Speaker Output Power

24.4

EXT

= 8

OUT

Voltage Across Speaker Pins

1.25

2.5

V pp

EXT

= 600

MIC Input Voltage

300

Peak-to-Peak

(7)

Table 4: AC Parameters

Symbol

Characteristic

Min

(3)

Typ

(2)

Max

(3)

Units

Conditions

ISD1810 Product

Voice Solutions in Silicon

FUNCTIONAL DESCRIPTION EXAMPLE

The following example operating sequence dem-

onstrates the functionality of the ISD1810 devices.

Record a message filling the memory.

Pulling the REC pin HIGH initiates a record

cycle from the beginning of the message

space. The device will automatically power

down after REC is released LOW. An EOM

marker is written at the end of message. If

REC is held HIGH, the recording continues

until the message space has been filled.

Once the message space is filled,

recording ceases.

Edge-activated playback.

Pulling the PLAYE pin HIGH initiates a

playback cycle from the beginning of the

message space. The falling edge of PLAYE

has no effect on operation. When the

device reaches the EOM marker, it

automatically powers down. If a recording

has filled the message space, the entire

message is played. A subsequent rising

edge on PLAYE initiates a new play cycle

from the beginning of the memory.

Level-activated playback.

Pulling the PLAYL pin HIGH initiates a

playback cycle from the beginning of the

message space. When the device

reaches the EOM marker, it automatically

powers down. If recording has filled the

message space, the entire message is

played. A subsequent rising edge on PLAYL

initiates a new play cycle from the

beginning of the memory.

Level-activated playback (truncated).

If PLAYL is pulled LOW any time during the

playback cycle, the device stops playing

and enters the power-down mode. A

subsequent rising edge on PLAYL initiates a

new play cycle from the beginning of

memory.

Record (interrupting playback).

The REC pin takes precedence over other

operations. Any HIGH-going transition on

REC initiates a new record operation from

the beginning of the memory, regardless of

any current operation in progress.

Record a message, partially filling the

memory.

A record operation need not fill the entire

memory. Releasing the REC pin LOW

before filling the message space causes

the recording to stop and an EOM marker

to be placed. The device powers down

automatically.

Play back a message that partially fills the

memory.

Pulling the PLAYE or PLAYL pin HIGH initiates

a playback cycle. The playback cycle

ceases when the EOM marker is

encountered and the device then powers

down.

RECLED operation.

The RECLED output pin provides an active-

LOW signal which can be used to drive an

LED as a "record-in- progress" indicator. It

returns to a HIGH state when the REC pin is

released LOW or when the recording is

completed due to the memory being

filled. This pin also pulses LOW to indicate

the end of a message has been reached.

ROSC Operation

The duration of the device can be varied

by changing the value of R2 (R

OSC

). This

means the ISD1810 device can actually

be between 8 to 16 seconds duration. See

the curve below which charts typical

durations when the R

OSC

is varied from

80 K

to 160 K

This feature allows frequency shifting where

a recorded voice or sound can be played

back faster or slower than normal for

special effects. For example, use a 100 K

resistor to make the recording and then

ISD1810 Product

ISD

PHYSICAL DIMENSIONS

Figure 9: 28-Lead 0.600-Inch Plastic Dual Inline Package (PDIP) (P)--For Sampling Only

Table 5: Plastic Dual Inline Package (PDIP) (P) Dimensions--For Sampling Only

INCHES

MILLIMETERS

Min

Nom

Max

Min

Nom

Max

1.445

1.450

1.455

36.70

36.83

36.96

0.150

3.81

0.065

0.070

0.075

1.65

1.78

1.91

0.600

0.625

15.24

15.88

0.530

0.540

0.550

13.46

13.72

13.97

0.19 4.83

0.015

0.38

0.125

0.135

3.18

3.43

0.015

0.018

0.022

0.38

0.46

0.56

0.055

0.060

0.065

1.40

1.52

1.65

0.100

2.54

0.008

0.010

0.012

0.20

0.25

0.30

0.070

0.075

0.080

1.78

1.91

2.03

0°

15°

0°

15°

Part No. 2200898D1510

2727 North First Street
San Jose, California 95134
Tel: 408/943-6666
Fax: 408/544-1787
http://www.isd.com

IMPORTANT NOTICES

The warranty for each product of ISD (Information Storage
Devices, Inc.), is contained in a written warranty which governs
sale and use of such product. Such warranty is contained in the
printed terms and conditions under which such product is sold, or
in a separate written warranty supplied with the product. Please
refer to such written warranty with respect to its applicability to
certain applications of such product.

These products may be subject to restrictions on use. Please
contact ISD, for a list of the current additional restrictions on
these products. By purchasing these products, the purchaser of
these products agrees to comply with such use restrictions. Please
contact ISD for clarification of any restrictions described herein.

ISD, reserves the right, without further notice, to change the ISD
ChipCorder product specifications and/or information in this
document and to improve reliability, functions and design.

ISD assumes no responsibility or liability for any use of the ISD
ChipCorder products. ISD conveys no license or title, either
expressed or implied, under any patent, copyright, or mask work
right to the ISD ChipCorder products, and ISD makes no
warranties or representations that the ISD ChipCorder products are
free from patent, copyright, or mask work right infringement,
unless otherwise specified.

Application examples and alternative uses of any integrated
circuit contained in this publication are for illustration purposes
only and ISD makes no representation or warranty that such
applications shall be suitable for the use specified.

The ISD products described herein may not be used in
recordable greeting cards intended for resale in Japan without
ISD's prior written consent. Recordable greeting cards are
articles, usually constructed of paper or cardboard (but not
limited to these materials), that include artwork (including
preprinted or customer-affixed photographs or artwork) and/or
editorials that have the look and feel of greeting cards and are

able to be inserted into an envelope (but do not necessarily need
to be inserted) and primarily intended to be presented or
delivered to an individual as a greeting card, that allow the sender
to record and the recipient to play back, and audio signal
message. The foregoing restriction applies only to recordable
greeting cards intended, directly or indirectly, for retail
distribution. Recordable greeting cards incorporating ISD
products may not be sold, directly or indirectly, through retail
channels without ISD's prior written consent.

The 100-year retention and 100K record cycle projections are
based upon accelerated reliability tests, as published in the ISD
Reliability Report, and are neither warranted nor guaranteed
by ISD.

Information contained in this ISD ChipCorder data sheet
supersedes all data for the ISD ChipCorder products published
by ISD prior to August, 1998.

This data sheet and any future addendum to this data sheet is
(are) the complete and controlling ISD ChipCorder product
specifications. In the event any inconsistencies exist between the
information in this and other product documentation, or in the
event that other product documentation contains information in
addition to the information in this, the information contained
herein supersedes and governs such other information in its entirety.

Copyright© 1998, ISD (Information Storage Devices, Inc.) All rights
reserved. ISD is a registered trademark of ISD. ChipCorder is a
trademark of ISD. All other trademarks are properties of their
respective owners.

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