This specification contains ADVANCE INFORMATION data. ISSI reserves the right to make changes to its products at any time without notice in order to improve design and supply the best

possible product. We assume no responsibility for any errors which may appear in this publication. © Copyright 1999, Integrated Silicon Solution, Inc.

IS22C012

ADVANCE INFORMATION

FEBRUARY 1999

VERSATILE 10 SEC INSTANT

VOICE ROM

GENERAL DESCRIPTION

IS22C012 is a high quality voice synthesizer capable of

varying playback duration. A proprietary ADPCM algorithm

is used. The audio message is stored in a 256K bits on-

chip EPROM which can store up to ten seconds of voice

data at 6 KHz sample rate.

The IS22C012 eliminates the need of complicated circuitry

in voice playback but still achieves high voice quality.

Sounds such as human speech, animal sounds, musical

sounds and even special sound effects can be synthesized.

Versatile combinations in sections achieve longer playback

duration. In addition, devices can be cascaded to achieve

longer voice duration. Two devices can be configured in

parallel in order to achieve signal mixing without an external

mixer in which speech can be mixed with background

music each from one of two different chips.

The IS22C012 provides wide operating voltage range

speaker through a low cost NPN transistor. No complex

filtering or amplifier circuit is needed. An automatic ramp-

down function eliminates undesired noise at the end of

playback.

FEATURES

• Minimum 10 second voice length at 6 KHz

• Versatile features for playback

• Combination of voice building blocks

extends the duration of playback

• Voice data re-use saves memory space

• Four trigger pins, S1 to S4 for eight groups

• SBT for sequential play-all

• Holdable and unholdable, edge and level

triggering option

• 15 ms debounce time suitable for CDS

• IRP interrupt pin for master reset

• Three programmable output pins for STP Stop

Pulse, BUSY Signal, and LED

• Built-in oscillator with variable sample rate

• Single external resistor to determine sample rate

• Built-in D/A converter, EPROM

• ADPCM data compression provides high sound

quality

• Optional pop noise elimination function

directly

• Auto-power down

• 2.4V-6V single power supply operation

• Low standby current (<5

µA at 3V)

• Development tools support

Group of sections

The voice data memory area of the IS22C012 can be

subdivided into 124 sections. Any combination of these

sections will form an individual group for data playback. A

maximum of eight groups are available with activation

controlled by S1 to S4 pins. The SBT pin can be used to

trigger multiple groups playback in sequence.

Group Configuration

Voice within each group are combinations of different fixed

memory sections of up to 124 sections. These sections are

the fundamental voice building blocks for arranging

playback without limiting sequencing. This provides

flexibility and allows data to be re-used, beneficial for

applications with many repeated sounds or words.

An example of group configuration is illustrated below:

Group No.

Section Entry

Group 1

Sec 1 + Sec 2 + Sec 3 ……. Sec 109

Group 2

Sec 3 + Sec 2

Group 3

Sec 10 + Sec 11 + Sec 12

Group 4

Sec110 + Sec 10 + Sec 5

Integrated Silicon Solution, Inc. — 1-800-379-4774

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ADVANCE INFORMATION VP010-0B

02/24/99