ISSI
®
IS22C020
Integrated Silicon Solution, Inc.
1
VP002-1C
10/01/98
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 1998, Integrated Silicon Solution, Inc.
IS22C020
16 to 20 SEC INSTANT
VOICE ROM
ISSI
®
FEATURES
• Voice length at:
– 8 KHz sampling is 16 seconds
– 6 KHz sampling is 20 seconds
• Silence compression saves memory
• Four trigger pins, S1 to S4 for eight sections
• SBT pin play-all or sequential play-all
• 15 ms debounce suitable for CDs
• IRP interrupt pin stops playback at once
• STP stop pulse generated at playback end
• BUSY signal for CPU control
• Two LEDs flash at 3 Hz
• 2.4V to 6V single power supply operation
• Low standby current (<5 µA at 3V)
• Auto power-down
• Built-in oscillator, D/A converter, EPROM
• ADPCM data compression
• Optional pop noise elimination function
•C
OUT pin drives speaker with a transistor
• Development tool support
•VOUT1 and VOUT2 drives buzzer directly
• Sampling rate determined by an external resistor
• Holdable and unholdable triggering option
• Industrial temperature available
GENERAL DESCRIPTION
The IS22C020 is a high-quality voice synthesizer
with capacity from 16 to 20 seconds. A proprietary
ADPCM algorithm is used. The audio message is
stored in a 512K bit on-chip one-time programmable
memory.
The IS22C020 eliminates the need for complicated
circuitry in voice playback but still achieves high voice
quality. Sounds such as human speech, animal
sounds, musical sounds, and even special effects
can be synthesized. Devices can be cascaded to
achieve longer voice duration. Two devices can be
configured in parallel in order to achieve signal mix-
ing without an external mixer so speech can be mixed
with background music each from one of two different
chips.
The instant programming nature of the IS22C020
gives a very short turn around time free of NRE
charges usually required with conventional voice
ROMs. Users now can add a voice synthesis function
as an additional feature to their products even when
production volume is small. As a result, initial invest-
ment is minimal and the risk in the product develop-
ment phase is reduced.
The IS22C020 provides wide voltage operating range
from 2.4V to 6.0V. A pair of PWM output pins, VOUT1
and VOUT2, provide direct drive to a buzzer. Voice
quality is comparable to a speaker output and power
consumption is much lower. This facilitates button
battery applications such as greeting cards.
A current output pin, COUT, enables the device to
drive a speaker through a low cost NPN transistor. No
complex filtering or amplifier circuit is needed. An
automatic ramp-up and ramp-down function elimi-
nates undesired noise at the beginning and end of
playback.
Up to eight sections are available and accessible
through the S1 to S4 trigger pins. The SBT trigger pin
can be programmed to playback all eight sections or
sequentially from section 1 to 8. An interrupt pin
(IRP), stop pulse (STP) or BUSY signals provide
handshaking with µP or other IS22C020 devices. All
trigger pins give 15 ms debounce time and are ideal
for CDS applications. Two LED drivers are available,
flashing on and off approximately at 3 Hz. The inter-
nal voltage compensated oscillator requires only one
external resistor. Different sampling frequencies are
determined by the external oscillator resistor value.
OCTOBER 1998
ISSI
®
IS22C020
2
Integrated Silicon Solution, Inc.
VP002-1C
10/01/98
Programmable Options
The IS22C020 provides programmable user
specified control functions. They include:
• Non-sequence or Sequence play-all
• Unholdable or Holdable trigger
• STOP or BUSY signal selection
• Automatic ramp-up and ramp-down or
no ramp-up or ramp-down
Silence Compression
If a particular sound sequence includes periods of
silence, the IS22C020 will automatically compress
the silence to save memory space. This compres-
sion will not affect playback of the sound sequence.
OSCILLATOR
OSC
CLOCK
GENERATOR
CONTROL
LOGIC
S1
S2
S3
S4
SBT
IRP
LED
DRIVER
LED1
LED2
STP/BUSY
POP NOISE
REDUCTION
ADDRESS
SEQUENCER
EPROM
ADPCM
DECODER
BUZZER
BUFFER
D/A C
OUT
V
OUT1
V
OUT2
GND
VCC
BLOCK DIAGRAM
SEGMENT DECODE
12345678
S1HLLLHLLH
S2LHLLHHLL
S3LLHLLHHL
S4LLLHLLHH
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0567 8910
SAMPLE FREQUENCY (KHz)
Typical Value, Vcc = 4.5V
R
OSC
(MΩ)
11 12 13 14 15
SAMPLE FREQUENCY
ISSI
®
IS22C020
Integrated Silicon Solution, Inc.
3
VP002-1C
10/01/98
PIN CONFIGURATIONS
16-Pin DIP and SOP PIN DESCRIPTIONS
LED1
Drives First LED Flash at 3 Hz (Active LOW)
VOUT1 PWM Audio Signal Output for Buzzer
STP/BUSY Generate Busy Signal or 30 ms Pulse after Voice
Playback
GND Ground
VOUT2 Compliment PWM Audio Signal Output for Buzzer
LED2
Drives Second LED Flash at 3 Hz (Active LOW)
COUT Current Output from Internal DAC for Speaker
Playback
OSC Oscillator Resistor Pin to Control Sampling
Frequency
VPP Program Power Supply, No Connect during
Playback
S1-S4 Input Switches, Internal Pull LOW, Active HIGH
SBT One Key or Sequential Trigger, Internal Pull LOW,
Active HIGH
IRP Interrupt to Stop Playback, Internal Pull LOW,
Active HIGH
Vcc Power Supply Voltage
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
LED1
V
OUT1
V
OUT2
GND
STP/BUSY
LED2
C
OUT
OSC
IRP
SBT
S4
S3
V
CC
S2
S1
V
PP
BONDING DIAGRAM
12 13
11
(0,0)
X
Y
Note: Substrate must be connected to GND
Pad size = 95 µm x 95 µm
10
9
8
7
6
5
14
15
16
NC
2
1
3
4
BONDING PARAMETERS
Pin Name X Y
1
LED1
3288.75 1200
2VOUT1 3288.75 1459
3VOUT2 3288.75 1687
4 GND 3288.75 1894
5 STP 86.25 1875
6
LED2
86.25 1635
7COUT 86.25 1440
8 OSC 86.25 1027
9VPP 86.25 742
10 S1 86.25 465
11 S2 86.25 270
12 Vcc 86.25 82
13 S3 3288.75 88
14 S4 3288.75 296
15 SBT 3288.75 502
16 IRP 3288.75 742
Note: Programming requires connection to
pins 4, 5, 6, 8, 9, 12, 15, and 16.
ISSI
®
IS22C020
4
Integrated Silicon Solution, Inc.
VP002-1C
10/01/98
DC CHARACTERISTICS
Symbol Parameter Description Test Conditions Min. Typ. Max. Unit
VCC Operating Voltage 2.4 3.0 6.0 V
VIH Input HIGH Voltage Vcc = 3.0V 2.5 3.0 3.5 V
VIL Input LOW Voltage Vcc = 2.0V –0.3 0 0.3 V
IOH VOUT HIGH Operating Current Vcc = 3.0V, VOUT = 3.0V — –12 — mA
IOL VOUT LOW Operating Current Vcc = 3.0V, VOUT = 0V — 12 — mA
ICO COUT Operating Current Vcc = 3.0V, VCOUT = 0.7V — –2 — mA
ISTPH STP HIGH Operating Current Vcc = 3.0V, VSTP = 3.0V — –5 — mA
ISTPL STP LOW Operating Current Vcc = 3.0V, VSTP = 0V — 5 — mA
ILED LED Output Current Vcc = 2.2V – 6.0V 6 8 10 mA
ISB Standby Current Vcc = 3.0V, I/O Open — 1 5 µA
IOP Operating Current Vcc = 3.0V, I/O Open — — 100 µA
∆F/F Frequency Stability 1 – FOSC(3.5V)/FOSC(3.0V) — — 5 %
SWITCHING WAVEFORMS
S1 to S4 SEGMENT TRIGGERS. PULSE TRIGGERED.
a. Trigger is shorter than a phrase output b. Trigger is longer than a phrase output
S1
Phrase 2
S2
C
OUT
LED
STP
Phrase 1 Phrase 2 Phrase 2
ABSOLUTE MAXIMUM RATINGS(1)
Symbol Parameter Value Unit
VTERM Terminal Voltage with Respect to GND –0.5 to +7.0 V
TBIAS Temperature Under Bias –40 to +85 °C
TSTG Storage Temperature –55 to +125 °C
Notes:
1. Stress greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the
device. This is a stress rating only and functional operation of the device at these or any other conditions above
those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect reliability.
AC SWITCHING CHARACTERISTICS
Symbol Parameter Description Typ. Unit
tDD Debounce Delay 15 ms
tST Stop Pulse Width 30 ms
OPERATING RANGE
Range Ambient Temp. Vcc
Commercial 0°C to +70°C 2.4V to 6.0V
Industrial –40°C to +85°C 2.4V to 6.0V
ISSI
®
IS22C020
Integrated Silicon Solution, Inc.
5
VP002-1C
10/01/98
SWITCHING WAVEFORMS
SINGLE BUTTON TRIGGER, NONSEQUENTIAL (SBT)
a. Pulse Triggered
b. Level Triggered
Phrase 1
SBT
C
OUT
Phrase 2 Phrase N Phrase 1 Phrase N Phrase 1
Phrase 1
SBT
C
OUT
Phrase 2 Phrase 1 Phrase N Phrase 1
SINGLE BUTTON TRIGGER, SEQUENTIAL (SBT)
a. Pulse Triggered
b. Level Triggered
Phrase 1
SBT
C
OUT
Phrase 2 Phrase 2 Phrase 2 Phrase N Phrase 1
Phrase 1
SBT
C
OUT
Phrase 2 Phrase 2 Phrase 2 Phrase N Phrase 1
LEVEL TRIGGERED
a. Trigger is shorter than a phrase output b. Trigger is longer than a phrase output
S1
Phrase 2
S2
COUT
LED
Phrase 1 Phrase 2 Phrase 2
ISSI
®
IS22C020
6
Integrated Silicon Solution, Inc.
VP002-1C
10/01/98
APPLICATION CIRCUITS
TYPICAL APPLICATION
CASCADE APPLICATION
Vcc
GND
S1
S2
S3
S4
SBT
IRP
OSC COUT
SP
ROSC Vcc
GND
S1
S2
S3
S4
SBT
IRP
OSC VOUT2
ROSC VOUT1
PIEZO
BUZZER
Vcc
GND
SBT
IRP
OSC COUT
SP
ROSC
Vcc
GND
SBT
IRP
OSC
ROSC
COUT
STP
ISSI
®
IS22C020
Integrated Silicon Solution, Inc.
7
VP002-1C
10/01/98
APPLICATION CIRCUITS
PARALLEL APPLICATION
LED APPLICATION
Notes:
The following are typical values:
1. ROSC = 2 MΩ.
2. ß of N (NPN transistor) > 130.
3. SP = 8Ω. 1/4W.
4. Piezo buzzer resonant frequency = 1 KHz.
Vcc
GND
S1
S2
S3
S4
SBT
IRP
S1
S2
S3
S4
SBT
IRP
OSC COUT
SP
ROSC
Vcc
GND
OSC COUT
ROSC
VCC
GND
S1
S2
S3
S4
SBT
IRP
OSC COUT
SP
ROSC
LED2
LED1
ISSI
®
IS22C020
8
Integrated Silicon Solution, Inc.
VP002-1C
10/01/98
APPLICATION CIRCUITS
CDS APPLICATION
8-SEGMENT TRIGGER APPLICATION
Notes:
The following are typical values:
1. ROSC = 2 MΩ.
2. ß of N (NPN transistor) > 130.
3. SP = 8Ω. 1/4W.
4. Piezo buzzer resonant frequency = 1 KHz.
VCC
GND
SBT
IRP
OSC
CDS COUT
SP
ROSC
VCC
GND
S1
S2
S3
S4
OSC COUT
SW4
SW3
SW7
SW6
SW5
SW8
SW2
SW1
SP
ROSC
ISSI
®
IS22C020
Integrated Silicon Solution, Inc.
9
VP002-1C
10/01/98
NOTICE
Integrated Silicon Solution, Inc., reserves the right to make changes to the products contained in this publication
in order to improve design, performance or reliability. Integrated Silicon Solution, Inc. assumes no responsibility
for the use of any circuits described herein, conveys no license under any patent or other right, and makes no
representation that the circuits are free of patent infringement. Charts and schedules contained herein reflect
representative operating parameters, and may vary depending upon a user's specific application. While the
information in this publication has been carefully checked, Integrated Silicon Solution, Inc. shall not be liable for
any damages arising as a result of any error or omission.
Integrated Silicon Solution, Inc. does not recommend the use of any of its products in life support applications
where the failure or malfunction of the product can reasonably be expected to cause failure of the life support
system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications
unless Integrated Silicon Solution, Inc. receives written assurances, to its satisfaction, that: (a) the risk of injury
or damage has been minimized; (b) the user assumes all such risks; and (c) potential liability of Integrated Silicon
Solution, Inc. is adequately protected under the circumstances.
Copyright 1998 Integrated Silicon Solution, Inc.
Reproduction in whole or in part, without the prior written consent of Integrated Silicon Solution, Inc., is prohibited.
Integrated Silicon Solution, Inc.
2231 Lawson Lane
Santa Clara, CA 95054
Tel: 1-800-379-4774
Fax: (408) 588-0806
e-mail: sales@issiusa.com
http://www.issiusa.com
ISSI
®
ORDERING INFORMATION
Commerical Range: 0°C to +70°C
Order Part No. Package
IS22C020X Unpackaged
IS22C020P 300-mil Plastic DIP
IS22C020S 300-mil Plastic SOP
Industrial Range: –40°C to +85°C
Order Part No. Package
IS22C020XI Unpackaged
IS22C020PI 300-mil Plastic DIP
IS22C020SI 300-mil Plastic SOP
