ISSI

IS22C040

Integrated Silicon Solution, Inc.

VP009-1C
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.

IS22C040

32 to 40 SEC INSTANT VOICE ROM

ISSI

FEATURES

· Voice length at

8 KHz sampling is 32 seconds

6 KHz sampling is 40 seconds

· Silence compression to save memory

· Eight trigger pins, S1 to S8 for 32 sections

· SBT pin play-all or sequential play-all

· 15 ms debounce time suitable for CDS

· IRP interrupt pin stops playback at once

· STP stop pulse generated at end of playback

· BUSY signal for CPU control

· Two LEDs flash at 3 Hz interval

· 3.0V to 6V single power supply operation

· Low standby current (<5

A 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 tools support

· V

OUT

1 and V

OUT

2 drives buzzer directly

· Sampling rate determined by external resistor

· Holdable and unholdable triggering option

· Industrial temperature available

GENERAL DESCRIPTION

IS22C040 is a high-quality voice synthesizer with a capacity
of 32 to 40 seconds. A proprietary ADPCM algorithm is
used. The audio message is stored in a 1024-Kbit on-chip
EPROM.

The IS22C040 eliminates the need of complicated circuitry
in voice playback (Figure 1) but still achieves high voice
quality. Sounds such as human speech, animal sounds,
musical sounds, and even special sound effects can be
synthesized. Devices can be cascaded to achieve longer
voice duration (Figure 3). Two devices can be configured
in parallel (Figure 4) in order to achieve signal mixing
without an external mixer allowing speeches to be mixed
with background music synthesis from two different chips.

The instant programming nature of the IS22C040 allows a
very short production turnaround time. There are no NRE
charges that are usually required with conventional voice
ROMs. Users now can apply a voice synthesis function as
an additional feature to their products even when production
volume is relatively small. It is also ideal for trial or
engineering prototyping. As a result, the initial investment
is minimal and the risk in the product development phase
is reduced.

The IS22C040 provides a wide voltage operating range
from 3.0V to 6.0V. A pair of PWM output pins, V

OUT

1 and

OUT

2 provide direct drive to a buzzer (Figure 2). Voice

quality from a buzzer is comparable to speaker output and
power consumption is much lower.

A current output pin, C

OUT

, enables the device to drive a

speaker with a low cost NPN transistor. No complex
filtering or amplifier circuit is needed. An automatic ramp
up/down function eliminates the undesired noise at the
end of playback.

Up to 32 sections are accessible through S1 to S8. The
SBT trigger pin can be programmed to playback all 32
sections or sequentially from section 1 to 32. An interrupt
pin (IRP) and stop pulse (STP) or BUSY signals provide
handshaking with microprocessors or other IS22C040
devices. All trigger pins give 15 ms debounce time and is
ideal for CDS applications as in Figure 6. Two LED drivers
are available, flashing on and off at approximately 3Hz
intervals (Figure 5). The internal voltage compensation
oscillator requires only one external resistor. Different
sampling frequencies are determined by the external
oscillator resistor value.

OCTOBER 1998

ISSI

IS22C040

Integrated Silicon Solution, Inc.

VP009-1C

10/01/98

Programmable Options

The IS22C040 provides different control functions for user
specified applications. They include:

· Non-sequential or Sequential Play-all

· Unholdable or Holdable trigger

· STOP or BUSY signal selection

· Automatic ramp-up/ramp-down or no ramp-up/ramp-down

OSCILLATOR

OSC

CLOCK

GENERATOR

CONTROL

LOGIC

SBT

IRP

LED

DRIVER

LED2
LED1

STP

POP NOISE

REDUCTION

ADDRESS

SEQUENCER

VOICE

EPROM

ADPCM

DECODER

BUZZER
BUFFER

D/A

OUT

OUT1

OUT2

GND

Vcc

BLOCK DIAGRAM

OPERATING RANGE

Range

Ambient Temp.

Vcc

Commercial

C to +70

3.0V to 6.0V

Industrial

C to +85

3.0V to 6.0V

ABSOLUTE MAXIMUM RATINGS

(1)

Symbol

Parameter

Value

Unit

TERM

Terminal Voltage with Respect to GND

0.5 to +7.0

BIAS

Temperature Under Bias

40 to +85

STG

Storage Temperature

55 to +125

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.

Silence Compression

If a particular sound sequence includes periods of silence,
the IS22C040 will automatically compress the silence to
save memory space. This compression will not affect
playback of the sound sequence.

ISSI

IS22C040

Integrated Silicon Solution, Inc.

VP009-1C
10/01/98

SECTION TRIGGERING

Section

HIGH

ISSI

IS22C040

Integrated Silicon Solution, Inc.

VP009-1C

10/01/98

PIN DESCRIPTIONS

Name

I/O

Function

Trigger Switch 8, Internal Pull LOW,
Active HIGH

LED1

Drives First LED Flash at 3 Hz,
Active LOW

OUT1

PWM Audio Signal Output for
Buzzer

OUT2

Compliment PWM Audio Signal
Output for Buzzer

GND

Power Ground

STP/BUSY

Generate 30 ms Pulse or Busy
Signal After Voice Playback

LED2

Drives Second LED Flash at 3 Hz,
Active LOW

OUT

Current Output from Internal DAC
for Speaker Playback

OSC

Oscillator Resistor Pin to Control
Sampling Frequency

Trigger Switch 5, Internal Pull LOW,
Active HIGH

Trigger Switch 6, Internal Pull LOW,
Active HIGH

Program Power Supply, No
Connect When Voice Playback

Trigger Switch 1, Internal Pull LOW,
Active HIGH

Trigger Switch 2, Internal Pull LOW,
Active HIGH

Positive Power Supply

Trigger Switch 3, Internal Pull LOW,
Active HIGH

Trigger Switch 4, 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

Trigger Switch 7, Internal Pull LOW,
Active HIGH

Note:
1. The following pins are used to program data into the memory on the chip:

pins 5, 6, 7, 9, 12, 15, 18 and 19.

PIN CONFIGURATION

20-Pin 300-mil PDIP

LED1

OUT1

OUT2

GND

STP

LED2

OUT

OSC

IRP

SBT

ISSI

IS22C040

Integrated Silicon Solution, Inc.

VP009-1C
10/01/98

DC CHARACTERISTICS

Symbol

Parameter Description

Condition

Min.

Typ.

Max.

Unit

Operating Voltage

3.0

4.5

6.0

Standby Current

= 3.0V, I/O Open

Operating Current

Vcc

= 3.0V, I/O Open

100

Input HIGH Voltage

Vcc

= 3.0V

2.5

3.0

3.5

Input LOW Voltage

Vcc

= 3.0V

0.3

OUT

LOW O/P Current

Vcc

= 3.0V, V

OUT

= 0V

OUT

HIGH O/P Current

Vcc = 3.0V, V

OUT

= 3.0V

OUT

O/P Current

Vcc

= 3.0V, V

COUT

= 0.7V

STPH

STP LOW O/P Current

Vcc

= 3.0V, V

STP

= 0V

STPL

STP HIGH O/P Current

Vcc

= 3.0V, V

STP

= 3.0V

LED

Output Current LED

Vcc = 3.0V 6.0V

F/F

Frequency Stability

OSC

(3V) F

OSC

(3.5V)

OSC

(3V)

BONDING PARAMETERS

Pin

Name

3451.9

1599.7

LED1

3451.9

1861.0

OUT1

3451.9

2147.6

OUT2

3451.9

2444.5

GND

3368.10

2803.35

STP

137.18

2795.93

LED2

100.4

2486.3

OUT

100.4

2245.0

OSC

100.4

1790.0

100.4

1469.5

100.4

1230.0

100.4

989.6

100.4

662.3

100.4

422.7

187.05

113.78

3372.5

141.8

3451.9

581.5

SBT

3451.9

836.0

IRP

3451.9

1090.6

3451.94

1345.13

BONDING DIAGRAM

(0,0)

Note: Substrate must be connected to GND

Pad size = 100

m x 100

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