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HT813D0

5.6 Second LOG-PCM Speech

Holtek Semiconductor 

HT813D0

5.6 Second LOG-PCM Speech

Features

• Operating voltage: 2.4V~5.0V

• Directly drives an external transistor

• Low standby current (1µA typ. for VDD=3V)

• Minimal external components

• 380 words table ROM for key functions

• Programmable silence length and end-pulse

width (minimal end-pulse width is 330µs at a

6kHz sampling rate)

• 5.6-second voice capacity (based on a 6kHz

sampling rate)

• Controllable volume

• FLAG1 options:

– End-pulse output

– 3HzB flash

– 6HzB flash

– Voice output indication

– Busy output

• FLAG2 options:

– 3Hz flash

– 6Hz flash

– Busy output

• 8 keys

• Key options:

– Stop key: KEY8

– Random (only for KEY1)

– Sequential (only for KEY1)

– Repeat (for all KEYs)

– Key debounce time (for all KEYs): 700µs,

22ms, 45ms, 180ms (based on a 6kHz sam-

pling rate)

– One shot (for all KEYs)

– Level-trigger

– Pull-high resistance (for all KEYs)

• Section options:

– Retriggerable

– Non-retriggerable

• Dice form or 16-pin DIP/SOP

Applications

• Toys

• Alarm clocks

• Public address system

General Description

The HT813D0 is a single-chip LOG-PCM voice

synthesizer LSI with 5.6-second voice capacity

at 6kHz sampling rate. The chip when triggered

drives a speaker through an external transistor

with a current switch D/A converter output.

Negligible current will be consumed in the

standby state.

The HT813D0 provides 8 key inputs and 2 pro-

grammable FLAG outputs. With 2.4V~5.0V

power supply, a complete synthesized voice

playback system can be easily built with very

few external components.

• Alert & warning system

• Sound effect generators

The customer’s voice sources are recorded sec-

tion by section into an internal mask ROM. The

instructions of section playback arrangement of

each key are stored in the table ROM. The key

features are also programmable. With such a

flexible structure, the HT813D0 is excellent for

versatile voice applications.

1

5th May ’98

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