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HT817D0(20SOP) Datasheet

  • HT817D0(20SOP)

  • Speech Synthesizer

  • 204.70KB

  • 15頁

  • ETC

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HT817D0
16.8-Second LOG-PCM Speech
Features
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Operating voltage: 3.6V~5.0V
Directly drives an external transistor
Low standby current (1mA typ. for V
DD
=3V)
Minimal external components
508 words table ROM for key functions
Programmable silence length and end-pulse
width (minimal end-pulse width is 330ms at a
6kHz sampling rate)
16.8-second voice capacity (based on a 6kHz
sampling rate)
Section options
-
Retriggerable
-
Non-retriggerable
FLAG1 options
-
End-pulse output
-
3HzB flash
-
6HzB flash
-
Voice output indication
-
Busy output
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FLAG2 options
-
3Hz flash
-
6Hz flash
-
Busy output
12 keys
Controllable volume
Key options
-
Stop key: KEY12
-
Random (only for KEY1)
-
Sequential (only for KEY1)
-
Repeat (for all KEYs)
-
Key debounce time (for all KEYs): 700ms,
22ms, 45ms, 180ms (based on a 6kHz
sampling rate of)
-
One shot (for all KEYs)
-
Level-trigger
-
Pull-high resistance (for all KEYs)
Dice form or 20/24-pin DIP/SOP package
Applications
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Leisure products
Alarm clocks
Public address system
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Alert and warning system
Sound effect generators
General Description
The HT817D0 is a single chip LOG-PCM voice
synthesizer LSI with 16.8-second voice capacity
at 6kHz sampling rate. The chip when trig-
gered 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 HT817D0 provides 12 key inputs and 2 pro-
grammable FLAG outputs. With a 3.6V~5.0V
power supply, a complete synthesized voice
playback system can be easily built with very
few external components.
The customer壟s voice sources are recorded sec-
tion by section into an internal mask ROM. The
sectional playback arrangement instructions of
each key are stored in the table ROM. The key
features are also programmable. With such a
flexible structure, the HT817D0 is excellent for
versatile voice applications.
1
March 15, 2000
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