HT819D0 Datasheet, PDF (1/13 Pages) Holtek Semiconductor Inc – 4.2 Second LOG-PCM Speech

HT819D0
4.2 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}
• _{252 words table ROM for key functions}
• _{Programmable silence length and end-pulse}
width (minimal end-pulse width is 330µs at a
6kHz sampling rate)
• _{4.2-second voice capacity}
• _{Section options:}
– _{Retriggerable}
– _{Non-retriggerable}
• _{FLAG1 options:}
– _{End-pulse output}
– _{3HzB flash}
– _{6HzB flash}
– _{Voice output indication}
– _{Busy output}
• _{FLAG2 options:}
– _{3Hz flash}
– _{6Hz flash}
– _{Busy output}
• _{Controllable volume}
• _{6 keys}
• _{Key options:}
– _{Stop key: KEY6}
– _{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 of)
– _{One shot (for all KEYs)}
– _{Pull-high resistance (for all KEYs)}
• _{Dice form or 16-pin DIP/SOP}
Applications
• _Toys
• _{Alarm clocks}
• _{Public address system}
General Description
The HT819D0 is a single chip LOG-PCM voice
synthesizer LSI with 4.2-second voice capacity
at a 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 HT819D0 provides 6 key inputs and 2 pro-
grammable FLAG outputs. With a 2.4V~5.0V
power supply, a complete synthesized voice
playback system can be easily built with very
few external components.
• _{Alert and warning system}
• _{Sound effect generators}
The customer’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 HT819D0 is excellent for
versatile voice applications.
1
6th May ’98