HT818D0 - Holtek Semiconductor Inc

HT818D0 22.4-Second LOG-PCM Speech

The HT818D0 is a single chip LOG-PCM voice synthesizer LSI with 22.4-second voice capacity at a 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 HT818D0 provides 12 key inputs and 2 programmable FLAG outputs. Wi.

Features

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· Operating voltage: 3.6V~5.0V Directly drives an external transistor Low standby current (1mA typ. for VDD=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) 22.4-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 Controllable volume 12.