HT817D0 Datasheet | Holtek Semiconductor

Features - - - - - - - - - Operating voltage: 3.6V~5.0V Directly drives an external transistor Low standby current (1m A typ. for VDD=3V) Minimal external ponents 508 words table ROM for key functions Programmable silence length and end-pulse width (minimal end-pulse width is 330ms at a 6k Hz sampling rate) 16.8-second voice capacity (based on a 6k Hz sampling rate) Section options - Retriggerable - Non-retriggerable FLAG1 options - End-pulse output - 3Hz B flash - 6Hz B flash - Voice output indication - Busy output - - - - - 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 6k Hz 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 - - - Leisure products Alarm clocks Public address system - - 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 6k Hz 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 HT817D0 provides 12 key inputs and 2 programmable FLAG outputs. With a 3.6V~5.0V power supply, a plete synthesized voice playback system can be easily built with very few external ponents. The customer¢s voice sources are recorded section 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. March 15, 2000 Block Diagram K E Y 1 K E Y 1 2 O S C 1 O S C 2 D e b o u n c e C ir c u it O s c illa to r C ir...