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HT694 Datasheet(PDF) 5 Page - Holtek Semiconductor Inc |
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HT694 Datasheet(HTML) 5 Page - Holtek Semiconductor Inc |
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5 / 14 page  Functional Description Operation The 3 18 series of decoders provides various com- binations of address and data pins in different packages. It is paired with the 3 18 series of encoders. The decoders receive data transmit- ted by the encoders and interpret the first N bits of the code period as address and the last 18–N bits as data (where N is the address code number). A signal on the DIN pin then activates the oscillator which in turns decodes the incom- ing address and data. The decoders will check the received address twice continuously. If all the received address codes match the contents of the decoder’s local address, the 18–N bits of data are decoded to activate the output pins, and the VT pin is set high to indicate a valid transmission. That will last until the address code is incorrect or no signal has been received. The output of the VT pin is high only when the transmission is valid. Otherwise it is low al- ways. Output type There are 2 types of output to select from: • Momentary type The data outputs follow the encoder during a valid transmission and then reset. • Latch type The data outputs follow the encoder during a valid transmission, and are then latched in this state until the next valid transmission occurs. Flowchart Note: The oscillator is disabled in the standby state and activated as long as a logic “high” signal is applied to the DIN pin. i.e., the DIN should be kept “low” if there is no signal input. 3 18 Series of Decoders 5 2nd Oct ’97 |
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Similar Description - HT694 |
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