I met Matt Warnock , in sci.electronics.design at the date of Thu, 26 Feb 2004
19:47:30 -0500, when we had ideas of posting and reading in the article
what are the crystal oscillator inputs/outputs for? the block diagram shows
it going to "clock circuits" but nothing internal. I don't think I need an
oscillator.
lastly, are the parameters for "current supply" being 10-16mA. Does that
mean that's the max output current of the D1-8 outputs? to test the
circuit, I'd like to use LEDs on the outputs but I don't want to burn the
outputs out so I'd like to know the max current out for the chip or each
pin.
I've readed the datasheet for HT9170 (also a DTMF decoder so they should have
some things in common) while trying to repair a caller ID device (almost nothing
repairable. 95% done in 2 or 3 custom IC's) and it also needed a crystal. I
think it's for the internal "switched capacitor" filters.
For "current supply", methinks it means how many current is required from the
power supply.
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