[EE:] 74hc299 resetting when I clock in a 0 bit by "michael brown" .

Originally posted to sci.electronics.basics and sci.electronics.components but no joy found Hello all, I'm tinkering with a 74HC299 and I'm having a bit of trouble. I am just using it as a serial-in/parallel-out shift register. Whenever I clock in 1 bits, all is fine. As soon as I clock in a single 0 bit, all the output registers reset to 0 simultaneously as if I had driven the reset pin low. The clock signal is from a DS1307 real time clock (1Hz). I have both OE pins tied low as I don't need the output pins blanked or tristated as I set them up (maybe this is the problem?) The reset(clear) pin is tied permanently high I've tried left shifting *and* right shifting with identical results Both serial input pins (left and right) are pulled up (I've tried them pulled down too) The cascade outputs are floating .1uF and 10uF bypass caps on power pins The datasheet is not the most descriptive, but I think I got it hooked up right. I even tried another chip with the same results. Obviously I'm doing something stupid here, but I just don't get it. :-( In summary: As long as I'm clocking in 1 bits, all works as expected. However, the first 0 bit clocked in resets all the outputs at once. I hope this sounds familiar to somebody.