I will be controlling the inputs of these XORs directly from a PIC output, both PIC and Logic powerd from the same regulated +5V. I have two choices:
ST's Single XOR 74V1G86STR in a SOT23-5L
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OR
Fairchilds Tinylogic UHS Single XOR NC7SZ86M5X in a SOT23-5L
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They are both astonishingly similar: both have a VIH minimum of .7 @ 5V both have a VIL maximum of .3 @ 5V
The Tinylogic can provide up to -+ 24mA at output The ST can provide a minimum of 8 mA at output
The XOR's output is directly connected to the two Reset pins on a 556. Hence when the XOR goes high, the 556 begins oscillating. When the XOR output goes low, the 556 goes back down to outputting 0V.