t  = 0.693 (R  + R ) C         t  = 0.693 (R ) C
	 H         ( A    B)            L         ( B)


	period = t  + t  = 0.693 (R  + 2R ) C
	          H    L         ( A     B)

	                 1.44
	frequency ~ --------------
	             (R  + 2R ) C
	             ( A     B)  

	                               t           R
	                                L           B
	Output driver duty cycle = --------- = ----------
	                            t  + t      R  + 2R
	                             H    L      A     B

	                                 t               R
	                                  H               B
	Output waveform duty cycle = --------- = 1 - ----------
	                              t  + t          R  + 2R
	                               H    L          A     B

	                     t        R  
	                      L        B 
	Low-to-high ratio = ---- = ---------
	                     t      R  + R
	                      H      A    B