The square-wave period is determined by the RC time constant of the capacitor C₁ and resistor R₄. The maximum frequency is limited by propagation delay of the device and the capacitance load at the output. The low input bias current allows a lower capacitor value and larger resistor value combination for a given oscillator frequency, which may help to reduce BOM cost and board space. TI recommends that R4 be over several kilo-ohms to minimize loading of the output.