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UC1845: how to pick RT/CT values

Part Number: UC1845


The UC1845 datasheet section RT/CT provides a recommended range for timing resistor R_RT (5Kohm-100Kohm) and timing capacitor C_CT (1nF-100nF), so does it mean the recommended maximum oscillating frequency f_OSC is 1.72/(5Kohm*1nF) = 344KHz? If I want to obtain higher frequency, say 450KHz, is it recommended to keep 5Kohm RT and reduce CT, or keep 1nF CT and reduce RT? Thank you.