Standard best practices for PCB layout apply to routing the TLC3555-Q1. A 0.1μF decoupling capacitor, preferably in parallel with a 1μF electrolytic bulk decoupling capacitor, must be placed as close as possible to the TLC3555-Q1 supply pins. The capacitor used for the time delay must be placed as close to the discharge pin as possible. A ground plane on the bottom layer can provide better noise immunity and signal integrity.

For circuits operating at or in excess of 100kHz, parasitic capacitance can significantly impact circuit performance and must be carefully controlled. Increase space between adjacent traces where possible, cut out power and ground planes above and below critical traces, and minimize the use of vias on critical traces. Shorter traces have less capacitance due to capacitance per unit length, so minimize component-to-component trace lengths for the timing resistor (or resistors) and timing capacitor. Simulate, calculate, or manually measure board capacitance before selecting a timing capacitor value because the effective timing capacitance C_T is the sum of the deliberate timing capacitance and parasitic capacitance. Be aware that the timing capacitor value as measured at the frequency of interest can differ from the nominal value; confirm with an LCR meter.