Pin 5 :  10nF capacitor

Capacitor:  100nF
R2: 4.7k ohm + 2.2k ohm+ 100 ohm= 7k ohm
R1: 100 ohm + 100 ohm = 200 ohm

Frequency: 1000 Hz
Period: 999.81us

+ width:  472.17us
+ duty cycle: 47.23%

– width: 527.64us
– duty cycle: 52.77%