XR88C681_06 Datasheet, PDF (95/101 Pages) Exar Corporation – CMOS Dual Channel UART (DUART)

XR88C681
C1: 10pF + (Stray < 5pF)
C2: 10pF + (Stray < 5pF)
R1: 100ohm
R2: 100ohm
R1
X1
C1
XR88C681
C2
3.6864MHz
R2
X2
Parallel Resonant Crystal
C1: 10 - 15pF + (Stray < 5pF)
C2: 0 - 5pF + (Stray < 5pF)
X1
C1
XR88C681
C2
X2
3.6864MHz
Parallel Resonant Crystal
X1/CLK
C/T CLK
RXC
TXC
t_CLK
t_CTC
t_RTX
t_CLK
t_CTC
t_RTX
Figure 56. Clock Timing
Rev. 2.11
95