XR68C681CJ EXAR [Exar Corporation], XR68C681CJ Datasheet - Page 25

• Manufacturer Part Number: XR68C681CJ
• Description: CMOS Dual Channel UART (DUART)
• Manufacturer: EXAR [Exar Corporation]

Note:
The user also has an option to drive the oscillator circuit with a TTL input signal, in lieu of using a crystal oscillator. If this approach is
used, the TTL must be driven into the X1/CLK pin, and the X2 pin must be left floating.
Figure 7. A Recommended Schematic to Drive Multiple DUARTs From the Same Crystal Oscillator
Figure 6. A Recommended Schematic for the XTAL Oscillator Circuitry
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XR68C681
XR68C681
Figure 7
XR68C681