xr68c681 Exar Corporation, xr68c681 Datasheet - Page 35

• Manufacturer Part Number: xr68c681
• Description: Cmos Dual Channel Uart Duart
• Manufacturer: Exar Corporation

D.8 Explanation of Clock Timing Signals
t
t
Time - IP2 Input
CLK
CTC
f
CLK
- X1/CLK (External) High or Low Time
- Counter/Timer External Clock High or Low
Symbol
- X1/CLK Crystal High or Low Time
Table 11. The XR68C681 Data Sheet presents the following parameter specifications, in the
Parameter
“AC ELECTRICAL CHARACTERISTICS”
f
Input
t
via IP2, IP3, IP4 and IP5
CTC
RTX
- RXC and TXC (External) High or Low Time -
- Counter/Timer External Clock Frequency - IP2
Min.
Limits
Typ.
XR68C681
Max.
Units