KS8695X Micrel Inc, KS8695X Datasheet - Page 17

• Manufacturer Part Number: KS8695X
• Description: IC SWITCH 10/100 5PORT 208PQFP
• Manufacturer: Micrel Inc

Specifications of KS8695X

• Applications: *
• Mounting Type: Surface Mount
• Package / Case: 208-MQFP, 208-PQFP
• For Use With: KS8695-EVAL - EVAL KIT EXPERIMENTAL KS8695576-1005 - BOARD EVAL EXPERIMENT KS8695X
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Signal Description
System Level Hardware Interfaces
System Clock
The clock to the KS8695X can be supplied by either a 25MHz ±50ppm crystal or by an oscillator. If an oscillator is used it shall
be connected to the X1 input (pin 150) on the KS8695X. If a crystal is used, it shall be connected with a circuit like the one
shown below. The 25MHz input clock is used by an internal PLL to generate the programmable SDOCLK. SDOCLK is the
system clock, and can be programmed from 25MHz to 125MHz using system clock and bus control register at offset 0x0004.
The CPUCLKSEL strap-in option on pin 96 needs to be pulled low for normal operation.
October 2004
KS8695X
Power On Reset Circuit
R
C
V
CC
1kΩ
96
Figure 3. Example of a Reset Circuit
URTSN/
CPUCLKSEL
148
Figure 4. Typical Clock Circuit
22pF
150
RESETN
KS8695X
X1
25MHz
500kΩ
Xtal
KS8695X
X2
17
151
WRSTPLS
22pF
SDOCLK
EROEN/
WRSTO
23
84
85
25MHz to 125MHz
System Reset
R
To System
V
CC
Set WRSTO to
Active Low
To System
To Memory
M9999-102604
Micrel