ics9248-102 Integrated Device Technology, ics9248-102 Datasheet - Page 2

• Manufacturer Part Number: ics9248-102
• Description: Motherboard Single Chip Clock Solution For Pentium Ii/iii And K6 Processors, Using Sis540/sis630 Style Chipset
• Manufacturer: Integrated Device Technology

General Description
The ICS9248-102 is the single chip clock solution for
Desktop/Notebook designs using the SIS 540/630 style
chipset. It provides all necessary clock signals for such a
system.
Spread spectrum may be enabled through I
Spread spectrum typically reduces system EMI by 8dB to
10dB. This simplifies EMI qualification without resorting to
board design iterations or costly shielding. The ICS9248-
102
employs a proprietary closed loop design, which tightly
controls the percentage of spreading over process and
temperature variations.
Serial programming I
stop clock programming and frequency selection.
Pin Configuration
ICS9248-102
3, 10, 16, 22, 33,
9, 11, 12, 13, 14
1, 6, 15, 19, 27,
PIN NUMBER
41, 40, 38, 37,
35, 34, 32, 31,
29, 28, 21, 20,
30, 36, 42
46, 45, 43
39, 44
18, 17
23
24
25
26
47
48
2
4
5
7
8
CPUCLK [0:2]
CPU2.5_3.3#
PCICLK [2:6]
PIN NAME
24_48MHz
VDDLCPU
2
PCICLK0
PCICLK1
C interface allows changing functions,
SDRAM
SDATA
48MHz
SCLK
REF0
REF0
GND
VDD
FS3
FS1
FS2
FS0
X1
X2
TYPE
PWR
PWR
PWR
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
IN
IN
IN
IN
IN
IN
IN
IN
2
C programming.
3.3V Power supply for SDRAM output buffers, PCI output buffers,
reference output buffers and 48MHz output
14.318 MHz reference clock.
Frequency select pin.
Ground pin for 3V outputs.
Crystal input,nominally 14.318MHz.
Crystal output, nominally 14.318MHz.
Frequency select pin.
PCI clock outputs.
Frequency select pin.
PCI clock outputs.
PCI clock outputs.
SDRAM clock outputs
Data input for I2C serial input, 5V tolerant input
Clock input of I2C input, 5V tolerant input
Voltage select 2.5V when high - 3.3V when low
Clock output for super I/O/USB default is 24MHz
Frequency select pin.
48MHz output clock
CPU clock outputs.
Power pin for the CPUCLKs. 2.5V
14.318 MHz reference clock.
2
Power Groups
VDDREF = REF [1:0], X1, X2
VDDPCI = PCICLK_F, PCICLK [9:0]
VDDSDR = SDRAM [11:0], supply for PLL core,
VDD48 = 48MHz, 24MHz
VDDLIOAPIC = IOAPIC_F
VDDLCPU = CPUCLK_F [2:1]
DESCRIPTION