ics9248-65 Integrated Device Technology, ics9248-65 Datasheet - Page 2

• Manufacturer Part Number: ics9248-65
• Description: Frequency Timing Generator For Pentium Iisystems
• Manufacturer: Integrated Device Technology

General Description
Pin Descriptions
Pin number Pin name
8,10,11,12,13,
6,14, 20, 26,
15,16,18,19
3, 9, 17, 24,
33, 45, 48
21,22,23
36,37,40
28, 34
29,30
35,39
38,41
1,2
25
27
31
32
42
43
44
46
47
4
5
7
PCICLK (1:9)
GNDLCPU/2
VDDLCPU/2
IOAPIC(0:1)
VDDIOAPIC
PCICLK_F
GNDLCPU
VDDLCPU
SPREAD#
133/100#
SEL (0:1)
CPUCLK
48 MHz
CPU/2
3V66
VDD
GND
REF
(0:2)
SEL
PD#
X1
X2
Output
Output
Output
Output
Output
Output
Output
Output
Output
0utput
Type
Power
Power
Power
Power
Power
Power
Power
Input
Input
Input
Input
3.3V, 14.318 MHz reference clock output.
3.3 V power for clock outputs.
14.318 MHz crystal input
14.318 MHz crystal output
Ground for clock outputs
3.3 V free running PCI clock output, will not be stopped by the PCI_STOP#
3.3 V PCI clock outputs, generating timing requirements for
3.3 V 66 MHz clock output, fixed frequency clock typically used with AGP
Control for the frequency of clocks at the CPU output pins. If logic "0" is used the
100 MHz frequency is selected. If Logic "1" is used, the 133 MHz frequency is
selected. The PCI clock is multiplexed to run at 33.3 MHz for both selected cases.
3.3 V 48 MHz clock output, fixed frequency clock typically used with USB
devices
Frequency select pin , logic input.
enable. Active high = spread spectrum clocking disable.
Asynchronous active low input pin used to power down the device into a low
power state. The internal clocks are disabled and the VCO and the crystal are
stopped.
Ground for the CPU and Host clock outputs
2.5 V CPU and Host clock outputs
2.5 V power for the CPU and Host clock outputs
Ground for the CPU and Host clock outputs
Output running at 1/2 CPU clock frequency.Synchronous to the CPU outputs.
2.5 V power for the CPU/2 clock outputs
2.5V fixed 16.6 MHz IOAPIC clock outputs
2.5V power for IOAPIC clock
Power-on spread spectrum enable option. Active low = spread spectrum clocking
Power Groups:
Description
ICS9248-65