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ICS9248YG-92 Datasheet

  • ICS9248YG-92

  • Mobile Pentium IITM System Clock Chip

  • 14頁(yè)

  • ICS

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Integrated
Circuit
Systems, Inc.
ICS9248-92
TM
Mobile Pentium
II
System Clock Chip
Recommended Application:
The
ICS9248-92
is a fully compliant timing solution for the
Intel mobile 440BX/MX chipset requirements.
General Description:
Features include two strong CPU, seven PCI and eight SDRAM
clocks. Three reference outputs are available equal to the
crystal frequency. Stronger drive CPUCLK outputs typically
provide greater than 1 V/ns slew rate into 20pF loads. This
device meets rise and fall requirements with 2 loads per CPU
output (ie, one clock to CPU and NB chipset, one clock to two
L2 cache inputs).
PWR_DWN# pin allows low power mode by stopping crystal
OSC and PLL stages. For optional power management,
CPU_STOP# can stop CPU (0:1) clocks and PCI_STOP# will
stop PCICLK (0:5) clocks
PCICLK outputs typically provide better than 1V/ns slew rate
into 30pF loads while maintaining 50鹵5% duty cycle. The REF
clock outputs typically provide better than 0.5V/ns slew rates.
The
ICS9248-92
accepts a 14.318MHz reference crystal or
clock as its input and runs on a 3.3V core supply.
Features
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Generates system clocks for CPU, SDRAM, PCI, plus
14.318 MHz REF(0:2), USB, Plus Super I/O
I
2
C serial configuration interface provides output clock
disabling and other functions
MODE input pin selects optional power management
input control pins
Two fixed outputs separately selectable as 24 or 48MHz
2.5V outputs: CPU
3.3V outputs: SDRAM, PCI, REF, 48/24 MHz
No power supply sequence requirements
Uses external 14.318MHz crystal
48 pin 240 mil TSSOP package
Output enable register
for serial port control:
1 = enable
0 = disable
Pin Configuration
Block Diagram
48-Pin TSSOP 240 mil Package
Functionality
Crystal (X1, X2) = 14.31818 MHz
SEL
100/66#
0
Pentium is a trademark on Intel Corporation.
9248-92 Rev E 02/21/01
CPUCLK
(MHz)
66.6
100
PCICLK
(MHz)
33.3
33.3
1
ICS reserves the right to make changes in the device data identified in
this publication without further notice. ICS advises its customers to
obtain the latest version of all device data to verify that any
information being relied upon by the customer is current and accurate.

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