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ICS9250YF-13 Datasheet

  • ICS9250YF-13

  • Frequency Generator & Integrated Buffers for PENTIUM/ProTM

  • 564.82KB

  • 15頁

  • ICS

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Integrated
Circuit
Systems, Inc.
ICS9250-13
Frequency Generator & Integrated Buffers for PENTIUM/Pro
TM
General Description
The
ICS9250-13
generates all clocks required for high speed
RISC or CISC microprocessor systems such as Intel PentiumPro
or Cyrix. Eight different reference frequency multiplying factors
are externally selectable with smooth frequency transitions.
Spread spectrum may be enabled through I
2
C programming.
Spread spectrum typically reduces system EMI by 8dB to
10dB. This simplifies EMI qualification without resorting to
board design iterations or costly shielding. The
ICS9250-13
employs a proprietary closed loop design, which tightly
controls the percentage of spreading over process and
temperature variations.
Features
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3.3V outputs: SDRAM, PCI, REF, 48/24MHz
2.5V or 3.3V outputs: CPU
20 ohm CPU clock output impedance
20 ohm PCI clock output impedance
Skew from CPU (earlier) to PCI clock - 1 to 4 ns,
center 2.6 ns.
No external load cap for C
L
=18pF crystals
鹵250 ps CPU, PCI clock skew
400ps (cycle to cycle) CPU jitter
Smooth frequency switch, with selections from
50 to 83.3 MHz CPU.
I
2
C interface for programming
2ms power up clock stable time
Clock duty cycle 45-55%.
56 pin 300 mil SSOP package
3.3V operation, 5V tolerant input.
440LX/EX type chipset Motherboard single chip
clock solution.
Block Diagram
Recomended Application:
Pin Configuration
Power Groups
VDDREF = REF (0:1), X1, X2
VDDPCI = PCICLK_F, PCICLK(0:5)
VDDSDR = SDRAM (0:11), supply for PLL core,
VDD48 = 24MHz, 48MHz
VDDLIOAPIC = IOAPIC
VDDL2CPU = CPUCLK (0:3)
9250-13 Rev A 3/25/99
56-Pin SSOP
* Internal Pull-up Resistor of
120K to VDD on indicated inputs
Pentium is a trademark of Intel Corporation
I
2
C is a trademark of Philips Corporation
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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