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International Microcircuits - I2C Clock Generator

Numéro de référence SC670
Description I2C Clock Generator
Fabricant International Microcircuits 
Logo International Microcircuits 





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SC670 fiche technique
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SC670
I2C Clock Generator for Pentium Notebook Designs.
Approved Product
PRODUCT FEATURES
Supports Pentium & Pro CPUs.
4 CPU clocks up to 8 loads.
Up to 8 SDRAM clocks for 2 DIMs.
Supports Power Savings Frequencies.
7 PCI synchronous clocks.
Optional common or mixed supply mode:
(Vdd = Vddq3 = Vddq2 = 3.3V) or
(Vdd = Vddq3 = 3.3V, Vddq2 = 2.5V)
< 250ps skew CPU and SDRAM clocks.
< 250ps skew among PCI clocks.
I2C 2-Wire serial interface
Programmable registers featuring:
- enable/disable each output pin
- mode as tri-state, test, or normal
- 24/48 MHz selections
1 IOAPIC clock for multiprocessor support.
48-pin SSOP package
BLOCK DIAGRAM
Xin
Xout
REF
OSC
Vddq2
SDATA
SDCLK
SEL
PLL1
PCI_STOP#
CPU_STOP#
PWR_DWN#
MODE
Vddq2
Vddq3
dly
PLL2
3
REF0:1
IOAPIC0
4
CPUCLK0~3
8
SDRAM0~7
6
PCICLK0~5
PCICLK_F
48/24MHZ
48/24MHZ
FREQUENCY TABLE
SEL CPU
PCI
0 60.0
30.0
1 66.6
33.3
CONNECTION DIAGRAM
REF1
REF0
Vss
Xin
Xout
MODE
Vddq3
PCICLK_F
PCICLK0
Vss
PCICLK1
PCICLK2
PCICLK3
PCICLK4
Vddq3
PCICLK5
Vss
SEL
SDATA
SDCLK
Vddq3
48/24MHZ
48/24MHZ
Vss
IMISC670
1 48
2 47
3 46
4 45
5 44
6 43
7 42
8 41
9 40
10 39
11 38
12 37
13 36
14 35
15 34
16 33
17 32
18 31
19 30
20 29
21 28
22 27
23 26
24 25
Vdd
N/C (See note 1)
Vddq2
IOAPIC0
PWR_DWN#
Vss
CPUCLK0
CPUCLK1
Vddq2
CPUCLK2
CPUCLK3
Vss
SDRAM0
SDRAM1
Vddq3
SDRAM2
SDRAM3
Vss
SDRAM4
SDRAM5
Vddq3
SDRAM6/CPU_STOP#
SDRAM7/PCI_STOP#
Vdd
Note 1: N/C is a no connect pin. IMI product does not
require CPU 3.3_2.5# select line to operate properly at
2.5 volts. This pin may be connected externally to Vdd
or Vss.
INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.
MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571
Rev.1.4
6/20/97
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