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PDF SC670 Data sheet ( Hoja de datos )
| Número de pieza | SC670 | |
| Descripción | I2C Clock Generator | |
| Fabricantes | International Microcircuits | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SC670 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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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
Page 1 of 12
1 page  
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SC670
I2C Clock Generator for Pentium Notebook Designs.
Approved Product
SERIAL CONTROL REGISTERS (Cont.)
Function Table
Function
Description
Tri-State
Test Mode
Normal SEL=1
Normal SEL=0
CPU
Hi-Z
Tclk/2
66
60
PCI
Hi-Z
Tclk/4
CPU/2
CPU/2
SDRAM
Hi-Z
Tclk/2
CPU
CPU
Outputs
Ref
Hi-Z
Tclk
14.318
14.318
IOAPIC
Hi-Z
Tclk
14.318
14.318
24MHZ
Hi-Z
Tclk/4
24
24
48MHZ
Hi-Z
Tclk/2
48
48
Notes:
1. Tclk is a test clock over driven on the Xin input during test mode.
2. The frequency ratio Fout/Fin for the USB output is 3.35294.
Byte 1: CPU, 48/24 MHz Clock Register (1 = enable, 0 = Stopped)
Bit @Pup Pin# Description
7 1 23 48/24 MHz enable/Stopped
6 1 22 48/24 MHz enable/Stopped
5 x - Reserved
4 x - Reserved
3 1 38 CPUCLK3 enable/Stopped
2 1 39 CPUCLK2 enable/Stopped
1 1 41 CPUCLK1 enable/Stopped
0 1 42 CPUCLK0 enable/Stopped
Byte 2: PCI Clock Register (1 = enable, 0 = Stopped)
Bit @Pup Pin# Description
7 x - Reserved
6 1 8 PCICLK_F enable/Stopped
5 1 16 PCICLK5 enable/Stopped
4 1 14 PCICLK4 enable/Stopped
3 1 13 PCICLK3 enable/Stopped
2 1 12 PCICLK2 enable/Stopped
1 1 11 PCICLK1 enable/Stopped
0 1 9 PCICLK0 enable/Stopped
INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.
MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571
Rev.1.4
6/20/97
Page 5 of 12
5 Page 
www.DataSheet4U.com
SC670
I2C Clock Generator for Pentium Notebook Designs.
Approved Product
PCB LAYOUT SUGGESTION
Via to VDD
Via to GND plane
Via to VCC plane
VCC1
FB1
C3
10µF
IMISC670
C4
C5
C6
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
C12
48
47
46
45
44 C11
43
42
41 C10
40
39
38
37
36
35 C9
34
33
32
31
30
29 C8
28
27
26 C7
25
FB2
VCC2
C13
10µF
This is only a layout recommendation for best performance and lower EMI. The designer may choose a different approach
but C4, C5, C6, C7, C8, C9, C10, C11and C12 (all are 0.1µf) should always be used and placed close to their VDD pins.
INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.
MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571
Rev.1.4
6/20/97
Page 11 of 12
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet SC670.PDF ] | |
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