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Cypress Semiconductor Electronic Components Datasheet

C9812 Datasheet

Low EMI Clock Generator

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C9812 pdf
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APPROVED PRODUCT
C9812
Low EMI Clock Generator for Intel810E Chipset Systems
Product Features
Intel’s 810E clock solution
3 copies of CPU Clock (CPU[0:1] and CPU_ITP)
9 copies of SDRAM Clock (SDRAM[0:7] and DCLK)
8 copies of PCI Clock
2 copies of 3V66 Clock
2 copies of APIC Clock, synchronous to PCI Clock
1 REF Clock
1 USB Clock (Non SSC)
1 DOT Clock (Non SSC)
Power Down Feature
Spread Spectrum Support
SMBUS Support for turning off unused clocks
Block Diagram
Frequency Table (MHz)
SEL2 SEL1 SEL0 CPU SDRAM
PCI
X 0 0 Tristate Tristate Tristate
X01
Test mode (see table2)
0 1 0 66.6 100
33.3
0 1 1 100 100
33.3
1
1
X 133.3
100
33.3
Table 1
Note: The following clocks remain fixed frequencies
except in Test Mode.
3V66=66.6MHz, USB/DOT=48MHz, REF=14.318MHz
and IOAPIC=33.3MHz.
Pin Configuration
XIN
XOUT
36pF
300K
36pF
SCLK
SDATA
s2
Rin
i2c-clk
i2c-data
ioapic
cpu
SEL1
SEL0
PD#
VDD
VDD
s1
sdram
s0
pwr_dwn#
66m
PLL1
Rin
pci
48
PD#
i2c-clk
i2c-data
PLL2
Fig.1
VDD
1
REF / SEL2
VDDI
2 IOAPIC(0:1)
VDDC
3 CPU(0:2)
VDDS
9 SDRAM(0:7), DCLK
VDD
2 3V66(0:1)
VDD
8 PCI(0:7)
VDD
1 DOT
VDD
1 USB
SEL2/REF
VDD
XIN
XOUT
VSS
VSS
3V660
3V661
VDD
VDD
PCI0_ICH
PCI1
PCI2
VSS
PCI3
PCI4
VSS
PCI5
PCI6
PCI7
VDD
VDDA
VSSA
VSS
USB
DOT
VDD
SEL0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
56 VSS
55 IOAPIC0
54 IOAPIC1
53 VDDI
52 CPU0
51 VDDC
50 CPU1
49 CPU2_ITP
48 VSS
47 VSS
C
46
45
SDRAM0
SDRAM1
9 44 VDDS
8 43 SDRAM2
1
42
41
SDRAM3
VSS
2 40 SDRAM4
39 SDRAM5
38 VDDS
37 SDRAM6
36 SDRAM7
35 VSS
34 DCLK
33 VDD
32 PD#
31 SCLK
30 SDATA
29 SEL1
Cypress Semiconductor Corporation
525 Los Coches St.
Milpitas, CA 95035. Tel: 408-263-6300, Fax: 408-263-6571
http://www.cypress.com
Document#: 38-07053 Rev. **
05/03/01
Page 1 of 18


Cypress Semiconductor Electronic Components Datasheet

C9812 Datasheet

Low EMI Clock Generator

No Preview Available !

C9812 pdf
APPROVED PRODUCT
C9812
Low EMI Clock Generator for Intel810E Chipset Systems
Pin Description
PIN No.
Pin Name PWR I/O TYPE
Description
1
SEL2/REF
VDD I/O
3.3V 14.318 MHz clock output.
This pin also serves as the select strap (associates with SEL0 &
1, see app. note page 5) for clock frequencies during power up.
Refer to Table 1 for detail. This pin has an internal pull-down
(Typ. 70K).
3 XIN VDD I OSC1 14.318MHz Crystal input
4
XOUT
VDD O
14.318MHz Crystal output
11, 12, 13,
15, 16, 18,
19, 20
PCI0/ICH
PCI(1..7)
VDD O
3.3V PCI clock outputs
7, 8
3V66(0,1)
VDD O
3.3V Fixed 66.6 MHz clock outputs
25 USB VDD O 3.3V Fixed 48 MHz clock outputs
26 DOT VDD O 3.3V Fixed 48 MHz clock outputs
28, 29
SEL(0,1)
VDD I
3.3V LVTTL compatible inputs for logic selection. Has an
internal pull-up (Typ. 250K)
30
SDATA
VDD I
I²C compatible SDATA input. Has an internal pull-up (>100K)
31
SCLK
VDD I
I²C compatible SCLK input. Has an internal pull-up (>100K)
32 PD# VDD I 3.3V LVTTL compatible input. Device enters powerdown mode
When held LOW. Has an internal pull-up (>100K)
34
DCLK
VDD O
3.3V output running 100MHz
36, 37, 39, SDRAM(7..0) VDDS O
3.3V output running 100MHz. All SDRAM outputs can be turned
40, 42, 43,
off through SMBUS.
45, 46
49, 50, 52
CPU(2)_ITP, VDDC O
CPU(1,0)
2.5V Host bus clock outputs. 66, 100 or 133MHz depending on
state of SEL(2..0)
54, 55
IOAPIC(1,0) VDDI O
2.5V clock outputs running rising edge synchronous with the
PCI clock.
2, 9, 10, 21, VDD
27, 33
-
3.3V Power Supply
22 VDDA -
Analog circuitry 3.3V Power Supply
23 VSSA
-
Analog circuitry power supply Ground pins.
51, 53
VDDC, VDDI
-
2.5V Power Supply’s
5, 6,14, 17, VSS
24, 35, 41,
- - Common Ground pins.
47, 48, 56
38, 44
VDDS
- - 3.3V power support for SDRAM clock output drivers.
A bypass capacitor (0.1µF) should be placed as close as possible to each positive power pin. If these bypass capacitors
are not close to the pins their high frequency filtering characteristic will be cancelled by the lead inductance of the traces.
Cypress Semiconductor Corporation
525 Los Coches St.
Milpitas, CA 95035. Tel: 408-263-6300, Fax: 408-263-6571
http://www.cypress.com
Document#: 38-07053 Rev. **
05/03/01
Page 2 of 18


Part Number C9812
Description Low EMI Clock Generator
Maker Cypress Semiconductor
Total Page 18 Pages
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