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IMISG543CYB Datasheet

  • IMISG543CYB

  • CPU System Clock Generator

  • 15頁(yè)

  • ETC

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SG543
I
2
C Clock Generator for 3 DIMM, Pentium
廬
, Pentium
廬
II & Pro Boards.
Approved Product
PRODUCT FEATURES
FREQUENCY TABLE (MHz)
S2
0
0
0
0
1
1
1
1
S1
0
0
1
1
0
0
1
1
S0
0
1
0
1
0
1
0
1
CPU
50.11
75.17
83.52
69.80
83.52
75.17
60.14
66.82*
PCI
25.06
30.07
41.76
34.90
33.41
37.59
30.07
33.41*
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
T
Supports Pentium
廬
,Pentium
廬
II, M2, & K6 CPUs.
Designed to the 440LX specification
Supports Synchronous and Asynchronous PCI.
4 CPU / AGP clocks
Up to 12 SDRAM clocks for 3 DIMMs.
7 PCI synchronous clocks.
Optional common or mixed supply mode:
(VDD = VDDC = VDDP = VDDSD = VDDI = 3.3V)
or (VDD = VDDC = VDDSD = VDDP = 3.3V, VDDI
= VDDC = 2.5)
< 250 pS skew among CPU or SDRAM clocks.
< 250 pS skew among PCI clocks.
2
I C 2-Wire serial interface
Programmable registers featuring:
- Jumperless frequency selection
- enable/disable each output pin
- mode as tri-state, test, or normal
Power Management Capability.
IOAPIC clocks for multiprocessor support.
48 MHz for USB support
Internal Crystal Load Capacitors.
48-pin SSOP package
Spread Spectrum Technology for EMI reduction
* Supports spread spectrum
CONNECTION DIAGRAM
VDD
REF0
VSS
XIN
XOUT
VDDP
PCI_F/ S1
PCI0 / S2
VSS
PCI1
PCI2
PCI3
PCI4
VDDP
PCI5 / PS#
VSS
SDRAM11
SDRAM10
VDDSD2
SDRAM9
SDRAM8
VSS
SDATA
SDCLK
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
2
BLOCK DIAGRAM
REF
XIN
XOUT
VDDI
REF0
REF1
IOAPIC
VDDC
CS#
PS#
dly
B
B
4
VDDP
CPU (0:3)
PCI (0:5)
PCI_F
S2
S1
S0
6
PLL1
VDDSD [0:2]
MODE
B
12
SDRAM(0:11)
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
VDDI
IOAPIC
REF1 / CS#
VSS
CPU0
CPU1
VDDC
CPU2
CPU3
VSS
SDRAM0
SDRAM1
VDDSD0
SDRAM2
SDRAM3
VSS
SDRAM4
SDRAM5
VDDSD1
SDRAM6
SDRAM7
VSS
48 MHz / S0
24 MHz / Mode
SDATA
SDCLK
48 MHz
PLL2
24 MHz
NOTE : Purchase of I C components of International Microcircuits,
Inc. or one of its sublicensed Associated Companies conveys a
2
license under the Phillips I C Patent Rights to use these components
2
2
in an I C system, provided that the system conforms to the I C
Standard Specification as defined by Phillips.
INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.
MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571
Rev.1.7
8/14/98
Page 1 of 15

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