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IMISG748CYB Datasheet

  • IMISG748CYB

  • CPU System Clock Generator

  • 14頁(yè)

  • ETC

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SG748
Low EMI Clock Generator for ALI-M1541 chipset with AGP on Pentium
廬
Boards.
Approved Product
PRODUCT FEATURES
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Supports Pentium ,Pentium II, M2 & K6 CPUs.
Designed to the ALi M1541 specification
Supports Synchronous and Asynchronous PCI.
4 CPU clocks
3 AGP clocks
Up to 12 SDRAM clocks for 3 DIMs
6 PCI synchronous clocks
Optional common or mixed supply mode:
(VDD = VDDP = VDDC = 3.3V) or
(VDD = VDDP = 3.3V, VDDC = 2.5V)
< 250ps skew among CPU or SDRAM clocks
< 250ps 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
48 MHz for USB support
Internal Crystal Load Capacitors
48-pin SSOP package
Spread Spectrum Technology for EMI reduction
廬
廬
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
60
66.8
50
75
75
83.3
90.0
100
AGP
60
66.8
50
75
50
55.33
60.0
66.6
PCI
30
33.4
25
37.5
25
27.77
30.0
33.3
CONNECTION DIAGRAM
IMISG748
VDD
REF/SW15
VSS
XIN
XOUT
VDDP
PCI_F/S1
PCI0/S2
VSS
PCI1
PCI2
PCI3
PCI4
VDDP
PCI5/SDIN
VSS
CPU_STP#/SDRAM11
PCI_STP#/SDRAM10
VDDS
AGP_STP#/SDRAM9
PWR_DWN#/SDRAM8
VSS
SDATA
SCLK
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
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BLOCK DIAGRAM
XIN
REF
XOUT
REF
VDDC
SW15
PCI_STP#
CPU_STP#
4
VDDP
4
CPU (0:3)
dly
PWR_DWN#
AGP_STP#
S2
S1
S0
MODE
SDIN
PCI (1:4)
PCI (0_F)
3
VDDS
12
VDDS
AGP (0)
SDRAM (0:11)
VDDA
AGP1
AGP2
VSS
CPU0
CPU1
VDDC
CPU2
CPU3
VSS
SDRAM0
SDRAM1
VDDS
SDRAM2
SDRAM3
VSS
SDRAM4
SDRAM5
VDDS
SDRAM6
SDRAM7
VSS
48MHZ / S0
AGP0 / MODE
PCI5
VDDP
AGP (1:2)
VDDA
SDATA
SCLK
PLL2
48 MHz
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 14

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