DATASHEET
PCIe Gen2 and QPI Clock for Intel-Based Servers
ICS932S421B
Key Specifications:
Recommended Application:
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PCIe Gen 2 compliant SRC outputs
PCIe Gen 2 & QPI compliant CK410B+ clock for Intel-based
servers
QPI & FBD 2 compliant CPU clocks
CPU cycle-cycle jitter: < 50ps
SRC cycle-cycle jitter: < 125ps
PCI cycle-cycle jitter: < 500ps
CPU output skew: < 50ps
Output Features:
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4 - 0.7V current-mode differential CPU pairs
5 - 0.7V current-mode differential SRC pair
4 - PCI (33MHz)
3 - PCICLK_F, (33MHz) free-running
1 - 48MHz
SRC output skew: < 250ps
100ppm frequency accuracy on all outputs
2 - REF, 14.318MHz
Functionality
CPU
MHz
SRC
MHz
PCI
MHz
REF
MHz
USB
MHz
FS_C1 FS_B1 FS_A2
Features/Benefits:
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0
1
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0
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0
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1
266.67
133.33
200.00
166.67
333.33
100.00
400.00
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Supports spread spectrum modulation, 0 to -0.5%
down spread
100.00 33.33 14.32
48.00
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Uses external 14.318MHz crystal and external load
capacitors for low ppm synthesis error
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CPU clocks independent of SRC/PCI clocks
D2/D3 SMBus address
Reserved
1. FS_B and FS_C are three-level inputs. Please see VIL_FS and VIH_FS specifications in
the Input/Supply/Common Output Parameters Table for correct values.
Also refer to the Test Clarification Table.
2. FS_A is a low-threshold input. Please see the VIL_FS and VIH_FS
specifications in the Input/Supply/Common Output Parameters Table for correct values.
Pin Configuration
VDDPCI 1
GNDPCI 2
56 FS_C/TEST_SEL
55 REF0
PCICLK0 3
54 REF1
PCICLK1 4
PCICLK2 5
53 VDDREF
52 X1
PCICLK3 6
51 X2
GNDPCI 7
VDDPCI 8
PCICLK_F0 9
PCICLK_F1 10
PCICLK_F2 11
VDD48 12
50 GNDREF
49 FS_B/TEST_MODE
48 FS_A
47 VDDCPU
46 CPUCLKT0
45 CPUCLKC0
44 VDDCPU
43 CPUCLKT1
42 CPUCLKC1
41 GNDCPU
40 CPUCLKT2
39 CPUCLKC2
38 VDDCPU
37 CPUCLKT3
36 CPUCLKC3
35 VDDA
48MHz 13
GND48 14
VDDSRC 15
SRCCLKT0 16
SRCCLKC0 17
SRCCLKC1 18
SRCCLKT1 19
GNDSRC 20
SRCCLKT2 21
SRCCLKC2 22
SRCCLKC3 23
SRCCLKT3 24
VDDSRC 25
SRCCLKT4 26
SRCCLKC4 27
VDDSRC 28
34 GNDA
33 IREF
32 NC
31 Vtt_PwrGd#/PD
30 SDATA
29 SCLK
56-pin SSOP & TSSOP
IDTTM PCIe Gen2 and QPI Clock for Intel-Based Servers
1340G—01/26/10
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