Datasheet
RD890 System Clock for AMD-based Servers
ICS932S820C
Recommended Application:
SR5690/SR5670 Series IGP Express Server Clock
Features/Benefits:
•
•
•
Spread Spectrum for EMI reduction
Outputs may be disabled via SMBus
Output Features:
External crystal load capacitors for maximum
frequency accuracy
•
Low power differential outputs with integrated series
resistors for Zo=50ohm systems
•
•
•
•
•
4 - Differential 200MHz CPU pairs
2 - Differential 100MHz HT3 pairs
14 - Differential PCIe Gen2 SRC pairs
1 - Differential non-spread SATA clock
2 - 48MHz USB clocks (180 degrees out of phase for
EMI reduction)
2 - SIO clocks (selectable 48MHz or 24MHz). 180
degrees out of phase for EMI reduction.
2 - 14.318MHz Reference clock outputs
Key Specifications:
•
•
•
•
•
•
CPU output cycle-to-cycle jitter < 100ps
SRC output cycle-to-cycle jitter < 125ps
48MHz output cycle-to-cycle jitter < 130ps
SIO output cycle-to-cycle jitter < 150ps
SRC output phase jitter < 3.1ps rms (PCIe Gen2)
+/- 50ppm frequency accuracy on all clocks, assuming
REF is trimmed to 0 ppm)
•
•
Table 1: Functionality
CPU
MHz
HTT
MHz
SRC
MHz
REF
MHz
USB
MHz
48.00
DOT
MHz
96.00
SATA
SIO
200.00 100.00 100.00 100.00 14.318
24/48
Pin Configuration
72 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55
VDDSATA_3.3 1
SATAC_LPRS 2
SATAT_LPRS 3
GNDSATA 4
CPUKG0C_LPRS 5
CPUKG0T_LPRS 6
CPUKG1C_LPRS 7
CPUKG1T_LPRS 8
VDDCPU_3.3 9
54 SRC6T_LPRS
53 SRC6C_LPRS
52 SRC5T_LPRS
51 SRC5C_LPRS
50 VDDSRC_3.3
49 GNDSRC
48 SRC4T_LPRS
47 SRC4C_LPRS
46 SRC3T_LPRS
45 SRC3C_LPRS
44 SRC2T_LPRS
43 SRC2C_LPRS
42 GNDSRC
932S820C
GNDCPU 10
CPUKG2C_LPRS 11
CPUKG2T_LPRS 12
CPUKG3C_LPRS 13
CPUKG3T_LPRS 14
RESTORE# 15
41 VDDSRC_3.3
40 SRC1T_LPRS
39 SRC1C_LPRS
38 SRC0T_LPRS
37 SRC0C_LPRS
HTT0C_LPRS 16
HTT0T_LPRS 17
GNDHTT 18
19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36
* Indicates that pin has 120Kohm internal pullup resistor.
72-pin MLF
IDT® RD890 System Clock for AMD-based Servers
1671—02/28/11
1