ICS951464 Datasheet, PDF (1/24 Pages) Integrated Device Technology – Programmable System Clock Chip for ATI RS/RD690 K8TM - based Systems

Programmable System Clock Chip for ATI RS/RD690 K8^TM
- based Systems
ICS951464
Recommended Application:
ATI RS/RD690 systems using AMD K8 processors & SB600
Southbridge
Output Features:
• 2 - 0.7V current-mode differential CPU pairs
• 6 - 0.7V current-mode differential SRC pairs
• 2 - 0.7V current-mode differential ATIG pairs
• 1 - HyperTransport clock seed
• 2 - 48MHz USB clock
• 3 - 14.318MHz Reference clock
Key Specifications:
• CPU outputs cycle-to-cycle jitter < 85ps
• SRC outputs cycle-to-cycle jitter < 125ps
• ATIG outputs cycle-to-cycle jitter < 125ps
• +/- 300ppm frequency accuracy on CPU, SRC & ATIG
clocks
Features/Benefits:
• 3 - Programmable Clock Request pins for SRC and ATIG
clocks
• ATIGCLKs are programmable for frequency
• Spread Spectrum for EMI reduction
• Outputs may be disabled via SMBus
• External crystal load capacitors for maximum frequency
accuracy
Pin Configuration
GNDREF 1
VDDREF 2
X1 3
X2 4
VDD48 5
48MHz_0 6
48MHz_1 7
GND48 8
SMBCLK 9
SMBDAT 10
RESET_IN# 11
SRCCLKT7 12
SRCCLKC7 13
VDDSRC 14
GNDSRC 15
SRCCLKT6 16
SRCCLKC6 17
SRCCLKT5 18
SRCCLKC5 19
SRCCLKT4 20
SRCCLKC4 21
GNDSRC 22
VDDSRC 23
SRCCLKT2 24
SRCCLKC2 25
VDDSRC 26
GNDSRC 27
*CLKREQB# 28
56 FS0/REF0
55 FS1/REF1
54 FS2/REF2
53 **PD
52 VDDHTT
51 HTTCLK0
50 GNDHTT
49 *CLKREQA#
48 CPUCLK8T0
47 CPUCLK8C0
46 VDDCPU
45 GNDCPU
44 CPUCLK8T1
43 CPUCLK8C1
42 VDDA
41 GNDA
40 IREF
39 SRCCLKT0
38 SRCCLKC0
37 GNDSRC
36 VDDSRC
35 ATIGCLKT0
34 ATIGCLKC0
33 VDDATIG
32 GNDATIG
31 ATIGCLKT1
30 ATIGCLKC1
29 *CLKREQC#
56-Pin SSOP/TSSOP
Note: Pins preceeded by * have a 120 Kohm Internal Pull Up resistor
Pins preceeded by ** have a 120 Kohm Internal Pull Down resistor
IDT^TM/ICST^M Programmable System Clock Chip for ATI RS/RD690 K8^TM - based Systems
1
1211B—09/17/09