ICS951413 Datasheet, PDF (1/23 Pages) Integrated Circuit Systems – Programmable System Clock Chip for ATI RS400 P4-based Systems

Integrated
Circuit
Systems, Inc.
ICS951413
Programmable System Clock Chip for ATI RS400 P4^TM-based Systems
Recommended Application:
ATI RS400 systems using Intel P4^TM processors
Output Features:
• 6 - Pairs of SRC/PCI Express* clocks
• 2 - Pairs of programmable SRC/PCI Express (ATIG)
clocks
• 3 - Pairs of Intel P4 clocks
• 3 - 14.318 MHz REF clocks
• 1 - 48MHz USB clock
• 1 - 33 MHz PCI clock seed
Features/Benefits:
• 2 - Programmable Clock Request pins for SRC clocks
• Supports CK410 or CK409 frequency table mapping
• Spread Spectrum for EMI reduction
• Outputs may be disabled via SMBus
• External crystal load capacitors for maximum
frequency accuracy
Key Specifications:
• CPU outputs cycle-cycle jitter < 85ps
• SRC output cycle-cycle jitter <125ps
• PCI outputs cycle-cycle jitter < 250ps
• +/- 300ppm frequency accuracy on CPU & SRC clocks
Functionality - (CK410# = 0)
FS_C¹ FS_B¹ FS_A¹
CPU
MHz
SRC
MHz
PCI
MHz
0
0 266.66 100.00 33.33
0
1 133.33 100.00 33.33
1
0 200.00 100.00 33.33
1 166.66 100.00 33.33
0
0 333.33 100.00 33.33
1
1 100.00 100.00 33.33
1
0 400.00 100.00 33.33
1
RESERVED
REF USB
MHz MHz
14.318 48.000
14.318 48.000
14.318 48.000
14.318 48.000
14.318 48.000
14.318 48.000
14.318 48.000
14.318 48.000
Functionality - (CK410# = 1)
FS_C¹
Byte6 FS_B¹ FS_A¹
CPU
MHz
bit5
SRC
MHz
PCI
MHz
REF
MHz
USB
MHz
0 0 100.00 100.00 33.33 14.318 48.000
0
1
0 200.00 100.00 33.33 14.318 48.000
0 1 133.33 100.00 33.33 14.318 48.000
1 1 166.67 100.00 33.33 14.318 48.000
0 0 200.00 100.00 33.33 14.318 48.000
1
1
0 400.00 100.00 33.33 14.318 48.000
0 1 266.67 100.00 33.33 14.318 48.000
1 1 333.33 100.00 33.33 14.318 48.000
1. FS_C, FS_B and FS_A are low-threshold inputs. Please see the V_{IL_FS} and V_{IH_FS}
specifications in the Input/Supply/Common Output Parameters Table for correct values.
Pin Configuration
X1 1
X2 2
VDD48 3
USB_48MHz 4
GND 5
VTT_PWRGD#/PD 6
SCLK 7
SDATA 8
**FS_C 9
**CLKREQA# 10
**CLKREQB# 11
SRCCLKT7 12
SRCCLKC7 13
VDDSRC 14
GNDSRC 15
SRCCLKT6 16
SRCCLKC6 17
SRCCLKT5 18
SRCCLKC5 19
GNDSRC 20
VDDSRC 21
SRCCLKT4 22
SRCCLKC4 23
SRCCLKT3 24
SRCCLKC3 25
GNDSRC 26
ATIGCLKT1 27
ATIGCLKC1 28
56 VDDREF
55 GND
54 **FS_A/REF0
53 **FS_B/REF1
52 **TEST_SEL/REF2
51 VDDPCI
50 **CK410#/PCICLK0
49 GNDPCI
48 *CPU_STOP#
47 CPUCLKT0
46 CPUCLKC0
45 VDDCPU
44 GNDCPU
43 CPUCLKT1
42 CPUCLKC1
41 CPUCLKT2_ITP
40 CPUCLKC2_ITP
39 VDDA
38 GNDA
37 IREF
36 GNDSRC
35 VDDSRC
34 SRCCLKT0
33 SRCCLKC0
32 VDDATI
31 GNDATI
30 ATIGCLKT0
29 ATIGCLKC0
Note: Pins preceeded by '**' have a 120 Kohm Internal Pull Down resistor
Pins preceeded by '*' have a 120 Kohm Internal Pull Up resistor
56-pin SSOP & TSSOP
0929C—03/07/05
*Other names and brands may be claimed as the property of others.