ICS9248-134 Datasheet, PDF (1/13 Pages) Integrated Circuit Systems – Frequency Timing Generator for PENTIUM II/III Systems

Integrated
Circuit
Systems, Inc.
ICS9248-134
Frequency Timing Generator for PENTIUM II/III Systems
Recommended Application:
For Intel Camino Style Chipsets
Output Features:
• 3 - CPUs @ 2.5V, up to 180MHz.
• 1 - CPU/2 @ 2.5V.
• 3 - IOAPIC @ 2.5V, PCI or PCI/2
• 3 - 3V66MHz @ 3.3V.
• 11 - PCIs @ 3.3V
• 1 - 48MHz, @ 3.3V fixed
• 1 - 24/48MHz, @ 3.3V
Features:
• Support power management: Power down Mode
from I²C programming.
• Spread spectrum for EMI control
± 0.25% center spread).
• Uses external 14.318MHz crystal
Key Specifications:
• CPU Output Jitter: <250ps
• IOAPIC Output Jitter: <500ps
• 48MHz, 3V66, PCI Output Jitter: <500ps)
X1
X2
SEL24_48#
FREQ_APIC
SDATA
SCLK
FS (4:0)
PD#
Block Diagram
PLL2
XTAL
OSC
PLL1
Spread
Spectrum
/2
CPU
DIVDER
/2
Control
Logic
Config.
Reg.
IOAPIC
DIVDER
PCI
DIVDER
3V66
DIVDER
48MHz
24_48MHz
REF (1:0)
CPUCLK (2:0)
CPU/2
IOAPIC (2:0)
PCICLK (9:0)
PCICLK_F
3V66 (2:0)
9248-134 Rev A 8/22/00
Pin Configuration
GND
1
REF0
2
*SEL24_48#/REF1
3
VDDREF
4
X1
5
X2
6
GND
7
*FS0/PCICLK_F
8
*FS1/PCICLK0
9
VDDPCI
10
*FS2/PCICLK1
11
*FS3/PCICLK2
12
GND
13
PCICLK3
14
PCICLK4
15
VDDPCI
16
PCICLK5
17
PCICLK6
18
GND
19
PCICLK7
20
PCICLK8
21
PCICLK9
22
VDDPCI
23
PD#
24
48
VDDL
47
IOAPIC0
46
IOAPIC1
45
GND
44
IOAPIC2
43
VDDL
42
CPU/2
41
GND
40
CPUCLK0
39
VDDL
38
CPUCLK1
37
CPUCLK2
36
GND
35
VDD66
34
3V66_0
33
3V66_1
32
3V66_2
31
GND66
30
SDATA
29
SCLK
28
VDD48
27
48MHz/FS4*
26
24_48MHz
25
GND48
48-pin SSOP
*120K ohm pull-up to VDD on indicated inputs.
Functionality
FS4 FS3 FS2 FS1 FS0 CPU PCI 3V 66 IOAPIC
0 0 0 0 0 103.00 34.33 68.67 17.17
0 0 0 0 1 105.00 35.00 70.00 17.50
0 0 0 1 0 100.45 33.483 66.967 16.742
0 0 0 1 1 100.90 33.63 67.27 16.82
0 0 1 0 0 107.10 35.700 71.400 17.850
0 0 1 0 1 109.00 36.33 72.67 18.17
0 0 1 1 0 112.00 37.34 74.67 18.67
0 0 1 1 1 114.00 28.50 57.00 14.25
0 1 0 0 0 116.00 29.00 58.00 14.50
0 1 0 0 1 118.00 29.50 59.00 14.75
0 1 0 1 0 133.30 33.33 66.65 16.66
0 1 0 1 1 120.00 30.00 60.00 15.00
0 1 1 0 0 122.00 30.50 61.00 15.25
0 1 1 0 1 125.00 31.25 62.50 15.63
0 1 1 1 0 128.21 32.05 64.105 16.026
0 1 1 1 1 130.00 32.50 65.00 16.25
1 0 0 0 0 132.00 33.00 66.00 16.50
1 0 0 0 1 133.90 33.48 66.95 16.74
1 0 0 1 0 138.00 34.50 69.00 17.25
1 0 0 1 1 142.00 35.50 71.00 17.75
1 0 1 0 0 146.00 36.50 73.00 18.25
1 0 1 0 1 150.00 37.50 75.00 18.75
1 0 1 1 0 153.00 38.25 76.50 19.13
1 0 1 1 1 156.00 39.00 78.00 19.50
1 1 0 0 0 159.00 39.75 79.50 19.88
1 1 0 0 1 162.00 40.50 81.00 20.25
1 1 0 1 0 165.00 41.25 82.50 20.63
1 1 0 1 1 168.00 42.00 84.00 21.00
1 1 1 0 0 171.00 42.75 85.50 21.38
1 1 1 0 1 174.00 43.50 87.00 21.75
1 1 1 1 0 177.00 44.25 88.50 22.13
1 1 1 1 1 180.00 45.00 90.00 22.50
ICS reserves the right to make changes in the device data identified in
this publication without further notice. ICS advises its customers to
obtain the latest version of all device data to verify that any
information being relied upon by the customer is current and accurate.