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PDF ICS94206 Data sheet ( Hoja de datos )
| Número de pieza | ICS94206 | |
| Descripción | Programmable System Frequency Generator | |
| Fabricantes | Integrated Circuit Systems | |
| Logotipo |  |
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Integrated
Circuit
Systems, Inc.
ICS94206
Programmable System Frequency Generator for PII/III™
Recommended Application:
440BX - VIA Apollo Pro133 - ALI 1631 style chipset.
Output Features:
• 2 - CPUs @2.5V
• 1 - IOAPIC @ 2.5V
• 13 - SDRAM @ 3.3V
• 6 - PCI @3.3V,
• 1 - 48MHz, @3.3V
• 1 - 24MHz @ 3.3V
• 2 - REF @3.3V, 14.318MHz.
Features:
• Programmable ouput frequency.
• Programmable ouput rise/fall time.
• Programmable PCI_F and PCICLK skew.
• Spread spectrum for EMI control typically by 7dB to
8dB,
with programmable spread percentage.
• Watchdog timer technology to reset system
if over-clocking causes malfunction.
• Uses external 14.318MHz crystal.
• FS pins for frequency select
Key Specifications:
• CPU – CPU: <175ps
• SDRAM - SDRAM: <500ps
• PCI – PCI: <500ps
• CPU(early)-PCI: Min=1.0ns, Typ=2.0ns, Max=4.0ns
Block Diagram
X1
X2
BUFFER IN
PLL2
XTAL
OSC
/2
STOP
PLL1
Spread
Spectrum
STOP
FS(3:0) 4
MODE
LATCH
STOP
4
POR
CLK_STOP#
PCI
CLOCK
Control
DIVDER
PCI_STOP#
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SDATA
SCLK
Config.
Reg.
STOP
48MHz
24MHz
IOAPIC
2 REF(1:0)
CPUCLK_F
CPUCLK 1
12 SDRAM (11:0)
SDRAM_F
PCICLK (4:0)
5
PCICLKF
VDD1
*PCI_STOP/REF0
GND
X1
X2
VDD2
*MODE/PCICLK_F
**FS3/PCICLK0
GND
PCICLK1
PCICLK2
PCICLK3
PCICLK4
VDD2
BUFFER IN
GND
SDRAM11
SDRAM10
VDD3
SDRAM9
SDRAM8
GND
SDATA
SCLK
Pin Configuration
1 48 VDDL1
2 47 IOAPIC
3 46 REF1/FS2*
4 45 GND
5 44 CPUCLK_F
6 43 CPUCLK1
7 42 VDDL2
8 41 CLK_STOP#*
9 40 SDRAM_F
10 39 GND
11 38 SDRAM0
12 37 SDRAM1
13 36 VDD3
14 35 SDRAM2
15 34 SDRAM3
16 33 GND
17 32 SDRAM4
18 31 SDRAM5
19 30 VDD3
20 29 SDRAM6
21 28 SDRAM7
22 27 VDD4
23 26 48MHz/FS0*
24 25 24MHz/FS1*
48-Pin 300mil SSOP
* Internal Pull-up Resistor of 120K to VDD
** Internal Pull-down resistor of 120K to GND
Functionality
FS3 FS2 FS1 FS0
0000
000 1
00 10
00 11
0 100
0 10 1
0 110
0 111
10 0 0
100 1
10
10
10 11
1 10 0
110 1
1 1 10
1111
CPU
(MHz)
80.00
75.00
83.31
66.82
103.00
112.01
68.01
100.23
120.00
114.99
109.99
105.00
140.00
150.00
124.00
132.99
PCICLK
(MHz)
40.00
37.50
41.65
33.41
34.33
37.34
34.01
33.41
40.00
38.33
36.66
35.00
35.00
37.50
31.00
33.25
94206 Rev B 04/26/01
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.
1 page  
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ICS94206
Byte 0: Functionality and frequency select register (Default=0)
Bit Description
Bit
(2,7:4)
Bit 3
Bit 1
Bit 0
Bit7 Bit6 Bit5 Bit4
Bit2 CPUCLK MHz
FS3 FS2 FS1 FS0
PCICLK
MHz
00000
80.00
40.00
0000 1
75.00
37.50
000 10
83.31
41.65
00011
66.82
33.41
0 0 10 0
103.00
34.33
0 0 10 1
112.01
37.34
00 110
68.01
34.01
00 111
100.23
33.41
0 1000
120.00
40.00
0 100 1
114.99
38.33
0 10 10
109.99
36.66
0 10 11
105.00
35.00
0 1 10 0
140.00
35.00
0 1 10 1
150.00
37.50
0 1110
124.00
31.00
0 1111
132.99
33.25
10 00 0
135.00
33.75
1000 1
129.99
32.50
100 10
126.00
31.50
100 11
118.00
39.33
10 10 0
115.98
38.66
10 10 1
95.00
31.67
10 110
90.00
30.00
10 111
85.01
28.34
1 100 0
166.00
41.50
1100 1
160.01
40.00
110 10
154.99
38.75
110 11
147.95
36.99
1 1 10 0
145.98
36.50
1 1 10 1
143.98
35.99
1 1 110
141.99
35.50
11111
138.01
34.50
0-Frequency is selected by hardware select, latched inputs
1- Frequency is selected by Bit 2,7:4
0- Normal
1- Spread spectrum enable ± 0.35% Center Spread
0- Running
1- Tristate all outputs
PWD
Note 1
0
1
0
Notes:
1w. Dwewfa.uDlt aattapoSwheer-eutp4wUil.lcboemfor latched logic inputs to define frequency, as displayed by Bit 3.
5
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ICS94206
Electrical Characteristics - CPU
TA = 0 - 70º C;VDD = 3.3V; VDDL = 2.5 V +/-5%; CL = 10 - 20 pF (unless otherwise stated)
PARAMETER
SYMBOL
CONDITIONS
Output Impedance1
Output Impedance1
RDSP2B
RDSN2B
Vo=VDD*(0.5)
Vo=VDD*(0.5)
Output High Voltage
VOH2B IOH = -1 mA
Output Low Voltage
VOL2B IOL = 1 mA
Output High Current
IOH2B
VOH@MIN = 1 V
VOH@MAX = 2.375V
Output Low Current
Rise Time1
Fall Time1
Duty Cycle1
Skew1
IOL2B
tr2B
tf2B
dt2B
tsk2B
VOL@MIN = 1.2 V
VOL@MAX =0.3V
VOL = 0.4 V, VOH = 2.0 V
VOH = 2.0 V, VOL = 0.4 V
VT = 1.25 V
VT = 1.25 V
Jitter, Cycle-to-cycle1 tjcyc-cyc2B
VT = 1.25 V, CPU 66, SDRAM 100
1Guaranteed by design, not 100% tested in production.
MIN
13.5
13.5
2
-27
27
0.4
0.4
45
TYP MAX UNITS
15 45 Ω
16.5 45
Ω
2.48 V
0.04 0.4
V
-60 -27
mA
-7
63
mA
20 30
1.2 1.6 ns
0.9 1.6 ns
46.9 55
%
12.7 175 ps
150 250 ps
Electrical Characteristics - PCI
TA = 0 - 70º C; VDD = 3.3 V +/-5%, CL = 40 pF for PCI0-1, CL = 10 - 30 pF for other PCIs (unless otherwise stated)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Output Impedance1
Output Impedance1
RDSP1
RDSN1
Vo=VDD*(0.5)
Vo=VDD*(0.5)
12 55 Ω
12 55 Ω
Output High Voltage
VOH1 IOH = -1 mA
2.4 V
Output Low Voltage
VOL1
IOL = 1 mA
0.55 V
Output High Current
IOH1
VOH@MIN = 1 V
VOH@MAX = 3.135V
-33 mA
-33
Output Low Current
Rise Time1
Fall Time1
Duty Cycle1
Skew1
Jitter, cycle-to-cycle1
IOL1
tr1
tf1
dt1
tsk1
tjcyc-cyc1
VOL@MIN = 1.95 V
VOL@MAX =0.4V
VOL = 0.4 V, VOH = 2.4 V,
VOL = 2.4 V, VOH = 0.4 V, PCI0-3
VT = 1.5 V
VT = 1.5 V
VT = 1.5 V
30 mA
38
0.5 1.5 2 ns
0.5 1.5 2 ns
45 52.5 55
%
49 500 ps
200 500 ps
1Guaranteed by design, not 100% tested in production.
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| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet ICS94206.PDF ] | |
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