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PDF ICS94211 Data sheet ( Hoja de datos )
| Número de pieza | ICS94211 | |
| Descripción | Programmable System Frequency Generator | |
| Fabricantes | Integrated Circuit Systems | |
| Logotipo |  |
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Integrated
Circuit
Systems, Inc.
ICS94211
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 PCICLK, PCICLK_F,
SDRAM skew.
• Real time system reset output
• 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
Pin Configuration
VDDREF
*PCI_STOP/REF0
GND
X1
X2
VDDPCI
*MODE/PCICLK_F
**FS3/PCICLK0
GND
PCICLK1
PCICLK2
PCICLK3
PCICLK4
VDDPCI
BUFFER_IN
GND
SDRAM12
SDRAM11
VDDSDR
SDRAM10
SDRAM9
GND
SDATA
SCLK
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
VDDL
IOAPIC
REF1/FS2*
GND
CPUCLK0
CPUCLK1
VDDLCPU
RESET#
SDRAM0
GND
SDRAM1
SDRAM2
VDDSDR
SDRAM3
SDRAM4
GND
SDRAM5
SDRAM6
VDDSDR
SDRAM7
SDRAM8
VDD48
48MHz/FS0*
24MHz/FS1*
48-Pin 300mil SSOP
* Internal Pull-up Resistor of 120K to VDD
** Internal Pull-down resistor of 120K to GND
Key Specifications:
• CPU – CPU: <175ps
• SDRAM - SDRAM: <500ps
• PCI – PCI: <500ps
• CPU(early)-PCI: Min=1.0ns, Typ=2.0ns, Max=4.0ns
X1
X2
BUFFER IN
Block Diagram
PLL2
XTAL
OSC
/2
PLL1
Spread
Spectrum
FS(3:0) 4
MODE
Control
Logic
PCI
CLOCK
DIVDER
STOP
PCI_STOP#
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48MHz
24MHz
IOAPIC
2 REF(1:0)
13 SDRAM (12:0)
2 CPUCLK (1:0)
PCICLK (4:0)
5
PCICLK_F
RESET#
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
94211 Rev A 03/28/01
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.
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ICS94211
Byte 0: Functionality and frequency select register (Default=0)
Bit Description
Bit
(2,7:4)
Bit 3
Bit 1
Bit 0
Bit2
Bit7
FS3
Bit6
FS2
Bit5
FS1
Bit4
FS0
VCO/REF
Divider
VCO
MHz
CPUCLK
MHz
0 0 0 0 0 447/40 160.01 80.00
0 0 0 0 1 440/42 150.00 75.00
0 0 0 1 0 512/44 166.61 83.31
0 0 0 1 1 392/42 133.64 66.82
0 0 1 0 0 446/31 206.00 103.00
0 0 1 0 1 485/31 224.01 112.01
0 0 1 1 0 513/54 136.02 68.01
0 0 1 1 1 518/37 200.45 100.23
0 1 0 0 0 352/21 240.00 120.00
0 1 0 0 1 514/32 229.99 114.99
0 1 0 1 0 507/33 219.98 109.99
0 1 0 1 1 484/33 210.00 105.00
0 1 1 0 0 352/18 280.00 140.00
0 1 1 0 1 440/21 300.00 150.00
0 1 1 1 0 433/25 247.99 124.00
0 1 1 1 1 483/26 265.99 132.99
1 0 0 0 0 396/21 270.00 135.00
1 0 0 0 1 345/19 259.99 129.99
1 0 0 1 0 440/25 252.00 126.00
1 0 0 1 1 478/29 236.00 118.00
1 0 1 0 0 486/30 231.95 115.98
1 0 1 0 1 491/37 190.01 95.00
1 0 1 1 0 440/35 180.00 90.00
1 0 1 1 1 463/39 169.98 85.01
1 1 0 0 0 371/16 332.00 166.00
1 1 0 0 1 447/20 320.01 160.01
1 1 0 1 0 433/20 309.99 154.99
1 1 0 1 1 310/15 295.91 147.95
1 1 1 0 0 469/23 291.97 145.98
1 1 1 0 1 362/18 287.95 143.98
1 1 1 1 0 476/24 283.98 141.99
1 1 1 1 1 347/18 276.02 138.01
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
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
33.75
32.50
31.50
39.33
38.66
31.67
30.00
28.34
41.50
40.00
38.75
36.99
36.50
35.99
35.50
34.50
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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ICS94211
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
MIN TYP MAX UNITS
Output Impedance1
Output Impedance1
RDSP2B
RDSN2B
Vo=VDD*(0.5)
Vo=VDD*(0.5)
13.5 15
13.5 16.5
45
45
Ω
Ω
Output High Voltage
VOH2B IOH = -1 mA
2 2.48
V
Output Low Voltage
VOL2B IOL = 1 mA
0.04 0.4
V
Output High Current
IOH2B
VOH@MIN = 1 V
VOH@MAX = 2.375V
-60 -27
mA
-27 -7
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
27 63
mA
20 30
0.4 1.2 1.6 ns
0.4 0.9 1.6 ns
45 46.9 55
%
12.7 175 ps
Jitter, Cycle-to-cycle1 tjcyc-cyc2B
VT = 1.25 V, CPU 66, SDRAM 100
1Guaranteed by design, not 100% tested in production.
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
Output Low Voltage
Output High Current
VOH1
VOL1
IOH1
IOH = -1 mA
IOL = 1 mA
VOH@MIN = 1 V
VOH@MAX = 3.135V
2.4 V
0.55 V
-33 -33 mA
Output Low Current
IOL1
VOL@MIN = 1.95 V
VOL@MAX =0.4V
30 38 mA
Rise Time1
Fall Time1
Duty Cycle1
Skew1
Jitter, cycle-to-cycle1
tr1
tf1
dt1
tsk1
tjcyc-cyc1
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
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 16 Páginas | |
| PDF Descargar | [ Datasheet ICS94211.PDF ] | |
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