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PDF ICS9250-19 Data sheet ( Hoja de datos )
| Número de pieza | ICS9250-19 | |
| Descripción | Frequency Generator & Integrated Buffers for Celeron & PII/III | |
| Fabricantes | Integrated Circuit Systems | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ICS9250-19 (archivo pdf) en la parte inferior de esta página. Total 15 Páginas | ||
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Integrated
Circuit
Systems, Inc.
ICS9250-19
Frequency Generator & Integrated Buffers for Celeron & PII/III™
Recommended Application:
BX, Appollo Pro 133 type of chip set.
Output Features:
• 3 - CPUs @2.5V, up to 150MHz.
• 17 - SDRAM @ 3.3V, up to 150MHz.
• 7 - PCI @3.3V
• 2 - IOAPIC @ 2.5V
• 1 - 48MHz, @3.3V fixed.
• 1 - 24MHz @ 3.3V
• 2 - REF @3.3V, 14.318MHz.
Features:
• Up to 150MHz frequency support
• Support power management: CPU, PCI, stop and Power
down Mode form I2C programming.
• Spread spectrum for EMI control (0 to -0.5%, ± 0.25%).
• Uses external 14.318MHz crystal
Key Specifications:
• CPU – CPU: <175ps
• CPU – PCI: 1 - 4ns
• PCI – PCI: <500ps
• SDRAM - SDRAM: <250ps
Pin Configuration
Block Diagram
56-Pin SSOP
* Internal Pull-up Resistor of 240K to 3.3V on indicated inputs
** Internal Pull-down resistor of 240K to GND on indicated inputs.
Functionality
FS3 FS2 FS1 FS0
1111
1 1 10
110 1
1 10 0
10 11
10
10
100 1
10 0 0
0 111
0 110
0 10 1
0 100
00 11
00 10
000 1
0000
CPU
(MHz)
133
124
150
140
105
110
115
120
100.0
133
112
103
66.6
83.3
75
124
PCICLK (MHz)
33.3 (CPU/4)
31 (CPU/4)
37.5 (CPU/4)
35 (CPU/4)
35 (CPU/3)
36.67 (CPU/3)
38.33 (CPU/3)
40.00 (CPU/3)
33.43 (CPU/3)
44.33 (CPU/3)
37.33 (CPU/3)
34.33 (CPU/2)
33.40 (CPU/2)
41.65 (CPU/2)
37.5 (CPU/2)
41.33 (CPU/2)
9250-19 Rev C 4/12/01
Third party brands and names are the property of their respective owners.
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  
Serial Configuration Command Bitmap
Byte0: Functionality and Frequency Select Register (default = 0)
Bit
Bit 7
Bit 2,
Bit 6:4
Bit 3
Bit 1
Bit 0
Description
0 = 0 to -0.5% Down Spread Spectrum Modulation
1 = ±0.25% Center Spread Spectrum Modulation
Bit2 Bit6 Bit5 Bit4 CPU clock
PCI
0111
0110
100.0
133
33.43 (CPU/3)
44.33 (CPU/3)
0101
112 37.33 (CPU/3)
0100
103 34.3 (CPU/3)
0011
66.6 33.4 (CPU/2)
0010
83.3 41.65(CPU/2)
0001
0000
75 37.5 (CPU/2)
124 41.33 (CPU/3)
1111
1110
133 33.25 (CPU/4)
124 31.00 (CPU/4)
1101
1100
150 37.50 (CPU/4)
140 35.00 (CPU/4)
1011
1010
105 35.00 (CPU/3)
110 36.67 (CPU/3)
1001
1000
115 38.33 (CPU/3)
120 40.00 (CPU/3)
0 - Frequency is selected by hardware select, Latched Inputs
1 - Frequency is selected by Bit 6:4 (above)
0 - Normal
1 - Spread Spectrum Enabled (Center Spread)
0 - Running
1- Tristate all outputs
PWD
0
Note1
0
1
0
Note 1. Default at Power-up will be for latched logic inputs to define frequency. Bits 4, 5, 6
are default to 000, and if bit 3 is written to a 1 to use Bits 6:4, then these should be
defined to desired frequency at same write cycle.
Note: PWD = Power-Up Default
ICS9250-19
Third party brands and names are the property of their respective owners.
5
5 Page 
ICS9250-19
Electrical Characteristics - CPUCLK
TA = 0 - 70º C; VDD = 3.3 V +/-5%, VDDL = 2.5 V +/-5%; CL = 20 pF (unless otherwise stated)
PARAMETER
SYMBOL
CONDITIONS
MIN
Output High Voltage
VOH2B IOH = -12.0 mA
Output Low Voltage
VOL2B IOL = 12 mA
Output High Current
IOH2B
VOH = 1.7 V
Output Low Current
IOL2B
VOL = 0.7 V
Rise Time
tr2B1 VOL = 0.4 V, VOH = 2.0 V
Fall Time
tf2B1 VOH = 2.0 V, VOL = 0.4 V
Duty Cycle
dt2B1
VT = 1.25 V
Skew group1: 1,2 and 1,F
tsk2B1
VT = 1.25 V
Skew group2: 2, F
tsk2B1
VT = 1.25 V
Jitter, One Sigma
Jitter, Absolute
Jitter, Cycle-to-cycle
tj1σ2B1
tjabs2B1
tjcyc-cyc2B1
VT = 1.25 V
VT = 1.25 V
VT = 1.25 V
1Guaranteed by design, not 100% tested in production.
2
19
0.4
0.4
45
-250
TYP MAX UNITS
2.3 V
0.2 0.4
V
-41 -19 mA
37 mA
1.6 ns
1 1.6 ns
51 55 %
120 175 ps
295 ps
120 250 ps
100 +250 ps
150 250 ps
Electrical Characteristics - 48MHz, 24MHz,REF0
TA = 0 - 70º C; VDD = 3.3 V +/-5%, VDDL = 2.5 V +/-5%; CL = 20 pF (unless otherwise stated)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Output High Voltage
Output Low Voltage
Output High Current
Output Low Current
Rise Time1
Fall Time1
Duty Cycle1
Jitter1
Jitter1
VOH5
VOL5
IOH5
IOL5
tr5
tf5
dt5
tj1s5
tjabs5
IOH = -14 mA
IOL = 6.0 mA
VOH = 2.0 V
VOL = 0.8 V
VOL = 0.4 V, VOH = 2.4 V
VOH = 2.4 V, VOL = 0.4 V
VT = 1.5 V
VT = 1.5 V, 24, 48MHz
VT = 1.5 V, REF0
2.4 2.9
V
0.25 0.4
V
-42 -20 mA
10 18
mA
1.1 2.5
ns
1 2.5 ns
45 50 55 %
100 250 ps
250 800 ps
1Guaranteed by design, not 100% tested in production.
Third party brands and names are the property of their respective owners.
11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet ICS9250-19.PDF ] | |
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