ICS9248BF-195 IDT, Integrated Device Technology Inc, ICS9248BF-195 Datasheet - Page 3

• Manufacturer Part Number: ICS9248BF-195
• Description: IC FREQ GENERATOR/BUFFER 48-SSOP
• Manufacturer: IDT, Integrated Device Technology Inc
• Type: Frequency Generatorr

Specifications of ICS9248BF-195

• Input: Crystal
• Output: Clock
• Frequency - Max: 137MHz
• Voltage - Supply: 3.135 V ~ 3.465 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 48-SSOP
• Frequency-max: 137MHz
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 9248BF-195

General Description
Serial Configuration Command Bitmap
Notes:
1, Default at Power-up will be for latched logic inputs to define frequency. Bit [2, 6:4] are default to 0011.
2, PWD = Power-Up Default
The ICS9248-195 is the single chip clock solution for Notebook designs using the 440BX, MX, VIA PM/PL/PLE 133
style chip set, with Coppermine or Tualatin processor, for Note book applications. It provides all necessary clock signals
for such a system.
Spread spectrum may be enabled through I
to 10dB. This simplifies EMI qualification without resorting to board design iterations or costly shielding. The ICS9248-
195 employs a proprietary closed loop design, which tightly controls the percentage of spreading over process and
temperature variations.
Byte0: Functionality and Frequency Select Register (default = 0)
0375E—12/15/08
Bit 2,
Bit 7
Bit 3
Bit 1
Bit 0
6:4
Bit
0 = Center Spread Spectrum Modulation
1 = Down Spread Spectrum Modulation
0 - Frequency is selected by hardware select pins. Latched inputs.
1 - Frequency is controlled by I
0 - Normal
1 - Spread Spectrum Enabled
0 - Running
1 - Tristate all outputs
FS3
Bit2
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
FS2
Bit6
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
FS1
Bit5
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
FS0
Bit4
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
CPUCLK
100.00
133.33
100.00
100.00
133.33
100.00
133.33
105.00
133.33
140.00
66.67
66.67
66.67
66.67
90.00
70.00
Description
2
C programming.
PCICLK
33.33
33.33
33.33
33.33
33.33
33.33
33.33
33.33
33.33
33.33
30.00
33.33
35.00
35.00
33.33
35.00
2
C programming. Spread spectrum typically reduces system EMI by 8dB
Spread %
±0.35%
±0.35%
±0.60%
±0.35%
±0.23%
±0.23%
±0.60%
±0.23%
±0.45%
±0.45%
±0.35%
±0.45%
±0.35%
±0.35%
±0.60%
±0.35%
Center
3
Spread%
-0.70%
-0.70%
-1.20%
-0.70%
-0.45%
-0.45%
-1.20%
-0.45%
-0.90%
-0.90%
-0.70%
-0.90%
-0.70%
-0.70%
-1.20%
-0.70%
Down
Note1
PWD
0011
1
0
1
0
ICS9248-195