ics9248-107 Integrated Device Technology, ics9248-107 Datasheet
ics9248-107
Related parts for ics9248-107
ics9248-107 Summary of contents
Page 1
... PCI Output Skew: <580ps • 3V66 Output Skew <250ps • CPU to 3V66 Output Offset: 0.8 - 1.8ns (typ = 1.3ns) • CPU to PCI Output Offset: 0.0 - 1.5ns (typ = 1.0ns) • CPU to IOAPIC Output Offset: 1.5 - 4.0ns (typ = 2.0ns) 9248-107 RevA - 5/21/01 ICS9248-107 Pin Configuration GNDREF 1 48 REF0 2 47 *SEL24_48#/REF1 3 ...
Page 2
... ICS9248-107 General Description The ICS9248-107 is a main clock synthesizer chip for Pentium II based systems using Rambus Interface DRAMs. This chip provides all the clocks required for such a system when used with a zero delay buffer such as the ICS9179-06. Spread Spectrum may be enabled through I EMI qualification without resorting to board design iterations or costly shielding ...
Page 3
... CPU PC I 3V66 IOAPIC 103.0 34.33 68.67 17.17 100.0 33.33 66.67 16.67 100.5 33.48 66.97 16.74 100.9 33.63 67.27 16.82 107.1 35.70 71.40 17.85 109.0 36.33 72.67 18.17 112.0 37.33 74.67 18.67 114.0 28.50 57.00 14.25 116.0 29.00 58.00 14.50 118.0 29.50 59.00 14.75 133.3 33.33 66.65 16.66 120.0 30.00 60.00 15.00 122.0 30.50 61.00 15.25 125.0 31.25 62.50 15.63 50.0 16.67 33.33 8.33 66.7 16.67 33.33 8.33 133.3 33.33 66.67 16.67 133.9 33.48 66.95 16.74 138 34.5 69 17.25 142 35.5 71 17.75 146 36.5 73 18.25 150 37.5 75 18.75 153 38.25 76.5 19.13 156 39 78 19.5 159.1 39.78 79.55 19.89 162 40.5 81 20.25 166.7 41.67 83.33 20.83 168 171 42.75 85.5 21.38 174 43.5 87 21.75 177 44.25 88.5 22.13 180 45 90 22.5 3 ICS9248-107 ...
Page 4
... ICS9248-107 Serial Configuration Command Bitmap Byte 0: Functionality and frequency select register (Default = ...
Page 5
... Note: Don’t write into this register, writing into this register can cause malfunction 5 ICS9248-107 ...
Page 6
... ICS9248-107 Absolute Maximum Ratings Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V Logic Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND –0 Ambient Operating Temperature . . . . . . . . . . . . 0°C to +70°C Storage Temperature . . . . . . . . . . . . . . . . . . . . . . –65°C to +150°C Case Temperature . . . . . . . . . . . . . . . . . . . . . . . . 115°C Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. These ratings are stress specifications only and functional operation of the device at these or any other conditions above those listed in the operational sections of the specifications is not implied ...
Page 7
... 1.25 V CPU frequency < 142 MHz 1.25 V CPU frequency > 142 MHz 1. 1. ICS9248-107 Measurement Points CPU @ 1.25V, 3V66 @ 1.5 V CPU @ 1.25V, PCI @ 1.5 V CPU @ 1.25V, IOAPIC @ 1.25 V MIN TYP MAX UNITS 2 2.3 V 0.3 0.4 V -35 - 0.4 1.03 1.6 ns ...
Page 8
... ICS9248-107 Electrical Characteristics - 3V66 70º 3.3 V +/-5 PARAMETER SYMBOL Output High Voltage V OH1 Output Low Voltage V OL1 Output High Current I OH1 Output Low Current I OL1 1 Rise Time Fall Time Duty Cycle Skew T sk1 1 t Jitter, Cycle-to-cycle ...
Page 9
... 2.0 V OH5 0.8 V OL5 0 2 2. 1.5 V jcyc-cyc5 T 9 ICS9248-107 MIN TYP MAX UNITS 2.6 2.9 V 0.3 0.4 V - 314 500 ps MIN TYP MAX UNITS 2.6 2.9 V 0.3 0.4 V -27 -22 ...
Page 10
... ICS9248-107 Electrical Characteristics - IOAPIC 70º 3.3 V +/-5 PARAMETER SYMBOL Output High Voltage V OH4B Output Low Voltage V OL4B Output High Current I OH4B Output Low Current I OL4B 1 Rise Time t r4B 1 Fall Time t f4B 1 Duty Cycle d t4B 1 tsk4B Skew 1 t Jitter, Cycle-to-cycle ...
Page 11
... ICS9248-107 ...
Page 12
... ICS9248-107 General I The information in this section assumes familiarity with I For more information, contact ICS for an I How to Write: • Controller (host) sends a start bit. • Controller (host) sends the write address D2 • ICS clock will acknowledge • Controller (host) sends a dummy command code • ...
Page 13
... As shown, the outputs Stop Low on the next falling edge after PD# goes low asynchronous input and metastable conditions may exist. This signal is synchronized inside this part. 4. The shaded sections on the VCO and the Crystal signals indicate an active clock. 5. Diagrams shown with respect to 133MHz. Similar operation when CPU is 100MHz. 13 ICS9248-107 ...
Page 14
... ICS9248-107 INDEX INDEX AREA AREA 45° 45° SEATING SEATING b PLANE PLANE .10 (.004) C .10 (.004) C 300 mil SSOP Package Ordering Information ICS9248yF-107 Example: ICS XXXX PPP Pattern Number ( digit number for parts with ROM code patterns) ...