(China (Mainland))
Product Summary
The ICS9248DF-39LF is a Frequency Generator & Integrated Buffers for PENTIUM/ProTM. It generates all clocks required for high speed RISC or CISC microprocessor systems such as Intel PentiumPro or Cyrix. The features of the ICS9248DF-39LF include two CPU, six PCI and thirteen SDRAM clocks. Two reference outputs are available equal to the crystal frequency. Plus the IOAPIC output powered by VDDL1. One 48 MHz for USB, and one 24 MHz clock for Super IO. Additionally, the ICS9248DF-39LF meets the Pentium power-up stabilization, which requires that CPU and PCI clocks be stable within 2ms after power-up.
Parametrics
ICS9248DF-39LF absolute maximum ratings: (1)Supply Voltage:5.5V; (2)Logic Inputs: GND –0.5V to VDD +0.5V; (3)Ambient Operating Temperature:0℃ to +70℃; (4)Case Temperature:115℃; (5)Storage Temperature:–65℃ to +150℃.
Features
ICS9248DF-39LF features: (1)3.3V outputs: SDRAM, PCI, REF, 48/24MHz; (2)2.5V outputs: CPU, IOAPIC; (3)20 ohm CPU clock output impedance; (4)20 ohm PCI clock output impedance; (5)Skew from CPU (earlier) to PCI clock - 1.5 to 4 ns,center 2.6 ns.; (6)No external load cap for CL=18pF crystals; (7)±175 ps CPU clock skew; (8)250ps (cycle to cycle) CPU jitter; (9)Smooth frequency switch, with selections from 66.8 to 150 MHz CPU; (10)I2C interface for programming; (11)3ms power up clock stable time; (12)Clock duty cycle 45-55%; (13)48 pin 300 mil SSOP package; (14)3.3V operation, 5V tolerant inputs (with series R); (15)<5ns propagation delay SDRAM from Buffer Input.
Diagrams
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 ICS9248DF-39LF |
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IC GEN/BUFFER PENTIUM PRO 48SSOP |
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ICS9248DF-39LFT |
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IC GEN/BUFFER PENTIUM PRO 48SSOP |
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