W215B - Cypress Semiconductor

W215B Notebook PC system Frequency Generator

W215B CPU Outputs 0 through 3: These four CPU outputs are controlled by the CPU_STOP# control pin. Output voltage swing is controlled by voltage applied to VDDQ2. PCI Bus Outputs 0 through 5: These six PCI outputs are controlled by the PCI_STOP# control pin. Output voltage swing is controlled by voltage applied to VDDQ3. Free Running PCI Output: Unlike PCI.

Features

• Generates system clocks for CPU, IOAPIC, SDRAM, PCI, USB plus 14.318 MHz (REF0:1)
• MODE input pin selects optional power management input control pins (reconfigures pins 26 and 27)
• Two fixed outputs separately selectable as 24-MHz or 48-MHz (default = 48-MHz)
• VDDQ3 = 3.3V±5%, VDDQ2 = 3.3V±5%
• Uses external 14.318-MHz crystal
• Available in 48-pin TSSOP (6.1-mm)
• 10Ω CPU output impedance Table 1. Pin Selectable Frequency 95/100_SEL 0 1 CPU, SDRAM Clocks (MHz) 95.0 100.0 PCI Clocks CPU/3 CPU/3 Block Diagram VDDQ3 REF0 X1 X2 XTAL OSC PLL Ref Freq VDDQ2 IOAPIC VDDQ2 CPU0 CPU_2.5# www.Dat.