W48S87-72中文资料赛普拉斯数据手册PDF规格书

特性 Features

• Maximized EMI suppression using Cypress’s Spread Spectrum technology

• ±0.5 Spread Spectrum clocking

• Equivalent to the W48S67-72 with Spread Spectrum for Tilamook, MMO, and Deschutes processors

• Generates system clocks for CPU, IOAPIC, SDRAM, PCI, USB plus 14.318-MHz (REF0:1)

• Serial data interface (SDATA, SCLOCK inputs) provides additional CPU/PCI clock frequency selections, individual output clock disabling and other functions

• 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 = 2.5V±5

• Uses external 14.318-MHz crystal

• Available in 48-pin SSOP (300 mils)

• 10Ω CPU output impedance