The IDT9248-39 generates all clocks required for high speed RISC or CISC microprocessor systems such as Intel PentiumPro or Cyrix. Eight different reference frequency multiplying factors are externally selectable with smooth frequency transitions.

特性

  • 3.3V outputs: SDRAM, PCI, REF, 48/24MHz
  • 2.5V outputs: CPU, IOAPIC
  • 20 ohm CPU clock output impedance
  • 20 ohm PCI clock output impedance
  • Skew from CPU (earlier) to PCI clock - 1.5 to 4 ns, center 2.6 ns.
  • No external load cap for CL=18pF crystals
  • ±175 ps CPU clock skew
  • 250ps (cycle to cycle) CPU jitter
  • Smooth frequency switch, with selections from 66.8 to 150 MHz CPU.
  • I2C interface for programming
  • 3ms power up clock stable time
  • Clock duty cycle 45-55%.
  • 48 pin 300 mil SSOP package
  • 3.3V operation, 5V tolerant inputs (with series R)
  • <5ns propagation delay SDRAM from Buffer Input

tune产品选择

器件号 Part Status Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
Obsolete SSOP 48 C 是的 Tube
Availability
Obsolete SSOP 48 C 是的 Reel
Availability

description文档

文档标题 language 类型 文档格式 文件大小 日期
数据手册与勘误表
star 9248-39 Datasheet 数据手册 PDF 324 KB
PCN / PDN
PDN# : CQ-17-04(R1) Product Discontinuance Notice 产品停产通告 PDF 606 KB
PDN# : CQ-17-04 Product Discontinuance Notice 产品停产通告 PDF 599 KB
PCN# : A1506-02 Gold wire to Copper wire 产品变更通告 PDF 35 KB
PCN# : A1504-04 Assembly Transfer from Amkor Philippines to OSE Taiwan 产品变更通告 PDF 484 KB
PCN# : TB1303-02 Change of Tape & Reel Packing Method for Selective Products 产品变更通告 PDF 361 KB

file_download下载

文档标题 language 类型 文档格式 文件大小 日期
模型
9248-39 IBIS Model 模型 - IBIS ZIP 31 KB