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概览

描述

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

产品对比

应用

文档

类型 文档标题 日期
数据手册 PDF 324 KB
EOL 通告 PDF 606 KB
EOL 通告 PDF 599 KB
产品变更通告 PDF 35 KB
产品变更通告 PDF 484 KB
产品变更通告 PDF 361 KB
6 items

设计和开发

模型

ECAD 模块

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Diagram of ECAD Models

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