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.

特長

  • 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

製品選択

発注型名 Part Status Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type 購入/サンプル
Obsolete SSOP 48 C はい Tube
Availability
Obsolete SSOP 48 C はい Reel
Availability

ドキュメント&ダウンロード

タイトル 他の言語 分類 形式 サイズ 日付
データシート
9248-39 Datasheet データシート PDF 324 KB
PCN / PDN
PDN# : CQ-17-04(R1) Product Discontinuance Notice 製品中止通知 PDF 606 KB
PDN# : CQ-17-04 Product Discontinuance Notice 製品中止通知 PDF 599 KB
PCN# : A1506-02 Gold wire to Copper wire 製品変更通知 PDF 35 KB
PCN# : A1504-04 Assembly Transfer from Amkor Philippines to OSE Taiwan 製品変更通知 PDF 484 KB
PCN# : TB1303-02 Change of Tape & Reel Packing Method for Selective Products 製品変更通知 PDF 361 KB
ダウンロード
9248-39 IBIS Model モデル-IBIS ZIP 31 KB