Frequency Generator & Integrated Buffers for PENTIUM/ProTM

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.

Features

  • 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

Product Options

Orderable Part ID Part Status Pkg. Code Pkg. Type Lead Count (#) Temp. Grade Pb (Lead) Free Carrier Type Buy Sample
9248DF-39LF Obsolete PVG48 SSOP 48 C Yes Tube Availability
9248DF-39LFT Obsolete PVG48 SSOP 48 C Yes Reel Availability

Technical Documentation

Title Other Languages Type Format File Size Date
Datasheets & Errata
9248-39 Datasheet Datasheet PDF 287 KB Mar 22, 2006
PCNs & PDNs
PDN# : CQ-17-04(R1) Product Discontinuance Notice Product Discontinuation Notice PDF 606 KB Nov 29, 2017
PDN# : CQ-17-04 Product Discontinuance Notice Product Discontinuation Notice PDF 599 KB Aug 24, 2017
PCN# : A1506-02 Gold wire to Copper wire Product Change Notice PDF 35 KB Oct 7, 2015
PCN# : A1504-04 Assembly Transfer from Amkor Philippines to OSE Taiwan Product Change Notice PDF 484 KB Jul 1, 2015
PCN# : TB1303-02 Change of Tape & Reel Packing Method for Selective Products Product Change Notice PDF 361 KB Mar 23, 2013

Software & Tools

Title Other Languages Type Format File Size Date
9248-39 IBIS Model Model - IBIS ZIP 31 KB Mar 22, 2006