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MK1491-14 - OPTi ACPI Firestar Clock Source

Download the MK1491-14 datasheet PDF. This datasheet also covers the MK1491E-14 variant, as both devices belong to the same opti acpi firestar clock source family and are provided as variant models within a single manufacturer datasheet.

General Description

The MK1491-14 is a low cost, low jitter, high performance clock synthesizer for OPTi’s Firestar and Firestar+ chipsets for Pentium™ Processor-based mobile computer applications.

Key Features

  • Packaged in 28 pin, 150 mil wide SSOP.
  • Provides all critical timing for OPTi ACPI Firestar and Firestar+.
  • Early Host clock of 3.5ns.
  • Separate VDD and skew adjust for Host 5,6, and 7 supports field upgrade to Firestar+ and new 2.5V processors.
  • 48MHz USB, 24MHz SIO, and Audio clock support.
  • Single pin CPU(Host) slowdown to 33.3MHz.
  • Multiple power down modes.
  • Low EMI Enable pin reduces EMI radiation (patent pending) Block Dia.

📥 Download Datasheet

Note: The manufacturer provides a single datasheet file (MK1491E-14_IntegratedCircuitSystems.pdf) that lists specifications for multiple related part numbers.

Datasheet Details

Part number MK1491-14
Manufacturer Integrated Circuit Systems
File Size 91.01 KB
Description OPTi ACPI Firestar Clock Source
Datasheet download datasheet MK1491-14 Datasheet

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

View original datasheet text
www.DataSheet4U.com MK1491-14 OPTi ACPI Firestar Clock Source Description The MK1491-14 is a low cost, low jitter, high performance clock synthesizer for OPTi’s Firestar and Firestar+ chipsets for Pentium™ Processor-based mobile computer applications. Using analog Phase-Locked Loop (PLL) techniques, the device uses a 14.318 MHz crystal input to produce multiple output clocks up to 75 MHz. It provides selectable Host and PCI local bus clocks as well as selectable clocks for Super I/O or Universal Serial Bus (USB). The device has up to seven Host output clocks. The chip has three different power down modes that reduce power on various clocks. Features • Packaged in 28 pin, 150 mil wide SSOP • Provides all critical timing for OPTi ACPI Firestar and Firestar+ • Early Host clock of 3.