Features: • Single 32.768 kHz crystal generates all PC motherboard clocks
• Cost-reduced version of popular ICS9132
• Contains internal crystal load capacitors and feedback bias
• 3 independent clock generators
• Generates CPU clocks from 12.5 to 100 MHz
• Up to 7 output clocks
• Separate VDD for 32 kHz clock
• Output enable tristates outputs
• Power-down options available
• Operates from 3.3V or 5.0V supply
• Operates up to 66 MHz at 3.3V
• Skew controlled 1X and 2X CPU clocks
• 20-pin PDIP or SOIC packageApplicationNotebook/Palmtop Computers: The ICS9133X works with ++3V and +5V and a single 32.768 kHz crystal, making it the ideal solution for generating clocks in portables with minimum board space. The user can save power by using this single part instead of oscillators or other frequency generators. The ICS9133X further reduces the current consumption by having the ability to completely shut down the individual clocks when not in use, while still maintaining the separately powered 32.768 kHz clock.
SpecificationsVDD referenced to GND .............................................................................. 7V
Operating temperature under bias .......................................... 0°C to +70°C
Storage temperature ......................................................... -40°C to +150°C
Voltage on I/O pins referenced to GND ...................GND -0.5V to VDD +0.5V
Power dissipation ..........................................................................0.5 Watts
Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect product reliability.
DescriptionThe ICS9133X is designed to generate clocks for all 286, 386,486, Pentium and RISC-based motherboards, including laptops and notebook computers. The only external components required are a 32.768 kHz crystal and decoupling capacitors.The device generates the 14.318 MHz system clock, eliminating the need for a 14.318 MHz crystal. High performance applications may require high speed clock termination components. The chip of the ICS9133X includes three independent clock generators plus the 32.768 kHz reference clock to produce all necessary frequencies,including real time clock/DRAM refresh, master clock, CPU clock, twice CPUclock frequency, keyboard clock, floppy disk controller clock, serial communications clock and bus clocks. Different frequencies from clock #2 can be selected using the frequency select pins, but clock #1 will be at 14.318 MHz for all standard versions.
ICS9133X Data Sheet
