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ICS9133X Dataheets PDF



Part Number ICS9133X
Manufacturers Integrated Circuit Systems
Logo Integrated Circuit Systems
Description 32 kHz Motherboard Frequency Generator
Datasheet ICS9133X DatasheetICS9133X Datasheet (PDF)

Integrated Circuit Systems, Inc. ICS9133X 32 kHz Motherboard Frequency Generator General Description The 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 termi.

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Integrated Circuit Systems, Inc. ICS9133X 32 kHz Motherboard Frequency Generator General Description The 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 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. 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 package VDD32 Supply The ICS9133X has a separate power supply for the 32.768 kHz oscillator circuitry. This allows the 32 kHz clock to run from a battery or other source while the main power to the chip is disconnected. The VDD32 supply is guaranteed to operate down to +2.0V, with the clock consuming less than 10µA at +3.3V with the main VDD at 0V. The frequencies and power-down options in the ICS9133X are mask programmable. Customer specific masks can be made and prototypes delivered within 6-8 weeks from receipt of order. Integrated Circuit Systems also offers standard versions, such as that described in this data sheet. Applications Notebook/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. Block Diagram 9133X Rev A 052897P ICS reserves the right to make changes in the device data identified in this publication without further notice. ICS advises its customers to obtain the latest version of all device data to verify that any information being relied upon by the customer is current and accurate. ICS9133X Pin Configuration Decoding Table for CPU Clock SCLK22 0 0 0 0 1 1 1 1 SCLK21 0 0 1 1 0 0 1 1 SCLK20 0 1 0 1 0 1 0 1 2XCPU 8 16 32 40 50 66.6 80* 100* CPU 4 8 16 20 25 33.3 40* 50* * Only at 5V supply voltage 20-Pin PDIP or SOIC Pin Descriptions PIN NUMBER PIN NAME TYPE DESCRIPTION 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 32 kHz X2 X1 VDD32 VDD GND 16 MHz 24 MHz 12 MHz GND OE VDD 14.318 MHz GND VDD 2XCPU CPU SCLK2 SCLK1 SCLK0 Output Output Input Output Output Output Input Output Output Output Input Input Input 32.768 kHz buffered output, powered by VDD32. Connect 32.768 kHz crystal. Includes internal XTAL load capacitance. Connect 32.768 kHz crystal. This pin includes internal XTAL load capacitance and feedback bias for a 32.768 kHz crystal. Power supply for 32 kHz oscillator only. Power supply (+3.3 to +5.0V). GROUND. 16 MHz clock output. 24 MHz clock output. 12 MHz clock output. GROUND. OE tristate outputs when low. Has internal pull-up. Power supply (+3.3 to +5.0V). 14.318 MHz clock output. GROUND. Power supply (+3.3 to +5.0V). 2XCPU clock output (see decoding table). CPU clock output (see decoding table). CPU clock frequency SELECT2. Has internal pull-up. CPU clock frequency SELECT1. Has internal pull-up. CPU clock frequency SELECT0. Has internal pull-up. 2 ICS9133X Block Diagram for ICS9133X 32.768 kHz crystal 32.768 kHz 3 / Output Buffers 14.318 MHz Clock Generator Frequency Select 2XCPU CPU OE Output Buffers 16 MHz 12 MHz 24 MHz Reference Clock CPU Clock Output Buffers 14.318 MHz Peripheral Clocks Recommended External Circuit 1 2 (Note 4) 3 4 IC S 9 1 3 3 X 5 6 7 8 9 10 18 17 16 15 0.1µF 14 13 12 11 20 19 32.768 kHz VDDX VDD 0.1µF 0.1µF 2.2µF (Note 3) 0.1µF Notes: 1. The external components shown should be placed as close to the device as possible. 2. Pins 5 and 15 should be connected together externally. One decoupling capacitor may suffice for both pins. 3. May be part of system decoupling. 4. Crystal load capacitance and feedback bias contained internally on the X1, X2 pins. 3 ICS913.


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