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ICS9134-07 Datasheet

  • ICS9134-07

  • 32 kHz Motherboard Frequency Generator

  • 6頁(yè)

  • ICS

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Integrated
Circuit
Systems, Inc.
ICS9134-06
ICS9134-07
Advance Information
32 kHz Motherboard Frequency Generator
General Description
The
ICS9134-06
and
ICS9134-07
are designed to generate
clocks for all 286, 386, 486, Pentium and RISC-based mother-
boards, 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 pro-
duce all necessary frequencies, including real time
clock/DRAM refresh, master clock, CPU clock, keyboard
clock, floppy disk controller clock, serial communications
clock and bus clocks. Different frequencies from clocks #2 can
be selected using the frequency select pins, but clock #1 will
be at 14.318 MHz for all standard versions.
Features
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I
DD
<10
碌A(chǔ)
when 32 kHz is running on VDD32
Single 32.768 kHz crystal generates all PC motherboard
clocks
3 independent clock generators
Generates CPU clocks from 4.0 to 80 MHz
Up to 5 output clocks
Separate VDD for 32 kHz clock
Power-down options available
Operates from 3.3V or 5.0V supply
Operates up to 66 MHz at 3.3V
Supports OPTi 80C463/5 and Fir鈩?chipsets
鈩?/div>
16-pin, 300-mil, SOIC package
VDD32 Supply
The
ICS9134-06
and
ICS9134-07
have a separate power sup-
ply 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 10碌A(chǔ) at +3.3V with the main VDD at 0V.
The frequencies and power-down options in the
ICS9134-06
and
ICS9134-07
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
ICS9134-06
and
ICS9134-07
work with +3.3V 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
ICS9134-06
and
ICS9134-07
further reduce 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
VDD32
32.768 kHz
crystal
32.768 kHz
Reference
Clock
Clock
Generator
1
Clock
Generator
2
CPUCLK
14.318 MHz
Clock
Generator
3
Peripheral
Clocks
Fir is a trademark of Picopower Corporation.
9134-06 9134-07 RevC111695

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