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ICS9131-01CN16 Datasheet

  • ICS9131-01CN16

  • 32 KhZ Motherboard Frequency Generator

  • 8頁

  • ICS

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Integrated
Circuit
Systems, Inc.
ICS9131
32 KhZ Motherboard Frequency Generator
General Description
The
ICS9131
offers a tiny footprint solution for generating
a selectable CPU clock from a 32.768 kHz crystal. The device
allows a variety of microprocessors to be clocked by changing
the state of address lines FS0, FS1, and FS2. The
ICS9131
is
the ideal solution for replacing high speed oscillators and for
reducing clock speeds to save power in computers. The
device provides smooth, glitch-free frequency transitions so
that the CPU can continue to operate during slow down or
speed up. The rate of frequency change makes the
ICS9131
compatible with all 386DX, 386SX, 486DX, 486DXZ, 486SX
and Pentium鈩?microprocessors.
The
ICS9131
is driven from a single 32.768 kHz crystal. The
only external components required are the crystal and a 10M
ohm resistor. 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.
Features
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Single 32.768 kHz crystal generates system clock and
selectable CPU clock
Generates CPU clocks from 8 MHz to 100 MHz.
Operates from 3.3V or 5.0V supply
Operates up to 66 MHz at 3.3V
Separate VDD for 32 kHz clock enables it to run from
battery
STOPCLK feature allows for a glitch-free turn-on and
Pen-turn-off of the CPU clock to static processors
Output enable tristates outputs
16-pin PDIP or SOIC package
Frequency selects allow for a smooth transition of
the CPUCLK
Pin Configuration
VDD32 Supply
The
ICS9131
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 10碌A(chǔ) at
+3.3V and the main VDD at 0V.
The frequencies and power-down options in the
ICS9131
are
mask programmable. Customer specific masks can be made
and prototypes delivered within 6-8 weeks from receipt of
order. ICS also offers standard versions, such as those de-
scribed in this data sheet.
16-Pin DIP or SOIC
Block Diagram
Pentium is a trademark of Intel.
9131 Rev B 052897P

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