ics9131 Integrated Device Technology, ics9131 Datasheet

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ics9131

Manufacturer Part Number
ics9131
Description
32 Khz Motherboard Frequency Generator
Manufacturer
Integrated Device Technology
Datasheet
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™ 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.
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 10µA 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.
Block Diagram
32 KhZ Motherboard Frequency Generator
9131 Rev B 052897P
Integrated
Circuit
Systems, Inc.
Features
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
16-Pin DIP or SOIC
Pentium is a trademark of Intel.
ICS9131

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ics9131 Summary of contents

Page 1

... 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 ...

Page 2

... ICS9131 Pin Descriptions PIN NUMBER PIN NAME 1 32 kHz VDD32 5 VCC 6 VSS 7 AGND FS2 10 REFCLK 11 STOPCLK# 12 VSS 13 VCC 14 CPUCLK 15 FS1 16 FS0 Functionality FS2 FS1 FS0 CPUCLK 33 ...

Page 3

... Recommended External Circuit Notes: 1) The external components shown should be placed as close to the device as possible. 2) Pins 5 and 13 should be connected together externally. One decoupling capacitor may suffice for both pins. 3 ICS9131 ...

Page 4

... ICS9131 Absolute Maximum Ratings VDD 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 ...

Page 5

... 15pF load @1. 10,000 samples jis T 10,000 samples jabs T 10,000 samples jis T 10,000 samples jabs T 10,000 samples jis T 10,000 samples jabs ICS9131 MIN TYP MAX UNITS 12.0 - 100 MHz 2 kHz - 0.60 1.4 - 1.6 3.0 - 0.50 1.2 - 0.9 2 150 ...

Page 6

... ICS9131 Electrical Characteristics at 3.3V Operating V = +3.3V to +3.7V PARAMETER SYMBOL Input Low Voltage Input High Voltage Input Low Current Input High Current Pull-up Resistor, Note 1 Output Low Current, Note 1 Output High Current, Note 1 Output Low Voltage, Note 1 Output High Voltage, Note 1 Supply Current ...

Page 7

... Stop Clock Feature The ICS9131 incorporates a unique stop clock feature compat-ible with static logic processors. When the stop clock pin goes low, the CPUCLK will go low after the next occuring falling edge. When STOPCLK again goes high, CPUCLK resumes on the next rising edge of the internal clock ...

Page 8

... ICS9131 Ordering Information ICS9131-01CN16 or ICS9131-01CS16 Example: ICS XXXX M X#W 16-Pin DIP Package 16-Pin SOIC Package Lead Count & Package Width Lead Count= digits W=.3” SOIC or .6” DIP; None=Standard Width Package Type N=DIP (Plastic) S=SOIC Device Type (consists digit numbers) ...

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