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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 PentiumTM 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. HighPerformance applications may require high speed clock termination components.
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
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 10A 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 described in this data sheet.
16-Pin DIP or SOIC
Block Diagram
Pentium is a trademark of Intel.
9131 Rev B 052897P
ICS9131
Pin Descriptions
PIN NUMBER 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 PIN NAME 32 kHz X2 X1 VDD32 VCC VSS AGND OE FS2 REFCLK STOPCLK# VSS VCC CPUCLK FS1 FS0 TYPE Output Output Input ----Input Input Output Input --Output Input Input DESCRIPTION 32.768 kHz output. Connect 32 kHz crystal, this input includes internal load capacitor for crystal. Connect 32 kHz crystal, this input includes internal load capacitor for crystal. Power Supply for 32 kHz oscillator. Power Supply. Ground. Analog Ground. OE tristates outputs when low. CPU clock frequency select 2. 14.318 MHz output. Stops CPU clock when low. Ground. Power supply. CPU clock output (see Decoding table). CPU clock frequency select 1. CPU clock frequency select 0.
Functionality
FS2 0 0 0 0 1 1 1 1 FS1 0 0 1 1 0 0 1 1 FS0 0 1 0 1 0 1 0 1 CPUCLK 16 25 33.3 40 50 60 66.6 80 ACTUALS 16.004 25.059 33.412 40.095 50.119 60.142 66.484 80.190
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ICS9131
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.
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ICS9131
Absolute Maximum Ratings
VDD referenced to GND . . . . . . . . . . . . . . . . . . . . . . 7V Operating temperature under bias. . . . . . . . . . . . . . . . 0C to +70C Storage temperature . . . . . . . . . . . . . . . . . . . . . . . . . . -40C to +150C 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.
Electrical Characteristics at 5V
Operating VDD = +4.5V to +5.5V; TA =0C to 70C unless otherwise stated
DC Characteristics
PARAMETER 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 Output High Voltage, Note 1 Supply Current Output Frequency Change over Supply and Temperature, Note 1 Standby Supply Current, Note 2
SYMBOL VIL VIH IIL IIH Rpu IOL IOH VOL VOH IDD Fd IDDSTDBY
TEST CONDITIONS
MIN 2.0 -15.0 -2.0 25 2.4 -
TYP -6.0 400 45 -53 0.15 3.7 18 0.002 12
MAX 0.8 2.0 700 -35 0.4 35 0.05 25
UNITS V V A A k ohms mA mA V V mA % mA
V IN=0V V IN=VDD V IN=VDD-1V V OUT=0. 8V V OUT=2.0V I OL=10mA I OH=-30mA No load, at 50 MHz With respect to typical frequency Unloaded
Note 1: Parameter is guaranteed by design and characterization. Not 100% tested in production. Note 2: With the STOPCLK pin low (active). Note 3: Absolute Jitter measured as the shortest and longest period difference to the mean period of the sample set.
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ICS9131
Electrical Characteristics at 5V
Operating VDD = +4.5V to +5.5V; TA =0C to 70C unless otherwise stated
AC Characteristics
PARAMETER Output Frequency, Note 1 Input Frequency, Note 1 Output Rise time, Note 1 Rise time, Note 1 Output Fall time, Note 1 Fall time, Note 1 Duty cycle, Note 1 Jitter, 1 sigma from 33-80 MHz, Note 1 Jitter, Absolute from 33-80 MHz, Notes 1, 3 Jitter, 1 sigma from 16-25 MHz, Note 1 Jitter, Absolute from 16-25 MHz, Note 1, 3 Jitter, 1 sigma from 14 to below, Note 1 Jitter, Absolute from 14 to below, Note 1, 3 Frequency Transition time, Note 1 Power-up time, Note 1
SYMBOL fo fi tr tr tf tf dt Tjis Tjabs Tjis Tjabs Tjis Tjabs tft tpu
TEST CONDITIONS Clock1 15pF 15pF 15pF 15pF load, load, load, load, 0.8 to 2.0V 20% to 80% VDD 2.0 to 0.8V 80% to 20% VDD
MIN 12.0 2.0 45 -250
TYP 32 0.60 1.6 0.50 0.9 50 50 60
MAX 100 38 1.4 3.0 1.2 2.5 55 150 250 150 600 3 5 10.0 15
UNITS MHz kHz ns ns ns ns % ps ps ps ps % % ms ms
15pF load @1.4V 10,000 samples 10,000 samples 10,000 samples 10,000 samples 10,000 samples 10,000 samples
-600 2.0 3.0
1 2 5.0 7.5
Note 1: Parameter is guaranteed by design and characterization. Not 100% tested in production. Note 2: With the STOPCLK pin low (active). Note 3: Absolute Jitter measured as the shortest and longest period difference to the mean period of the sample set.
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ICS9131
Electrical Characteristics at 3.3V
Operating VDD = +3.3V to +3.7V; TA =0C to 70C unless otherwise stated
DC Characteristics
PARAMETER 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 Output Frequency Change over Supply and Temperature, Note 1 Standby Supply Current, Note 2 Output Frequency, Note 1 Input Frequency, Note 1 Rise time, Note 1 Fall time, Note 1 Duty cycle, Note 1 Jitter, 1 sigma , Note 1 Jitter, Absolute, Note 1, 3 Jitter, 1 sigma from 16-25 MHz Jitter, Absolute from 16-25 MHz Jitter, 1 sigma from 14 to below Jitter, Absolute from 14 to below Frequency Transition time, Note 1 Power-up time, Note 1
SYMBOL VIL VIH IIL IIH Rpu IOL IOH VOL VOH IDD Fd IDDSTDBY fo fi tr tf dt Tjis Tjabs Tjis Tjabs Tjis Tjabs tft tpu
TEST CONDITIONS
MIN 0.7 VDD -7.0 -2.0 15 6.85 V DD 12.0 2.0 43 -250 -600 -
TYP -2.5 600 24 -13 0.05 V DD 0.94 V DD 13 0.002 8 32 2.2 1.2 50 60 1 2 6.7 8.55
MAX 0.2 V DD 2.0 900 -8 0.1 V DD 25 0.05 15 100 38 3.5 2.5 53 150 250 150 600 3 5 14.0 17.0
UNITS V V A A k ohms mA mA V V mA % mA MHz kHz ns ns % ps ps ps ps % % ms ms
VIN=0V VIN=VDD VIN=VDD-1V VOUT=0.2V VOUT=0.7V IOL=60mA IOH=-4.0mA No load, at 50 MHz With respect to typical frequency No load
AC Characteristics
Clock1 15pF load, 20% to 80% VDD 15pF load, 80% to 20% VDD 15pF load @50% V DD 10,000 samples 10,000 samples 10,000 samples 10,000 samples 10,000 samples 10,000 samples
Note 1: Parameter is guaranteed by design and characterization. Not 100% tested in production. Note 2: With the STOPCLK pin low (active). Note 3: Absolute Jitter measured as the shortest and longest period difference to the mean period of the sample set.
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ICS9131
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. This feature enables fast, glitch-free starts and stops of the CPUCLK and is useful in Energy Star motherboard applications.
32 kHz Supply Current
ADVANCE INFORMATION documents contain information on new products in the sampling or preproduction phase of development. Characteristic data and other specifications are subject to change without notice.
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ICS9131
16-Pin DIP Package
16-Pin SOIC Package
Ordering Information
ICS9131-01CN16 or ICS9131-01CS16
Example:
ICS XXXX M X#W
Lead Count & Package Width
Lead Count=1, 2 or 3 digits W=.3" SOIC or .6" DIP; None=Standard Width
Package Type
N=DIP (Plastic) S=SOIC
Device Type (consists of 3 or 4 digit numbers) Prefix
ICS, AV=Standard Device
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