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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 10A 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 0.1F 14 13 12 11 20 19
32.768 kHz
VDDX VDD
0.1F 0.1F
2.2F (Note 3)
0.1F
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
ICS9133X
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 3.3V
Operating VDD = +3.0V 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 Output Low Voltage1 Output High Voltage1 Output High Current1 Output High Current1 Output Frequency Change over Supply and Temperature1 Short Circuit Current1 Supply Current VDD32 Supply Current VDD32 Supply Voltage Pull-up Resistor Value Input Clock Rise Time1 Input Clock Fall Time1 Output Rise Time1 Rise Time1 Output Fall Time1 Fall Time1 Duty Cycle1 Duty Cycle, reference clocks1 Jitter, One Sigma1 Jitter, Absolute1 Input Frequency1 Clock Skew between any Clock #2 outputs1 Power-up Time1
SYMBOL VIL VIH IIL IIH VOL VOH VOH VOH FD
TEST CONDITIONS
VIN=0V (Pull-up) VIN=VDD IOL=4mA IOH=-1mA IOH=-4mA IOH=-8mA With respect to typical frequency1 Each output clock No load, 40 MHz No load, VDD32=3.7V VDD=0 to 3.7V, 32 kHz output operating
AC Characteristics
MIN 0.7VDD -12 -2 VDD-.1V 2.4 -
TYP .005
MAX 0.2VDD 2 0.1 0.05
UNITS V V A A V V V V %
ISC IDD IDD 32 VDD 32 Rpu tICr tICf tr tf tf tf dt dt
2.0 43/57 40/60 25 -
15 10 5 620 1.5 2.5 1.5 2.5 48/52 43/57 1 2 32.768 100 1,000
12 5 5 2 4 2 4 57/43 60/40 3 5 40 500 -
mA mA A V k1/2 s s ns ns ns ns % % % % kHz ps ms
15pF 15pF 15pF 15pF 15pF 15pF
load, 0.8 to 2.0V load, 20% to 80% VDD load, 2.0 to 0.8V load, 80% to 20% VDD load @ Vth=1.4V load @ 1.4V2
As compared with clock period. tjab fi Tsk tpu From off to 40 MHz
Note: 1. Parameter is guaranteed by design and characterization. Not 100% tested in production. 2. 32 kHz output duty cycle is dependent on crystal used. 4
ICS9133X
Electrical Characteristics at 5V
VDD = +5.0V 10%; T A =0C to 70C unless otherwise stated
DC Characteristics
PARAMETER Input Low Voltage Input High Voltage Input Low Current Input High Current Output Low Voltage1 Output High Voltage
1
SYMBOL VIL VIH IIL IIH VOL VOH VOH VOH FD ISC IDD IDD 32 VDD 32 Rpu
TEST CONDITIONS
MIN 0.7VDD
TYP .005 33 17 7.5 380 1 2 1 2 48/52 43/57 1 2 32.768 100 10
MAX 0.2VDD 2 0.1 0.05 20 5 5 1.5 3 1.5 3 57/43 60/40 3 5 40 500 -
UNITS V V A A V V V V % mA mA A V k1/2 s s ns ns ns ns % % % % kHz ps ms
VIN=0V (Pull-up) VIN=VDD IOL=4mA IOH=-1mA IOH=-4mA IOH=-8mA With respect to typical frequency1 Each output clock No load, 40 MHz No load, VDD32=5.5V VDD=0 to 5.5V, 32 kHz output operating
AC Characteristics
-15 -2 VDD-.1V 2.4 2.0 -
Output High Voltage1 Output High Voltage1 Output Frequency Change over Supply and Temperature1 Short Circuit Current1 Supply Current VDD32 Supply Current VDD32 Supply Voltage Pull-up Resistor Value Input Clock Rise Time1 Input Clock Fall Time1 Output Rise Rise Time
1
tICr tICf tr tr tf tf dt dt tj1s tjab fi Tsk tpu From off to 40 MHz 15pF load, 0.8 to 2.0V 15pF load, 20% to 80% VDD 15pF load, 2.0 to 0.8V 15pF load, 80% to 20% VDD 15pF load @ Vth=1.4V 15pF load @ 1.4V
2
Time1
43/57 40/60 25 -
Output Fall Time1 Fall Time1 Duty Cycle1 Duty Cycle, reference clocks1 Jitter, One Sigma1 Jitter, Absolute
1
As compared with clock period.
Input Frequency1 Clock Skew between any Clock #2 outputs1 Power-up Time1
Note: 1. Parameter is guaranteed by design and characterization. Not 100% tested in production. 2. 32 kHz output duty cycle is dependent on crystal used.
5
ICS9133X
Typical 32 kHz Supply Current
14 12 10 A 8 6 4 2 0 0 1 2 3 Vdd 4 5 6 CL = 0pF CL = 25pF CL = 15pF
6
ICS9133X
Package Information
0.260 1.025 0.325
0.130
0.015 min
0.060 0.018 0.100
0 ~ 5 0.130
0.010 0.360
20-Pin DIP Package
Ordering Information
Example:
ICS XXXX-PPP M X#W
Lead Count & Package Width
Lead Count=1,2, or 3 digits W=0.3" SOIC or 0.6" DIP; None=Standard Width
Package Type
N=DIP (Plastic)
Pattern Number (2 or 3-digit number for parts with ROM code patterns) Device Type (consists of 3 or 4-digit numbers) Prefix
ICS, AV=Standard Device
7
ICS9133X
L .008
0.029 Typ.
0.018 5 Deg. Typ. 5 5 Deg. Typ.
0.047R 0.296 0.005 0.328 0.010 0.406 0.010
0.015 x 45 Deg. Pin 1
0.020 0.041 0.003 0.010 0.092 0.005
5 Deg. Typ.
0.101 0.010 0.008 0.006
0.050 Pitch Typ. LEAD COUNT DIMENSION L 20L .504
SOIC Packages (Widebody) Ordering Information ICS9133X-01CW20
Example:
ICS XXXX-PPP M X#W
Lead Count & Package Width
Lead Count=1,2, or 3 digits W=0.3" SOIC or 0.6" DIP; None=Standard Width
Package Type
W=DIP (Plastic)
Pattern Number (2 or 3-digit number for parts with ROM code patterns) Device Type (consists of 3 or 4-digit numbers) Prefix
ICS, AV=Standard Device
8
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.

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