ICS9133X Integrated Circuit Systems, Inc. 32 kHz Motherboard Frequency Generator General Description Features 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. • VDD32 Supply Applications 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 10µA at +3.3V with the main VDD at 0V. 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. 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. • • • • • • • • • • • • 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 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 1 32 kHz Output 32.768 kHz buffered output, powered by VDD32. 2 X2 Output 3 X1 Input 4 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. 5 VDD - Power supply (+3.3 to +5.0V). 6 GND - GROUND. 7 16 MHz Output 16 MHz clock output. 8 24 MHz Output 24 MHz clock output. 9 12 MHz Output 12 MHz clock output. 10 GND - 11 OE Input 12 VDD - 13 14.318 MHz Output 14 GND - GROUND. 15 VDD - Power supply (+3.3 to +5.0V). 16 2XCPU Output 2XCPU clock output (see decoding table). 17 CPU Output CPU clock output (see decoding table). 18 SCLK2 Input CPU clock frequency SELECT2. Has internal pull-up. 19 SCLK1 Input CPU clock frequency SELECT1. Has internal pull-up. 20 SCLK0 Input CPU clock frequency SELECT0. Has internal pull-up. DESCRIPTION GROUND. OE tristate outputs when low. Has internal pull-up. Power supply (+3.3 to +5.0V). 14.318 MHz clock output. 2 ICS9133X Block Diagram for ICS9133X 32.768 kHz crystal Reference Clock 32.768 kHz 3 / Output Buffers 14.318 MHz Clock Generator Frequency Select 2XCPU Output Buffers CPU Clock CPU OE 14.318 MHz Output Buffers Peripheral Clocks 16 MHz 12 MHz 24 MHz Recommended External Circuit VDDX VDD 2.2µF (Note 3) 20 2 19 3 18 4 17 (Note 4) 0.1µF 0.1µF 5 IC S 9 1 3 3 X 32.768 kHz 1 6 7 16 15 0.1µF 14 8 13 9 12 10 11 0.1µF 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 ....................................................................................................................... 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. 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 =0°C to 70°C 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 SYMBOL VIL VIH IIL IIH VOL VOH VOH VOH FD ISC IDD IDD 32 VDD 32 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 Rpu MIN 0.7VDD -12 -2 VDD-.1V 2.4 - TYP .005 MAX 0.2VDD 2 0.1 0.05 UNITS V V µA µA V V V V % 2.0 15 10 5 - 12 - mA mA µA V - 620 - k½ 43/57 40/60 1.5 2.5 1.5 2.5 48/52 43/57 5 5 2 4 2 4 57/43 60/40 µs µs ns ns ns ns % % 25 - 1 2 32.768 100 3 5 40 500 % % kHz ps - 1,000 - ms AC Characteristics 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 tICr tICf tr tf tf tf dt dt 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 =0°C to 70°C unless otherwise stated DC Characteristics PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITS Input Low Voltage VIL - - 0.2VDD V Input High Voltage VIH 0.7VDD - - V Input Low Current IIL VIN=0V (Pull-up) -15 - - µA IIH VIN=VDD -2 - 2 µA Output Low Voltage1 Input High Current VOL IOL=4mA - - 0.1 V 1 Output High Voltage VOH IOH=-1mA VDD-.1V - - V Output High Voltage1 VOH IOH=-4mA - - - V Output High Voltage1 Output Frequency Change over Supply and Temperature1 VOH IOH=-8mA 2.4 - - V FD With respect to typical frequency1 - .005 0.05 % Short Circuit Current1 ISC Each output clock - 33 - mA Supply Current IDD No load, 40 MHz - 17 - mA No load, VDD32=5.5V VDD=0 to 5.5V, 32 kHz output operating - 7.5 20 µA 2.0 - - V - 380 - k½ VDD32 Supply Current IDD 32 VDD32 Supply Voltage VDD 32 Pull-up Resistor Value Rpu AC Characteristics Input Clock Rise Time1 tICr - - 5 µs Input Clock Fall Time1 tICf - - 5 µs - 1 1.5 ns Output Rise Time1 tr 15pF load, 0.8 to 2.0V Rise Time tr 15pF load, 20% to 80% VDD - 2 3 ns Output Fall Time1 tf 15pF load, 2.0 to 0.8V - 1 1.5 ns Fall Time1 tf 15pF load, 80% to 20% VDD - 2 3 ns Duty Cycle1 dt 15pF load @ Vth=1.4V 43/57 48/52 57/43 % 40/60 43/57 60/40 % - 1 3 % 1 Duty Cycle, reference clocks1 Jitter, One Sigma1 1 dt tj1s As compared with clock period. - 2 5 % fi 25 32.768 40 kHz Clock Skew between any Clock #2 outputs1 Tsk - 100 500 ps Power-up Time1 tpu - 10 - ms Jitter, Absolute Input Frequency1 tjab 15pF load @ 1.4V 2 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. 5 ICS9133X Typical 32 kHz Supply Current 14 12 CL = 25pF 10 µA CL = 15pF 8 CL = 0pF 6 4 2 0 0 1 2 3 Vdd 6 4 5 6 ICS9133X Package Information 0.260 1.025 0.130 0.015 min 0.325 0 ~ 5° 0.060 0.010 0.130 0.018 0.360 0.100 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 5 Deg. Typ. 0.101 ± 0.010 0.041 ± 0.003 0.008 ± 0.006 0.010 0.092 ± 0.005 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.