Integrated Circuit Systems, Inc. ICS9133X Advance Information 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 lap- tops 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, eliminat- ing the need for a 14.318 MHz crystal. High performance applications may require high speed clock termination compo- nents. 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 CPU clock frequency, keyboard clock, floppy disk controller clock, serial communications clock and bus clocks. Different frequencies from clocks #2 and #3 can be selected using the frequency select pins, but clock #1 will be at 14.318 MHz for all standard versions. VDD32 Supply The ICS9133X has a separate power supply for the 32.768 kHz oscillator circuitry. This allows the 32 kHz clock to run froma 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 LOA at +3.3V with the main VDD at OV. 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. Block Diagram ee Features e Single 32.768 kHz crystal generates all PC motherboard clocks Cost-reduced version of popular ICS9132 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 2x and 2x CPU clocks 20-pin PDIP or SOIC package 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 1CS9133X 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. 32.768 KHz crystal Referen Clock Clock CPUCLK rence Generator Generator 32.768 kHz<q-y Clock 1 2 > 2XCPUCLK 14.318 MHz Clock | Generator ->_- Peripheral 3 Clocks Cc-49ICS9133X Pin Configuration Decoding Table for CPU Clock | SCLK22 | SCLK21 | SCLK20 | 2xCPU | CPU 32 kHz [ T 720 + SCLKO | 0 0 0 | 8 4 0 0 ! 16 8 Le | X2 - 2 19 -SCLK1 | 0 i 0 9 6 X1-4 3 18 /- SCLK2 | 0 1 I 40 20 1 0 | 0 50 25 vDD32 + 4 17 CPU x | 1 0 i 66.6 33.3 VDD 4 5 16 F-2XxCPU fo | 1 0 80* 40* GND-+]6 & 15 --voD Ll ! 1 | 100" 50" 16MHz 47 Q 14 GND * Only at SV supply voltage 24MHz +] 8 13 14.318 MHz 12 MHz 4 9 12 /- VDD (VCCA) GND {10 11 | OF 20-Pin PDIP or SOIC K-4, K-7 Pin Descriptions PIN NUMBER PINNAME | TYPE | DESCRIPTION 1 32 kHz | Output 32.768 kHz output 7 2 |x2 Output _[Connect 32 kHz crystal ee i 3 Xt | sInput. (Connect 32 kHz crystal 7 _ 4 ~~ [VDD32, | | Power supply for 32 kHz oscillator only i 5 _|vDD Power supply (43.3t0+5.0V) 6 GND. | GROUND 7 7 | 16 MHz | Output 16MHzclock output 8 j24MHz | Output. 24 MHzclock output oe 9 |12 MHz ; Output 12 MHz clock output ee | 10. GND | - GROUND ee il OE _____| Input_ __|OE wristate outputs when low. Has internal pull-up. 12 | VDD | - Power supply (+3.3 to +5.0V) ee 13 14.318 MHz Output. _| 14.318 MHz clock output oe 14 |GND - GROUND a 15 | VDD - Power supply (+3.3 to +5.0V) a p62 XCPU | Output |2XCPU clock output (see decoding table) 17 CPU ___| __Output_| CPU clock output (see decoding table) | _18 'SCLK2 Inputs: [CPU clock frequency SELECT2. Has internal pull-up. 19 |SCLKI Input CPU clock frequency SELECT1. Has internal pull-up. L 20 SCLKO Input |CPU clock frequency SELECTO. Has interna! pull-up. | C-50ICS9133X Block Diagram for ICS9133X 32.768 kHz crystal E_] Reference Clock 32.768 kHz po Frequency Select Output 14.318 MHz Butters |] clock -> > 2xCPU uners Generator ; p> | CPU Clock Output if 1] P- CPU 14.318 MHz OE >, P 16 MHz L| Peripheral > Output Clocks Buffers P12 MHz >- $- 24 MHz Recommended External Circuit 32.768 kHz VDDX (NOTE 3) IK OO ON OO OI WD = 0.1, OL dood C 19 18 17 16 ICS91B3X Ss 15 14 13 12 11 i ies LJ 0.1uF OW 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. C-511CS9133X Absolute Maximum Ratings VDD referenced to GND .................0006, 7Vv Operating temperature under bias ............... 0C to +70C Storage temperature .......000 0.0.00... c eee ee -40C tol 50C Voltage on I/O pins referenced to GND........... GND -0.5V to VDD +0.5V Power dissipation 0.0.0... 06.00 cece cece eee 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 Vpp = +3.0 to 3.7V, Ta=0C to 70C unless otherwise stated DC Characteristics | PARAMETER | SYMBOL | TEST CONDITIONS MIN | TYP MAX UNITS Input Low Voltage vi | _ - 0.2Vpp | Vv InputHigh Voltage ss | CU 0.7Vpp - : Vf Input Low Current In Vin=0V (Pull-up) ~ [oo | 12 | HA | Input High Current Im | Vin=Vpp ot __HA Output Low Voltage Vor Hlor=4mA ~ | - Os aL v Output High Voltage Vou Ion=-1mA | Vpp-.1V - | - | Vv Output High Current Vou 'IOH=-4mA - - - Vv Output High Current | Vou TOH=-8mA_ 2.4 T - = Vv Output Frequency Change Fp With respect to typical - | 005 0.05 Fe over Supply and frequency Temperature | __ : Short circuit current Isc Bach output clock | fb - mA | Supply Current | Icc__ [No load, 40 MHz - 0 mA Pull-up resistor value | Ropu - | 620 | - kQ AC Characteristics Input Clock Rise Time tcr T ~ - to 5 ls Input Clock RiseTime | iter Fn Input Clock Fall Time ucr 4 ee ~ - 5 Ls J Output Rise time, 0.8 to 2.0V tr 15 pf load - 15 2 ns | Rise time, 20% to 80% Vpp te 15 pf load a | 25 4 | ns Output Fall time, 2.0 to 0.8V te 15 pf load ~- | 15 2 ns Fall time, 80% to 20% Vpp te {ISpfload | CK ns Duty cycle _ dr 15 pf load 43/57 48/52 57/43 % Duty cycle, reference clocks dr 15 pf load, Note | 40/60 | 43/57 60/40 | % | Jitter,one sigma As compared with | - 1 3 ! % Jitter, absolute | tiab \clock period. | - 2 5 | % Input Frequency lg _ 25 32.768 40 kHz Clock skew between any Tsk - | 100 500 ps Clock #2 outputs | | | Power-up time tou From off to 40 MHz de - L 1,000 | - LT ms NOTE 1: 32 kHz output duty cycle is dependent on crystal used. C-52ICS9133X Electrical Characteristics Vpp = +5V+10%, Ta=0C to 70C unless otherwise stated DC Characteristics PARAMETER | SYMBOL | TESTCONDITIONS | MIN TYP | MAX | UNITS Input Low Voltage VIL - - 0.2Vpp v Input High Voltage _ Vin 0.7Vpp - - Vv Input Low Current In Vin=0V (Pull-up) - - 15 pA Input High Current Trt Vin=Vppb - - 2* WA Output Low Voltage VoL ToL=4mA - - 0.1 Vv Output High Voltage Vou Ion=-I1mA Vpp-.1V - : Vv Output High Voltage Vou lon=-4mA - - - v Output High Voltage __ Vou Tou=-8mA | 24 ~ - Vv Output Frequency Change over Fp With respect to typical - 005 0.05 % Supply and Temperature frequency Short circuit current Isc Each output clock - 33 - | mA Supply Current Icc No load, 40 MHz - 17 - mA Pull-up resistor value Rpu Note 1 - 380 - kQ AC Characteristics Input Clock Rise Time tice - - 5 bs Input Clock Fall Time tice - - 5 ps Output Rise time, 0.8 to 2.0V tr 15 pf load - l 1.5 ns Rise time, 20% to 80% Vpp tr 15 pf load - 2 3 ns Output Fail time, 2.0 to 0.8V te 15 pf load - 1 1.5 ns Fall time, 80% to 20% Vpp te 15 pf load - 2 3 ns Duty cycle dt [15 pf load 43/57 48/52 87/43 % Duty cycle, reference clocks dt [15 pf load, Note 1 40/60 43/57 60/40 % Jitter, one sigma tiis As compared with clock - ! 3 % Jitter, absolute | tiab period - 2 5 % Input Frequency fj 25 32.768 40 kHz Clock skew between any Tsk - 100 500 ps Clock #2 outputs Power-up time tpu From off to 40 MHz - LO - ms NOTE 1: 32 kHz output duty cycle is dependent on crystal used. C-531CS9133X 32 kHz Supply Current 14 1 C, = 25pF 10 C, = ISpF HA 8 C, = 0pF 6 4 2 9 + + + 0 1 2 3 4 5 6 Ordering Information 1CS9133XN20 (DIP) or ICS9133XM20 (SOIC) Example: ICS XXXX M Package Type N=DIP (Plastic) M=SOIC Device Type (consists of 3 or 4 digit numbers) Prefix ICS=Standard Device C-54