integrated circuit systems, inc. general description features ics9133x ics reserves the right to make changes in the device data identified in this publica tion 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. 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 e xternal 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 te rmination 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. ? 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 ics9133xreva052897p block diagram 32 khz motherboard frequency generator 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.
2 ics9133x pin configuration decoding table for cpu clock pin descriptions * only at 5v supply voltage 20-pin pdip or soic pin number pin name type description 1 32 khz output 32.768 khz buffered output, powered by vdd32. 2 x2 output connect 32.768 khz crystal. includes internal xtal load capacitance. 3 x1 input connect 32.768 khz crystal. this pin includes internal xtal load capacitance and feedback bias for a 32.768 khz crystal. 4 vdd32 - 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 - ground. 11 oe input oe tristate outputs when low. has internal pull-up. 12 vdd - power supply (+3.3 to +5.0v). 13 14.318 mhz output 14.318 mhz clock 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. sclk22 sclk21 sclk20 2xcpu cpu 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 8 16 32 40 50 66.6 80* 100* 4 8 16 20 25 33.3 40* 50*
3 ics9133x block diagram for ics9133x recommended external circuit reference clock 32.768 khz crystal 32.768 khz 14.318 mhz 14.318 mhz clock generator output buffers cpu oe 16 mhz
12 mhz
24 mhz cpu clock 2xcpu peripheral clocks output buffers output buffers frequency select 3 / 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 exte rnally. 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. 20
19
18
17
16
15
14
13
12
11 1
2
3
4
5
6
7
8
9 10 0.1f 0.1f 0.1f 2.2f 0.1f (note 3) 32.768 khz vddx (note 4) vdd ic s 9 1 3 3 x
4 ics9133x electrical characteristics at 3.3v opera ting v dd = +3.0v to 3.7v; t a =0c to 70c unless otherwise stated 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. 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 de vice. 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. dc characteristics parameter symbol test conditions min typ max units input low voltage v il - - 0.2v dd v input high voltage v ih 0.7v dd --v input low current i il v in =0v (pull-up) -12 - - a input high current i ih v in =v dd -2-2a output low voltage 1 v ol i ol =4ma - - 0.1 v output high voltage 1 v oh i oh =-1ma v dd -.1v - - v output high current 1 v oh i oh =-4ma - - - v output high current 1 v oh i oh =-8ma 2.4 - - v output frequency change over supply and temperature 1 f d with respect to typical frequency 1 - .005 0.05 % short circuit current 1 i sc each output clock - 15 - ma supply current i dd no load, 40 mhz - 10 - ma v dd 32 supply current i dd 32 no load, v dd 32=3.7v - 5 12 a v dd 32 supply voltage v dd 32 v dd =0 to 3.7v, 32 khz output operating 2.0- -v pull-up resistor value rpu - 620 - k? ac characteristics input clock rise time 1 t icr --5s input clock fall time 1 t icf --5s output rise time 1 t r 15pf load, 0.8 to 2.0v - 1.5 2 ns rise time 1 t f 15pf load, 20% to 80% v dd - 2.54ns output fall time 1 t f 15pf load, 2.0 to 0.8v - 1.5 2 ns fall time 1 t f 15pf load, 80% to 20% v dd - 2.54ns duty cycle 1 d t 15pf load @ v th =1.4v 43/57 48/52 57/43 % duty cycle, reference clocks 1 d t 15pf load @ 1.4v 2 40/60 43/57 60/40 % jitter, one sigma 1 as compared with clock period. - 1 3 % jitter, absolute 1 t jab -25% input frequency 1 f i 25 32.768 40 khz clock skew between any clock #2 outputs 1 t sk - 100 500 ps power-up time 1 t pu from off to 40 mhz - 1,000 - ms
5 ics9133x electrical characteristics at 5v v dd = +5.0v 10%; t a =0c to 70c unless otherwise stated 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. dc characteristics parameter symbol test conditions min typ max units input low voltage v il --0.2v dd v input high voltage v ih 0.7v dd --v input low current i il v in =0v (pull-up) -15 - - a input high current i ih v in =v dd -2 - 2 a output low voltage 1 v ol i ol =4ma - - 0.1 v output high voltage 1 v oh i oh =-1ma v dd -.1v - - v output high voltage 1 v oh i oh =-4ma - - - v output high voltage 1 v oh i oh =-8ma 2.4 - - v output frequency change over supply and temperature 1 f d with respect to typical frequency 1 - .005 0.05 % short circuit current 1 i sc each output clock - 33 - ma supply current i dd no load, 40 mhz - 17 - ma v dd 32 supply current i dd 32 no load, v dd 32=5.5v - 7.5 20 a v dd 32 supply voltage v dd 32 v dd =0 to 5.5v, 32 khz output operating 2.0- -v pull-up resistor value r pu -380-k? ac characteristics input clock rise time 1 t icr --5s input clock fall time 1 t icf --5s output rise time 1 t r 15pf load, 0.8 to 2.0v - 1 1.5 ns rise time 1 t r 15pf load, 20% to 80% v dd -23ns output fall time 1 t f 15pf load, 2.0 to 0.8v - 1 1.5 ns fall time 1 t f 15pf load, 80% to 20% v dd -23ns duty cycle 1 d t 15pf load @ v th =1.4v 43/57 48/52 57/43 % duty cycle, reference clocks 1 d t 15pf load @ 1.4v 2 40/60 43/57 60/40 % jitter, one sigma 1 t j1s as compared with clock period. -13% jitter, absolute 1 t jab -25% input frequency 1 f i 25 32.768 40 khz clock skew between any clock #2 outputs 1 t sk - 100 500 ps power-up time 1 t pu from off to 40 mhz - 10 - ms
6 ics9133x typical 32 khz supply current 14 12 10 a 8 6 4 2 0 0123 vdd 456 c l = 25pf c l = 15pf c l = 0pf
7 ics9133x 20-pin dip package ordering information package information 1.025 0.260 0.325 0.010 0.360 0 ~ 5 0.130 0.015
min 0.060 0.018 0.100 0.130 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) device type (consists of 3 or 4-digit numbers) prefix ics, av=standard device pattern number (2 or 3-digit number for parts with rom code patterns)
8 ics9133x 5 deg. typ. lead count dimension l 20l .504 0.101 0.010 0.328 0.010 0.015 x 45 deg. 0.406 0.010 0.020 0.092 0.005 0.041 0.003 0.296 0.005 0.010 0.050
pitch typ. 0.008 0.006 5 deg. typ. 5 5 deg. typ. l .008 0.029
typ. 0.018 0.047r pin 1 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) device type (consists of 3 or 4-digit numbers) prefix ics, av=standard device pattern number (2 or 3-digit number for parts with rom code patterns) ics reserves the right to make changes in the device data identified in this publica tion 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.
|
