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integrated circuit systems, inc. 9154A 0174f?07/25/11 low-cost 16-pin frequency generator the 9154A is a 0.8mm version of the industry leading 9154. like the 9154, the 9154A is a low-cost frequency generator designed for general purpose pc and disk drive applications. however, because the 9154A uses 0.8mm technology and the latest phase-locked loop architecture, it offers performance advantages that enable the device to be sold into p entium? systems. the 9154A guarantees a 45/55 duty cycle over all frequencies. in addition, a worst case jitter of 250ps is specified at pentium frequencies. the cpu clock offers the unique feature of smooth, glitch- free transitions from one frequency to the next, making this the ideal device to use when slowing the cpu speed. the 9154A makes a gradual transition between frequencies so that it obeys the intel cycle-to-cycle timing specifications for 486 and pentium systems. the 9154A -42 and 9154A -43 devices offer features specifically for green pcs. the 9154A -42 and -43 have a single pin that, when pulled low, will smoothly slow the 2xcpu clock to 8 mhz. this is ideal for dynamic dx microprocessors. the 9154A -43 not only has the slow clock feature, but also offers a glitch-free stop clock for static sx microprocessors. the stopclk# pin, when pulled low, enables the 2xcpu clock to go low only after completing its last full cycle. the clock continues to run internally, and will be output again on the first full cycle immediately following stop clock disable. the simultaneous 2x and 1x cpu clocks offer controlled skew to within 500ps of each other (-42 only). ics has been shipping motherboard frequency generators since april 1990, and is the leader in the area of multiple output clocks on a single chip. consult ics for all your clock generation needs. ? compatible with 386, 486 and pentium cpus ? 45/55 duty cycle ? runs up to 66 mhz at 3.3v ? single pin can slow clock to 8 mhz (on -42 and -43) ? single pin can stop the cpu clock glitch-free (on -43) ? very low jitter, 250ps for pentium frequencies ? 1x and 2x cpu clocks skew controlled to 250ps (-42 only) ? smooth transitions between all cpu frequencies ? slow frequency ramp at power-on avoids cpu lock-up ? 16-pin 150-mil skinny soic packages ? 0.8 m cmos technology applications computer motherboards: the 9154A replaces crystals and oscillators, saving board space, component cost, part count and inventory costs. it produces a switchable cpu clock and up to four fixed clocks to drive floppy disk, communications, super i/o, bus, and/or keyboard devices. the small package and 3.3v operation is perfect for handheld computers. features general description block diagram
2 integrated circuit systems, inc. 9154A 0174f?07/25/11 pin configuration 16-soic 9154A-27cs16 16-soic 9154A-42cs16 16-soic 9154A-43cs16 description of new pin: slowclk# forces 2xcpuclk output to ramp smoothly to 8mhz and cpuclk output to 4 mhz when pulled low. description of new pis: slowclk# forces 2xcpuclk output to ramp smoothly to 8mhz when pulled low. stopclk# provides gilitch-free stop of the 2xcpuclk output when pulled low. when raised back high, the 2xcpuclk output clock resumes full speed operation (no clock frequency ramp up since the internal vco is not stopped). 16-soic 9154A-04cs16 16-soic 9154A-10cs16 16-soic 9154A-26cs16 obsolete
3 integrated circuit systems, inc. 9154A 0174f?07/25/11 stop clock feature the 9154A -43 incorporates a unique stop clock feature compatible with static logic processors. when the stop clock pin goes low, the 2xcpuclk will go low after the next occurring falling edge. when stopclk again goes high, 2xcpuclk resumes on the next rising edge of the internal clock. this feature enables fast, glitch-free starts and stops of the 2xcpuclk and is guaranteed that the cpu does not receive any short period clocks. 2xcpuclk stopclk#
4 integrated circuit systems, inc. 9154A 0174f?07/25/11 pin descriptions frequencies based upon 14.318 mhz input) note: internal pull-up resistors. * -04 and -10 have no pull-ups or frequency select pins ** -10 has no pull-up or pin 9 pdfclk -4 -10 -26 -27 -42 -43 444444 vdd pdigital power (3.3 or 5v). 13 13 13 13 13 13 vdd p digital power (3.3 or 5v). 555555 gnd pdigital ground. 12 12 12 12 12 12 gdd p digital ground. 888888 agnd panalog ground. 1161161 1 fs0 i frequency select 0 for cpu clock (has internal pull-up).* 16 15 16 15 16 16 fs1 i frequency select 1 for cpu clock (has internal pull-up).* 10 - 10 10 9 10 fs2 i frequency select 2 for cpu clock (has internal pull-up).* - - 9 9 - - oe i tristates outputs when low (has internal pull-up).* ----1515slowclk#i slows 2xcpu clock to 8 mhz (active low) (has internal pull-up). -----9stopclk#i stops 2xcpu clock glitch-free (active low) (has internal pull-up). 333333 x1 icrystal in. 222222 x2 ocrystal out. 11 10 11 11 10 11 14.318 mhz o 14.318 mhz reference clock output. - 7 1 - - 1.84 mhz o 1.84 mhz (comm) clock output. 6116666 24 mhz o24 mhz (floppy disk) clock output. - 6 - - - - 16 mhz o 16 mhz clock output. - - 7 7 - - 12 mhz o 12 mhz keyboard clock output. 7 1 - - 7 7 8 mhz o 8 mhz keyboard clock output. 14 14 14 - 11 - cpuclk o cpu clock output. 15 - 15 14 14 14 2xcpuclk o 2x cpu clock output. 9----- pd# ipower-down all (active low) (has internal pull-up). - 9 - - - - pdfclk# i power-down fixed clock (1.84, 8, 16, 24) (active low).* pin number pin name type description
5 integrated circuit systems, inc. 9154A 0174f?07/25/11 fixed clock output actual frequencies (using 14.318 mhz input, all frequencies in mhz) 14.318 1.84 24.0 12.0 8.0 -10 2xcpu cpu cpuclk 0 100* 50* pdcpu 180*40*40 2 66.6 33.3 50 3502566.6 44020 - 53216 - 62412 - 7168 - - clock tables in mhz for -04 and -10 (using 14.318 mhz input, all frequencies in mhz) -04 fs(3:0) fs(2:0) 2xcpu (mhz) cpuclk (mhz) 0 100.23* 50.11 1 80.18* 40.09 2 66.48* 33.24 3 50.11 25.06 4 40.09 20.05 5 32.22 16.11 6 24.23 12.12 7 15.75 7.88 clock table for 9154A-26 (using 14.318 mhz input, all frequencies in mhz) -43 2xcpuclk 2xcpuclk cpuclk ^ 0 0 0 75* 16 8 16 0 0 1 32 40 20 40 0 1 0 60 33.33 16.67 33.33 0 1 1 40 25 12.5 25 1 0 0 50 60 30 60 1 0 1 66.66 20 10 20 1 1 0 80* 66.66 33.33 66.66 1 1 1 52 50 25 50 -43 2xcpuclk cpuclk 2xcpuclk 0 0 0 75.17* 16.00 8.00 16.00 0 0 1 31.94 40.09 20.05 40.09 0 1 0 60.14 33.41 16.71 33.41 0 1 1 40.09 25.06 12.55 25.06 1 0 0 50.11 60.14 30.07 60.14 1 0 1 66.48 20.05 10.03 20.05 1 1 0 80.18* 66.48 33.24 66.48 1 1 1 51.90 50.11 25.06 50.11 actual frequencies (using 14.318 mhz input, all frequencies in mhz) fs2 fs1 fs0 -27 2xcpuclk -42 -42 clock tables (using 14.318 mhz input, all frequencies in mhz) fs2 fs1 fs0 -27 2xcpuclk
6 integrated circuit systems, inc. 9154A 0174f?07/25/11 absolute maximum ratings v dd referenced to gnd .......................................................................... 7.0 v voltage on i/o pins referenced to gnd . . . . . . . gnd - 0.5 v to vdd + 0.5 v operating temperature under bias . . . . . . . . . . 0 to +70 oc power dissipation . . . . . . . . . . . . . . . . . . . . . . . . 0.5 w storage temperature . . . . . . . . . . . . . . . . . . . . . -40 to +150 oc stresses above those listed under absolute maximum ratings may cause permanent damage to the device. these ratings are stess specifications only and functional operation of the device at these or any other conditions above those listed in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect product reliability. v dd = 3.3 v 10%, t a = 0 - 70 o c unless otherwise stated electrical characteristics at 3.3 v notes: 1. parameter is guaranteed by design and characterization. parameter symbol test conditions min typ max units input low voltage vil - - 0.2 vdd v input high voltage vih 0.7 v - - v input low current iil vin = 0v (pull-up pin) - 2.5 7 a input high current iih vin = vdd -5 - 5 a output low voltage vol iol = 6ma - 0.05 vdd 0.1 vdd v output high voltage1 voh ioh = -4ma 0.85 vdd 0.94 vdd - v output low current1 iol vol = 0.2vdd 15 24 - ma output high current1 ioh voh = 0.7vdd - -13 -8 ma supply current idd unloaded, 60 mhz - 16 34 ma output frequency change over supply and temperature1 fd with respect to typical frequency - 0.002 0.01 % short circuit current1 isc each output clock 20 30 - ma input capacitance1 ci except x1, x2 - - 10 pf load capacitance1 cl pins x1, x2 - 20 - pf pull-up resistor1 rpu at vdd - 0.5v - 620 900 k ohm dc characteristics
7 integrated circuit systems, inc. 9154A 0174f?07/25/11 electrical characteristics at 3.3 v v dd = 3.3 v 10%, t a = 0 - 70 o c unless otherwise stated notes: 1. parameter is guaranteed by design and characterization. not subject to production testing. ac characteristics parameter symbol test conditions min typ max units input clock rise time 1 t icr - - 20 ns input clock fall time 1 t icf - - 20 ns rise time, 20% to 80% v dd 1 t r 15pf load - 2.2 3.5 ns fall time, 80% to 20% v dd 1 t f 15pf load - 1.2 2.5 ns duty cycle at 50% v dd 1 d t 15pf load 40/60 48/52 60/40 % duty cycle, reference clocks 1 d t 15pf load 50/65 43/57 65/50 % jitter, one sigma, 20- 66 mhz clocks 1 t j1s 10,000 cycles - 100 200 ps jitter, one sigma, clocks below 20 mhz 1 t jls 10,000 cycles - 1.0 2.0 % jitter, absolute, 20-66 mhz clocks 1 t jab 10,000 cycles -350 - 350 ps jitter, absolute, clocks below 20 mhz 1 t jab 10,000 cycles - 1.5 4.0 % input frequency 1 f in 214.31832mhz maximum output frequency 1 f out 70 - - mhz clock skew between cpu and 2xcpu outputs 1 t sk 9154A-42 - 220 500 ps power-up time 1 t tpo off to 50 mhz - 6 12 ms frequency transition time 1 t ft from 8 to 50 mhz - 4.5 10 ms
8 integrated circuit systems, inc. 9154A 0174f?07/25/11 dc characteristics parameter symbol test conditions min typ max units input low voltage v il v dd =5 v - - 0.8 v input high voltage v ih v dd =5 v 2.0 - - v input low current i il v in =0 v (pull-up pin) - 6 15 a input high current i ih v in = v dd -5 - 5 a output low voltage v ol i ol = 10 ma - 0.15 0.4 v output high voltage 1 v oh i oh = -30 ma 2.4 3.7 - v output low current 1 i ol v ol = 0.8 v 25 45 - ma output high current 1 i oh v oh = 2.4 v - -53 -35 ma supply current i dd unloaded, 66 mhz - 25 50 ma output frequency change over supply and temperature 1 f d with respect to typical frequency - 0.002 0.01 % short circuit current 1 i sc each output clock 25 40 - ma input capacitance 1 c i except x1, x2 - - 10 pf load capacitance 1 c l pins x1, x2 - 20 - pf pull-up resistor 1 r pu a + v dd -1 v - 400 700 k ohm electrical characteristics at 5.0 v notes: 1. parameter is guaranteed by design and characterization. not subject to production testing. v dd = +5 10% v, t a = 0 - 70 o c unless otherwise stated
9 integrated circuit systems, inc. 9154A 0174f?07/25/11 electrical characteristics at 5.0 v v dd = +5 10% v, t a = 0 - 70 o c unless otherwise stated ac characteristics parameter symbol test conditions min typ max units input clock rise time 1 t icr --20ns input clock fall time 1 t icf --20ns output rise time, 0.8 to 2.0v 1 t r 15pf load - 1.5 2 ns rise time, 20% to 80% v 1 t r 15pf load - 2.0 3 ns output fall time, 2.0 to 0.8v 1 t f 15pf load - 0.5 1.5 ns fall time, 80% to 20% v 1 t f 15pf load - 2.0 3.0 ns duty cycle at 1.4v 1 d t 15pf load, v dd = 5v5% 45/55 48/52 55/45 % duty cycle, reference clocks 1 d t 15 pf load 40/65 43/57 65/40 % jitter, one sigma, 20 mhz- 80 mhz clocks 1 t j1s 10,000 cycles - 70 140 ps jitter, one sigma, clocks below 20 mhz 1 t jls 10,000 cycles - 0.8 2.0 % jitter, absolute, 20 mhz- 80 mhz clocks 1 t jab 10,000 cycles -250 - 250 ps jitter, absolute, clocks below 20 mhz 1 t jab 10,000 cycles - 1.0 3.0 % input frequency f in 2 14.318 32 mhz maximum output frequency 1 f out 140 - - mhz clock skew between cpu and 2xcpu outputs 1 t sk 9154A-42 - 140 400 ps power-up time 1 t tpo to 80 mhz - 8 15 ms frequency transition time 1 t ft from 8 to 66.66 mhz - 6.5 12 ms notes: 1. parameter is guaranteed by design and characterization. not subject to production testing.
10 integrated circuit systems, inc. 9154A 0174f?07/25/11 0.390 0.031 0.024 0.016 0.050 0.063 0.0060.004 0.238 0.154 0.008 0.015 0.025 16-pin soic package ordering information 9154A-27cs16 9154A-42ms16lf 9154A-04cs16 9154A-10cs16 example: lead free, rohs compliant (optional) lead count package type s = soic pattern number (2 digit number for parts with rom-code patterns) device type 9154A - ppx s 16 lf 9154A-43cs16
11 integrated circuit systems, inc. 9154A 0174f?07/25/11 revision history rev. issue date description page # c 4/6/2006 added lf ordering information 10 d 1/24/2008 removed dip ordering information. - e 3/18/2008 removed reference to "av". - f 7/25/2011 updated ordering info for -42

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