integrated circuit systems, inc. features general description ics9120-53 frequency generator for cd-rom systems 9120-53 rev b 052497p block diagram ? generates 33.8688 mhz or 42.83 mhz decode clocks plus the 12 and 24 mhz fixed clocks ? single 8.4672 mhz crystal or system clock reference ? 200ps one sigma jitter maintains 16-bit performance ? output rise/fall times less than 2.0ns ? on-chip loop filter components ? 3.3v-5v supply range ? 8-pin, 150-mil soic applications ? specifically designed to support the high performance requirements of cd-rom drive systems the ics9120-53 is a high performance frequency generator designed to support digital compact disk drive systems. it offers all clock frequencies required for the servo and decoder sections of these devices. these frequencies are synthesized from a single 16.9344 mhz on-chip oscillator. high accuracy, low jitter plls meet the 150 ppm frequency tolerance required by these systems. fast output clock edge rates minimize board induced jitter. unlike competitive devices, the ics9120-53 operates over the entire 3.0-5.5v range. pin configuration 8-pin soic functionality x1, x2 (m hz) fs divisor clk1 8.4672 0 x123 33.8688 86.4672 1 x616 42.83 clock x1, x2 (m hz) divisor output (m hz) 12m 8.4672 x52112 20.0134 24m 8.4672 x5211 40.0268 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.
2 ics9120-53 pin descriptions pin number pin name type description 1 x1 input crystal or external clock source. has feedback bias for crystal. 2 vdd power +power supply input. 3 gnd power ground return for pin 2. 4 20m output 12 mhz fixed output clock. 5 clk1 output 33.8/42.83 mhz selectable clock output. 6 40m output 24 mhz fixedoutput clock. 7 fs input input selector for clk1. 8 x2 output crystal output drive.
3 ics9120-53 absolute maximum ratings electrical characteristics at 5 v v dd = +4.5 to +5.5 v, t a = 0 to 70 o c unless otherwise stated * parameter is guaranteed by design and characterization. not 100% tested in production. avdd, vdd referenced to gnd .......................................................................... 7v operating temperature under bias .................................................... 0 o c to +70 o c storage temperature ..................................................................... -65 o c to +150 o 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. dc characteristics parameter symbol test c onditions min typ max units input low voltage v il --0.8v input high voltage v ih 2.0 - - v input low current i il v in =0v -18.0 -8.3 - a input high current i ih v in =v dd --5.0a output low voltage v ol *i ol =+10ma - 0.15 0.4 v output high voltage v oh *i oh =-30ma 2.4 3.7 - v output low current i ol *v ol =0.8v 25.0 45.0 - ma output high current i oh *v oh =2.4v - -53.0 -35.0 ma supply current i dd unloaded - 24.0 50.0 ma pull-up resistor value r pu * - 400.0 800.0 k ohm ac characteristics rise time t r * 15pf load, 0.8 to 2.0v - 0.9 2.0 ns fall time t f * 15pf load, 2.0 to 0.8v - 0.7 1.5 ns rise time t r * 15pf load, 20% to 80% - 1.8 3.25 ns fall time t f * 15pf load, 80% to 20% - 1.4 2.5 ns duty cycle d t * 15pf load @ 50% of vdd 45.0 50.0 55.0 % jitter, one sigma t jis * for all frequencies - 100.0 200.0 ps jitter, absolute t jab * for all frequencies -500.0 300.0 500.0 ps jitter, one sigma t jis * refclk only - 266.0 450.0 ps jitter, absolute t jab * refclk only -1200 750.0 1200 ps input frequency range f i * 8.0 8.4 10.0 mhz output frequency range f o * 11.0 - 42.0 mhz output mean frequency accuracy vs. target f oa * with 8.4672 mhz input -0.125 - -0.04 % power-up time t pu * 0 to 33.8 m hz - 5.5 12.0 ms crystal input capacitance c inx * x1 (pin 1), x2 (pin 8) -5 5 - pf
4 ics9120-53 electrical characteristics at 3.3 v v dd = +3.0 to +3.7 v, t a = 0 o c-70 o c unless otherwise stated * parameter is guaranteed by design and characterization. not 100% tested in production. 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 -8.0 -3.6 - a input high current i ih v in =v dd - - 5.0 a output low voltage v ol *i ol =6.0ma - 0.05v dd 0.1 v output high voltage v oh *i oh =4.0ma 0.85v dd 0.94v dd -v output low current i ol *v o l=0.2v dd 15.0 24.0 - ma output high current i oh *v oh =0.7v dd - -13.0 -8.0 ma supply current i dd unloaded - 16.0 40.0 ma pull-up resistor value r pu * - 620.0 900.0 k ohm ac characteristics rise time tr* 15pf load 0.8 to 2.0v - 1.5 4.0 ns fall time t f * 15pf load 2.0 to 0.8v - 1.0 3.0 ns rise time t r * 15pf load 20% to 80% - 2.2 4.0 ns fall time t f * 15pf load 80% to 20% - 1.5 3.0 ns duty cycle d t * 15pf load @ 50% ofvdd 45.0 50.0 55.0 % jitter, one sigma t jis * for all frequencies - 150.0 200 ps jitter absolute t jab * for all frequencies -550.0 330.0 550.0 ps input frequency range f i * 8.0 8.4 10.0 mhz output frequency range f o * 11.0 - 38.0 mhz output mean frequency accuracy vs. target f oa * with 8.4672 mhz input -0.125 - -0.04 % power-up time t pu* 0 to 33.8 mhz - 5.5 12.0 ms crystal input capacitance c inx* x1 (pin 1), x2 (pin 8) -5-pf
5 ics9120-53 ordering information ics9120m-53 0.194 0.031 0.024 0.016 0.050 0.006
0.004 0.238 0.154 0.015 0.063 0.025 0.008 8-pin soic package example:
ics xxxx m-ppp package type
m =soic 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 pattern) 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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