motorola semiconductor technical data order number: MPC926508/d rev 2, 02/2004 ? motorola, inc. 2004 networking clock source the MPC926508 is a low cost, low jitter, high performance clock synthesizer for networking applicat ions. using analog phase-locked loop (pll) techniques, the device accepts an input to produce multi- ple output clocks for networking chips, pci devices, sdram, and asics. the MPC926508 outputs all have 0 ppm synthesis error. features ? packaged in 20 pin narrow (150 mil) ssop (qsop) ? 25 or 125 mhz fundamental clock input or 25 mhz crystal input ? two output clocks ? sdram frequencies of 100 and 133 mhz ? zero ppm synthesis error in all clocks ? full cmos output swing with 25 ma output drive capability at ttl levels ? advanced, low power, sub-micron cmos process ? 3.3v operating voltage MPC926508 sd suffix 20 lead ssop case 1461 networking clock source sel_25 out1 (100 mhz) out2 (133.33 mhz) sel_clk clock synthesis and control circuitry output buffer output buffer clock buffer / crystal oscillator vdd gnd 22 x1 x2 25 mhz or 125 mhz clock or 25 mhz crys- tal *optional crystal capacitors are shown and may be required for tuning of initial accuracy (determined once per board). f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
MPC926508 2 networking clock source motorola figure 1. MPC926508 pin assignment key: xi, xo = crystal connections; i = input with internal pull-up resistor; o = output; p = power supply connection. table 1. function table control default 0 1 sel_25 1 125 25 sel_clk 1 xtal ref_clk table 2. pin description number name type description 1x2xo crystal connection. connect to a crystal or leave unconnected for a clock input. 2nc - not connected 3 x1/iclk xi crystal connection. connect to a fu ndamental crystal or clock input. 4vddp connect to +3.3 v. must be same as other vdd. 5nc - not connected 6gndp connect to ground. 7nc - not connected 8nc - not connected 9nc - not connected 10 out1 (133.33 mhz) o 133.33 mhz output 11 sel_25 i ref_clk or xtal input selection. 12 nc - not connected 13 nc - not connected 14 gnd p connect to ground. 15 nc - not connected 16 vdd p connect to +3.3 v. must be same as other vdd. 17 out2 (100 mhz) o 100 mhz output 18 nc - not connected 19 sel_clk i 25 or 125 mhz ref_clk selection. 20 nc - not connected x2 nc x1/iclk vdd nc gnd nc nc sel_clk nc out1 (100 mhz) vdd nc 1 2 3 4 5 6 7 8 19 18 17 16 15 14 13 20 MPC926508 nc gnd nc 9 10 out2 (133.33 mhz) 12 11 nc sel_25 nc nc = not connected f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
MPC926508 motorola networking clock source 3 table 3. absolute maximum ratings a a. absolute maximum continuous ratings are those maximum values beyond which damage to the device may occur. exposure to these conditions or conditions beyond t hose indicated may adversely affect device reli ability. functional operation at absolute-maxim um-rated conditions is not implied. symbol characteristics min typ max unit condition v dd supply voltage 3.9 v referenced to gnd inputs and clock outputs -0.5 v dd + 0.5 v referenced to gnd t a ambient operating temperature 070 c t a ambient operating tem perature, i version -40 85 c industrial temp t sol soldering temperature 260 c max of 20 seconds t s storage temperature -65 150 c table 4. dc characteristics (v dd = 3.3v 10%, t a = -40 c to 85 c) symbol characteristics min typ max unit condition v ih input high voltagex1 pin only all i type inputs v dd /2+1 2 v dd /2 v v v il input low voltagex1 pin only all i type inputs v dd /2 v dd /2-1 0.8 v v v oh output high voltage 2.4 v i oh =-25 ma v ol output low voltage 0.4 v i ol = 25 ma v oh output high voltage, cmos level v dd - 0.4 v i oh =-8 ma i dd operating supply current 35 ma no load short circuit current 90 ma each output internal pull-up resistor 200 k ? sel_25, sel_clk table 5. ac characteristics (v dd = 3.3v 10%, t a = -40 c to 85 c) symbol characteristics min typ max unit condition f ref input frequency 12 25 27 mhz crystal oscillator f ref input frequency 125 mhz external input t r output clock rise time 1ns 0.8 to 2.0v t f output clock fall time 1ns 2.0 to 0.8v dc o output clock duty cycle 40 50 60 % at v dd /2 frequency error 0ppm all clocks t jit(cc) jitter (cycle-to-cycle) 300 ps variation from mean f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
MPC926508 4 networking clock source motorola applications information external components the MPC926508 requires a minimum number of external components for proper operation. decoupling capacitors of 0.01 f should be connected between each vdd and gnd (pins 4 and 6, pins 16 and 14), as close to the MPC926508 as possible. a series termination resistor of 33 ? may be used for each clock output. the crystal must be connected as close to the chip as possible. the crystal should be a fundamental mode (do not use third overtone), parall el resonant. crystal capacitors should be connected from pins x1 to ground and x2 to ground to optimize the initial accuracy. the value of these capacitors is given by the following equation, where c l is the crystal load ca- pacitance: crystal caps (pf) = (c l -6) x 2. so for a crystal with 16 pf load capacitance, two 20 pf caps should be used. f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
MPC926508 motorola networking clock source 5 package dimensions date 11/20/02 case 1467-01 issue o .337 .150 1 10 11 20 b pin 1 id 4 5 d .157 .344 4 .236 .118 .010 c a-b d 2x 10 tips bb 5 .003 h a-b d 2x a 4 .035 section b-b r.003 min .0098 .0040 .016 0? 8? 0? .010 gauge plane min 8 6 .004 c .055 seating plane .025 c 20x 18x .061 .0125 c l h 3 7 a a (.010) .012 .010 (.008) plating base metal section a-a .007 .008 m .007 c a-b d notes: 1. 2. 3. 4. 5. 6. 7. 8. dimensions are in inches. dimensioning and tolerancing per asme y14.5m, 1994. datum plane h located at mold parting line and coincident with lead, where lead exits plastic body at bottom of parting line. datum a, b and d to be detrmined where centerline between leads exits plastic body at datum plane h. this dimension does not include mold flash or protrusions, but do include mold mismatch and are measured at the mold parting line. mold flash or protrusions shall not exceed .006 inches for ends and .008 inches for sides. this dimension is length of terminal for soldering a substrate. formed leads shall be planar with respect to one another within .004 inches at seating plane. this dimension is defined as the distance from the seating plane to the lowest point of the package body. sd suffix 20-lead ssop package case 1461-01 issue o f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
6 networking clock source motorola notes f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
motorola networking clock source 7 notes f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
information in this document is provided solely to enable system and software implem enters to use motorola products. there are no express or implied copyright licenses granted hereunder to desig n or fabricate any integrated circuits or integrated circuits based on the informa tion in this document. motorola reserves the right to make changes without further noti ce to any products herein. motorola makes no warranty, represen tation or guarantee regarding the suitability of its products for any particular purpose, nor does motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. ?typical? parameters which may be provided in motorola data sheets and/or s pecifications can and do vary in different applications and actual performance may var y over time. all operating parameters, including ?typicals? must be validated for each customer application by customer?s technical experts. motorola does not convey any license under its patent rights nor the rights of others. motorola pro ducts are not designed, intended, or authorized for use as compon ents in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in whic h the failure of the motorola product could create a situation where personal injury or death may occur. should buyer purchase or use motorola products for any such unintended or unauthorized application, buyer shall indemnify and hold motorola and its officers, employees, subsidiaries, affiliates, and di stributors harmless against all claims, costs, damages, and expenses , and reasonable attorney fees arising out of, directly or indirectly, any claim of persona l injury or death associated with such unintended or unauthorized use, even if such claim a lleges that motorola was negligent regarding the design or manufa cture of the part. motorola and the stylized m logo are registered in the us patent and trademark office. all other product or service names are t he property of their respective owners. ? motorola, inc. 2004 how to reach us: usa/europe/locations not listed: japan: motorola japan ltd.; sps, technical information center motorola literature distribution 3-20-1 minami-azabu. minato-ku, tokyo 106-8573, japan p.o. box 5405, denver, colorado 80217 81-3-3440-3569 1-800-521-6274 or 480-768-2130 asia/pacific: motorola semiconductors h.k. ltd.; silicon harbour centre 2 dai king street, tai po industrial estate, tai po, n.t., hong kong 852-26668334 home page: http://motorola.com/semiconductors MPC926508 f r e e s c a l e s e m i c o n d u c t o r , i freescale semiconductor, inc. f o r m o r e i n f o r m a t i o n o n t h i s p r o d u c t , g o t o : w w w . f r e e s c a l e . c o m n c . . .
|
