abe0101/02/04/06 low emi spread spectr um multiplier clock 30332 esperanza., rancho santa margarita, ca 92688 ph: 949-546-8000 fax: 949-546-8001 www.abracon.com 03/21/05 page 1 features ? spread spectrum clock generator with selectable multiplier from 1x to 6x outputs. ? output frequency ranges: 10mhz to 180mhz. ? accepts input from crystal or reference clock. ? selectable center, down or asymmetric spread modulation. ? selectable modulation rate. ? ttl/cmos compatible outputs. ? 3.3v operating voltage. ? low short term jitter. ? available in 8-pin 150mil soic. description the abe0101/02/04/06 are spread spectrum clock generators designed for the purpose of reducing emi in high-speed digital systems. any output frequency from 10 to 180mhz can be selected by programming 6 multiplier modes. the dev ice is designed to operate from a crystal or reference clock input and provides 1x to 6x modulated clock outputs. pin configuration note: ^: internal pull-up resistor (120k ? for sd, 30 k ? for sc0-sc2). *: the value of sd is latched upon power-up. the internal pull-up resistor resu lts in a default high value when no pull-down resistor is connected to this pin (recommended external pull-down resistor of 27 k ? ). output clock (fout) selection sst modulation sd sc2 sc1 sc0 fout (01) fout (02) fout (04) fout (06) magnitude freq. type 1 0 0 0 x1 x2 x4 x6 0.50% c 0.25% 1 0 0 1 x1 x2 x4 x6 c 0.5% 0 0 0 1 x1 x2 x4 x6 1.00% d -1.0% 1 0 1 0 x1 x2 x4 x6 c 0.75% 0 0 1 0 x1 x2 x4 x6 1.50% a +0.25% ~ -1.25% 1 0 1 1 x1 x2 x4 x6 c 1.0% 0 0 1 1 x1 x2 x4 x6 2.00% a +0.5% ~ -1.5% 1 1 0 0 x1 x2 x4 x6 c 1.25% 0 1 0 0 x1 x2 x4 x6 2.50% a +0.75% ~ -1.75% 1 1 0 1 x1 x2 x4 x6 c 1.5% 0 1 0 1 x1 x2 x4 x6 3.00% a +1.0% ~ -2.0% 1 1 1 0 x1 x2 x4 x6 c 1.75% 0 1 1 0 x1 x2 x4 x6 3.50% a +1.25% ~ -2.25% 1 1 1 1 x1 x2 x4 x6 off fin / 512 notes: c: center spread. a: asymmetric spread. d: down spread. abe010x 1 2 3 45 6 7 8 xin/fin xout/sd*^ sc0^ sc1^ vdd fout gnd sc2^ xin/fin = 10 ~ 30 mhz
abe0101/02/04/06 low emi spread spectr um multiplier clock 30332 esperanza., rancho santa margarita, ca 92688 ph: 949-546-8000 fax: 949-546-8001 www.abracon.com 03/21/05 page 2 block diagram pin descriptions name number type description xin/fin 1 i crystal input to be connected to fundamental parallel mode crystal.(c l =18pf) or clock input. xout/sd 2 b at power-up, this pin is an input pin to select modulation type. after input sampling, this pin is crystal output. has internal pull up resistor. sc0 3 i digital control input to select modulation magnitude. has internal pull-up. sc1 4 i digital control input to select modulation magnitude. has internal pull-up. gnd 5 p ground. fout 6 o modulated clock frequency output. the frequency before modulation is synthesized by multiplying the input frequency by 1x, 2x, 4x, 6x depending on the part number (abe0101, 02, 04, 06). sc2 7 i digital control input to select modulation magnitude. has internal pull-up. vdd 8 p power supply. functional description selectable spread spectrum and modu lation magnitudes the abe0101/02/04/06 provides selectable spread spectrum modulation type, as well as selectable modulation magnitude. selection is made by connecting specific pins to a logical ?zero? or ?one? according to the output clock selection table on page 1. in order to reduce the number of pins on the chip, th e abe0101/02/04/06 uses pin 2 (xout/sd) as a bi-directional pin. the pin serves as modulation type selector input (sd) upon power-up (see output clock selection table on page 1), and as xout crystal connection as soon as the input has been latched. pins 3 (sc0), 4 (sc1), and 7 (sc2) are used as inputs to select the spread spectr um modulation magnitude as shown on the output clock selection table (page 1). xtal osc fout xin/fin xout sc(0:2) pll sst control logic
abe0101/02/04/06 low emi spread spectr um multiplier clock 30332 esperanza., rancho santa margarita, ca 92688 ph: 949-546-8000 fax: 949-546-8001 www.abracon.com 03/21/05 page 3 connecting a selection pi n to a logical ?one? all selection pins have an internal pull-up resistor (30k ? for pins 3, 4, 7, and 120k ? for pin 2). this internal pull-up resistor will pull the input value to a logical ?one? (pull-up) by default, i.e. when no resistive load is connected between the pin and gnd. no external pull-up resistor is therefore required for connecting a logical ?one? upon power-up. connecting a selection pin to a logical ?zero? for an input only pin, i.e. pins 3 (sc0), 4 (sc1), and 7 (sc2), the pin simply needs to be grounded to pull the input down to a logical ?zero?. connecting the bi -directional pin (sd) to a logical ?zero? will however require the use of a 27k ? loading resistor between the pin and gnd. electrical specifications 1. absolute maximum ratings parameters symbol min. max. units supply voltage v dd 4.6 v input voltage, dc v i -0.5 v dd +0.5 v output voltage, dc v o -0.5 v dd +0.5 v storage temperature t s -65 150 c ambient operating temperature* t a -40 85 c junction temperature t j 125 c lead temperature (soldering, 10s) 260 c esd protection, human body model 2 kv exposure of the device under conditions beyond the limits specif ied by maximum ratings for extended periods may cause permanent damage to the device and affect product reliability. thes e conditions represent a stress rating on ly, and functional operations of the devic e at these or any other conditions above the operational limits noted in this spec ification is not implied. * note : operating temperature is guaranteed by design for all parts (commercial and industrial), but tested for commercial grade only . 2. timing characteristics parameters symbol conditions min. typ. max. units rise time t r measured at 0.8v ~ 2.0v @ 3.3v 0.8 0.95 1.1 ns fall time t f measured at 2.0v ~ 0.8v @ 3.3v 0.78 0.85 0.9 ns output duty cycle d t 45 50 55 % cycle to cycle jitter t cyc-cyc fout=48mhz @ 3.3v 100 ps cycle to cycle jitter t cyc-cyc fout=72mhz @ 3.3v 100 ps
abe0101/02/04/06 low emi spread spectr um multiplier clock 30332 esperanza., rancho santa margarita, ca 92688 ph: 949-546-8000 fax: 949-546-8001 www.abracon.com 03/21/05 page 4 3. dc/ac specifications parameters symbol conditions min. typ. max. units supply voltage v dd 2.97 3.63 v input high voltage v ih 0.7*vdd v input low voltage v il 0.3*vdd v input high current i ih 100 a input low current i il 100 a output high voltage v oh i oh =5ma, vdd=3.3v 2.4 output low voltage v ol i ol =6ma, vdd=3.3v 0.4 f xin when using a crystal 10 30 mhz input frequency f in when using reference clock 10 30 mhz maximum interruption of f in when using reference clock 100 s load capacitance c l between pin xin and xout * 18 pf pull-up resistor r up pin 2 120 k ? pull-up resistor r up pin 3, 4, 7 30 k ? short circuit current i sc 50 ma 3.3v dynamic supply current i cc no load 20 ma *note: pin xin and xout each has a 36pf capacitance. when used with a xtal, the two capacitors combined load the crystal with 18pf. i f driving xin with a reference clock signal, the lo ad capacitance will be 36pf (typical).
abe0101/02/04/06 low emi spread spectr um multiplier clock 30332 esperanza., rancho santa margarita, ca 92688 ph: 949-546-8000 fax: 949-546-8001 www.abracon.com 03/21/05 page 5 package information ordering information abracon corporation, reserves the right to make changes in its products or specifications, or bo th at any time without notice. the information furnished by abracon is believed to be accurate and reliable. however, abracon makes no guarantee or warranty concerning the a ccuracy of said information and shall not be responsible for any loss or damage of whatever nature resulting from the use of, or reliance upon this product. life support policy : abracon?s products are not authorized for use as critical comp onents in life support devices or systems without the express written approval of the president of abracon corporation. for part ordering, please contact our sales department: 30332 esperanza., rancho santa margarita, ca 92688 ph: 949-546-8000 fax: 949-546-8001 part number the order number for this device is a combination of de vice number, package type and operating temperature range abe010x x c order number marking package option abe0101sc- t abe0101sc soic -tape and reel abe0101sc abe0101sc soic -tube abe0102sc- t abe0102sc soic -tape and reel abe0102sc abe0102sc soic -tube ABE0104sc- t ABE0104sc soic -tape and reel ABE0104sc ABE0104sc soic -tube abe0106sc- t abe0106sc soic -tape and reel abe0106sc abe0106sc soic -tube part number temperature c=commercial i=industrial package type s=soic c l a 8 pin narrow soic ( mm ) soi c symbol min. max . a 1.47 1.73 a1 0.10 0.25 b 0.33 0.51 c 0.19 0.25 d4.80 4.95 e 3.80 4.00 h 5.80 6.20 l 0.38 1.27 e 1.27 bsc e h d a1 e b
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