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low skew, 1:6 crystal-to- lvcmos/lvttl fanout buffer ics83905 idt ? / ics ? lvcmos/lvttl fanout buffer 1 ics83905am rev. b july 9, 2007 g eneral d escription the ics83905 is a low skew, 1-to-6 lvcmos / lvttl fanout buffer and a member of the hiperclocks? family of high performance clock solutions from idt. the low impedance lvcmos/lvttl outputs are de- signed to drive 50 series or parallel terminated transmission lines. the effective fanout can be increased from 6 to 12 by utilizing the ability of the outputs to drive two series terminated lines. the ics83905 is characterized at full 3.3v, 2.5v, and 1.8v, mixed 3.3v/2.5v, 3.3v/1.8v and 2.5v/1.8v output operating supply mode. guaranteed output and part-to-part skew char- acteristics along with the 1.8v output capabilities makes the ics83905 ideal for high performance, single ended applica- tions that also require a limited output voltage. f eatures ? six lvcmos / lvttl outputs ? outputs able to drive 12 series terminated lines ? crystal oscillator interface ? crystal input frequency range: 10mhz to 40mhz ? output skew: 80ps (maximum) ? rms phase jitter @ 25mhz, (100hz - 1mhz): 0.26ps (typical) (v dd = v ddo = 2.5v) phase noise: offset noise p o w er 100hz ............. -129.7 dbc/hz 1khz ............. -144.4 dbc/hz 10khz ......... .... -147.3 dbc/hz 100khz ......... .... -157.3 dbc/hz ? 5v tolerant enable inputs ? synchronous output enables ? operating power supply modes: full 3.3v, 2.5v and 1.8v, mixed 3.3v core/2.5v output operating supply, mixed 3.3v core/1.8v output operating supply, mixed 2.5v core/1.8v output operating supply ? 0c to 70c ambient operating temperature ? available in both standard (rohs 5) and lead-free (rohs 6) packages hiperclocks? ic s xtal_out enable 2 gnd bclk0 v dd o bclk1 gnd bclk2 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 xtal_in enable 1 bclk5 v ddo bclk4 gnd bclk3 v dd ics83905 16-lead soic 3.9mm x 9.9mm x 1.38mm body package m pacakge top view 16-lead tssop 4.4mm x 5.0mm x 0.92mm body package g pacakge top view 20 19 18 17 16 6 7 8 9 10 1 2 3 4 5 15 14 13 12 11 enable 2 xtal_out xtal_in enable 1 nc bclk5 v ddo bclk4 gnd gnd gnd gnd bclk0 v ddo bclk1 gnd gnd bclk2 v dd bclk3 ics83905 20-lead vfqfn 4mm x 4mm x 0.9mm body package k package top view p in a ssignments b lock d iagram synchronize synchronize bclk0 bclk1 bclk2 bclk3 bclk4 bclk5 enable 1 enable 2 xtal_in xtal_out
idt ? / ics ? lvcmos/lvttl fanout buffer 2 ics83905am rev. b july 9, 2007 ics83905 low skew, 1:6 crystal-to-lvcmos/lvttl fanout buffer t able 1. p in d escriptions t able 2. p in c haracteristics t able 3. c lock e nable f unction t able e m a ne p y tn o i t p i r c s e d t u o _ l a t xt u p t u o. t u p t u o e h t s i t u o _ l a t x . e c a f r e t n i r o t a l l i c s o l a t s y r c n i _ l a t xt u p n i. t u p n i e h t s i n i _ l a t x . e c a f r e t n i r o t a l l i c s o l a t s y r c 2 e l b a n e , 1 e l b a n et u p n i . 3 e l b a t e e s . s l e v e l e c a f r e t n i l t t v l / s o m c v l . e l b a n e k c o l c , 2 k l c b , 1 k l c b , 0 k l c b 5 k l c b , 4 k l c b , 3 k l c b t u p t u o. s l e v e l e c a f r e t n i l t t v l / s o m c v l . s t u p t u o k c o l c d n gr e w o p. d n u o r g y l p p u s r e w o p v d d r e w o p. n i p y l p p u s e r o c v o d d r e w o p. n i p y l p p u s t u p t u o c / nd e s u n u. t c e n n o c o n s t u p n i l o r t n o cs t u p t u o 1 e l b a n e2 e l b a n e4 k l c b : 0 k l c b5 k l c b 00 w o lw o l 01 w o lg n i l g g o t 10 g n i l g g o tw o l 11 g n i l g g o tg n i l g g o t l o b m y sr e t e m a r a ps n o i t i d n o c t s e tm u m i n i ml a c i p y tm u m i x a ms t i n u c n i e c n a t i c a p a c t u p n i 4f p c d p e c n a t i c a p a c n o i t a p i s s i d r e w o p ) t u p t u o r e p ( v o d d v 5 6 4 . 3 =9 1f p v o d d v 5 2 6 . 2 =8 1f p v o d d v 2 =6 1f p r t u o e c n a d e p m i t u p t u o v o d d % 5 v 3 . 3 =7 v o d d % 5 v 5 . 2 =7 v o d d v 2 . 0 v 8 . 1 =0 1 bclk5 bclk0:4 enable2 enable1 f igure 1. e nable t iming d iagram
idt ? / ics ? lvcmos/lvttl fanout buffer 3 ics83905am rev. b july 9, 2007 ics83905 low skew, 1:6 crystal-to-lvcmos/lvttl fanout buffer t able 4a. p ower s upply dc c haracteristics , v dd = v ddo = 3.3v5%, t a = 0c to 70c l o b m y sr e t e m a r a ps n o i t i d n o c t s e tm u m i n i ml a c i p y tm u m i x a ms t i n u v d d e g a t l o v y l p p u s e r o c 5 3 1 . 33 . 35 6 4 . 3v v o d d e g a t l o v y l p p u s t u p t u o 5 3 1 . 33 . 35 6 4 . 3v i d d t n e r r u c y l p p u s r e w o p0 0 = 2 : 1 e l b a n e0 1a m i o d d t n e r r u c y l p p u s t u p t u o0 0 = 2 : 1 e l b a n e5a m t able 4b. p ower s upply dc c haracteristics , v dd = v ddo = 2.5v5%, t a = 0c to 70c l o b m y sr e t e m a r a ps n o i t i d n o c t s e tm u m i n i ml a c i p y tm u m i x a ms t i n u v d d e g a t l o v y l p p u s e r o c 5 7 3 . 25 . 25 2 6 . 2v v o d d e g a t l o v y l p p u s t u p t u o 5 7 3 . 25 . 25 2 6 . 2v i d d t n e r r u c y l p p u s r e w o p0 0 = 2 : 1 e l b a n e8a m i o d d t n e r r u c y l p p u s t u p t u o0 0 = 2 : 1 e l b a n e4a m t able 4c. p ower s upply dc c haracteristics , v dd = v ddo = 1.8v0.2v, t a = 0c to 70c l o b m y sr e t e m a r a ps n o i t i d n o c t s e tm u m i n i ml a c i p y tm u m i x a ms t i n u v d d e g a t l o v y l p p u s e r o c 6 . 18 . 10 . 2v v o d d e g a t l o v y l p p u s t u p t u o 6 . 18 . 10 . 2v i d d t n e r r u c y l p p u s r e w o p0 0 = 2 : 1 e l b a n e5a m i o d d t n e r r u c y l p p u s t u p t u o0 0 = 2 : 1 e l b a n e3a m a bsolute m aximum r atings supply voltage, v dd 4.6v inputs, v i -0.5v to v dd + 0.5 v outputs, v o -0.5v to v ddo + 0.5v package thermal impedance, ja 16 lead soic package 78.8c/w (0 mps) 16 lead tssop package 89c/w (0 lfpm) 20 lead vfqfn package 60.4c/w (0 mps) storage temperature, t stg -65c to 150c note: stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these ratings are stress specifications only. functional op- eration of product at these conditions or any conditions beyond those listed in the dc characteristics or ac characteristics is not implied. exposure to absolute maximum rating conditions for ex- tended periods may affect product reliability. t able 4d. p ower s upply dc c haracteristics , v dd = 3.3v5%, v ddo = 2.5v5%, t a = 0c to 70c l o b m y sr e t e m a r a ps n o i t i d n o c t s e tm u m i n i ml a c i p y tm u m i x a ms t i n u v d d e g a t l o v y l p p u s e r o c 5 3 1 . 33 . 35 6 4 . 3v v o d d e g a t l o v y l p p u s t u p t u o 5 7 3 . 25 . 25 2 6 . 2v i d d t n e r r u c y l p p u s r e w o p0 0 = 2 : 1 e l b a n e0 1a m i o d d t n e r r u c y l p p u s t u p t u o0 0 = 2 : 1 e l b a n e4a m
idt ? / ics ? lvcmos/lvttl fanout buffer 4 ics83905am rev. b july 9, 2007 ics83905 low skew, 1:6 crystal-to-lvcmos/lvttl fanout buffer t able 4g. lvcmos/lvttl dc c haracteristics , t a = 0c to 70c l o b m y sr e t e m a r a ps n o i t i d n o c t s e tm u m i n i ml a c i p y tm u m i x a ms t i n u v h i e g a t l o v h g i h t u p n i , 1 e l b a n e 2 e l b a n e v d d % 5 v 3 . 3 =2v d d 3 . 0 +v v d d % 5 v 5 . 2 =7 . 1v d d 3 . 0 +v v d d v 2 . 0 v 8 . 1 =v * 5 6 . 0 d d v d d 3 . 0 +v v l i e g a t l o v w o l t u p n i , 1 e l b a n e 2 e l b a n e v d d % 5 v 3 . 3 =3 . 0 -8 . 0v v d d % 5 v 5 . 2 =3 . 0 -7 . 0v v d d v 2 . 0 v 8 . 1 =3 . 0 -v * 5 3 . 0 d d v v h o h g i h t u p t u oe g a t l o v v o d d 1 e t o n ; % 5 v 3 . 3 =6 . 2v v o d d i ; % 5 v 5 . 2 = h o a m 1 - =2 v v o d d 1 e t o n ; % 5 v 5 . 2 =8 . 1v v o d d 1 e t o n ; v 2 . 0 v 8 . 1 =v o d d 3 . 0 -v v l o e g a t l o v w o l t u p t u o v o d d 1 e t o n ; % 5 v 3 . 3 =5 . 0v v o d d i ; % 5 v 5 . 2 = l o a m 1 =4 . 0v v o d d 1 e t o n ; % 5 v 5 . 2 =5 4 . 0v v o d d 1 e t o n ; v 2 . 0 v 8 . 1 =5 3 . 0v 0 5 h t i w d e t a n i m r e t s t u p t u o : 1 e t o n v o t o d d . s m a r g a i d " t i u c r i c t s e t d a o l " , n o i t c e s t n e m e r u s a e m r e t e m a r a p e e s . 2 / t able 4e. p ower s upply dc c haracteristics , v dd = 3.3v5%, v ddo = 1.8v0.2v, t a = 0c to 70c l o b m y sr e t e m a r a ps n o i t i d n o c t s e tm u m i n i ml a c i p y tm u m i x a ms t i n u v d d e g a t l o v y l p p u s e r o c 5 3 1 . 33 . 35 6 4 . 3v v o d d e g a t l o v y l p p u s t u p t u o 6 . 18 . 10 . 2v i d d t n e r r u c y l p p u s r e w o p0 0 = 2 : 1 e l b a n e0 1a m i o d d t n e r r u c y l p p u s t u p t u o0 0 = 2 : 1 e l b a n e3a m t able 4f. p ower s upply dc c haracteristics , v dd = 2.5v5%, v ddo = 1.8v0.2v, t a = 0c to 70c l o b m y sr e t e m a r a ps n o i t i d n o c t s e tm u m i n i ml a c i p y tm u m i x a ms t i n u v d d e g a t l o v y l p p u s e r o c 5 7 3 . 25 . 25 2 6 . 2v v o d d e g a t l o v y l p p u s t u p t u o 6 . 18 . 10 . 2v i d d t n e r r u c y l p p u s r e w o p0 0 = 2 : 1 e l b a n e8a m i o d d t n e r r u c y l p p u s t u p t u o0 0 = 2 : 1 e l b a n e3a m t able 5. c rystal c haracteristics r e t e m a r a ps n o i t i d n o c t s e tm u m i n i ml a c i p y tm u m i x a ms t i n u n o i t a l l i c s o f o e d o m l a t n e m a d n u f y c n e u q e r f 0 10 4z h m ) r s e ( e c n a t s i s e r s e i r e s t n e l a v i u q e 0 5 e c n a t i c a p a c t n u h s 7f p l e v e l e v i r d 1w m
idt ? / ics ? lvcmos/lvttl fanout buffer 5 ics83905am rev. b july 9, 2007 ics83905 low skew, 1:6 crystal-to-lvcmos/lvttl fanout buffer t able 6a. ac c haracteristics , v dd = v ddo = 3.3v5%, t a = 0c to 70c t able 6b. ac c haracteristics , v dd = v ddo = 2.5v5%, t a = 0c to 70c l o b m y sr e t e m a r a ps n o i t i d n o c t s e tm u m i n i ml a c i p y tm u m i x a ms t i n u f x a m y c n e u q e r f t u p t u o l a t s y r c l a n r e t x e g n i s u0 10 4z h m k c o l c l a n r e t x e g n i s u ; e c r u o s1 e t o n c d0 0 1z h m c d oe l c y c y t u d t u p t u o 8 42 5% t ) o ( k s4 , 2 e t o n ; w e k s t u p t u o 0 8s p t ) ? ( t i j) m o d n a r ( r e t t i j e s a h p s m r n o i t a r g e t n i ( @ z h m 5 2 ) z h m 1 - z h 0 0 1 : e g n a r 3 1 . 0s p t r /t f e m i t l l a f / e s i r t u p t u o% 0 8 o t % 0 20 0 20 0 8s p t n e ; e m i t e l b a n e t u p t u o 3 e t o n 1 e l b a n e 4s e l c y c 2 e l b a n e 4s e l c y c t s i d ; e m i t e l b a s i d t u p t u o 3 e t o n 1 e l b a n e 4s e l c y c 2 e l b a n e 4s e l c y c ? t a d e r u s a e m s r e t e m a r a p l l a f x a m . e s i w r e h t o d e t o n s s e l n u t u p n i l a t s y r c a g n i s u 0 5 t a d e t a n i m r e t v o t o d d . 2 / . e d i v o r p d l u o w l a t s y r c a l a n g i s a o t e v i t a l e r n e v i r d r e v o e b n a c n i _ l a t x : 1 e t o n v t a d e r u s a e m . s n o i t i d n o c d a o l l a u q e h t i w d n a e g a t l o v y l p p u s e m a s e h t t a s t u p t u o n e e w t e b w e k s s a d e n i f e d : 2 e t o n o d d . 2 / . n o i t c u d o r p n i d e t s e t t o n . n o i t a z i r e t c a r a h c y b d e e t n a r a u g e r a s r e t e m a r a p e s e h t : 3 e t o n . 5 6 d r a d n a t s c e d e j h t i w e c n a d r o c c a n i d e n i f e d s i r e t e m a r a p s i h t : 4 e t o n l o b m y sr e t e m a r a ps n o i t i d n o c t s e tm u m i n i ml a c i p y tm u m i x a ms t i n u f x a m y c n e u q e r f t u p t u o l a t s y r c l a n r e t x e g n i s u0 10 4z h m k c o l c l a n r e t x e g n i s u ; e c r u o s1 e t o n c d0 0 1z h m c d oe l c y c y t u d t u p t u o 7 43 5% t ) o ( k s5 , 2 e t o n ; w e k s t u p t u o 0 8s p t ) ? ( t i j3 e t o n ; ) m o d n a r ( r e t t i j e s a h p s m r n o i t a r g e t n i ( @ z h m 5 2 ) z h m 1 - z h 0 0 1 : e g n a r 6 2 . 0s p t r /t f e m i t l l a f / e s i r t u p t u o% 0 8 o t % 0 20 0 20 0 8s p t n e ; e m i t e l b a n e t u p t u o 4 e t o n 1 e l b a n e 4s e l c y c 2 e l b a n e 4s e l c y c t s i d ; e m i t e l b a s i d t u p t u o 4 e t o n 1 e l b a n e 4s e l c y c 2 e l b a n e 4s e l c y c ? t a d e r u s a e m s r e t e m a r a p l l a f x a m . e s i w r e h t o d e t o n s s e l n u t u p n i l a t s y r c a g n i s u 0 5 t a d e t a n i m r e t v o t o d d . 2 / . e d i v o r p d l u o w l a t s y r c a l a n g i s a o t e v i t a l e r n e v i r d r e v o e b n a c n i _ l a t x : 1 e t o n v t a d e r u s a e m . s n o i t i d n o c d a o l l a u q e h t i w d n a e g a t l o v y l p p u s e m a s e h t t a s t u p t u o n e e w t e b w e k s s a d e n i f e d : 2 e t o n o d d . 2 / . t o l p e s i o n e s a h p o t r e f e r e s a e l p : 3 e t o n . n o i t c u d o r p n i d e t s e t t o n . n o i t a z i r e t c a r a h c y b d e e t n a r a u g e r a s r e t e m a r a p e s e h t : 4 e t o n . 5 6 d r a d n a t s c e d e j h t i w e c n a d r o c c a n i d e n i f e d s i r e t e m a r a p s i h t : 5 e t o n
idt ? / ics ? lvcmos/lvttl fanout buffer 6 ics83905am rev. b july 9, 2007 ics83905 low skew, 1:6 crystal-to-lvcmos/lvttl fanout buffer t able 6d. ac c haracteristics , v dd = 3.3v5%, v ddo = 2.5v5%, t a = 0c to 70c t able 6c. ac c haracteristics , v dd = v ddo = 1.8v0.2v, t a = 0c to 70c l o b m y sr e t e m a r a ps n o i t i d n o c t s e tm u m i n i ml a c i p y tm u m i x a ms t i n u f x a m y c n e u q e r f t u p t u o l a t s y r c l a n r e t x e g n i s u0 10 4z h m k c o l c l a n r e t x e g n i s u ; e c r u o s1 e t o n c d0 0 1z h m c d oe l c y c y t u d t u p t u o 7 43 5% t ) o ( k s4 , 2 e t o n ; w e k s t u p t u o 0 8s p t ) ? ( t i j) m o d n a r ( r e t t i j e s a h p s m r n o i t a r g e t n i ( @ z h m 5 2 ) z h m 1 - z h 0 0 1 : e g n a r 7 2 . 0s p t r /t f e m i t l l a f / e s i r t u p t u o% 0 8 o t % 0 20 0 20 0 9s p t n e ; e m i t e l b a n e t u p t u o 3 e t o n 1 e l b a n e 4s e l c y c 2 e l b a n e 4s e l c y c t s i d ; e m i t e l b a s i d t u p t u o 3 e t o n 1 e l b a n e 4s e l c y c 2 e l b a n e 4s e l c y c ? t a d e r u s a e m s r e t e m a r a p l l a f x a m . e s i w r e h t o d e t o n s s e l n u t u p n i l a t s y r c a g n i s u 0 5 t a d e t a n i m r e t v o t o d d . 2 / . e d i v o r p d l u o w l a t s y r c a l a n g i s a o t e v i t a l e r n e v i r d r e v o e b n a c n i _ l a t x : 1 e t o n v t a d e r u s a e m . s n o i t i d n o c d a o l l a u q e h t i w d n a e g a t l o v y l p p u s e m a s e h t t a s t u p t u o n e e w t e b w e k s s a d e n i f e d : 2 e t o n o d d . 2 / . n o i t c u d o r p n i d e t s e t t o n . n o i t a z i r e t c a r a h c y b d e e t n a r a u g e r a s r e t e m a r a p e s e h t : 3 e t o n . 5 6 d r a d n a t s c e d e j h t i w e c n a d r o c c a n i d e n i f e d s i r e t e m a r a p s i h t : 4 e t o n l o b m y sr e t e m a r a ps n o i t i d n o c t s e tm u m i n i ml a c i p y tm u m i x a ms t i n u f x a m y c n e u q e r f t u p t u o l a t s y r c l a n r e t x e g n i s u0 10 4z h m k c o l c l a n r e t x e g n i s u ; e c r u o s1 e t o n c d0 0 1z h m c d oe l c y c y t u d t u p t u o 8 42 5% t ) o ( k s4 , 2 e t o n ; w e k s t u p t u o 0 8s p t ) ? ( t i j) m o d n a r ( r e t t i j e s a h p s m r n o i t a r g e t n i ( @ z h m 5 2 ) z h m 1 - z h 0 0 1 : e g n a r 4 1 . 0s p t r /t f e m i t l l a f / e s i r t u p t u o% 0 8 o t % 0 20 0 20 0 8s p t n e ; e m i t e l b a n e t u p t u o 3 e t o n 1 e l b a n e 4s e l c y c 2 e l b a n e 4s e l c y c t s i d ; e m i t e l b a s i d t u p t u o 3 e t o n 1 e l b a n e 4s e l c y c 2 e l b a n e 4s e l c y c ? t a d e r u s a e m s r e t e m a r a p l l a f x a m . e s i w r e h t o d e t o n s s e l n u t u p n i l a t s y r c a g n i s u 0 5 t a d e t a n i m r e t v o t o d d . 2 / . e d i v o r p d l u o w l a t s y r c a l a n g i s a o t e v i t a l e r n e v i r d r e v o e b n a c n i _ l a t x : 1 e t o n v t a d e r u s a e m . s n o i t i d n o c d a o l l a u q e h t i w d n a e g a t l o v y l p p u s e m a s e h t t a s t u p t u o n e e w t e b w e k s s a d e n i f e d : 2 e t o n o d d . 2 / . n o i t c u d o r p n i d e t s e t t o n . n o i t a z i r e t c a r a h c y b d e e t n a r a u g e r a s r e t e m a r a p e s e h t : 3 e t o n . 5 6 d r a d n a t s c e d e j h t i w e c n a d r o c c a n i d e n i f e d s i r e t e m a r a p s i h t : 4 e t o n
idt ? / ics ? lvcmos/lvttl fanout buffer 7 ics83905am rev. b july 9, 2007 ics83905 low skew, 1:6 crystal-to-lvcmos/lvttl fanout buffer t able 6e. ac c haracteristics , v dd = 3.3v5%, v ddo = 1.8v0.2v, t a = 0c to 70c t able 6f. ac c haracteristics , v dd = 2.5v5%, v ddo = 1.8v0.2v, t a = 0c to 70c l o b m y sr e t e m a r a ps n o i t i d n o c t s e tm u m i n i ml a c i p y tm u m i x a ms t i n u f x a m y c n e u q e r f t u p t u o l a t s y r c l a n r e t x e g n i s u0 10 4z h m k c o l c l a n r e t x e g n i s u ; e c r u o s1 e t o n c d0 0 1z h m c d oe l c y c y t u d t u p t u o 8 42 5% t ) o ( k s4 , 2 e t o n ; w e k s t u p t u o 0 8s p t ) ? ( t i j) m o d n a r ( r e t t i j e s a h p s m r n o i t a r g e t n i ( @ z h m 5 2 ) z h m 1 - z h 0 0 1 : e g n a r 8 1 . 0s p t r /t f e m i t l l a f / e s i r t u p t u o% 0 8 o t % 0 20 0 20 0 9s p t n e ; e m i t e l b a n e t u p t u o 3 e t o n 1 e l b a n e 4s e l c y c 2 e l b a n e 4s e l c y c t s i d ; e m i t e l b a s i d t u p t u o 3 e t o n 1 e l b a n e 4s e l c y c 2 e l b a n e 4s e l c y c ? t a d e r u s a e m s r e t e m a r a p l l a f x a m . e s i w r e h t o d e t o n s s e l n u t u p n i l a t s y r c a g n i s u 0 5 t a d e t a n i m r e t v o t o d d . 2 / . e d i v o r p d l u o w l a t s y r c a l a n g i s a o t e v i t a l e r n e v i r d r e v o e b n a c n i _ l a t x : 1 e t o n v t a d e r u s a e m . s n o i t i d n o c d a o l l a u q e h t i w d n a e g a t l o v y l p p u s e m a s e h t t a s t u p t u o n e e w t e b w e k s s a d e n i f e d : 2 e t o n o d d . 2 / . n o i t c u d o r p n i d e t s e t t o n . n o i t a z i r e t c a r a h c y b d e e t n a r a u g e r a s r e t e m a r a p e s e h t : 3 e t o n . 5 6 d r a d n a t s c e d e j h t i w e c n a d r o c c a n i d e n i f e d s i r e t e m a r a p s i h t : 4 e t o n l o b m y sr e t e m a r a ps n o i t i d n o c t s e tm u m i n i ml a c i p y tm u m i x a ms t i n u f x a m y c n e u q e r f t u p t u o l a t s y r c l a n r e t x e g n i s u0 10 4z h m k c o l c l a n r e t x e g n i s u ; e c r u o s1 e t o n c d0 0 1z h m c d oe l c y c y t u d t u p t u o 7 43 5% t ) o ( k s4 , 2 e t o n ; w e k s t u p t u o 0 8s p t ) ? ( t i j) m o d n a r ( r e t t i j e s a h p s m r n o i t a r g e t n i ( @ z h m 5 2 ) z h m 1 - z h 0 0 1 : e g n a r 9 1 . 0s p t r /t f e m i t l l a f / e s i r t u p t u o% 0 8 o t % 0 20 0 20 0 9s p t n e ; e m i t e l b a n e t u p t u o 3 e t o n 1 e l b a n e 4s e l c y c 2 e l b a n e 4s e l c y c t s i d ; e m i t e l b a s i d t u p t u o 3 e t o n 1 e l b a n e 4s e l c y c 2 e l b a n e 4s e l c y c ? t a d e r u s a e m s r e t e m a r a p l l a f x a m . e s i w r e h t o d e t o n s s e l n u t u p n i l a t s y r c a g n i s u 0 5 t a d e t a n i m r e t v o t o d d . 2 / . e d i v o r p d l u o w l a t s y r c a l a n g i s a o t e v i t a l e r n e v i r d r e v o e b n a c n i _ l a t x : 1 e t o n v t a d e r u s a e m . s n o i t i d n o c d a o l l a u q e h t i w d n a e g a t l o v y l p p u s e m a s e h t t a s t u p t u o n e e w t e b w e k s s a d e n i f e d : 2 e t o n o d d . 2 / . n o i t c u d o r p n i d e t s e t t o n . n o i t a z i r e t c a r a h c y b d e e t n a r a u g e r a s r e t e m a r a p e s e h t : 3 e t o n . 5 6 d r a d n a t s c e d e j h t i w e c n a d r o c c a n i d e n i f e d s i r e t e m a r a p s i h t : 4 e t o n
idt ? / ics ? lvcmos/lvttl fanout buffer 8 ics83905am rev. b july 9, 2007 ics83905 low skew, 1:6 crystal-to-lvcmos/lvttl fanout buffer t ypical p hase n oise at 25mh z (2.5v c ore / 2.5v o utput ) 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 -150 -160 -170 -180 -190 10 100 1k 10k 100k 1m 25mhz rms phase jitter (random) 100hz to 1mhz = 0.26ps (typical) o ffset f requency (h z ) n oise p ower dbc hz raw phase noise data ? t ypical p hase n oise at 25mh z (3.3v c ore / 3.3v o utput ) 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 -140 -150 -160 -170 -180 -190 10 100 1k 10k 100k 1m 25mhz rms phase jitter (random) 100hz to 1mhz = 0.13ps (typical) o ffset f requency (h z ) n oise p ower dbc hz raw phase noise data ?
idt ? / ics ? lvcmos/lvttl fanout buffer 9 ics83905am rev. b july 9, 2007 ics83905 low skew, 1:6 crystal-to-lvcmos/lvttl fanout buffer p arameter m easurement i nformation scope qx lvcmos gnd 1.8v c ore /1.8v o utput l oad ac t est c ircuit 2.40.9v v ddo -0.9v0.1v v dd 0.9v0.1v scope qx lvcmos gnd 2.5v c ore /2.5v o utput l oad ac t est c ircuit 2.05v5% v ddo -1.25v5% v dd 1.25v5% 3.3v core /3.3v o utput l oad ac t est c ircuit scope qx lvcmos gnd 1.65v5% -1.65v5% 3.3v c ore /2.5v o utput l oad ac t est c ircuit 3.3v c ore /1.8v o utput l oad ac t est c ircuit 2.5 c ore /1.8v o utput l oad ac t est c ircuit scope qx lvcmos gnd 1.25v5% -1.25v5% scope qx lvcmos gnd 0.9v0.1v -0.9v 0.1v scope qx lvcmos gnd 1.6v0.025% v ddo -0.9v0.1v v dd 0.9v0.1v v dd , v ddo v dd , v ddo v dd , v ddo
idt ? / ics ? lvcmos/lvttl fanout buffer 10 ics83905am rev. b july 9, 2007 ics83905 low skew, 1:6 crystal-to-lvcmos/lvttl fanout buffer clock outputs 20% 80% 80% 20% t r t f t period t pw t period odc = v dd 2 x 100% t pw bclkx o utput r ise /f all t ime o utput d uty c ycle /p ulse w idth /p eriod o utput s kew t sk(o) v ddo 2 v ddo 2 qy qx
idt ? / ics ? lvcmos/lvttl fanout buffer 11 ics83905am rev. b july 9, 2007 ics83905 low skew, 1:6 crystal-to-lvcmos/lvttl fanout buffer a pplication i nformation c rystal i nput i nterface figure 2 shows an example of ics83905 crystal interface with a parallel resonant crystal. the frequency accuracy can be fine tuned by adjusting the c1 and c2 values. for a parallel crystal with loading capacitance cl = 18pf, we suggest c1 = 15pf and c2 = 15pf to start with. these values may be slightly fine tuned further to optimize the frequency accuracy for different board layouts. slightly increasing the c1 and c2 values will slightly reduce the frequency. slightly decreasing the c1 and c2 values will slightly increase the frequency. for the oscillator circuit below, r1 can be used, but is not required. for new designs, it is recommended that r1 not be used. f igure 2. c rystal o scillator i nterface c1 15p r1 (optional) 0 x1 18pf parallel cry stal c2 15p xtal_in xtal_out lvcmos to xtal i nterface the xtal_in input can accept a single-ended lvcmos signal through an ac couple capacitor. a general interface diagram is shown in figure 3. the xtal_out pin can be left floating. the input edge rate can be as slow as 10ns. for lvcmos inputs, it is recommended that the amplitude be reduced from full swing to half swing in order to prevent signal interference with the power rail and to reduce noise. this configuration requires that the output impedance of the driver (ro) plus the series resistance (rs) equals the transmission line impedance. in addition, matched termination at the crystal input will attenuate the signal in half. this can be done in one of two ways. first, r1 and r2 in parallel should equal the transmission line impedance. for most 50 applications, r1 and r2 can be 100 . this can also be accomplished by removing r1 and making r2 50 . f igure 3. g eneral d iagram for lvcmos d river to xtal i nput i nterface xta l _ i n xta l _ o u t vcc r2 ro r1 zo = 50 rs vcc .1uf v dd v dd zo = ro + rs
idt ? / ics ? lvcmos/lvttl fanout buffer 12 ics83905am rev. b july 9, 2007 ics83905 low skew, 1:6 crystal-to-lvcmos/lvttl fanout buffer i nputs : lvcmos c ontrol p ins all control pins have internal pull-ups or pull-downs; additional resistance is not required but can be added for additional protection. a 1k resistor can be used. r ecommendations for u nused i nput and o utput p ins o utputs : lvcmos o utputs all unused lvcmos output can be left floating. there should be no trace attached. exposed pad expose metal pad (ground pad) ground plane solder signal trace signal trace therm al via solder m ask f igure 4. p.c. b oard for e xposed p ad t hermal r elease p ath e xample t hermal r elease p ath the expose metal pad provides heat transfer from the device to the p.c. board. the expose metal pad is ground pad connected to ground plane through thermal via. the exposed pad on the device to the exposed metal pad on the pcb is contacted through solder as shown in figure 4. for further information, please refer to the application note on surface mount assembly of amkor?s thermally /electrically enhance leadframe base package, amkor technology.
idt ? / ics ? lvcmos/lvttl fanout buffer 13 ics83905am rev. b july 9, 2007 ics83905 low skew, 1:6 crystal-to-lvcmos/lvttl fanout buffer l ayout g uideline figure 5 shows an example of ics83905 application schematic. in this example, the device is operated at v dd = 3.3v and v ddo = 3.3v. the decoupling capacitors should be located as close as possible to the power pins. the input is driven by an 18pf load resonant quartz crystal. the tuning capacitors (c1, c2) are fairly vdd r2 31 c6 .1uf vddo enable 2 r4 100 zo = 50 ohm vdd = 3.3v c2 15pf vdd c1 15pf lvcmos enable 1 cl = 18 pf optional termination r3 100 c4 .1uf lvcmos zo = 50 ohm vddo u1 ics83905 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 xta l _ o u t enable 2 gnd bclk0 vddo bclk1 gnd bclk2 vdd bclk3 gnd bclk4 vddo bclk5 enable 1 xta l _ i n c3 10uf vddo = 3.3v unused outputs can be left floating. there should be no trace attached to unused outputs. device characterized and specification limits set with all outputs terminated. c5 .1uf accurate, but minor adjustments might be required. for the lvcmos output drivers, two termination examples are shown in the schematic. for additional termination, examples are shown in the lvcmos termination application note. f igure 5. s chematic of r ecommended l ayout
idt ? / ics ? lvcmos/lvttl fanout buffer 14 ics83905am rev. b july 9, 2007 ics83905 low skew, 1:6 crystal-to-lvcmos/lvttl fanout buffer r eliability i nformation t ransistor c ount the transistor count for ics83905 is: 339 pin compatible to mpc905 t able 7b. ja vs . a ir f low t able for 16 l ead tssop ja by velocity (linear feet per minute) 0 200 500 single-layer pcb, jedec standard test boards 137.1c/w 118.2c/w 106.8c/w multi-layer pcb, jedec standard test boards 89.0c/w 81.8c/w 78.1c/w note: most modern pcb designs use multi-layered boards. the data in the second row pertains to most designs. t able 7a. ja vs . a ir f low t able for 16 l ead soic ja by velocity (meters per second) 012 multi-layer pcb, jedec standard test boards 78.8c/w 71.1c/w 66.2c/w t able 7c. ja vs . a ir f low t able for 20 l ead vfqfn ja by velocity (meters per second) 013 multi-layer pcb, jedec standard test boards 60.4c/w 52.8c/w 46.0c/w
idt ? / ics ? lvcmos/lvttl fanout buffer 15 ics83905am rev. b july 9, 2007 ics83905 low skew, 1:6 crystal-to-lvcmos/lvttl fanout buffer p ackage o utline - g s uffix for 16 l ead tssop l o b m y s s r e t e m i l l i m m u m i n i mm u m i x a m n6 1 a- -0 2 . 1 1 a5 0 . 05 1 . 0 2 a0 8 . 05 0 . 1 b9 1 . 00 3 . 0 c9 0 . 00 2 . 0 d0 9 . 40 1 . 5 ec i s a b 0 4 . 6 1 e0 3 . 40 5 . 4 ec i s a b 5 6 . 0 l5 4 . 05 7 . 0 0 8 a a a- -0 1 . 0 p ackage o utline - m s uffix for 16 l ead soic t able 8a. p ackage d imensions for 16 l ead soic reference document: jedec publication 95, ms-012 l o b m y s s r e t e m i l l i m m u m i n i mm u m i x a m n6 1 a5 3 . 15 7 . 1 1 a0 1 . 05 2 . 0 b3 3 . 01 5 . 0 c9 1 . 05 2 . 0 d0 8 . 90 0 . 0 1 e0 8 . 30 0 . 4 ec i s a b 7 2 . 1 h0 8 . 50 2 . 6 h5 2 . 00 5 . 0 l0 4 . 07 2 . 1 0 8 t able 8b. p ackage d imensions for tssop
idt ? / ics ? lvcmos/lvttl fanout buffer 16 ics83905am rev. b july 9, 2007 ics83905 low skew, 1:6 crystal-to-lvcmos/lvttl fanout buffer t able 8c. p ackage d imensions for 20 l ead vfqfn p ackage o utline - k s uffix for 20 l ead vfqfn n o i t a i r a v c e d e j s r e t e m i l l i m n i s n o i s n e m i d l l a l o b m y sm u m i n i mm u m i x a m n 0 2 a 0 8 . 00 . 1 1 a 05 0 . 0 3 a e c n e r e f e r 5 2 . 0 b 8 1 . 00 3 . 0 e c i s a b 0 5 . 0 n d 5 n e 5 d 0 . 4 2 d 5 7 . 00 8 . 2 e 0 . 4 2 e 5 7 . 00 8 . 2 l 5 3 . 05 7 . 0 reference document: jedec publication 95, mo-220
idt ? / ics ? lvcmos/lvttl fanout buffer 17 ics83905am rev. b july 9, 2007 ics83905 low skew, 1:6 crystal-to-lvcmos/lvttl fanout buffer while the information presented herein has been checked for both accuracy and reliability, integrated device technology, incorp orated (idt) assumes no responsibility for either its use or for infringement of any patents or other rights of third parties, which would result from its use. no other circuits, patents, or l icenses are implied. this product is intended for use in normal commercial applications. any other applications such as those requiring high reliability or other extraordinary environmental requirements are not recommended without additional processing by idt. idt reserves the right to change any circuitry or specifications without notice. idt does not authorize or warrant any idt product for use i n life support devices or critical medical instruments. t able 9. o rdering i nformation r e b m u n r e d r o / t r a pg n i k r a me g a k c a pg n i g a k c a p g n i p p i h se r u t a r e p m e t m a 5 0 9 3 8 s c im a 5 0 9 3 8c i o s d a e l 6 1e b u tc 0 7 o t c 0 t m a 5 0 9 3 8 s c im a 5 0 9 3 8c i o s d a e l 6 1l e e r & e p a t 0 0 5 2c 0 7 o t c 0 f l m a 5 0 9 3 8 s c il m a 5 0 9 3 8c i o s " e e r f - d a e l " d a e l 6 1e b u tc 0 7 o t c 0 t f l m a 5 0 9 3 8 s c il m a 5 0 9 3 8c i o s " e e r f - d a e l " d a e l 6 1l e e r & e p a t 0 0 5 2c 0 7 o t c 0 g a 5 0 9 3 8 s c ig a 5 0 9 3 8p o s s t d a e l 6 1e b u tc 0 7 o t c 0 t g a 5 0 9 3 8 s c ig a 5 0 9 3 8p o s s t d a e l 6 1l e e r & e p a t 0 0 5 2c 0 7 o t c 0 f l g a 5 0 9 3 8 s c il g a 5 0 9 3 8p o s s t " e e r f - d a e l " d a e l 6 1e b u tc 0 7 o t c 0 t f l g a 5 0 9 3 8 s c il g a 5 0 9 3 8p o s s t " e e r f - d a e l " d a e l 6 1l e e r & e p a t 0 0 5 2c 0 7 o t c 0 k a 5 0 9 3 8 s c ia 5 0 9 3 8n f q f v d a e l 0 2e b u tc 0 7 o t c 0 t k a 5 0 9 3 8 s c ia 5 0 9 3 8n f q f v d a e l 0 2l e e r & e p a t 0 0 5 2c 0 7 o t c 0 f l k a 5 0 9 3 8 s c il a 5 0 9 3n f q f v " e e r f - d a e l " d a e l 0 2e b u tc 0 7 o t c 0 t f l k a 5 0 9 3 8 s c il a 5 0 9 3n f q f v " e e r f - d a e l " d a e l 0 2l e e r & e p a t 0 0 5 2c 0 7 o t c 0 note: parts that are ordered with an ?lf? suffix to the part number are the pb-free configuration and are rohs compliant.
idt ? / ics ? lvcmos/lvttl fanout buffer 18 ics83905am rev. b july 9, 2007 ics83905 low skew, 1:6 crystal-to-lvcmos/lvttl fanout buffer t e e h s y r o t s i h n o i s i v e r v e re l b a te g a pe g n a h c f o n o i t p i r c s e de t a d a2 . m a r g a i d g n i m i t e l b a n e d e d d a 5 0 / 8 2 / 3 bf 6 - a 6 1 7 - 5 8 . t e l l u b r e t t i j e s a h p s m r d e d d a - n o i t c e s s e r u t a e f . c e p s r e t t i j e s a h p s m r d e d d a - s e l b a t s c i t s i r e t c a r a h c c a . t o l p e s i o n e s a h p d e d d a 5 0 / 8 / 4 b 9 t4 1. r e b m u n t r a p f l - n o n , p o s s t d d a - e l b a t n o i t a m r o f n i g n i r e d r o 5 0 / 5 2 / 4 b 1 1 2 1 . n o i t c e s n o i t a c i l p p a n i e c a f r e t n i t u p n i l a t s y r c d e d d a . t u o y a l c i t a m e h c s d e d d a 5 0 / 6 1 / 5 b c 7 t 3 1 1 3 1 l a m r e h t e g a k c a p n f q f v d a e l 0 2 t c e r r o c - s g n i t a r m u m i x a m e t u l o s b a . e c n a d e p m i d e d d a . s n i p t u p t u o d n a t u p n i d e s u n u r o f s n o i t a d n e m m o c e r . n f q f v d a e l 0 2 r o f e l b a t w o l f r i a a j a t e h t d e t c e r r o c 6 0 / 2 / 0 1 b 9 t 1 1 2 1 7 1 d e d d a n o i t c e s e c a f r e t n i l a t x o t s o m c v l . d e d d a n o i t c e s h t a p e s a e l e r l a m r e h t . . e g a k c a p n f q f v 0 2 r o f g n i k r a m e e r f - d a e l d e d d a - e l b a t s c i t s i r e t c a r a h c c a 7 0 / 9 / 7
innovate with idt and accelerate your future networks. contact: www.idt.com for sales 800-345-7015 408-284-8200 fax: 408-284-2775 for tech support netcom@idt.com 480-763-2056 corporate headquarters integrated device t echnology, inc. 6024 silver creek valley road san jose, ca 95138 united states 800 345 7015 +408 284 8200 (outside u.s.) asia pacific and japan integrated device technology singapore (1997) pte. ltd. reg. no. 199707558g 435 orchard road #20-03 wisma atria singapore 238877 +65 6 887 5505 europe idt europe, limited 321 kingston road leatherhead, surrey kt22 7tu england +44 (0) 1372 363 339 fax: +44 (0) 1372 378851 ? 2007 integrated device technology, inc. all rights reserved. product specifications subject to change without notice. idt, th e idt logo, ics and hiperclocks are trademarks of integrated device technology, inc. accelerated thinking is a service mark of integrated device technology, inc. all other br ands, product names and marks are or may be trademarks or registered trademarks used to identify products or services of their respective owners. printed in usa ics83905 low skew, 1:6 crystal-to-lvcmos/lvttl fanout buffer

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