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low skew, 1-to-6, crystal oscillator/lvcmos- to-3.3v, 2.5v lvpecl/lvcmos fanout buffer ICS8536I-33 idt ? / ics ? 3.3v lvpecl/ lvcmos fanout buffer 1 i cs8536cgi-33 rev. b october 27, 2008 g eneral d escription the ICS8536I-33 is a low skew, high performance 1-to-6 crystal oscillator/lvcmos-to-3.3v, 2.5v lvpecl/lvcmos fanout buffer and a member of the hiperclocks? family of high performance clock solutions from idt. the ICS8536I-33 has selectable single ended clock or crystal inputs. the single-ended clock input accepts lvcmos or lvttl input levels and translate them to 3.3v lvpecl levels. the output enable is internally synchronized to eliminate runt pulses on the outputs during asynchronous assertion/deassertion of the clock enable pin. guaranteed output and part-to-part skew characteristics make the ICS8536I-33 ideal for those applications demanding well defined performance and repeatability. f eatures ? three differential lvpecl outputs, and three single ended lvcmos outputs ? selectable lvcmos/lvttl clk or crystal inputs ? clk can accept the following input levels: lvcmos, lvttl ? crystal frequency: 25mhz ? maximum output frequency: 266mhz ? output skew: 80ps (maximum) ? part-to-part skew: 800ps (maximum) ? propagation delay: 1.95ns (maximum) ? additive phase jitter, rms: 0.32ps (typical), lvpecl output ? full 3.3v or 2.5v operating supply ? -40c to 85c ambient operating temperature ? available in both standard (rohs 5) and lead-free (rohs 6) packages b lock d iagram p in a ssignment hiperclocks? ic s 1 0 osc d le q0 nq0 q1 nq1 q2 nq2 q3 q4 q5 lvpecl lvcmos pullup pulldown pullup 25mhz clk_en clk_sel clk xtal_in xtal_out ICS8536I-33 20-lead tssop 6.5mm x 4.4mm x 0.925mm package body g package top view clk_en xtal_in xtal_out v cc clk clk_sel v ee q0 nq0 v cco _ lvpecl 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 v ee q5 q4 v cco _ lvcmos q3 v ee q2 nq2 nq1 q1
idt ? / ics ? 3.3v, 2.5v lvpecl/ lvcmos fanout buffer 2 ics8536cgi-33 rev. b october 27, 2008 ICS8536I-33 low skew, 1-to-6, crystal oscillator/lvcmos-to-3.3v, 2.5v lvpecl/lvcmos fanout buffer t able 2. p in c haracteristics t able 1. p in d escriptions r e b m u ne m a ne p y tn o i t p i r c s e d 1n e _ k l ct u p n ip u l l u p k c o l c s w o l l o f s t u p t u o k c o l c , h g i h n e h w . e l b a n e k c o l c g n i z i n o r h c n y s . h g i h d e c r o f s i t u p t u o 0 q n , w o l d e c r o f e r a s t u p t u o q , w o l n e h w . t u p n i . 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 , 2 3 , n i _ l a t x t u o _ l a t x t 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 . t u p t u o e h t s i t u o _ l a t x 4v c c r e w o p. s n i p y l p p u s e v i t i s o p 5k l ct u p n in w o d l l u p. 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 . t u p n i k c o l c d e d n e - e l g n i s 6l e s _ k l ct u p n ip u l l u p . s t u p n i l a t x s t c e l e s , h g i h n e h w . t u p n i t c e l e s k c o l c . 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 . t u p n i k l c s t c e l e s , w o l n e h w , 5 1 , 7 0 2 v e e r e w o p. n i p y l p p u s e v i t a g e n 9 , 80 q n , 0 qt u p t u o. s l e v e l e c a f r e t n i l c e p v l . s t u p t u o k c o l c l a i t n e r e f f i d 0 1v l c e p v l _ o c c r e w o p . s t u p t u o k c o l c l c e p v l r o f e d o m y l p p u s r e w o p t u p t u o 2 1 , 1 11 q n , 1 qt u p t u o. s l e v e l e c a f r e t n i l c e p v l . s t u p t u o k c o l c l a i t n e r e f f i d 4 1 , 3 12 q , 2 q nt u p t u o. s l e v e l e c a f r e t n i l c e p v l . s t u p t u o k c o l c l a i t n e r e f f i d 9 1 , 8 1 , 6 15 q , 4 q , 3 qt 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 e d n e e l g n i s 7 1v s o m c v l _ o c c r e w o p . s t u p t u o k c o l c l t t v l / s o m c v l r o f e d o m y l p p u s r e w o p t u p t u o : e t o n p u l l u p d n a n w o d l l u p . s e u l a v l a c i p y t r o f , s c i t s i r e t c a r a h c n i p , 2 e l b a t e e s . s r o t s i s e r t u p n i l a n r e t n i o t r e f e r 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 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 ( e c n a t i c a p a c 5 q : 3 q v , c c v s o m c v l _ o c c v 5 6 4 . 3 =8f p v , c c v s o m c v l _ o c c v 5 2 6 . 2 =5f p r p u l l u p r o t s i s e r p u l l u p t u p n i 1 5k r n w o d l l u p r o t s i s e r n w o d l l u p t u p n i 1 5k r t u o e c n a d e p m i t u p t u o 5 q : 3 qv , c c v s o m c v l _ o c c v 5 6 4 . 3 =5 1 5 q : 3 qv , c c v s o m c v l _ o c c v 5 2 6 . 2 =0 2
idt ? / ics ? 3.3v, 2.5v lvpecl/ lvcmos fanout buffer 3 ics8536cgi-33 rev. b october 27, 2008 ICS8536I-33 low skew, 1-to-6, crystal oscillator/lvcmos-to-3.3v, 2.5v lvpecl/lvcmos fanout buffer t able 3a. c ontrol i nput f unction t able t able 3b. c lock i nput f unction t able enabled disabled clk clk_en nq0:nq2 q0:q5 f igure 1. clk_en t iming d iagram s t u p n is t u p t u o n e _ k l cl e s _ k l ce c r u o s d e t c e l e s2 q : 0 q2 q n : 0 q n5 q : 3 q 00 k l cw o l ; d e l b a s i dh g i h ; d e l b a s i dw o l ; d e l b a s i d 01 t u o _ l a t x , n i _ l a t xw o l ; d e l b a s i dh g i h ; d e l b a s i dw o l ; d e l b a s i d 10 k l cd e l b a n ed e l b a n ed e l b a n e 11 t u o _ l a t x , n i _ l a t xd e l b a n ed e l b a n ed e l b a n e r o k c o l c t u p n i g n i l l a f d n a g n i s i r a g n i w o l l o f d e l b a n e r o d e l b a s i d e r a s t u p t u o k c o l c e h t , s e h c t i w s n e _ k l c r e t f a n i n w o h s s a e g d e r o t a l l i c s o l a t s y r c e r u g i f . 1 . b 3 e l b a t n i d e b i r c s e d s a t u p n i k l c e h t f o n o i t c n u f a e r a s t u p t u o e h t f o e t a t s e h t , e d o m e v i t c a e h t n i s t u p n is t u p t u o k l c2 q : 0 q2 q n : 0 q n5 q : 3 q 0w o lh g i hw o l 1h g i hw o lh g i h
idt ? / ics ? 3.3v, 2.5v lvpecl/ lvcmos fanout buffer 4 ics8536cgi-33 rev. b october 27, 2008 ICS8536I-33 low skew, 1-to-6, crystal oscillator/lvcmos-to-3.3v, 2.5v lvpecl/lvcmos fanout buffer a bsolute m aximum r atings supply voltage, v cc 4.6v inputs, v i (lvcmos) -0.5v to v cc + 0.5 v outputs, v o (lvcmos) -0.5v to v cco_lvcmos + 0.5v inputs, v i (lvpecl) -0.5v to v cc + 0.5v outputs, i o (lvpecl) contin uous current 50ma surge current 100ma package thermal impedance, ja 91.1c/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 4a. p ower s upply dc c haracteristics , v cc = v cco_lvpecl = v cco_lvcmos = 3.3v5%, v ee = 0v, t a = -40c to 85c 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 c c e g a t l o v y l p p u s r e w o p 5 3 1 . 33 . 35 6 4 . 3v v , l c e p v l _ o c c v s o m c v l _ o c c e g a t l o v y l p p u s r e w o p 5 3 1 . 33 . 35 6 4 . 3v i e e t n e r r u c y l p p u s r e w o p 0 8a m i l c e p v l _ o c c t n e r r u c y l p p u s r e w o p 5 2a m i s o m c v l _ o c c t n e r r u c y l p p u s r e w o p 5 4a m t able 4b. p ower s upply dc c haracteristics , v cc = v cco_lvpecl = v cco_lvcmos = 2.5v5%, v ee = 0v, t a = -40c to 85c 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 c c e g a t l o v y l p p u s r e w o p 5 7 3 . 25 . 25 2 6 . 2v v , l c e p v l _ o c c v s o m c v l _ o c c e g a t l o v y l p p u s r e w o p 5 7 3 . 25 . 25 2 6 . 2v i e e t n e r r u c y l p p u s r e w o p 0 8a m i l c e p v l _ o c c t n e r r u c y l p p u s r e w o p 0 3a m i s o m c v l _ o c c t n e r r u c y l p p u s r e w o p 5 4a m
idt ? / ics ? 3.3v, 2.5v lvpecl/ lvcmos fanout buffer 5 ics8536cgi-33 rev. b october 27, 2008 ICS8536I-33 low skew, 1-to-6, crystal oscillator/lvcmos-to-3.3v, 2.5v lvpecl/lvcmos fanout buffer t able 4c. lvcmos / lvttl dc c haracteristics , t a = -40c to 85c t able 4d. lvpecl dc c haracteristics , v cc = v cco_lvpecl = 3.3v5%, v ee = 0v, t a = -40c to 85c 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 2 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 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 v c c v 3 . 3 =2v c c 3 . 0 +v v c c v 5 . 2 =7 . 1v c c 3 . 0 +v v l i e g a t l o v w o l t u p n i v c c v 3 . 3 =3 . 0 -8 . 0v v c c v 5 . 2 =3 . 0 -7 . 0v v s y h t u p n i s i s e r e t s y h , n e _ k l c l e s _ k l c 0 0 1v m i h i t u p n i t n e r r u c h g i h k l cv c c v = n i v 5 2 6 . 2 r o v 5 6 4 . 3 =0 5 1a , n e _ k l c l e s _ k l c v c c v = n i v 5 2 6 . 2 r o v 5 6 4 . 3 =5a i l i t u p n i t n e r r u c w o l k l cv c c v , v 5 2 6 . 2 r o v 5 6 4 . 3 = n i v 0 =5 -a , n e _ k l c l e s _ k l c v c c v , v 5 2 6 . 2 r o v 5 6 4 . 3 = n i v 0 =0 5 1 -a v h o 1 e t o n ; e g a t l o v h g i h t u p t u o v s o m c v l _ o c c v 5 6 4 . 3 =6 . 2v v s o m c v l _ o c c v 5 2 6 . 2 =8 . 1v v l o 1 e t o n ; e g a t l o v w o l t u p t u ov s o m c v l _ o c c v 5 2 6 . 2 r o 5 6 4 . 3 =5 . 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 s o m c v l _ o c c t u p t u o s o m c v l " . n o i t c e s n o i t a m r o f n i t n e m e r u s a e m r e t e m a r a p e e s . 2 / . s m a r g a i d " t i u c r i c t s e t d a o l 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 o 1 e t o n ; e g a t l o v h g i h t u p t u ov l c e p v l _ o c c 4 . 1 -v l c e p v l _ o c c 9 . 0 -v v l o 1 e t o n ; e g a t l o v w o l t u p t u ov l c e p v l _ o c c -0 . 2v l c e p v l _ o c c -7 . 1v v g n i w s g n i w s e g a t l o v t u p t u o k a e p - o t - k a e p6 . 00 . 1v 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 l c e p v l _ o c c . v 2 - t able 4e. lvpecl dc c haracteristics , v cc = v cco_lvpecl = 2.5v5%, v ee = 0v, t a = -40c to 85c 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 o 1 e t o n ; e g a t l o v h g i h t u p t u ov l c e p v l _ o c c 4 . 1 -v l c e p v l _ o c c 9 . 0 -v v l o 1 e t o n ; e g a t l o v w o l t u p t u ov l c e p v l _ o c c -0 . 2v l c e p v l _ o c c -5 . 1v v g n i w s g n i w s e g a t l o v t u p t u o k a e p - o t - k a e p4 . 00 . 1v 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 l c e p v l _ o c c . v 2 -
idt ? / ics ? 3.3v, 2.5v lvpecl/ lvcmos fanout buffer 6 ics8536cgi-33 rev. b october 27, 2008 ICS8536I-33 low skew, 1-to-6, crystal oscillator/lvcmos-to-3.3v, 2.5v lvpecl/lvcmos fanout buffer t able 6a. lvpecl ac c haracteristics , v cc = v cco_lvpecl = 3.3v5%, v ee = 0v, t a = -40c to 85c t able 6b. lvpecl ac c haracteristics , v cc = v cco_lvpecl = 2.5v5%, v ee = 0v, t a = -40c to 85c 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 6 6 2z h m t d p 1 e t o n ; y a l e d n o i t a g a p o r p 2 . 15 9 . 1s n t t i j ; s m r , r e t t i j e s a h p e v i t i d d a r e f f u b n o i t c e s r e t t i j e s a h p e v i t i d d a o t r e f e r , z h m 2 5 . 5 5 1 : e g n a r n o i t a r g e t n i ( ) z h m 0 2 - z h k 2 1 5 3 . 0s p t ) b ( k s5 , 2 e t o n ; w e k s k n a b 5 5s p t ) o ( k s5 , 3 e t o n ; w e k s t u p t u o 0 8s p t ) p p ( k s5 , 4 e t o n ; w e k s t r a p - o t - t r a p 0 0 8s 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 5 20 0 6s p c d oe l c y c y t u d t u p t u o 6 44 5% ? t a d e r u s a e m s r e t e m a r a p l l a . e s i w r e h t o d e t o n s s e l n u z h m 6 6 2 v e h t m o r f d e r u s a e m : 1 e t o n c c . t n i o p g n i s s o r c t u p t u o l a i t n e r e f f i d e h t o t t u p n i e h t f o 2 / . 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 e m a s e h t t a s t u p t u o f o k n a b a n i h t i w w e k s s a d e n i f e d : 2 e t o n . 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 : 3 e t o n . s t n i o p s s o r c l a i t n e r e f f i d t u p t u o l c e p v l e h t t a d e r u s a e m 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 g n i t a r e p o s e c i v e d t n e r e f f i d n o 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 : 4 e t o n s s o r c l a i t n e r e f f i d t u p t u o l c e p v l e h t t a d e r u s a e m e r a s t u p t u o e h t , e c i v e d h c a e n o s t u p n i f o e p y t e m a s e h t g n i s u . s n o i t i d n o c . s t n i o p . 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 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 6 6 2z h m t d p 1 e t o n ; y a l e d n o i t a g a p o r p 3 . 12s n t t i j ; s m r , r e t t i j e s a h p e v i t i d d a r e f f u b n o i t c e s r e t t i j e s a h p e v i t i d d a o t r e f e r , z h m 2 5 . 5 5 1 : e g n a r n o i t a r g e t n i ( ) z h m 0 2 - z h k 2 1 2 3 . 0s p t ) b ( k s5 , 2 e t o n ; w e k s k n a b 5 6s p t ) o ( k s5 , 3 e t o n ; w e k s t u p t u o 0 8s p t ) p p ( k s5 , 4 e t o n ; w e k s t r a p - o t - t r a p 5 2 4s 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 5 20 0 8s p c d oe l c y c y t u d t u p t u o 6 44 5% ? t a d e r u s a e m s r e t e m a r a p l l a . e s i w r e h t o d e t o n s s e l n u z h m 6 6 2 v e h t m o r f d e r u s a e m : 1 e t o n c c . t n i o p g n i s s o r c t u p t u o l a i t n e r e f f i d e h t o t t u p n i e h t f o 2 / . 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 e m a s e h t t a s t u p t u o f o k n a b a n i h t i w w e k s s a d e n i f e d : 2 e t o n . 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 : 3 e t o n . s t n i o p s s o r c l a i t n e r e f f i d t u p t u o l c e p v l e h t t a d e r u s a e m 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 g n i t a r e p o s e c i v e d t n e r e f f i d n o 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 : 4 e t o n s s o r c l a i t n e r e f f i d t u p t u o l c e p v l e h t t a d e r u s a e m e r a s t u p t u o e h t , e c i v e d h c a e n o s t u p n i f o e p y t e m a s e h t g n i s u . s n o i t i d n o c . s t n i o p . 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 ? 3.3v, 2.5v lvpecl/ lvcmos fanout buffer 7 ics8536cgi-33 rev. b october 27, 2008 ICS8536I-33 low skew, 1-to-6, crystal oscillator/lvcmos-to-3.3v, 2.5v lvpecl/lvcmos fanout buffer t able 6c. lvcmos ac c haracteristics , v cc = v cco_lvcmos = 3.3v5%, t a = -40c to 85c t able 6d. lvcmos ac c haracteristics , v cc = v cco_lvcmos = 2.5v5%, t a = -40c to 85c 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 6 6 2z h m t d p 1 e t o n ; y a l e d n o i t a g a p o r p 4 . 25 . 3s n t t i j ; s m r , r e t t i j e s a h p e v i t i d d a r e f f u b n o i t c e s r e t t i j e s a h p e v i t i d d a o t r e f e r , z h m 2 5 . 5 5 1 : e g n a r n o i t a r g e t n i ( ) z h m 0 2 - z h k 2 1 5 3 . 0s p t ) b ( k s5 , 2 e t o n ; w e k s k n a b 5 6s p t ) o ( k s5 , 3 e t o n ; w e k s t u p t u o 0 8s p t ) p p ( k s5 , 4 e t o n ; w e k s t r a p - o t - t r a p 0 3 7 . 00 0 8s 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 23 . 05 1 . 1s n c d oe l c y c y t u d t u p t u o 6 44 5% ? t a d e r u s a e m s r e t e m a r a p l l a . e s i w r e h t o d e t o n s s e l n u z h m 6 6 2 v e h t m o r f d e r u s a e m : 1 e t o n c c v o t t u p n i e h t f o 2 / s o m c v l _ o c c . t u p t u o e h t f o 2 / . 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 e m a s e h t t a s t u p t u o f o k n a b a n i h t i w w e k s s a d e n i f e d : 2 e t o n . 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 : 3 e t o n v t a d e r u s a e m s o m c v l _ o c c . 2 / 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 g n i t a r e p o s e c i v e d t n e r e f f i d n o 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 : 4 e t o n v t a d e r u s a e m e r a s t u p t u o e h t , e c i v e d h c a e n o s t u p n i f o e p y t e m a s e h t g n i s u . s n o i t i d n o c s o m c v l _ o c c . 2 / . 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 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 6 6 2z h m t d p 1 e t o n ; y a l e d n o i t a g a p o r p 5 . 25 7 . 3s n t t i j ; s m r , r e t t i j e s a h p e v i t i d d a r e f f u b n o i t c e s r e t t i j e s a h p e v i t i d d a o t r e f e r , z h m 2 5 . 5 5 1 : e g n a r n o i t a r g e t n i ( ) z h m 0 2 - z h k 2 1 2 3 . 0s p t ) b ( k s5 , 2 e t o n ; w e k s k n a b 5 7s p t ) o ( k s5 , 3 e t o n ; w e k s t u p t u o 0 8s p t ) p p ( k s5 , 4 e t o n ; w e k s t r a p - o t - t r a p 0 0 8s 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 25 2 4 . 05 8 . 1s n c d oe l c y c y t u d t u p t u o 6 44 5% ? t a d e r u s a e m s r e t e m a r a p l l a . e s i w r e h t o d e t o n s s e l n u z h m 6 6 2 v e h t m o r f d e r u s a e m : 1 e t o n c c v o t t u p n i e h t f o 2 / s o m c v l _ o c c . t u p t u o e h t f o 2 / . 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 e m a s e h t t a s t u p t u o f o k n a b a n i h t i w w e k s s a d e n i f e d : 2 e t o n . 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 : 3 e t o n v t a d e r u s a e m s o m c v l _ o c c . 2 / 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 g n i t a r e p o s e c i v e d t n e r e f f i d n o 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 : 4 e t o n v t a d e r u s a e m e r a s t u p t u o e h t , e c i v e d h c a e n o s t u p n i f o e p y t e m a s e h t g n i s u . s n o i t i d n o c s o m c v l _ o c c . 2 / . 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 ? 3.3v, 2.5v lvpecl/ lvcmos fanout buffer 8 ics8536cgi-33 rev. b october 27, 2008 ICS8536I-33 low skew, 1-to-6, crystal oscillator/lvcmos-to-3.3v, 2.5v lvpecl/lvcmos fanout buffer p arameter m easurement i nformation 3.3v lvcmos o utput l oad ac t est c ircuit 3.3v lvpecl o utput l oad ac t est c ircuit scope qx nqx lvpecl v ee 2v -1.3v 0.165v t pd v cc 2 clk q0:q2 nq0:nq2 v cc, v cco_lvpecl 2.5v lvpecl o utput l oad ac t est c ircuit scope qx lvcmos gnd 1.25v5% -1.25v5% v cc , v cco_lvcmos lvpecl p ropagation d elay t pd v cc 2 v cco_lvcmos 2 clk q3:q5 2.5v lvcmos o utput l oad ac t est c ircuit lvcmos p ropagation d elay scope qx lvcmos gnd 1.65v5% -1.65v5% v cc , v cco_lvcmos scope qx nqx lvpecl v ee 2v -0.5v 0.125v v cc, v cco_lvpecl
idt ? / ics ? 3.3v, 2.5v lvpecl/ lvcmos fanout buffer 9 ics8536cgi-33 rev. b october 27, 2008 ICS8536I-33 low skew, 1-to-6, crystal oscillator/lvcmos-to-3.3v, 2.5v lvpecl/lvcmos fanout buffer 20% 80% 80% 20% t r t f v sw i n g t pw t period t pw t period odc = x 100% q0:q2 nq0:nq2 lvpecl o utput r ise /f all t ime lvpecl o utput d uty c ycle /p ulse w idth /p eriod 20% 80% 80% 20% t r t f t period t pw t period odc = x 100% v cco_lvcmos 2 t pw q3:q5 lvcmos o utput d uty c ycle /p ulse w idth /p eriod lvcmos o utput r ise /f all t ime b ank s kew t sk(b) v cco_lvcmos /2 nqx qx qy lvpecl o utput s kew t sk(o) nqx qx nqy qy lvcmos o utput s kew t sk(o) v cco_lvcmos 2 v cco_lvcmos 2 qx qy q0:q2 nq0:nq2 q3:q5
idt ? / ics ? 3.3v, 2.5v lvpecl/ lvcmos fanout buffer 10 ics8536cgi-33 rev. b october 27, 2008 ICS8536I-33 low skew, 1-to-6, crystal oscillator/lvcmos-to-3.3v, 2.5v lvpecl/lvcmos fanout buffer a pplication i nformation f igure 2. c rystal i npu t i nterface c rystal i nput i nterface the ICS8536I-33 has been characterized with 18pf parallel resonant crystals. the capacitor values, c1 and c2, shown in figure 2 below were determined using an 18pf parallel resonant crystal and were chosen to minimize the ppm error. these same capacitor values will tune any 18pf parallel resonant crystal over the frequency range and other parameters speci- fied in this data sheet. the optimum c1 and c2 values can be slightly adjusted for different board layouts. i nputs : c rystal i nputs for applications not requiring the use of the crystal oscillator input, both xtal_in and xtal_out can be left floating. though not required, but for additional protection, a 1k resistor can be tied from xtal_in to ground. clk i nput for applications not requiring the use of a clock input, it can be left floating. though not required, but for additional protection, a 1k resistor can be tied from the clk input to ground. 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. lvpecl o utputs all unused lvpecl outputs can be left floating. we recommend that there is no trace attached. both sides of the differential output pair should either be left floating or terminated. c1 27p x1 18pf parallel crystal c2 27p xtal_out xtal_in
idt ? / ics ? 3.3v, 2.5v lvpecl/ lvcmos fanout buffer 11 ics8536cgi-33 rev. b october 27, 2008 ICS8536I-33 low skew, 1-to-6, crystal oscillator/lvcmos-to-3.3v, 2.5v lvpecl/lvcmos fanout buffer v cc - 2v 50 50 rtt z o = 50 z o = 50 fout fin rtt = z o 1 ((v oh + v ol ) / (v cc ? 2)) ? 2 3.3v 125 125 84 84 z o = 50 z o = 50 fout fin the clock layout topology shown below is a typical termination for lvpecl outputs. the two different layouts mentioned are recommended only as guidelines. fout and nfout are low impedance follower outputs that generate ecl/lvpecl compatible outputs. therefore, termi- nating resistors (dc current path to ground) or current sources must be used for functionality. these outputs are designed to drive 50 transmission lines. matched impedance techniques should be used to maximize operating frequency and minimize signal distortion. figures 4a and 4b show two different layouts which are recommended only as guidelines. other suitable clock layouts may exist and it would be recommended that the board designers simulate to guarantee compatibility across all printed circuit and clock component process variations. t ermination for 3.3v lvpecl o utputs f igure 4b. lvpecl o utput t ermination f igure 4a. lvpecl o utput t ermination lvcmos to xtal i nterface the xtal_in input can accept a single-ended lvcmos signal through an ac coupling 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 f igure 3. g eneral d iagram for lvcmos d river to xtal i nput i nterface 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 . r2 zo = 50 vdd ro zo = ro + rs r1 vdd xta l _i n xta l _o u t .1uf rs
idt ? / ics ? 3.3v, 2.5v lvpecl/ lvcmos fanout buffer 12 ics8536cgi-33 rev. b october 27, 2008 ICS8536I-33 low skew, 1-to-6, crystal oscillator/lvcmos-to-3.3v, 2.5v lvpecl/lvcmos fanout buffer t ermination for 2.5v lvpecl o utputs figure 5a and figure 5b show examples of termination for 2.5v lvpecl driver. these terminations are equivalent to terminating 50 to v cc ? 2v. for v cco = 2.5v, the v cco_l vcmos ? 2v is very close to _lvcmosground level. the r3 in figure 5b can be eliminated and the termination is shown in figure 5c. f igure 5c. 2.5v lvpecl t ermination e xample r2 50 zo = 50 ohm vcco=2.5v r1 50 zo = 50 ohm + - 2.5v 2,5v lvpecl driv er f igure 5b. 2.5v lvpecl d river t ermination e xample vcco=2.5v r1 50 r2 50 zo = 50 ohm r3 18 2,5v lvpecl driv er zo = 50 ohm + - 2.5v f igure 5a. 2.5v lvpecl d river t ermination e xample r2 62.5 2.5v 2,5v lvpecl driv er r3 250 zo = 50 ohm zo = 50 ohm r4 62.5 2.5v + - r1 250 vcco=2.5v
idt ? / ics ? 3.3v, 2.5v lvpecl/ lvcmos fanout buffer 13 ics8536cgi-33 rev. b october 27, 2008 ICS8536I-33 low skew, 1-to-6, crystal oscillator/lvcmos-to-3.3v, 2.5v lvpecl/lvcmos fanout buffer p ower c onsiderations this section provides information on power dissipation and junction temperature for the ICS8536I-33. equations and example calculations are also provided. 1. power dissipation. the total power dissipation for the ICS8536I-33 is the sum of the core power plus the power dissipated in the load(s). the following is the power dissipation for v cc = 3.3v + 5% = 3.465v, which gives worst case results. note: please refer to section 3 for details on calculating power dissipated in the load. core and lvpecl output power dissipation ? power (core) max = v cc_max * i ee_max = 3.465v * 80ma = 277.2mw ? power (outputs) max = 30mw/loaded output pair if all outputs are loaded, the total power is 3 * 30mw = 90mw lvcmos output power dissipation ? output impedance r out power dissipation due to loading 50 to v cco_l vcmos /2 output current i out = v cco_max / [2 * (50 + r out )] = 3.465v / [2 * (50 + 15 ] = 26.7ma ? power dissipation on the r out per lvcmos output power (r out ) = r out * (i out ) 2 = 15 * (26.7ma) 2 = 10.7mw per output ? total power dissipation on the r out total power (r out ) = 10.7mw * 3 = 32.1mw total power dissipation ? total power = power (lvpecl) + total power (r out ) = 277.2mw + 90mw + 32.1mw = 399.3mw
idt ? / ics ? 3.3v, 2.5v lvpecl/ lvcmos fanout buffer 14 ics8536cgi-33 rev. b october 27, 2008 ICS8536I-33 low skew, 1-to-6, crystal oscillator/lvcmos-to-3.3v, 2.5v lvpecl/lvcmos fanout buffer 2. junction temperature. junction temperature, tj, is the t emperature at the junction of the bond wire and bond pad and directly affects the reliability of the device. the maximum recommended junction temperature for hiperclocks tm devices is 125c. the equation for tj is as follows: tj = ja * pd_total + t a tj = junction temperature ja = junction-to-ambient thermal resistance pd_total = total device power dissipation (example calculation is in section 1 above) t a = ambient temperature in order to calculate junction temperature, the appropriate junction-to-ambient thermal resistance ja must be used. assuming no air flow and a multi-layer board, the appropriate value is 91.1c/w per table 7 below. therefore, tj for an ambient temperature of 85c with all outputs switching is: 85c + 0.3993w * 91.1c/w = 121.4c. this is below the limit of 125c. this calculation is only an example. tj will obviously vary depending on the number of loaded outputs, supply voltage, air flow , and the type of board (single layer or multi-layer). t able 7. t hermal r esistance ja for 20- pin tssop, f orced c onvection ja by velocity (linear feet per minute) 0 200 500 multi-layer pcb, jedec standard test boards 91.1c/w 86.7c/w 84.6c/w
idt ? / ics ? 3.3v, 2.5v lvpecl/ lvcmos fanout buffer 15 ics8536cgi-33 rev. b october 27, 2008 ICS8536I-33 low skew, 1-to-6, crystal oscillator/lvcmos-to-3.3v, 2.5v lvpecl/lvcmos fanout buffer 3. calculations and equations. the purpose of this section is to derive the power dissipated into the load. lvpecl output driver circuit and termination are shown in figure 6. t o calculate worst case power dissipation into the load, use the following equations which assume a 50 load, and a termination voltage of v cco ? 2v. ? for logic high, v out = v oh_max = v cco_max ? 0.9v (v cco_max ? v oh_max ) = 0.9v ? for logic low, v out = v ol_max = v cco_max ? 1.7v (v cco_max ? v ol_max ) = 1.7v pd_h is power dissipation when the output drives high. pd_l is the power dissipation when the output drives low. pd_h = [(v oh_max ? (v cco_max ? 2v))/r l ] * (v cco_max ? v oh_max ) = [(2v ? (v cc_max ? v oh_max )) /r l ] * (v cc_max ? v oh_max ) = [(2v ? 0.9v)/50 ] * 0.9v = 19.8mw pd_l = [(v ol_max ? (v cco_max ? 2v))/r l ] * (v cco_max ? v ol_max ) = [(2v ? (v cco_max ? v ol_max )) /r l ] * (v cco_max ? v ol_max ) = [(2v ? 1.7v)/50 ] * 1.7v = 10.2mw total power dissipation per output pair = pd_h + pd_l = 30mw f igure 6. lvpecl d river c ircuit and t ermination v out v cco v cco - 2v q1 rl 50
idt ? / ics ? 3.3v, 2.5v lvpecl/ lvcmos fanout buffer 16 ics8536cgi-33 rev. b october 27, 2008 ICS8536I-33 low skew, 1-to-6, crystal oscillator/lvcmos-to-3.3v, 2.5v lvpecl/lvcmos fanout buffer p ackage o utline - g s uffix for 20 l ead tssop t able 9. p ackage d imensions reference document: jedec publication 95, mo-153 l o b m y s s r e t e m i l l i m n i mx a m n0 2 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 4 . 60 6 . 6 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 r eliability i nformation t ransistor c ount the transistor count for ICS8536I-33 is: 550 t able 8. ja vs . a ir f low t able for 20 l ead tssop ja by velocity (meters per second) 0 1 2.5 multi-layer pcb, jedec standard test boards 91.1c/w 86.7c/w 84.6c/w p ackage o utline & p ackage d imensions
idt ? / ics ? 3.3v, 2.5v lvpecl/ lvcmos fanout buffer 17 ics8536cgi-33 rev. b october 27, 2008 ICS8536I-33 low skew, 1-to-6, crystal oscillator/lvcmos-to-3.3v, 2.5v lvpecl/lvcmos 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 and industrial applications. any other applications such as those requiring high reliability or other extraordinary environmental r equirements 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 in life support devices or critical medical instruments. t able 10. 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 3 3 - i g c 6 3 5 8 3 3igc6358sc ip osstdael0 2e bu tc 58otc04- t 3 3 - i g c 6 3 5 8 3 3igc6358sc ip osstdael0 2l eer&epat005 2c 58otc04- f l 3 3 - i g c 6 3 5 8 l 33ic6358sc ip osst"eerf-dael"dae l0 2e bu tc 58otc04- t f l 3 3 - i g c 6 3 5 8 l 33ic6358sc ip osst"eerf-dael"dael0 2l eer&epat005 2c 58otc04- . t n a i l p m o c s h o r e r a d n a n o i t a r u g i f n o c e e r f - b p e h t e r a r e b m u n t r a p e h t o t x i f f u s " f l " n a h t i w d e r e d r o e r a t a h t s t r a p : e t o n
idt ? / ics ? 3.3v, 2.5v lvpecl/ lvcmos fanout buffer 18 ics8536cgi-33 rev. b october 27, 2008 ICS8536I-33 low skew, 1-to-6, crystal oscillator/lvcmos-to-3.3v, 2.5v lvpecl/lvcmos 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 b 1 t 1 2 . 4 1 & 3 1 s n i p d e t c e r r o c - t n e m n g i s s a n i p . 4 1 & 3 1 n i p d e t c e r r o c - e l b a t n o i t p i r c s e d n i p 8 0 / 5 2 / 6
ICS8536I-33 low skew, 1-to-6, crystal oscillator/lvcmos-to-3.3v, 2.5v lvpecl/lvcmos fanout buffer innovate with idt and accelerate your future networks. contact: www.idt.com for sales 800-345-7015 (inside usa) +408-284-8200 (outside usa) fax: 408-284-2775 www.idt.com/go/contactidt for tech support netcom@idt.com +480-763-2056 corporate headquarters integrated device technology, inc. 6024 silver creek valley road san jose, ca 95138 united states 800-345-7015 (inside usa) +408-284-8200 (outside usa) ? 2008 integrated device technology, inc. all rights reserved. product spe cifications 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

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