? 2000 california micro devices corp. all rights reserved. 4/00 215 topaz street, milpitas, california 95035 tel: (408) 263-3214 fax: (408) 263-7846 www.calmicro.com 1 california micro devices pacdn010 c0120497d features ? provides proper bus termination independent of card loading conditions ? schottky diode technology; fast turn on and reverse recovery characteristics ? 36 integrated diodes in a single package offers 18 channel, dual rail clamping action ? 24-pin qsop package saves board space and eases layout in space critical bus termination applications ? available in 24 pin tssop package for component height constrained modules product description reflections on high speed memory buses lead to undershoot and overshoot disturbances which may result in improper system operation. resistor terminations, when used to terminate high speed memory or data lines, increase power consumption and degrade output (high) levels resulting in reduced noise immunity. schottky diode termination is the best overall solution for applications in which power consumption and noise immunity are critical considerations. camd?s p/active dn010 schottky diode memory bus terminator ? is specifically designed to minimize undershoot/ overshoot disturbances caused by reflection noise on sdram bus lines as well as v2.1 66mhz pci buses. this highly integrated schottky diode network provides very effective termination performance for high speed memory bus lines under variable loading conditions. the packaged device supports up to 18 terminated lines ? each of which can be simultaneously clamped to both ground and power supply rail. applications ? sdram memory bus termination ? pci v2.1 bus termination for intel-based pentium? and pentium pro systems p/active ? schottky diode memory bus terminator refer to ap-201 termination application note for further information. p/active? is a trademark of california micro devices corp. pentium pro is a registered trademark of intel. ? covered by one or more of u.s. pat. nos. 5,355,014, 5,370,766, and 5,514,612 and other pending applications. 24 123456789101112 23 22 21 20 19 18 13 14 17 15 16 vdd vdd vdd gnd gnd gnd schematic configuration
? 2000 california micro devices corp. all rights reserved. 4/00 215 topaz street, milpitas, california 95035 tel: (408) 263-3214 fax: (408) 263-7846 www.calmicro.com 2 california micro devices pacdn010 the absolute maximum ratings are limiting values, to be applied individually, beyond which the device may be permanently damage d. functional operation under any of these conditions is not guaranteed. exposing the device to its absolute maximum rating may affect its reliability. note 1: the presence of a schottky diode for clamping bus overshoots will cause additional delays of signal edges. these delays are th e result of diode characteristics such as forward voltage, diode capacitance and the reverse recovery phenomenon. the ground clamp diode is most critical, particularly if vlsi circuits such as static or dynamic memories are directly connected to busses without any buffer stages. t he incremental delay observed on a positive edge following a negative transition that forward biased the schottky diode is less than 800 ps. that r epresents less than 10% of the 125 mhz (8 ns period) bus cycle time. n o i t a m r o f n i g n i r e d r o t r a p d r a d n a t s e g a k c a pr e b m u n t r a p g n i r e d r o s n i pe l y t ss e b u tl e e r & e p a tg n i k r a m t r a p 4 2p o s qt / q 0 1 0 n d c a pr / q 0 1 0 n d c a pq 0 1 0 n d c a p 4 2p o s s tt / t 0 1 0 n d c a pr / t 0 1 0 n d c a pt 0 1 0 n d c a p n o i t a c i f i c e p s d r a d n a t s s g n i t a r m u m i x a m e t u l o s b a r e t e m a r a pl o b m y sg n i t a r e g a t l o v y l p p u sv d d v 7 o t v 3 . 0 - ) s u o u n i t n o c ( t n e r r u c p m a l c l e n n a h c i p m a l c a m 0 5 e r u t a r e p m e t g n i t a r e p o c 0 7 o t c 0 e r u t a r e p m e t e g a r o t sg t s tc 0 5 1 o t c 0 6 - g n i t a r r e w o p e g a k c a pc 0 7 @ p o s q. x a m , w 0 0 . 1 c 0 7 @ p o s q. x a m , w 0 0 . 1 t ( s c i t s i r e t c a r a h c e d o i d a ) c 0 7 o t c 0 = r e t e m a r a pn o i t i d n o cn i mp y tx a m e g a t l o v d r a w r o f e d o i di f a m 6 1 =v 5 6 . 0v 5 8 . 0 i f a m 0 5 =v 0 8 . 0v 0 . 1 ) 1 e t o n e e s ( d e e p s s u b . x a mz 0 0 5 = w v 0 . 3 o t v 4 . 0 g n i w s c i g o l ,z h m 5 2 1 e g a k a e l l e n n a h c0 v n i v d d 1 . 0 m a5 m a e c n a t i c a p a c t u p n iv , z h m 1 = f n i v , c 5 2 = a t , v 5 . 2 = d d v 0 . 5 =f p 5 n o i t c e t o r p d s e5 1 0 3 d o h t e m , 3 8 8 - d t s - l i mv k 2
? 2000 california micro devices corp. all rights reserved. 4/00 215 topaz street, milpitas, california 95035 tel: (408) 263-3214 fax: (408) 263-7846 www.calmicro.com 3 california micro devices pacdn010 e d c b e l h h 1 a a 1 power derating curve n qsop - top view camd s n o i t a c i f i c e p s l a c i n a h c e m g n i t a l p d a e ld a e l - n i t l a i r e t a m d a e ly o l l a r e p p o c y t i r a n a l p o c d a e l) m m 2 0 1 . 0 ( " 4 0 0 . 0 l a i r e t a m e t a r t s b u sn o c i l i s l a i r e t a m y d o by x o p e d e d l o m y i t l i b a m m a l f0 - v 4 9 l u n o i t a m r o f n i & n o i t a p i s s i d r e w o p , s n o i s n e m i d e g a k c a p e g a k c a pp o s q s n i p4 2 c e d e j7 3 1 o m m ms e h c n i n i mx a mn i mx a m a 5 3 . 15 7 . 13 5 0 . 09 6 0 . 0 a 1 0 1 . 05 2 . 04 0 0 . 00 1 0 . 0 b 0 2 . 00 3 . 08 0 0 . 02 1 0 . 0 c 8 1 . 05 2 . 07 0 0 . 00 1 0 . 0 d 6 5 . 83 7 . 87 3 3 . 04 4 3 . 0 e 1 8 . 38 9 . 30 5 1 . 07 5 1 . 0 e c s b 4 6 . 0c s b 5 2 0 . 0 h 9 7 . 59 1 . 68 2 2 . 04 4 2 . 0 l 0 4 . 07 2 . 16 1 0 . 00 5 0 . 0 p d c 0 7 @w 0 0 . 1 e b u t / #s c p 8 5 l e e r & e p a t / #s c p 0 0 5 , 2
? 2000 california micro devices corp. all rights reserved. 4/00 215 topaz street, milpitas, california 95035 tel: (408) 263-3214 fax: (408) 263-7846 www.calmicro.com 4 california micro devices pacdn010 power derating curve e d c b e l h h 1 a a 1 tssop - top view camd n o i t a m r o f n i & n o i t a p i s s i d r e w o p , s n o i s n e m i d e g a k c a p e g a k c a pp o s s t s n i p4 2 c e d e j3 5 1 o m m ms e h c n i n i mx a mn i mx a m a -0 1 . 1- 3 3 4 . 0 a 1 5 0 . 05 1 . 02 0 0 . 06 0 0 . 0 b 9 1 . 00 3 . 05 7 0 0 . 08 1 1 0 . 0 c 9 0 . 00 2 . 05 3 0 0 . 09 7 0 0 . 0 d 0 7 . 70 9 . 73 0 3 . 01 1 3 . 0 e 0 3 . 40 5 . 49 6 1 . 07 7 1 . 0 e c s b 5 6 . 0c s b 6 5 2 0 . 0 h 5 2 . 60 5 . 66 4 2 . 06 5 2 . 0 l 0 5 . 00 7 . 00 2 0 . 08 2 0 . 0 p d c 0 7 @w 0 0 . 1 e b u t / #s c p 2 6 l e e r & e p a t / #s c p 0 0 5 , 2 s n o i t a c i f i c e p s l a c i n a h c e m g n i t a l p d a e ld a e l - n i t l a i r e t a m d a e ly o l l a r e p p o c y t i r a n a l p o c d a e l) m m 2 0 1 . 0 ( " 4 0 0 . 0 l a i r e t a m e t a r t s b u sn o c i l i s l a i r e t a m y d o by x o p e d e d l o m y i t l i b a m m a l f0 - v 4 9 l u
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