bl 3257 http://www.belling.com.cn - 1 - total 7 pages 4 channel 2:1 switch BL3257 description BL3257 i s a quad single pole/double throw high - speed cmos ttl - compatible bus switch. the low on resistance of the switch allows inputs to be connected to outputs without adding propaga tion delay or generating additional ground bounce noise. also this device has exceptionally high current capability, which is far greater than most analog switches offered today. a single 5v supply is all that is required for operation. applications ? set top boxes ? flat panel displays ? crt displays ? dvd - rw features 1 vcc 4.0v - 5.5v 2 low on - resistance: 5 ? 3 fast switching : 10.0ns ( vdd=5v) 4 low crosstalk: - 70db (vdd = 5 v) 6 packaging( pb - free & green available ): sop - 16 ssop - 16 6 esd >40 00v hbm pin configuration block diagram d a s 1 a s 2 a d b s 1 b s 2 b d c s 1 c s 2 c d d s 1 d s 2 d 2 3 4 5 6 7 11 10 14 13 9 12 en in 1 15 decoder/ drivers in s 1 a s 2 a d a s 1 b s 2 b d b gnd v dd en s 1 d d d s 2 d s 2 c d c s 1 c
bl 3257 http://www.belling.com.cn - 2 - total 7 pages order information part number package shipping bl 3257so sop16 tube bl 3257ss s sop 16 500 0 pcs / tape & reel pin description pin name description v dd power gnd ground d a , d b , d c , d d analog video i/o s 1 a, s 1 b, s 1 c, s 1 d analog video 1 i/o s 2 a, s 2 b, s 2 c, s 2 d analog video 2 i/o in select input enn enable function table enn s on switch 0 1 s 2 (s 2 a , s 2 b , s 2 c , s 2 d) 0 0 s1 (s 1 a , s 1 b , s 1 c , s 1 d) 1 x disa bled
bl 3257 http://www.belling.com.cn - 3 - total 7 pages electrical characteristics 1 absolute maximum ratings symbol parameter units v dd supply voltage - 0.5 to + 6 .0 v v is analog input voltage (v s1 , v s2 , or v d ) - 0.5 to + 6 .0 v v s v enn digital select input voltage - 0.5 to + 6 .0 v l anll contin uous dc current from d to s1 / s2 200 ma maximum ratings are those values beyond which device damage can occur. if these limits are exceeded, device functional operation is not implied, damage may occur and reliability may be affected. 2 recommended ope rating conditions symbol parameter min max units v dd supply voltage 4.0 5.5 v v is analog input voltage (v s1 , v s2 , or v d ) 0 2 v v s v enn digital select input voltage 0 v dd v t a operating temperature - 40 85 3 electrical characteristics parameter symbol test conditions min typ max units dc electrical characteristics switch on resistance r on v dd = 4.5v, v is = 1.0v, r l = 75 ? is = 13ma 5 7 ? dd = 4.5v, v is = 2.0v, r l = 75 ? is = 26ma 7.5 10 ? ih guaranteed logi c high level 2.0 v low level input voltage v il guaranteed logic low level - 0.5 0.8 v input high current i i h v dd = 5.5v, v in = v dd i l v dd = s.5v, v in = gnd s1, s2, or d ik v dd = 4.5v, i in = - 18ma - 0.9 v input hysteresis v h 200 mv
bl 3257 http://www.belling.com.cn - 4 - total 7 pages ac electrical characteristics turn on time t on r l = 70 ? , c l = 20pf 8 1 5 ns turn off time t off r l = 7 0 ? , c l = 20pf 4 8 ns cross talk x talk r in = 10 ? , r l = 150 ? , f = 10mhz - 70 db enable input capacitance c in vin = 0v, f = 1mhz 5 pf off state input capacitance c o f f vin = 0v, f = 1mhz 10 pf on state input capacitance c on vin = 0v, f = 1mhz 15 pf power supply characteristics quiescent supply current i dd v dd = +5.5v, in = gnd or 5v 0.1 1 0.0 a supply current change when changing input i dd v dd = +5.5v, in = 3.4v 300 a supply current when toggle input i dd d v dd = +5.5v, s1, s2 and d pins open en n = gnd control input toggling 50% duty cycle 0.1 ma/ mhz
bl 3257 http://www.belling.com.cn - 5 - total 7 pages test setup circuits figure1. test circuit for on resistance figure2. test circuit for bandwidth
bl 3257 http://www.belling.com.cn - 6 - total 7 pages package outline dimensions sop1 6
bl 3257 http://www.belling.com.cn - 7 - total 7 pages ssop16
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