? 2000 fairchild semiconductor corporation ds500325 www.fairchildsemi.com january 2000 revised november 2000 NC7SB3257 tinylogic ? uhs single 2-to-1 multiplexer/demultiplexer bus switch NC7SB3257 tinylogic ? uhs single 2-to-1 multiplexer/demultiplexer bus switch general description the NC7SB3257 is a high performance, 2-to-1 nmos passgate multiplexer/demultiplexer from fairchild?s ultra high speed series of tinylogic ? . the device is fabricated with advanced sub-micron cmos technology to achieve high speed enable and disable times and low on resis- tance. the device is specified to operate over the 4.0 to 5.5v v cc operating range. the control input tolerates volt- ages up to 5.5v independent of the v cc operating range. features space saving sc70 6-lead surface mount package typical 3 ? switch resistance @ 5.0v v cc minimal propagation delay through the switch power down high impedance control input zero bounce in flow through mode ttl compatible control input overvoltage tolerance of control input to 7.0v break before make enable circuitry ordering code: logic symbol pin descriptions function table h = high logic level l = low logic level connection diagram (top view) pin one orientation diagram aaa = product code top mark - see ordering code note: orientation of top mark determines pin one location. read the top product code mark left to right, pin one is the lower left pin (see diagram). tinylogic ? is a trademark of fairchild semiconductor corporation. order number package number product code top mark package description supplied as NC7SB3257p6x maa06a b7b 6-lead sc70, eiaj sc88, 1.25mm wide 3k units on tape and reel pin names description a, b 0 , b 1 data ports s control input input (s) function lb 0 connected to a hb 1 connected to a
www.fairchildsemi.com 2 NC7SB3257 absolute maximum ratings (note 1) recommended operating conditions (note 2) note 1: absolute maximum ratings are dc values beyond which the device may be damaged or have its useful life impaired. the datasheet specifica- tions should be met, without exception, to ensure that the system design is reliable over its power supply, temperature, and output/input loading vari- ables. fairchild does not recommend operation outside datasheet specifi- cations. note 2: control input must be held high or low, it must not float. note 3: the input and output negative voltage ratings may be exceeded if the input and output diode current ratings are observed. dc electrical characteristics note 4: measured by the voltage drop between a and b pins at the indicated current through the switch. on resistance is determined by t he lower of the volt- ages on the two (a or b ports). note 5: per ttl driven input (v in = 3.4v, control input only). a and b pins do not contribute to i cc . supply voltage (v cc ) ? 0.5v to + 7.0v dc switch voltage (v s ) ? 0.5v to + 7.0v dc output voltage (v in ) ? 0.5v to + 7.0v dc input diode current (i ik ) @ (i ik ) v in < 0v ? 50 ma dc output current (i out )128 ma dc v cc or ground current (i cc /i gnd ) 100 ma storage temperature range (t stg ) ? 65 c to + 150 c junction lead temperature under bias (t j ) + 150 c lead temperature (t l ) (soldering, 10 seconds) + 260 c power dissipation (p d ) @ + 85 c180 mw supply voltage operating (v cc ) 4.0v to 5.5v control input voltage (v in ) 0v to v cc switch input voltage (v in ) 0v to v cc output voltage (v out ) 0v to v cc operating temperature (t a ) ? 40 c to + 85 c input rise and fall time (t r , t f ) control input v cc = 4.0v to 5.5v 0 ns/v to 5 ns/v thermal resistance ( ja )350 c/w symbol parameter v cc t a = ? 40 c to + 85 c units conditions (v) min typ max v ik clamp diode voltage 4.5 ? 1.2 v i in = ? 18 ma v ih high level input voltage 4.5 ? 5.5 2.0 v v il low level input voltage 4.5 ? 5.5 0.8 i in input leakage current 5.5 1 a0 v in 5.5v i off off state leakage current 5.5 1 a0 a, b v cc r on switch on resistance (note 4) 4.5 3 7 ? v in = 0v, i in = 64 ma 4.5 3 7 ? v in = 0v, i in = 30 ma 4.5 6 15 ? v in = 2.4v, i in = 15 ma 4.0 10 20 ? v in = 2.4v, i in = 15 ma i cc quiescent supply current 5.5 10 av in = v cc or gnd i out = 0 ? i cc increase in i cc per input (note 5) 5.5 0.9 2.5 ma v in = 3.4v, i o = 0 control input only
3 www.fairchildsemi.com NC7SB3257 ac electrical characteristics note 6: this parameter is guaranteed by design but not tested. the bus switch contributes no propagation delay other than the rc delay of the on resistance of the switch and the 50 pf load capacitance, when driven by an ideal voltage source (zero output impedance). note 7: guaranteed by design. capacitance (note 8) note 8: capacitance is characterized but not tested. symbol parameter t a = ? 40 c to + 85 c units conditions fig. no. v cc c l = 50 pf, ru = rd = 500 ? (v) min typ max t phl propagation delay bus to bus 4.0 ? 55 0.25 ns v i = open figures 1, 2 t plh (note 6) t pzl output enable time 4.5 ? 5.5 1.8 6.5 ns v i = 7v for t pzl figures 1, 2 t pzh 4.0 1.8 7.3 v i = 0v for t pzh t plz output disable time 4.5 ? 5.5 0.8 4.7 v i = 7v for t plz figures 1, 2 t phz 4.0 0.8 5.3 v i = 0v for t phz t b-m break before make time 4.5 ? 5.5 0.5 ns figure 3 (note 7) 4.0 0.5 symbol parameter typ max units conditions c in control pin input capacitance 2.3 pf v cc = 0v c io-b b port off capacitance 5.7 pf v cc = 5.0v cio-a a port on capacitance 16 pf v cc = 5.0v
www.fairchildsemi.com 4 NC7SB3257 ac loading and waveforms note: input driven by 50 ? source terminated in 50 ? note: c l includes load and stray capacitance note: input prr = 1.0 mhz; t w = 500 ns figure 1. ac test circuit input = ac waveform; prr = variable; duty cycle = 50% figure 2. ac waveforms figure 3. break before make interval timing
5 www.fairchildsemi.com NC7SB3257 tape and reel specification tape format tape dimensions inches (millimeters) package tape number cavity cover tape designator section cavities status status leader (start end) 125 (typ) empty sealed p6x carrier 3000 filled sealed trailer (hub end) 75 (typ) empty sealed package tape size dim a dim b dim f dim k o dim p1 dim w sc70-6 8 mm 0.093 0.096 0.138 0.004 0.053 0.004 0.157 0.315 0.004 (2.35) (2.45) (3.5 0.10) (1.35 0.10) (4) (8 0.1)
www.fairchildsemi.com 6 NC7SB3257 tape and reel specification (continued) reel dimensions inches (millimeters) tape size abcdn w1 w2 w3 8 mm 7.0 0.059 0.512 0.795 2.165 0.331 + 0.059/ ? 0.000 0.567 w1 + 0.078/ ? 0.039 (177.8) (1.50) (13.00) (20.20) (55.00) (8.40 + 1.50/ ? 0.00) (14.40) (w1 + 2.00/ ? 1.00)
7 www.fairchildsemi.com NC7SB3257 tinylogic ? uhs single 2-to-1 multiplexer/demultiplexer bus switch physical dimensions inches (millimeters) unless otherwise noted 6-lead sc70, eiaj sc88, 1.25mm wide package number maa06a fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and fairchild reserves the right at any time without notice to change said circuitry and specifications. life support policy fairchild ? s products are not authorized for use as critical components in life support devices or systems without the express written approval of the president of fairchild semiconductor corporation. as used herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be rea- sonably expected to result in a significant injury to the user. 2. a critical component in any component of a life support device or system whose failure to perform can be rea- sonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com
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