1 industrial temperature range idt74cbtlvr3861 low-voltage 10-bit bus switch august 2002 2002 integrated device technology, inc. dsc-5392/10 c industrial temperature range applications: ? 3.3v high speed bus switching and bus isolation features: ? isolation under power-off conditions ? over-voltage tolerant ? latch-up performance exceeds 100ma ?v cc = 2.3v - 3.6v, normal range ? esd >2000v per mil-std-883, method 3015; >200v using machine model (c = 200pf, r = 0) ? available in ssop, qsop, and tssop packages the idt logo is a registered trademark of integrated device technology, inc. idt74cbtlvr3861 functional block diagram simplified schematic, each switch low-voltage 10-bit bus switch description: the cbtlvr3861 is a ten bit high-speed bus switch. it adds an internal series resistor with each switch to reduce reflection noise in high-speed applications. when closed, the switch acts as a source (series) termination for the driver connected to it. the device is organized as one 10-bit bus switch. when output enable ( oe ) is low, the 10-bit bus switch is on and port a is connected to port b. when oe is high, the switch is open and a high-impedance state exists between the two ports. to ensure the high-impedance state during power up or power down, oe should be tied to v cc through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver. 2 11 23 a1 a10 oe sw sw b10 b1 22 13 oe ab
2 industrial temperature range idt74cbtlvr3861 low-voltage 10-bit bus switch absolute maximum ratings (1) symbol description max. unit v cc supply voltage range ?0.5 to 4.6 v v i input voltage range ?0.5 to 4.6 v continuous channel current 128 ma i ik input clamp current, v i/o < 0 ?50 ma t stg storage temperature range ?65 to +150 c note: 1. stresses greater than those listed under absolute maximum ratings may cause permanent damage to the device. this is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect reliability. pin configuration operating characteristics (1) symbol parameter test conditions min. max. unit v cc supply voltage 2.3 3.6 v v ih high-level control input voltage v cc = 2.3v to 2.7v 1.7 ? v v cc = 2.7v to 3.6v 2 ? v il low-level control input voltage v cc = 2.3v to 2.7v ? 0.7 v v cc = 2.7v to 3.6v ? 0.8 t a operating free-air temperature ?40 +85 c note: 1. all unused control inputs of the device must be held at v cc or gnd to ensure proper device operation. ssop/ qsop/ tssop top view note: 1. h = high voltage level l = low voltage level function table (1) input oe function l a port = b port h disconnect a 10 11 b 9 14 a 9 10 b 8 15 gnd 12 b 10 13 v cc 24 1 nc oe a 1 223 b 1 a 2 322 b 2 a 3 421 b 3 a 4 520 b 4 a 5 6 19 b 5 a 6 718 b 6 a 7 817 b 7 a 8 916
3 industrial temperature range idt74cbtlvr3861 low-voltage 10-bit bus switch dc electrical characteristics over operating range following conditions apply unless otherwise specified: operating condition: t a = ?40c to +85c notes: 1. typical values are at 3.3v, +25 c ambient. 2. the increase in supply current is attributable to each input that is at the specified voltage level rather than v cc or gnd. 3. this is measured by the voltage drop between the a and b terminals at the indicated current through the switch. on-state resi stance is determined by the lower of the voltages of the two (a or b) terminals. symbol parameter test conditions min. typ. (1) max. unit v ik control inputs, data i/o v cc = 3v, i i = ?18ma ? ? ?1.2 v i i control inputs v cc = 3.6v, v i = v cc or gnd ? ? 1 a i oz data i/o v cc = 3.6v, v o = 0v or 3.6v switch disabled ? ? 5 a i off v cc = 0v, v i or v o = 0v to 3.6v ? ? 10 a i cc v cc = 3.6v, i o = 0, v i = v cc or gnd ? ? 10 a ? i cc (2) control inputs v cc = 3.6v, one input at 3v, other inputs at v cc or gnd ? ? 300 a c i control inputs v i = 3v or 0 ? 4 ? pf c io(off) v o = 3v or 0, oe = v cc ?8?pf v cc = 2.3v v i = 0 i o = 64ma ? 30 47 typ. at v cc = 2.5v i o = 24ma ? 30 47 r on (3) v i = 1.7v i o = 15ma ? 36 80 ? v i = 0 i o = 64ma ? 30 42 v cc = 3v i o = 24ma ? 30 42 v i = 2.4v i o = 15ma ? 32 47 v cc = 2.5v 0.2v v cc = 3.3v 0.3v symbol parameter min. max. min. max. unit t pd (1) propagation delay ? 0.9 ? 1.5 ns a to b or b to a t en output enable time 1 6 1 5.3 ns oe to a or b t dis output disabletime 1 5.5 1 5.5 ns oe to a or b note: 1. the propagation delay is the calculated rc time constant of the typical on-state resistance of the switch and the specified l oad capacitance when driven by an ideal voltage source (zero output impededance). switching characteristics
4 industrial temperature range idt74cbtlvr3861 low-voltage 10-bit bus switch open v load gnd v cc pulse generator d.u.t. 500 ? 500 ? c l r t v in v out (1, 2) same phase input transition opposite phase input transition 0v 0v v oh v ol t plh t phl t phl t plh output v ih v t v t v ih v t control input t plz 0v output normally low t pzh 0v switch closed output normally high enable disable switch open t phz 0v v ol + v lz v oh v t v t t pzl v load/2 v load/2 v ih v t v ol v oh - v hz test circuits and waveforms propagation delay test circuits for all outputs enable and disable times note: 1. diagram shown for input control enable-low and input control disable-high. definitions: c l = load capacitance: includes jig and probe capacitance. r t = termination resistance: should be equal to z out of the pulse generator. notes: 1. pulse generator for all pulses: rate 10mhz; t f 2.5ns; t r 2.5ns. 2. pulse generator for all pulses: rate 10mhz; t f 2ns; t r 2ns. test switch t plz /t pzl v load t phz /t pzh gnd t pd open switch position symbol v cc (1) = 3.3v0.3v v cc (2) = 2.5v0.2v unit v load 6 2 x vcc v v ih 3 vcc v v t 1.5 vcc / 2 v v lz 300 150 mv v hz 300 150 mv c l 50 30 pf test conditions
5 industrial temperature range idt74cbtlvr3861 low-voltage 10-bit bus switch ordering information corporate headquarters for sales: for tech support: 2975 stender way 800-345-7015 or 408-727-6116 logichelp@idt.com santa clara, ca 95054 fax: 408-492-8674 (408) 654-6459 www.idt.com idt xx cbtlv xxx xx package device type temp. range py q pg 74 shrink small outline package quarter-size small outline package thin shrink small outline package low-voltage 10-bit bus switch ?40c to +85c 3861 family x 25 ? series dampening resistors on a and b ports r
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