1 industrial temperature range idt74cbtlv16212 low-voltage 24-bit bus exchange switch august 2002 2002 integrated device technology, inc. dsc-5889/5 c industrial temperature range applications: ? 3.3v high speed bus switching and bus isolation features: ?5 ? ? ? ? ? a/b bi-directional switch ? 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, tssop, and tvsop packages the idt logo is a registered trademark of integrated device technology, inc. idt74cbtlv16212 functional block diagram simplified schematic, each switch low-voltage 24-bit bus exchange switch description: the cbtlv16212 provides a set of 24 high-speed switches for bus exchanging and switching. the device has low on resistance, resulting in under 250ps propagation delay through the switch. the cbtlv16212 operates as a single 24-bit bus switch or as a 12-bit bus exchanger, which provides data exchanging between the four signal ports through the data select (s 0 -s 2 ) pins. the cbtlv16212 has the break-before-make feature, which allows zero current when switching between ports b1 and b2. sw sw sw sw sw sw sw sw s 0 s 1 s 2 1 56 55 1 a 1 1 a 2 12 a 1 12 a 2 2 3 27 28 1 b 1 1 b 2 12 b 1 12 b 2 54 53 30 29 flow control circuitry ab
2 industrial temperature range idt74cbtlv16212 low-voltage 24-bit bus exchange 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/ tssop/ tvsop top view 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 s1 s2 1b1 1b2 2b1 2b2 3b1 gnd 3b2 4b1 4b2 5b1 5b2 6b1 6b2 7b1 7b2 8b1 gnd 8b2 9b1 9b2 10b1 10b2 11b1 11b2 12b1 12b2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 s0 1a1 1a2 2a1 2a2 3a1 3a2 gnd 4a1 4a2 5a1 5a2 6a1 6a2 7a1 7a2 v cc 8a1 gnd 8a2 9a1 9a2 10a1 10a2 11a1 11a2 12a1 12a2 note: 1. h = high voltage level l = low voltage level z = high-impedance function table (1) pin names description s x data select x a x port a inputs or outputs x b x port b inputs or outputs pin description inputs inputs/outputs s 2 s 1 s 0 a 1 a 2 operation l l l z z disconnect ll h b 1 za 1 port = b 1 port lh l b 2 za 1 port = b 2 port lh h z b 1 a 2 port = b 1 port hllzb 2 a 2 port = b 2 port h l h z z disconnect hh l b 1 b 2 a 1 port = b 1 port a 2 port = b 2 port hh h b 2 b 1 a 1 port = b 2 port a 2 port = b 1 port
3 industrial temperature range idt74cbtlv16212 low-voltage 24-bit bus exchange 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. 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 or 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 ? 5 ? pf c io(off) v o = 3v or 0 (switch off) ? 13.5 ? pf max. at v cc = 2.3v v i = 0 i o = 64ma ? 5 8 typ. at v cc = 2.5v i o = 24ma ? 5 8 r on (3) v i = 1.7v i o = 15ma ? 27 40 ? v i = 0 i o = 64ma ? 5 7 v cc = 3v i o = 24ma ? 5 7 v i = 2.4v i o = 15ma ? 10 15 v cc = 2.5v 0.2v v cc = 3.3v 0.3v symbol parameter min. max. min. max. unit t pd (1) propagation delay ? 0.15 ? 0.25 ns a to b or b to a t pd propagation delay 3 11.1 3 8.8 ns s to a or b t en output enable time 3 10.9 3 8.6 ns s to a or b t dis output disabletime 1 8.7 2 8.8 ns s 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 idt74cbtlv16212 low-voltage 24-bit bus exchange 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 idt74cbtlv16212 low-voltage 24-bit bus exchange 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 pv pa pag pf 74 shrink small outline package thin shrink small outline package tssop - green thin very small outline package low-voltage 24-bit bus exchange switch ?40c to +85c 16212
|
