industrial temperature range IDT74LVCH2245A 3.3v cmos octal bus transceiver with 3-state outputs 1 january 2004 industrial temperature range the idt logo is a registered trademark of integrated device technology, inc. ? 2004 integrated device technology, inc. dsc-4937/2 functional block diagram applications: ? 5v and 3.3v mixed voltage systems ? data communication and telecommunication systems drive features: ? balanced output drivers: 12ma (b port) ? high output drivers: 24ma (a port) IDT74LVCH2245A description: this bus transceiver is built using advanced dual metal cmos technol- ogy. the lvch2245a device is designed for asynchronous communica- tion between data buses. the device transmits data from the a bus to the b bus or from the b bus to the a bus, depending on the logic level at the direction-control (dir) input. the output-enable ( oe ) input can be used to disable the device so the buses are effectively isolated. inputs can be driven from either 3.3v or 5v devices. this feature allows the use of this device as a translator in a mixed 3.3v/5v environment. the lvch2245a has series resistors in the output structure of the ?b? port, which will significantly reduce line noise when used with light loads. the driver has been designed to drive 12ma at the designated threshold levels. the "a" port has a 24ma driver. the lvch2245a has ?bus-hold? which retains the inputs' last state whenever the input goes to a high-impedance. this prevents floating inputs and eliminates the need for pull-up/down resistors. 3.3v cmos octal bus transceiver with 3-state outputs, 5 volt tolerant i/o, and bus-hold dir a 1 b 1 oe 1 2 19 18 to seven other channels features: ? 0.5 micron cmos technology ? esd > 2000v per mil-std-883, method 3015; > 200v using machine model (c = 200pf, r = 0) ?v cc = 3.3v 0.3v, normal range ?v cc = 2.7v to 3.6v, extended range ? cmos power levels (0.4 w typ. static) ? rail-to-rail output swing for increased noise margin ? all inputs, outputs, and i/o are 5v tolerant ? supports hot insertion ? available in soic, qsop, and tssop packages
industrial temperature range 2 IDT74LVCH2245A 3.3v cmos octal bus transceiver with 3-state outputs pin configuration note: 1. as applicable to the device type. symbol parameter (1) conditions typ. max. unit c in input capacitance v in = 0v 4.5 6 pf c out output capacitance v out = 0v 5.5 8 pf c i/o i/o port capacitance v in = 0v 6.5 8 pf capacitance (t a = +25c, f = 1.0mhz) symbol description max unit v term terminal voltage with respect to gnd ?0.5 to +6.5 v t stg storage temperature ?65 to +150 c i out dc output current ?50 to +50 ma i ik continuous clamp current, ?50 ma i ok v i < 0 or v o < 0 i cc continuous current through each 100 ma i ss v cc or gnd absolute maximum ratings (1) 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. soic/ qsop/ tssop top view note: 1. h = high voltage level x = don?t care l = low voltage level inputs oe dir outputs l l b data to a bus l h a data to b bus h x isolation function table (1) pin names description oe output enable input (active low) dir direction control output a x side a inputs or 3-state outputs (1) b x side b inputs or 3-state outputs (1) pin description note: 1. these pins have "bus-hold". all other pins are standard inputs, outputs, or i/os. 2 3 1 a 1 v cc 16 15 14 b 4 b 3 b 5 b 1 b 2 11 b 7 b 6 b 8 19 18 20 17 13 12 dir 5 6 a 6 7 a 4 a 5 4 a 2 a 3 8 9 gnd 10 a 7 a 8 oe
industrial temperature range IDT74LVCH2245A 3.3v cmos octal bus transceiver with 3-state outputs 3 symbol parameter test conditions min. typ. (1) max. unit v ih input high voltage level v cc = 2.3v to 2.7v 1.7 ? ? v v cc = 2.7v to 3.6v 2 ? ? v il input low voltage level v cc = 2.3v to 2.7v ? ? 0.7 v v cc = 2.7v to 3.6v ? ? 0.8 i ih input leakage current v cc = 3.6v v i = 0 to 5.5v ? ? 5a i il i ozh high impedance output current v cc = 3.6v v o = 0 to 5.5v ? ? 10 a i ozl (3-state output pins) i off input/output power off leakage v cc = 0v, v in or v o 5.5v ? ? 50 a v ik clamp diode voltage v cc = 2.3v, i in = ?18ma ? ?0.7 ?1.2 v v h input hysteresis v cc = 3.3v ? 100 ? mv i ccl quiescent power supply current v cc = 3.6v v in = gnd or v cc ?? 10a i cch i ccz 3.6 v in 5.5v (2) ?? 10 ? i cc quiescent power supply current one input at v cc - 0.6v, other inputs at v cc or gnd ? ? 500 a variation 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 v cc = 3.3v, +25c ambient. 2. this applies in the disabled state only. bus-hold characteristics symbol parameter (1) test conditions min. typ. (2) max. unit i bhh bus-hold input sustain current v cc = 3v v i = 2v ? 75 ? ? a i bhl v i = 0.8v 75 ? ? i bhh bus-hold input sustain current v cc = 2.3v v i = 1.7v ? ? ? a i bhl v i = 0.7v ? ? ? i bhho bus-hold input overdrive current v cc = 3.6v v i = 0 to 3.6v ? ? 500 a i bhlo notes: 1. pins with bus-hold are identified in the pin description. 2. typical values are at v cc = 3.3v, +25c ambient.
industrial temperature range 4 IDT74LVCH2245A 3.3v cmos octal bus transceiver with 3-state outputs note: 1. v ih and v il must be within the min. or max. range shown in the dc electrical characteristics over operating range table for the appropriat e v cc range. t a = ? 40c to + 85c. output drive characteristics (b port) symbol parameter test conditions (1) min. max. unit v oh output high voltage v cc = 2.3v to 3.6v i oh = ? 0.1ma v cc ? 0.2 ? v v cc = 2.3v i oh = ? 4ma 1.9 ? i oh = ? 6ma 1.7 ? v cc = 2.7v i oh = ? 4ma 2.2 ? i oh = ? 8ma 2 ? v cc = 3v i oh = ? 6ma 2.4 ? i oh = ? 12ma 2 ? v ol output low voltage v cc = 2.3v to 3.6v i ol = 0.1ma ? 0.2 v v cc = 2.3v i ol = 4ma ? 0.4 i ol = 6ma ? 0.55 v cc = 2.7v i ol = 4ma ? 0.4 i ol = 8ma ? 0.6 v cc = 3v i ol = 6ma ? 0.55 i ol = 12ma ? 0.8 note: 1. v ih and v il must be within the min. or max. range shown in the dc electrical characteristics over operating range table for the appropriat e v cc range. t a = ? 40c to + 85c. output drive characteristics (a port) symbol parameter test conditions (1) min. max. unit v oh output high voltage v cc = 2.3v to 3.6v i oh = ? 0.1ma v cc ? 0.2 ? v v cc = 2.3v i oh = ? 6ma 2 ? v cc = 2.3v i oh = ? 12ma 1.7 ? v cc = 2.7v 2.2 ? v cc = 3v 2.4 ? v cc = 3v i oh = ? 24ma 2 ? v ol output low voltage v cc = 2.3v to 3.6v i ol = 0.1ma ? 0.2 v v cc = 2.3v i ol = 6ma ? 0.4 i ol = 12ma ? 0.7 v cc = 2.7v i ol = 12ma ? 0.4 v cc = 3v i ol = 24ma ? 0.55
industrial temperature range IDT74LVCH2245A 3.3v cmos octal bus transceiver with 3-state outputs 5 operating characteristics, v cc = 3.3v 0.3v, t a = 25c symbol parameter test conditions typical unit c pd power dissipation capacitance per transceiver outputs enabled c l = 0pf, f = 10mhz 48 pf c pd power dissipation capacitance per transceiver outputs disabled 4 switching characteristics (b port) (1) v cc = 2.7v v cc = 3.3v 0.3v symbol parameter min. max. min. max. unit t plh propagation delay ? 8.1 1.5 7.1 ns t phl ax to bx t pzh output enable time ? 10 1.5 9 ns t pzl oe to bx t phz output disable time ? 9.2 1.7 8.2 ns t plz oe to bx t sk (o) output skew (2) ?? ? 500 ps notes: 1. see test circuits and waveforms. t a = ? 40c to + 85c. 2. skew between any two outputs of the same package and switching in the same direction. switching characteristics (a port) (1) v cc = 2.7v v cc = 3.3v 0.3v symbol parameter min. max. min. max. unit t plh propagation delay ? 7.3 1.5 6.3 ns t phl bx to ax t pzh output enable time ? 9.5 1.5 8.5 ns t pzl oe to ax t phz output disable time ? 8.5 1.7 7.5 ns t plz oe to ax t sk (o) output skew (2) ?? ? 500 ps notes: 1. see test circuits and waveforms. t a = ? 40c to + 85c. 2. skew between any two outputs of the same package and switching in the same direction.
industrial temperature range 6 IDT74LVCH2245A 3.3v cmos octal bus transceiver with 3-state outputs open v load gnd v cc pulse generator d.u.t. 500 ? 500 ? c l r t v in v out (1, 2) lvc link input v ih 0v v oh v ol t plh1 t sk (x) output 1 output 2 t phl1 t sk (x) t plh2 t phl2 v t v t v oh v t v ol t sk (x) = t plh2 - t plh1 or t phl2 - t phl1 lvc link 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 lvc link data input 0v 0v 0v 0v t rem timing input asynchronous control synchronous control t su t h t su t h v ih v t v ih v t v ih v t v ih v t lvc link low-high-low pulse high-low-high pulse v t t w v t lvc link control input t plz 0v output normally low t pzh 0v switch v load output normally high enable disable switch gnd 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 lvc link test circuits and waveforms propagation delay test circuit for all outputs enable and disable times set-up, hold, and release times notes: 1. for t sk (o) output1 and output2 are any two outputs. 2. for t sk (b) output1 and output2 are in the same bank. 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. output skew - t sk ( x ) pulse width note: 1. diagram shown for input control enable-low and input control disable-high. symbol v cc (1) = 3.3v0.3v v cc (1) = 2.7v v cc (2) = 2.5v0.2v unit v load 6 6 2 x vcc v v ih 2.7 2.7 vcc v v t 1.5 1.5 vcc / 2 v v lz 300 300 150 mv v hz 300 300 150 mv c l 50 50 30 pf test conditions switch position test switch open drain disable low v load enable low disable high gnd enable high all other tests open
industrial temperature range IDT74LVCH2245A 3.3v cmos octal bus transceiver with 3-state outputs 7 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 lvc xxxx xx package device type temp. range so q pg 74 small outline ic (gull wing) quarter size small outline package thin shrink small outline package octal bus transceiver with 3-state outputs, 12ma (b port) ?40c to +85c x bus-hold 2245a bus-hold h 24ma (a port)
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