? 2003 fairchild semiconductor corporation ds500580 www.fairchildsemi.com march 2002 revised december 2003 74lcxz16245 low voltage 16-bit bidirectional transceiver with 5v tolerant inputs and outputs 74lcxz16245 low voltage 16-bit bidirectional transceiver with 5v tolerant inputs and outputs general description the lcxz16245 contains sixteen non-inverting bidirec- tional buffers with 3-state outputs and is intended for bus oriented applications. the device is designed for low volt- age (2.7v or 3.3v) v cc applications with capability of inter- facing to a 5v signal environment. the device is byte controlled. each byte has separate control inputs which could be shorted together for full 16-bit operation. the t/r inputs determine the direction of data flow through the device. the oe inputs disable both the a and b ports by placing them in a high impedance state. when v cc is between 0v and 1.5v, the lcxz16245 is on the high impedance state during power-up or power-down. this places the outputs in the high impedance (z) state preventing intermittent low impedance loading or glitching in bus oriented applications. the lcxz16245 is fabricated with an advanced cmos technology to achieve high speed operation while maintain- ing cmos low power dissipation. features 5v tolerant inputs and outputs 2.7v?3.6v v cc specifications provided 4.5 ns t pd max (v cc = 3.3v), 20 a i cc max power-down high impedance inputs and outputs supports live insertion/withdrawal (note 1) 24 ma output drive (v cc = 3.0v) implements patented noise/emi reduction circuitry latch-up performance conforms to the requirements of jesd78 esd performance: human body model > 2000v machine model > 200v note 1: to ensure the high-impedance state during power up or down, oe should be tied to v cc through a pull-up resistor: the minimum value or the resistor is determined by the current-sourcing capability of the driver. ordering code: devices also available in tape and reel. specify by appending the suffix letter ? x ? to the ordering code. logic symbol order number package number package description 74lcxz16245mtd mtd48 48-lead thin shrink small outline package (tssop), jedec mo-153, 6.1mm wide
www.fairchildsemi.com 2 74lcxz16245 connection diagram pin assignment for ssop and tssop pin descriptions truth tables h = high voltage level l = low voltage level x = immaterial z = high impedance logic diagram pin names description oe n output enable input t/r n transmit/receive input a 0 ? a 15 side a inputs or 3-state outputs b 0 ? b 15 side b inputs or 3-state outputs nc no connect inputs outputs oe 1 t/r 1 llbus b 0 ? b 7 data to bus a 0 ? a 7 lhbus a 0 ? a 7 data to bus b 0 ? b 7 h x high z state on a 0 ? a 7 , b 0 ? b 7 inputs outputs oe 2 t/r 2 l l bus b 8 ? b 15 data to bus a 8 ? a 15 l h bus a 8 ? a 15 data to bus b 8 ? b 15 h x high z state on a 8 ? a 15 , b 8 ? b 15
3 www.fairchildsemi.com 74lcxz16245 absolute maximum ratings (note 2) recommended operating conditions (note 4) note 2: the absolute maximum ratings are those values beyond which the safety of the device cannot be guaranteed. the device should not be operated at these limits. the parametric values defined in the electrical characteristics tables are not guaranteed at the absolute maxi mum ratings. the ? recom- mended operating conditions ? table will define the conditions for actual device operation. note 3: i o absolute maximum rating must be observed. note 4: unused inputs or i/o's must be held high or low. they may not float. dc electrical characteristics note 5: outputs disabled or 3-state only. symbol parameter value conditions units v cc supply voltage ? 0.5 to + 7.0 v v i dc input voltage ? 0.5 to + 7.0 v v o dc output voltage ? 0.5 to + 7.0 output in 3-state v ? 0.5 to v cc + 0.5 output in high or low state (note 3) i ik dc input diode current ? 50 v i < gnd ma i ok dc output diode current ? 50 v o < gnd ma + 50 v o > v cc i o dc output source/sink current 50 ma i cc dc supply current per supply pin 100 ma i gnd dc ground current per ground pin 100 ma t stg storage temperature ? 65 to + 150 c symbol parameter min max units v cc supply voltage operating 2.7 3.6 v v i input voltage 05.5v v o output voltage high or low state 0 v cc v 3-state 0 5.5 i oh /i ol output current v cc = 3.0v ? 3.6v 24 ma v cc = 2.7v ? 3.0v 12 t a free-air operating temperature ? 40 85 c ? t/ ? v input edge rate, v in = 0.8v ? 2.0v, v cc = 3.0v 0 10 ns/v symbol parameter conditions v cc t a = ? 40 c to + 85 c units (v) min max v ih high level input voltage 2.7 ? 3.6 2.0 v v il low level input voltage 2.7 ? 3.6 0.8 v v oh high level output voltage i oh = ? 100 a2.7 ? 3.6 v cc ? 0.2 v i oh = ? 12 ma 2.7 2.2 i oh = ? 18 ma 3.0 2.4 i oh = ? 24 ma 3.0 2.2 v ol low level output voltage i ol = 100 a2.7 ? 3.6 0.2 v i ol = 12 ma 2.7 0.4 i ol = 16 ma 3.0 0.4 i ol = 24 ma 3.0 0.55 i i input leakage current 0 v i 5.5v 2.7 ? 3.6 5.0 a i oz 3-state i/o leakage 0 v o 5.5v 2.7 ? 3.6 5.0 a v i = v ih or v il i off power-off leakage current v i or v o = 5.5v 0 10 a i pu/pd power-up/power-down v o = 0.5v to v cc 0 - 1.5 5.0 a 3-state output current v i = v cc or gnd i cc quiescent supply current v i = v cc or gnd 2.7 ? 3.6 225 a 3.6v v i , v o 5.5v (note 5) 2.7 ? 3.6 225 ? i cc increase in i cc per input v ih = v cc ? 0.6v 2.7 ? 3.6 500 a
www.fairchildsemi.com 4 74lcxz16245 ac electrical characteristics note 6: skew is defined as the absolute value of the difference between the actual propagation delay for any two separate outputs of th e same device. the specification applies to any outputs switching in the same direction, either high-to-low (t oshl ) or low-to-high (t oslh ). parameter guaranteed by design. dynamic switching characteristics capacitance symbol parameter t a = ? 40 c to + 85 c, r l = 500 ? units v cc = 3.3v 0.3v v cc = 2.7v c l = 50 pf c l = 50 pf min max min max t phl propagation delay 1.0 4.5 1.0 5.2 ns t plh a n to b n or b n to a n 1.0 4.5 1.0 5.2 t pzl output enable time 1.0 6.5 1.0 7.2 ns t pzh 1.0 6.5 1.0 7.2 t plz output disable time 1.0 6.4 1.0 6.9 ns t phz 1.0 6.4 1.0 6.9 t oshl output to output skew (note 6) 1.0 ns t oslh 1.0 symbol parameter conditions v cc t a = 25 c units (v) typical v olp quiet output dynamic peak v ol c l = 50 pf, v ih = 3.3v, v il = 0v 3.3 0.8 v v olv quiet output dynamic valley v ol c l = 50 pf, v ih = 3.3v, v il = 0v 3.3 ? 0.8 v symbol parameter conditions typical units c in input capacitance v cc = open, v i = 0v or v cc 7pf c i/o input/output capacitance v cc = 3.3v, v i = 0v or v cc 8pf c pd power dissipation capacitance v cc = 3.3v, v i = 0v or v cc , f = 10 mhz 20 pf
5 www.fairchildsemi.com 74lcxz16245 ac loading and waveforms generic for lcx family figure 1. ac test circuit (c l includes probe and jig capacitance) waveform for inverting and non-inverting functions propagation delay. pulse width and t rec waveforms 3-state output low enable and disable times for logic 3-state output high enable and disable times for logic setup time, hold time and recovery time for logic t rise and t fall figure 2. waveforms (input characteristics; f =1mhz, t r = t f = 3ns) test switch t plh , t phl open t pzl , t plz 6v at v cc = 3.3 0.3v, and 2.7v t pzh , t phz gnd symbol v cc 3.3v 0.3v 2.7v v mi 1.5v 1.5v v mo 1.5v 1.5v v x v ol + 0.3v v ol + 0.3v v y v oh ? 0.3v v oh ? 0.3v
www.fairchildsemi.com 6 74lcxz16245 schematic diagram generic for lcx family
7 www.fairchildsemi.com 74lcxz16245 low voltage 16-bit bidirectional transceiver with 5v tolerant inputs and outputs physical dimensions inches (millimeters) unless otherwise noted 48-lead thin shrink small outline package (tssop), jedec mo-153, 6.1mm wide package number mtd48 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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