? 2000 fairchild semiconductor corporation ds500252 www.fairchildsemi.com september 2000 revised september 2000 74LCXZ16244 low voltage 16-bit buffer/line driver with 5v tolerant inputs and outputs 74LCXZ16244 low voltage 16-bit buffer/line driver with 5v tolerant inputs and outputs general description the lcxz16244 contains sixteen non-inverting buffers with 3-state outputs designed to be employed as a mem- ory and address driver, clock driver, or bus oriented trans- mitter/receiver. the device is nibble controlled. each nibble has separate 3-state control inputs which can be shorted together for full 16-bit operation. when v cc is between 0 and 1.5v, the lcxz12644 is in the high impedance state during power up or power down. this places the outputs in high impedance (z) state preventing intermittent low impedance loading or glitching in bus ori- ented applications. the lcxz16244 is designed for low voltage (2.7v or 3.3v) v cc applications with capability of interfacing to a 5v signal environment. the lcxz16244 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 guaranteed power up/down high impedance supports live insertion/withdrawal 2.7v?3.6v v cc specifications provided 4.5 ns t pd max (v cc = 3.0v), 20 a i cc max 24 ma output drive (v cc = 3.0v) implements patented noise/emi reduction circuitry latch-up performance exceeds 500 ma esd performance: human body model > 2000v machine model > 200v ordering code: devices also available in tape and reel. specify by appending the suffix letter ? x ? to the ordering code. connection diagram logic symbol pin descriptions order number package number package description 74LCXZ16244mea ms48a 48-lead small shrink outline package (ssop), jedec mo-118, 0.300 wide 74LCXZ16244mtd mtd48 48-lead thin shrink small outline package (tssop), jedec mo-153, 6.1mm wide pin names description oe n output enable input (active low) i 0 ? i 15 inputs o 0 ? o 15 outputs
www.fairchildsemi.com 2 74LCXZ16244 truth tables h = high voltage level l = low voltage level x = immaterial z = high impedance functional description the lcxz16244 contains sixteen non-inverting buffers with 3-state standard outputs. the device is nibble (4 bits) controlled with each nibble functioning identically, but independent of the other. the control pins can be shorted together to obtain full 16-bit operation. the 3-state outputs are controlled by an output enable (oe n ) input for each nibble. when oe n is low, the outputs are in 2-state mode. when oe n is high, the outputs are in the high impedance mode, but this does not interfere with entering new data into the inputs. logic diagram inputs outputs inputs outputs oe 1 i 0 ?i 3 o 0 ?o 3 oe 3 i 8 ?i 11 o 8 ?o 11 ll l ll l lh h lh h hx z hx z inputs outputs inputs outputs oe 2 i 4 ?i 7 o 4 ?o 7 oe 4 i 12 ?i 15 o 12 ?o 15 ll l ll l lh h lh h hx z hx z
3 www.fairchildsemi.com 74LCXZ16244 absolute maximum ratings (note 1) recommended operating conditions (note 3) note 1: 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 2: i o absolute maximum rating must be observed. note 3: unused inputs must be held high or low. they may not float. dc electrical characteristics note 4: 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 or v cc = 0 ? 1.5v v ? 0.5 to v cc + 0.5 output in high or low state (note 2) 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 or v cc = off 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 output 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/down v o = 0.5v to v cc 0 ? 1.5 5.0 a 3-state output current v i = gnd or v cc 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 4) 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 74LCXZ16244 ac electrical characteristics note 5: 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 data to output 1.0 4.5 1.0 5.2 t pzl output enable time 1.0 5.5 1.0 6.3 ns t pzh 1.05.51.06.3 t plz output disable time 1.0 5.4 1.0 5.7 ns t phz 1.05.41.05.7 t oshl output to output skew (note 5) 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 out 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 74LCXZ16244 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) v i c l 6v for v cc = 3.3v, 2.7v 50 pf v cc * 2 for v cc = 2.5v 30 pf 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 74LCXZ16244 schematic diagram generic for lcx family
7 www.fairchildsemi.com 74LCXZ16244 physical dimensions inches (millimeters) unless otherwise noted 48-lead small shrink outline package (ssop), jedec mo-118, 0.300 wide package number ms48a
www.fairchildsemi.com 8 74LCXZ16244 low voltage 16-bit buffer/line driver with 5v tolerant inputs and outputs physical dimensions inches (millimeters) unless otherwise noted (continued) 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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