74LVQ244 low voltage octal bus buffer with 3 state outputs (non-inverted) february 1997 order codes : 74LVQ244m 74LVQ244t m (micro package) n high speed: t pd = 6 ns (typ.) at v cc =3.3v n input & output ttl compatible levels n low power dissipation: i cc =4 m a (max.) at t a =25 o c n low noise: v olp = 0.4v (typ.) at v cc =3.3v n 75 w transmission line output drive capability n symmetrical output impedance: |i oh |=i ol =12ma(min) n pci bus levels guaranteed at 24ma n balanced propagation delays: t plh @ t phl n operating voltage range: v cc (opr) = 2v to 3.6v (1.2v data retention) n pin and function compatible with 74 series 244 n improved latch-up immunity description the lvq244 is a low voltage cmos octal bus buffer fabricated with sub-micron silicon gate and double-layer metal wiring c 2 mos t (tssop package) technology. it is ideal for low power and low noise 3.3v applications. it has better speed performance at 3.3v than 5v lsttl family combined with the true cmos low power consumption. g control output governs four bus buffers. this device is designed to be used with 3 state memory address drivers, etc. all inputs and outputs are equipped with protection circuits against static discharge, giving them 2kv esd immunity and transient excess voltage. pin connection and iec logic symbols 1/8
input and output equivalent circuit truth table input out put ganyn lll lhh hxz x: oho or olo z: high impedance absolute maximum rating symbol parameter value unit v cc supply voltage -0.5 to +7 v v i dc input voltage -0.5 to v cc +0.5 v v o dc output voltage -0.5 to v cc +0.5 v i ik dc input diode current 20 ma i ok dc output diode current 20 ma i o dc output current 50 ma i cc or i gnd dc v cc or ground current 400 ma t stg storage temperature -65 to +150 o c t l lead temperature (10 sec) 300 o c absolute maximum ratings are those values beyond which damage to the device may occur. functional operation under these condition is not implied. recommended operating conditions symbol parameter value unit v cc supply voltage (note 1) 2 to 3.6 v v i input voltage 0 to v cc v v o output voltage 0 to v cc v t op operating temperature: -40 to +85 o c dt/dv input rise and fall time (v cc = 3v) (note 2) 0 to 10 ns/v 1) truth table guaranteed: 1.2v to 3.6v pin description pin no symbol name and function 1 1g output enable input 2, 4, 6, 8 1a1 to 1a4 data inputs 9, 7, 5, 3 2y1 to 2y4 data outputs 11, 13, 15, 17 2a1 to 2a4 data inputs 18, 16, 14, 12 1y1 to 1y4 data outputs 19 2g output enabel input 10 gnd ground (0v) 20 v cc positive supply voltage 74LVQ244 2/8
dc specifications symbol parameter test conditions value unit v cc (v) t a =25 o c-40to85 o c min. typ. max. min. max. v ih high level input voltage 3.0to3.6 2.0 2.0 v v il low level input voltage 0.8 0.8 v v oh high level output voltage 3.0 v i (*) = v ih or v il i o =-50 m a 2.9 2.99 2.9 v i o =-12 ma 2.58 2.48 i o =-24 ma 2.2 v ol low level output voltage 3.0 v i (*) = v ih or v il i o =50 m a0.0020.1 0.1 v i o =12 ma 0 0.36 0.44 i o =24 ma 0.55 i i input leakage current 3.6 v i =v cc or gnd 0.1 1 m a i oz 3 state output leakage current 3.6 v i =v ih or v il v o =v cc or gnd 0.5 5 m a i cc quiescent supply current 3.6 v i =v cc or gnd 4 40 m a i old dynamic output current (note 1, 2) 3.6 v old =0.8vmax 36 ma i ohd v ohd = 2 v min -25 ma 1) maximum test duration 2ms, one output loaded at time 2) incident wave switching is guaranteed on transmission lines with impedances as low as 50 w . dynamic switching characteristics symbol parameter test conditions value unit v cc (v) t a =25 o c-40to85 o c min. typ. max. min. max. v olp dynamic low voltage quiet output (note 1, 2) 3.3 c l =50pf 0.4 0.8 v v olv -0.8 -0.5 v ihd dynamic high voltage input (note 1, 3) 3.3 2 v ild dynamic low voltage input (note 1, 3) 3.3 0.8 1) worst case package 2) max number of outputs defined as (n). data inputs are driven 0v to 3.3v, (n -1) outputs switching and one output at gnd 3) max number of data inputs (n) switching. (n-1) switching 0v to 3.3v. inputs under test switching: 3.3v to threshold (v ild ), 0v to threshold (v ihd ). f=1mhz 74LVQ244 3/8
capacitive characteristics symbol parameter test conditions value unit v cc (v) t a =25 o c-40to85 o c min. typ. max. min. max. c in input capacitance 3.3 5 pf c out output capacitance 3.3 10 pf c pd power dissipation capacitance (note 1) 3.3 f in = 10 mhz 15 pf 1) c pd is defined as the value of the ic's internal equivalent capacitance which is calculated from the operating current consumption without load. (refer to test circuit). average operting current can be obtained by the following equation. i cc (opr) = c pd ? v cc ? f in +i cc /n (per circuit) test circuit test switch t plh ,t phl open t pzl ,t plz 2v cc t pzh ,t phz gnd c l = 50 pf or equivalent (includes jig and probe capacitance) r l =r 1 = 500 w or equivalent r t =z out of pulse generator (typically 50 w ) ac electrical characteristics (c l = 50 pf, r l = 500 w , input t r =t f =3 ns) symbol parameter test condition value unit v cc (v) t a =25 o c-40to85 o c min. typ. max. min. max. t plh t phl propagation delay time 2.7 7 13 14 ns 3.3 (*) 69 9.5 t pzl t pzh output enable time 2.7 8.5 17 18 ns 3.3 (*) 7 12 12.5 t plz t phz output disable time 2.7 9 19 20 ns 3.3 (*) 7.5 13.5 14 t oslz t oshl output to output skew time (note 1, 2) 2.7 0.5 1.5 1.5 ns 3.3 (*) 0.5 1.5 1.5 1) skew is defined as the absolute value of the difference between the actual propagation delay for any two outputs of the same device switching in the same direction, either high or low 2) parameter guaranteed by design (*) voltage range is 3.3v 0.3v 74LVQ244 4/8
waveform 1: propagation delays (f=1mhz; 50% duty cicle) waveform 2: output enable and disable time (f=1mhz; 50% duty cicle) 74LVQ244 5/8
so20 mechanical data dim. mm inch min. typ. max. min. typ. max. a 2.65 0.104 a1 0.10 0.20 0.004 0.007 a2 2.45 0.096 b 0.35 0.49 0.013 0.019 b1 0.23 0.32 0.009 0.012 c 0.50 0.020 c1 45 (typ.) d 12.60 13.00 0.496 0.512 e 10.00 10.65 0.393 0.419 e 1.27 0.050 e3 11.43 0.450 f 7.40 7.60 0.291 0.299 l 0.50 1.27 0.19 0.050 m 0.75 0.029 s8 (max.) p013l 74LVQ244 6/8
dim. mm inch min. typ. max. min. typ. max. a 1.1 0.433 a1 0.05 0.10 0.15 0.002 0.004 0.006 a2 0.85 0.9 0.95 0.335 0.354 0.374 b 0.19 0.30 0.0075 0.0118 c 0.09 0.2 0.0035 0.0079 d 6.4 6.5 6.6 0.252 0.256 0.260 e 6.25 6.4 6.5 0.246 0.252 0.256 e1 4.3 4.4 4.48 0.169 0.173 0.176 e 0.65 bsc 0.0256 bsc k0 o 4 o 8 o 0 o 4 o 8 o l 0.50 0.60 0.70 0.020 0.024 0.028 c e b a2 a e1 d 1 pin 1 identification a1 l k e tssop20 mechanical data 74LVQ244 7/8
information furnished is believed to be accurate and reliable. however, sgs-thomson microelectronics assumes no responsability for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may results from its use. no license is granted by implication or otherwise under any patent or patent rights of sgs-thomson microelectronics. specifications mentioned in this publication are subject to change without notice. this publication supersede s and replaces all information previously supplied. sgs-thomson microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of sgs-thomson microelectonics. ? 1997 sgs-thomson microelectronics - printed in italy - all rights reserved sgs-thomson microelectronics group of companies australia - brazil - canada - china - france - germany - hong kong - italy - japan - korea - malaysia - malta - morocco - the netherlands - singapore - spain - sweden - switzerland - taiwan - thailand - united kingdom - u.s.a . 74LVQ244 8/8
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