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1/12 july 2004 5v tolerant inputs high speed: t pd = 4.8ns (max.) at v cc = 3v power down protection on inputs and outputs symmetrical output impedance: |i oh | = i ol = 24ma (min) at v cc = 3v pci bus levels guaranteed at 24 ma balanced propagation delays: t plh ? t phl operating voltage range: v cc (opr) = 1.65v to 3.6v (1.2v data retention) pin and function compatible with 74 series 126 latch-up performance exceeds 500ma (jesd 17) esd performance: hbm > 2000v (mil std 883 method 3015); mm > 200v description the 74lvc126a is a low voltage cmos quad bus buffer fabricated with sub-micron silicon gate and double-layer metal wiring c 2 mos technology. it is ideal for 1.65v to 3.6v v cc operations and low power and low noise applications. it can be interfaced to 5v signal environment for inputs in mixed 3.3/5v system. the device requires the 3-state control input g to be set low to place the output go in to the high impedance state. it has more speed performance at 3.3v than 5v ac/act family, combined with a lower power consumption. all inputs and outputs are equipped with protection circuits against static discharge, giving them esd immunity and transient excess voltage. 74lvc126a low voltage cmos quad bus buffers (3-state) high performance figure 1: pin connection and iec logic symbols table 1: order codes package t & r sop 74lvc126amtr tssop 74LVC126ATTR tssop sop rev. 2
74lvc126a 2/12 figure 2: input and output equivalent circuit table 2: pin description table 3: truth table x : don?t care z : high impedance table 4: absolute maximum ratings absolute maximum ratings are those values beyond which damage to the device may occur. functional operation under these conditi ons is not implied 1) i o absolute maximum rating must be observed 2) v o < gnd pin n symbol name and function 1, 4, 10, 13 g1 to g4 output enable inputs 2, 5, 9, 12 a1 to a4 data inputs 3, 6, 8, 11 y1 to y4 data outputs 7 gnd ground (0v) 14 v cc positive supply voltage agy xlz lhl hhh symbol parameter value unit 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 (high impedance or v cc = 0v) -0.5 to +7.0 v v o dc output voltage (high or low state) (note 1) -0.5 to v cc + 0.5 v i ik dc input diode current - 50 ma i ok dc output diode current (note 2) - 50 ma i o dc output current 50 ma i cc or i gnd dc v cc or ground current per supply pin 100 ma t stg storage temperature -65 to +150 c t l lead temperature (10 sec) 300 c
74lvc126a 3/12 table 5: recommended operating conditions 1) truth table guaranteed: 1.2v to 3.6v 2) v i from 0.8v to 2v at v cc = 3.0v table 6: dc specifications symbol parameter value unit v cc supply voltage (note 1) 1.65 to 3.6 v v i input voltage 0 to 5.5 v v o output voltage (high impedance or v cc = 0v) 0 to 5.5 v v o output voltage (high or low state) 0 to v cc v i oh , i ol high or low level output current (v cc = 3.0 to 3.6v) 24 ma i oh , i ol high or low level output current (v cc = 2.7 to 3.0v) 12 ma i oh , i ol high or low level output current (v cc = 2.3 to 2.7v) 8ma i oh , i ol high or low level output current (v cc = 1.65 to 2.3v) 4ma t op operating temperature -55 to 125 c dt/dv input rise and fall time (note 2) 0 to 10 ns/v symbol parameter test condition value unit v cc (v) -40 to 85 c -55 to 125 c min. max. min. max. v ih high level input voltage 1.65 to 1.95 0.65v cc 0.65v cc v 2.3 to 2.7 1.7 1.7 2.7 to 3.6 2 2 v il low level input voltage 1.65 to 1.95 0.35v cc 0.35v cc v 2.3 to 2.7 0.7 0.7 2.7 to 3.6 0.8 0.8 v oh high level output voltage 1.65 to 3.6 i o =-100 av cc -0.2 v cc -0.2 v 1.65 i o =-4 ma 1.2 1.2 2.3 i o =-8 ma 1.7 1.7 2.7 i o =-12 ma 2.2 2.2 3.0 i o =-18 ma 2.4 2.4 3.0 i o =-24 ma 2.2 2.2 v ol low level output voltage 1.65 to 3.6 i o =100 a 0.2 0.2 v 1.65 i o =4 ma 0.45 0.45 2.3 i o =8 ma 0.7 0.7 2.7 i o =12 ma 0.4 0.4 3.0 i o =24 ma 0.55 0.55 i i input leakage current 3.6 v i = 0 to 5.5v 5 5 a i off power off leakage current 0 v i or v o = 5.5v 10 10 a i oz high impedance output leakage current 3.6 v i = v ih or v il v o = 0 to 5.5v 5 5 a i cc quiescent supply current 3.6 v i = v cc or gnd 10 10 a v i or v o = 3.6 to 5.5v 10 10 ? i cc i cc incr. per input 2.7 to 3.6 v ih = v cc -0.6v 500 500 a
74lvc126a 4/12 table 7: dynamic switching characteristics 1) number of output defined as "n". measured with "n-1" outputs switching from high to low or low to high. the remaining output is measured in the low state. table 8: ac electrical characteristics 1) skew is defined as the absolute value of the difference between the actual propagation delay for any two outputs of the same device switch- ing in the same direction, either high or low (t oslh = | t plhm - t plhn |, t oshl = | t phlm - t phln | 2) parameter guaranteed by design table 9: capacitive characteristics 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 operating current can be obtained by the following equation. i cc(opr) = c pd x v cc x f in + i cc /4 (per circuit) symbol parameter test condition value unit v cc (v) t a = 25 c min. typ. max. v olp dynamic low level quiet output (note 1) 3.3 c l = 50pf v il = 0v, v ih = 3.3v 0.8 v v olv -0.8 symbol parameter test condition value unit v cc (v) c l (pf) r l ( ? ) t s = t r (ns) -40 to 85 c -55 to 125 c min. max. min. max. t plh t phl propagation delay time 1.65 to 1.95 30 1000 2.0 9.0 12 ns 2.3 to 2.7 30 500 2.0 6.3 8.5 2.7 50 500 2.5 1.5 5.5 6.5 3.0 to 3.6 50 500 2.5 1 4.8 5.8 t pzl t pzh output enable time 1.65 to 1.95 30 1000 2.0 10 13 ns 2.3 to 2.7 30 500 2.0 8.3 10.8 2.7 50 500 2.5 1 6.3 7.6 3.0 to 3.6 50 500 2.5 1 5.7 6.8 t plz t phz output disable time 1.65 to 1.95 30 1000 2.0 12.6 16.4 ns 2.3 to 2.7 30 500 2.0 8.7 11.3 2.7 50 500 2.5 2 6.7 8.0 3.0 to 3.6 50 500 2.5 2 6 7.2 t oslh t oshl output to output skew time (note1, 2) 2.7 to 3.6 1 1 ns symbol parameter test condition value unit v cc (v) t a = 25 c min. typ. max. c in input capacitance 4pf c pd power dissipation capacitance (note 1) 1.8 f in = 10mhz 28 pf 2.5 30 3.3 34
74lvc126a 5/12 figure 3: test circuit c l = 30pf or equivalent (includes jig and probe capacitance) r l = r 1 = 500 ? or equivalent r t = z out of pulse generator (typically 50 ? ) table 10: test circuit and waveform symbol value test switch t plh , t phl open t pzl , t plz (v cc = 3.0 to 3.6v) 6v t pzl , t plz (v cc = 2.3 to 2.7v or v cc = 1.65 to 1.95v) 2v cc t pzh , t phz gnd symbol v cc 1.65 to 1.95v 2.3 to 2.7v 2.7v 3.0 to 3.6v c l 30pf 30pf 50pf 50pf r l = r 1 1000 ? 500 ? 500 ? 500 ? v s 2 x v cc 2 x v cc 6v 6v v ih v cc v cc 2.7v 2.7v v m v cc /2 v cc /2 1.5v 1.5v v oh v cc v cc 3.0v 3.0v v x v ol + 0.15v v ol + 0.15v v ol + 0.3v v ol + 0.3v v y v oh - 0.15v v oh - 0.15v v oh - 0.3v v oh - 0.3v t r = t r <2.0ns <2.0ns <2.5ns <2.5ns
74lvc126a 6/12 figure 4: waveform - propagation delays (f=1mhz; 50% duty cycle) figure 5: waveform - output enable and disable time (f=1mhz; 50% duty cycle)
74lvc126a 7/12 dim. mm. inch min. typ max. min. typ. max. a 1.35 1.75 0.053 0.069 a1 0.1 0.25 0.004 0.010 a2 1.10 1.65 0.043 0.065 b 0.33 0.51 0.013 0.020 c 0.19 0.25 0.007 0.010 d 8.55 8.75 0.337 0.344 e 3.8 4.0 0.150 0.157 e 1.27 0.050 h 5.8 6.2 0.228 0.244 h 0.25 0.50 0.010 0.020 l 0.4 1.27 0.016 0.050 k0 8 0 8 ddd 0.100 0.004 so-14 mechanical data 0016019d
74lvc126a 8/12 dim. mm. inch min. typ max. min. typ. max. a 1.2 0.047 a1 0.05 0.15 0.002 0.004 0.006 a2 0.8 1 1.05 0.031 0.039 0.041 b 0.19 0.30 0.007 0.012 c 0.09 0.20 0.004 0.0089 d 4.9 5 5.1 0.193 0.197 0.201 e 6.2 6.4 6.6 0.244 0.252 0.260 e1 4.3 4.4 4.48 0.169 0.173 0.176 e 0.65 bsc 0.0256 bsc k0? 8?0? 8? l 0.45 0.60 0.75 0.018 0.024 0.030 tssop14 mechanical data c e b a2 a e1 d 1 pin 1 identification a1 l k e 0080337d
74lvc126a 9/12 dim. mm. inch min. typ max. min. typ. max. a 330 12.992 c 12.8 13.2 0.504 0.519 d 20.2 0.795 n 60 2.362 t 22.4 0.882 ao 6.4 6.6 0.252 0.260 bo 9 9.2 0.354 0.362 ko 2.1 2.3 0.082 0.090 po 3.9 4.1 0.153 0.161 p 7.9 8.1 0.311 0.319 tape & reel so-14 mechanical data
74lvc126a 10/12 dim. mm. inch min. typ max. min. typ. max. a 330 12.992 c 12.8 13.2 0.504 0.519 d 20.2 0.795 n 60 2.362 t 22.4 0.882 ao 6.7 6.9 0.264 0.272 bo 5.3 5.5 0.209 0.217 ko 1.6 1.8 0.063 0.071 po 3.9 4.1 0.153 0.161 p 7.9 8.1 0.311 0.319 tape & reel tssop14 mechanical data
74lvc126a 11/12 table 11: revision history date revision description of changes 21-may-2004 1 first release. 26-jul-2004 2 ordering codes revision - pag. 1.
74lvc126a 12/12 information furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsibility for the co nsequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of stmicroelectronics. specifications mentioned in this publicati on are subject to change without notice. this publication supersedes and replaces all information previously supplied. stmicroelectronics prod ucts are not authorized for use as critical components in life support devices or systems without express written approval of stmicroelectro nics. the st logo is a registered trademark of stmicroelectronics all other names are the property of their respective owners ? 2004 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com

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