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february 2007 rev 7 1/15 15 74lcx16245 low voltage cmos 16-bit bus transceiver (3-state) with 5v tolerant inputs and outputs features 5v tolerant inputs and outputs high speed: ?t pd = 4.5ns (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 24ma balanced propagation delays: ?t plh ? t phl operating voltage range: ?v cc (opr) = 2.0v to 3.6v pin and function compatible with 74 series 16245 latch-up performance exceeds 500ma (jesd 17) esd performance: ? hbm > 2000v (mil std 883 method 3015); mm > 200v description the 74lcx16245 is a low voltage cmos 16 bit bus transceiver (3-state) fabricated with sub- micron silicon gate and do uble-layer metal wiring c 2 mos technology. it is ideal for low power and high speed 3.3v applications; it can be interfaced to 5v signal environment for both inputs and outputs. this ic is intended for two-way asynchronous communication between data buses; the direction of data transmission is determined by dir input. the two enable inputs ng can be used to disable the device so that the buses are effectively isolated. it has same 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 2kv esd immunity and transient excess voltage. all floating bus terminals during high z state must be held high or low. tssop48 www.st.com order codes part number package packaging 74LCX16245TTR tssop48 tape and reel
contents 74lcx16245 2/15 contents 1 logic symbols and i/o equivalent circuit . . . . . . . . . . . . . . . . . . . . . . . . 3 2 pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.1 pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.2 pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3 logic states . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3.1 truth table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4.1 recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 6 test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 7 waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 8 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 9 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
74lcx16245 logic symbols and i/o equivalent circuit 3/15 1 logic symbols and i/o equivalent circuit figure 1. iec logic symbols figure 2. input and output equivalent circuit
pin settings 74lcx16245 4/15 2 pin settings 2.1 pin connection figure 3. pin connection (top through view)
74lcx16245 logic states 5/15 2.2 pin description 3 logic states 3.1 truth table note: x : do not care z : high impedance table 1. pin description pin n symbol name and function 1 1dir directional control 2, 3, 5, 6, 8, 9, 11, 12 1b1 to 1b8 data inputs/outputs 13, 14, 16, 17, 19, 20, 22, 23 2b1 to 2b8 data inputs/outputs 24 2dir directional control 25 2g output enable input 36, 35, 33, 32, 30, 29, 27, 26 2a1 to 2a8 data inputs/outputs 47, 46, 44, 43, 41, 40, 38, 38 1a1 to 1a8 data inputs/outputs 48 1g output enable input 4, 10, 15, 21, 28, 34, 39, 45 gnd ground (0v) 7, 18, 31, 42 v cc positive supply voltage table 2. truth table inputs function output g dir a bus b bus yn l l output input a = b l h input output b = a hxzzz
maximum rating 74lcx16245 6/15 4 maximum rating stressing the device above the rating listed in the ?absolute maximum ratings? table may cause permanent damage to the device. these are stress ratings only and operation of the device at these or any other conditions above those indicated in the operating sections of this specification is not imp lied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. refer also to the st microelectronics sure program and other relevant quality documents. 4.1 recommended operating conditions table 3. absolute maximum ratings 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 (off state) -0.5 to +7.0 v v o dc output voltage (high or low state) (1) 1. i o absolute maximum rating must be observed -0.5 to v cc + 0.5 v i ik dc input diode current -50 ma i ok dc output diode current (2) 2. v o < gnd -50 ma i o dc output current 50 ma i cc dc supply current per supply pin 100 ma i gnd dc ground current per supply pin 100 ma t stg storage temperature -65 to +150 c t l lead temperature (10 sec) 300 c table 4. recommended operating conditions symsbol parameter value unit v cc supply voltage (1) 1. truth table guaranteed: 1.5v to 3.6v 2.0 to 3.6 v v i input voltage 0 to 5.5 v v o output voltage (off state) 0 to 5.5 v v o output voltage (hig h 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 = 2.7v) 12 ma t op operating temperature -40 to 85 c dt/dv input rise and fall time (2) 2. v in from 0.8v to 2v at v cc = 3.0v 0 to 10 ns/v
74lcx16245 electrical characteristics 7/15 5 electrical characteristics table 5. dc specifications symbol parameter test condition value unit v cc (v) -40 to 85c min max v ih high level input voltage 2.7 to 3.6 2.0 v v il low level input voltage 0.8 v v oh high level output voltage 2.7 to 3.6 i o = -100 av cc -0.2 v 2.7 i o = -12ma 2.2 3.0 i o = -18ma 2.4 i o = -24ma 2.2 v ol low level output voltage 2.7 to 3.6 i o = 100 a 0.2 v 2.7 i o = 12ma 0.4 3.0 i o = 16ma 0.4 i o = 24ma 0.55 i i input leakage current 2.7 to 3.6 v i = 0 to 5.5v 5 a i off power off leakage current 0 v i or v o = 5.5v 10 a i oz high impedance output leakage current 2.7 to 3.6 v i = v ih or v il v o = 0 to v cc 5 a i cc quiescent supply current 2.7 to 3.6 v i = v cc or gnd 20 a v i or v o = 3.6 to 5.5v 20 ? i cc i incr. per input 2.7 to 3.6 v ih = v cc - 0.6v 500 a table 6. dynamic switching characteristics symbol parameter test condition value unit v cc (v) t a = 25 c min typ max v olp dynamic low level quiet output (1) 1. number of outputs 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. 3.3 c l = 50pf v il = 0v, v ih = 3.3v 0.8 v v olv -0.8
electrical characteristics 74lcx16245 8/15 table 7. ac electrical characteristics symbol parameter test condition value unit v cc (v) c l (pf) r l ( ? ) t s = t r (ns) -40 to 85 c min max t plh t phl propagation delay time 2.7 50 500 2.5 1.5 5.2 ns 3.0 to 3.6 1.5 4.5 t pzl t pzh output enable time 2.7 50 500 2.5 1.5 7.2 ns 3.0 to 3.6 1.5 6.5 t plz t phz output disable time 2.7 50 500 2.5 1.5 6.9 ns 3.0 to 3.6 1.5 6.4 t oslh t oshl output to output skew time (1) (2) 1. skew is defined as the absolute value of the di fference between the actual propagation delay for any two outputs of the same device switching 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 3.0 to 3.6 50 500 2.5 1.0 ns table 8. capacitive characteristics symbol parameter test condition value unit v cc (v) t a = 25 c min typ max c in input capacitance 3.3 v in = 0 to v cc 7pf c out output capacitance 3.3 v in = 0 to v cc 8pf c pd power dissipation capacitance (1) 1. c pd is defined as the value of the ic?s internal equivalent capacitance whic h 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 /16 (per circuit) 3.3 f in = 10mhz v in = 0 or v cc 20 pf
74lcx16245 test circuit 9/15 6 test circuit figure 4. test circuit c l = 50pf or equivalent (includes jig and probe capacitance) r l = r 1 = 500 ? or equivalent r t = z out of pulse generator (typically 50 ? ) figure 5. test circuit test switch t plh , t phl open t pzl , t plz 6v t pzh , t phz gnd
waveforms 74lcx16245 10/15 7 waveforms figure 6. propagation delays (f = 1mhz; 50% duty cycle) figure 7. output enable and disable time (f = 1mhz; 50% duty cycle)
74lcx16245 package mechanical data 11/15 8 package mechanical data in order to meet environmental requirements, st offers these devices in ecopack? packages. these packages have a lead-free second level interconnect . the category of second level interconnect is marked on the package and on the inner box label, in compliance with jedec standard jesd97. the maximum ratings related to soldering conditions are also marked on the inner box label. ecopack is an st trademark. ecopack specifications are available at: www.st.com
package mechanical data 74lcx16245 12/15 dim. mm. inch min. typ max. min. typ. max. a 1.2 0.047 a1 0.05 0.15 0.002 0.006 a2 0.9 0.035 b 0.17 0.27 0.0067 0.011 c 0.09 0.20 0.0035 0.0079 d 12.4 12.6 0.488 0.496 e 8.1 bsc 0.318 bsc e1 6.0 6.2 0.236 0.244 e 0.5 bsc 0.0197 bsc k0 80 8 l 0.45 0.75 0.018 0.030 tssop48 mechanical data c e b a2 a e1 d 1 pin 1 identification a1 l k e 7065588d
74lcx16245 package mechanical data 13/15 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 30.4 1.197 ao 8.7 8.9 0.343 0.350 bo 13.1 13.3 0.516 0.524 ko 1.5 1.7 0.059 0.067 po 3.9 4.1 0.153 0.161 p 11.9 12.1 0.468 0.476 tape & reel tssop48 mechanical data
revision history 74lcx16245 14/15 9 revision history table 9. revision history date revision changes 15-sep-2004 6 ordering codes revision - pag. 1. 06-feb-2007 7 document reformatted, temperature ranges updated
74lcx16245 15/15 please read carefully: information in this document is provided solely in connection with st products. stmicroelectronics nv and its subsidiaries (?st ?) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described he rein at any time, without notice. all st products are sold pursuant to st?s terms and conditions of sale. purchasers are solely responsible for the choice, selection and use of the st products and services described herein, and st as sumes no liability whatsoever relating to the choice, selection or use of the st products and services described herein. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. i f any part of this document refers to any third party products or services it shall not be deemed a license grant by st for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoev er of such third party products or services or any intellectual property contained therein. unless otherwise set forth in st?s terms and conditions of sale st disclaims any express or implied warranty with respect to the use and/or sale of st products including without limitation implied warranties of merchantability, fitness for a parti cular purpose (and their equivalents under the laws of any jurisdiction), or infringement of any patent, copyright or other intellectual property right. unless expressly approved in writing by an authorized st representative, st products are not recommended, authorized or warranted for use in milita ry, air craft, space, life saving, or life sustaining applications, nor in products or systems where failure or malfunction may result in personal injury, death, or severe property or environmental damage. st products which are not specified as "automotive grade" may only be used in automotive applications at user?s own risk. resale of st products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by st for the st product or service described herein and shall not create or extend in any manner whatsoev er, any liability of st. st and the st logo are trademarks or registered trademarks of st in various countries. information in this document supersedes and replaces all information previously supplied. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners. ? 2007 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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