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1. general description the 74ahc/ahct157 are high-speed si-gate cmos devices and are pin compatible with low power schottky ttl (lsttl). they are speci?ed in compliance with jedec standard no. 7a. the 74ahc/ahct157 are quad 2-input multiplexer which select 4 bits of data from two sources under the control of a common data select input (s). the enable input ( e) is active low. when e is high, all of the outputs (1y to 4y) are forced low regardless of all other input conditions. moving the data from two groups of registers to four common output buses is a common use of the 74ahc/ahct157. the state of the common data select input (s) determines the particular register from which the data comes. it can also be used as function generator. the device is useful for implementing highly irregular logic by generating any four of the 16 different functions of two variables with one variable common. the 74ahc/ahct157 is logic implementation of a 4-pole, 2-position switch, where the position of the switch is determine by the logic levels applied to s. the logic equations are: 1y = e (1i1 s + 1i0 s) 2y = e (2i1 s + 2i0 s) 3y = e (3i1 s + 3i0 s) 4y = e (4i1 s + 4i0 s) the 74ahc/ahct157 is identical to the 74ahc/ahct158 but has non-inverting (true) outputs. 2. features n balanced propagation delays n all inputs have a schmitt-trigger action n inputs accepts voltages higher than v cc n multiple input enable for easy expansion n ideal for memory chip select decoding n for 74ahc157 only: operates with cmos input levels n for 74ahct157 only: operates with ttl input levels n esd protection: u hbm jesd22-a114e exceeds 2000 v u mm jesd22-a115-a exceeds 200 v u cdm jesd22-c101c exceeds 1000 v 74ahc157; 74ahct157 quad 2-input multiplexer rev. 02 9 november 2007 product data sheet
74ahc_ahct157_2 ? nxp b.v. 2007. all rights reserved. product data sheet rev. 02 9 november 2007 2 of 16 nxp semiconductors 74ahc157; 74ahct157 quad 2-input multiplexer n multiple package options n speci?ed from - 40 c to +85 c and from - 40 c to +125 c 3. ordering information 4. functional diagram table 1. ordering information type number package temperature range name description version 74ahc157d - 40 c to +125 c so16 plastic small outline package; 16 leads; body width 3.9 mm sot109-1 74ahct157d 74ahc157pw - 40 c to +125 c tssop16 plastic thin shrink small outline package; 16 leads; body width 4.4 mm sot403-1 74ahct157pw 74ahc157bq - 40 c to +125 c dhvqfn16 plastic dual in-line compatible thermal enhanced very thin quad ?at package; no leads; 16 terminals; body 2.5 3.5 0.85 mm sot763-1 74ahct157bq fig 1. logic diagram fig 2. logic symbol 1y 1i1 1i0 2y 2i1 2i0 3y 3i1 3i0 mna484 4y 4i1 4i0 s e mna481 s 1 15 12 9 7 4 13 14 10 11 6 5 3 2 e 1y 1i1 1i0 2y 2i1 2i0 3y 3i1 3i0 4y 4i1 4i0
74ahc_ahct157_2 ? nxp b.v. 2007. all rights reserved. product data sheet rev. 02 9 november 2007 3 of 16 nxp semiconductors 74ahc157; 74ahct157 quad 2-input multiplexer 5. pinning information 5.1 pinning fig 3. logic symbol fig 4. iec logic symbol mna483 multiplexer outputs selector 1y 2y 3y 4y 12 9 7 4 s 13 15 1 14 10 11 6 5 3 2 e 1i0 1i1 2i0 2i1 3i0 3i1 4i0 4i1 mna482 12 9 7 1 g1 15 en 1 mux 1 4 13 14 10 11 6 5 3 2 (1) the die substrate is attached to this pad using conductive die attach material. it can not be used as a supply pin or input. fig 5. pin con?guration so16, tssop16 fig 6. pin con?guration dhvqfn16 74ahc157 74ahct157 sv cc 1i0 e 1i1 4i0 1y 4i1 2i0 4y 2i1 3i0 2y 3i1 gnd 3y 001aah066 1 2 3 4 5 6 7 8 10 9 12 11 14 13 16 15 001aac931 157 2y 3i1 2i1 3i0 2i0 4y gnd (1) 1y 4i1 1i1 4i0 1i0 e gnd 3y s v cc transparent top view 7 10 6 11 5 12 4 13 3 14 2 15 8 9 1 16 terminal 1 index area
74ahc_ahct157_2 ? nxp b.v. 2007. all rights reserved. product data sheet rev. 02 9 november 2007 4 of 16 nxp semiconductors 74ahc157; 74ahct157 quad 2-input multiplexer 5.2 pin description 6. functional description [1] h = high voltage level; l = low voltage level; x = dont care. table 2. pin description symbol pin description s 1 common data select input 1i0 to 4i0 2, 5, 11, 14 data inputs from source 0 1i1 to 4i1 3, 6, 10, 13 data inputs from source 1 1y to 4y 4, 7, 9, 12 multiplexer outputs gnd 8 ground (0 v) e 15 enable input (active low) v cc 16 supply voltage table 3. function table [1] input output e s ni0 ni1 ny hxxxl lllxl llhxh lhxll lhxhh
74ahc_ahct157_2 ? nxp b.v. 2007. all rights reserved. product data sheet rev. 02 9 november 2007 5 of 16 nxp semiconductors 74ahc157; 74ahct157 quad 2-input multiplexer 7. limiting values [1] the input and output voltage ratings may be exceeded if the input and output current ratings are observed. [2] p tot derates linearly with 8 mw/k above 70 c. [3] p tot derates linearly with 5.5 mw/k above 60 c. [4] p tot derates linearly with 4.5 mw/k above 60 c. 8. recommended operating conditions table 4. limiting values in accordance with the absolute maximum rating system (iec 60134). voltages are referenced to gnd (ground = 0 v). symbol parameter conditions min max unit v cc supply voltage - 0.5 +7.0 v v i input voltage - 0.5 +7.0 v i ik input clamping current v i < - 0.5 v [1] - 20 - ma i ok output clamping current v o < - 0.5 v or v o >v cc + 0.5 v [1] - 20 ma i o output current v o = - 0.5 v to (v cc + 0.5 v) - 25 ma i cc supply current - 75 ma i gnd ground current - 75 - ma t stg storage temperature - 65 +150 c p tot total power dissipation t amb = - 40 c to +125 c so16 package [2] - 500 mw tssop16 package [3] - 500 mw dhvqfn16 package [4] - 500 mw table 5. recommended operating conditions voltages are referenced to gnd (ground = 0 v). symbol parameter conditions 74ahc157 74ahct157 unit min typ max min typ max v cc supply voltage 2.0 5.0 5.5 4.5 5.0 5.5 v v i input voltage 0 - 5.5 0 - 5.5 v v o output voltage 0 - v cc 0-v cc v t amb ambient temperature - 40 +25 +125 - 40 +25 +125 c d t/ d v input transition rise and fall rate v cc = 3.3 v 0.3 v - - 100 - - - ns/v v cc = 5.0 v 0.5 v - - 20 - - 20 ns/v
74ahc_ahct157_2 ? nxp b.v. 2007. all rights reserved. product data sheet rev. 02 9 november 2007 6 of 16 nxp semiconductors 74ahc157; 74ahct157 quad 2-input multiplexer 9. static characteristics table 6. static characteristics voltages are referenced to gnd (ground = 0 v). symbol parameter conditions 25 c - 40 c to +85 c - 40 c to +125 c unit min typ max min max min max for type 74ahc157 v ih high-level input voltage v cc = 2.0 v 1.5 - - 1.5 - 1.5 - v v cc = 3.0 v 2.1 - - 2.1 - 2.1 - v v cc = 5.5 v 3.85 - - 3.85 - 3.85 - v v il low-level input voltage v cc = 2.0 v - - 0.5 - 0.5 - 0.5 v v cc = 3.0 v - - 0.9 - 0.9 - 0.9 v v cc = 5.5 v - - 1.65 - 1.65 - 1.65 v v oh high-level output voltage v i = v ih or v il i o = - 50 m a; v cc = 2.0 v 1.9 2.0 - 1.9 - 1.9 - v i o = - 50 m a; v cc = 3.0 v 2.9 3.0 - 2.9 - 2.9 - v i o = - 50 m a; v cc = 4.5 v 4.4 4.5 - 4.4 - 4.4 - v i o = - 4.0 ma; v cc = 3.0 v 2.58 - - 2.48 - 2.40 - v i o = - 8.0 ma; v cc = 4.5 v 3.94 - - 3.8 - 3.70 - v v ol low-level output voltage v i = v ih or v il i o = 50 m a; v cc = 2.0 v - 0 0.1 - 0.1 - 0.1 v i o = 50 m a; v cc = 3.0 v - 0 0.1 - 0.1 - 0.1 v i o = 50 m a; v cc = 4.5 v - 0 0.1 - 0.1 - 0.1 v i o = 4.0 ma; v cc = 3.0 v - - 0.36 - 0.44 - 0.55 v i o = 8.0 ma; v cc = 4.5 v - - 0.36 - 0.44 - 0.55 v i i input leakage current v i = 5.5 v or gnd; v cc =0vto5.5v - - 0.1 - 1.0 - 2.0 m a i cc supply current v i =v cc or gnd; i o = 0 a; v cc = 5.5 v - - 4.0 - 40 - 80 m a c i input capacitance - 3.0 10 - 10 - 10 pf c o output capacitance - 4.0 - - - - - pf for type 74ahct157 v ih high-level input voltage v cc = 4.5 v to 5.5 v 2.0 - - 2.0 - 2.0 - v v il low-level input voltage v cc = 4.5 v to 5.5 v - - 0.8 - 0.8 - 0.8 v v oh high-level output voltage v i = v ih or v il ; v cc = 4.5 v i o = - 50 m a 4.4 4.5 - 4.4 - 4.4 - v i o = - 8.0 ma 3.94 - - 3.8 - 3.70 - v v ol low-level output voltage v i = v ih or v il ; v cc = 4.5 v i o = 50 m a - 0 0.1 - 0.1 - 0.1 v i o = 8.0 ma - - 0.36 - 0.44 - 0.55 v
74ahc_ahct157_2 ? nxp b.v. 2007. all rights reserved. product data sheet rev. 02 9 november 2007 7 of 16 nxp semiconductors 74ahc157; 74ahct157 quad 2-input multiplexer 10. dynamic characteristics i i input leakage current v i = 5.5 v or gnd; v cc =0vto5.5v - - 0.1 - 1.0 - 2.0 m a i cc supply current v i =v cc or gnd; i o = 0 a; v cc = 5.5 v - - 4.0 - 40 - 80 m a d i cc additional supply current per input pin; v i =v cc - 2.1 v; i o = 0 a; other pins at v cc or gnd; v cc = 4.5 v to 5.5 v - - 1.35 - 1.5 - 1.5 ma c i input capacitance - 3 10 - 10 - 10 pf c o output capacitance - 4.0 - - - - - pf table 6. static characteristics continued voltages are referenced to gnd (ground = 0 v). symbol parameter conditions 25 c - 40 c to +85 c - 40 c to +125 c unit min typ max min max min max table 7. dynamic characteristics gnd = 0 v; for test circuit see figure 9 . symbol parameter conditions 25 c - 40 c to +85 c - 40 c to +125 c unit min typ [1] max min max min max for type 74ahc157 t pd propagation delay ni0, ni1 to ny; see figure 7 [2] v cc = 3.0 v to 3.6 v c l = 15 pf - 4.4 9.7 1.0 11.5 1.0 12.5 ns c l = 50 pf - 6.3 13.2 1.0 15.0 1.0 16.5 ns v cc = 4.5 v to 5.5 v c l = 15 pf - 3.2 6.4 1.0 7.5 1.0 8.0 ns c l = 50 pf - 4.6 8.4 1.0 9.5 1.0 10.5 ns s to ny; see figure 7 [2] v cc = 3.0 v to 3.6 v c l = 15 pf - 4.8 13.6 1.0 16.0 1.0 17.0 ns c l = 50 pf - 6.8 17.1 1.0 19.5 1.0 21.5 ns v cc = 4.5 v to 5.5 v c l = 15 pf - 3.6 8.6 1.0 10.0 1.0 11.0 ns c l = 50 pf - 5.2 10.6 1.0 12.0 1.0 13.5 ns e to ny; see figure 8 [2] v cc = 3.0 v to 3.6 v c l = 15 pf - 5.9 13.2 1.0 15.5 1.0 16.5 ns c l = 50 pf - 8.4 16.7 1.0 19.0 1.0 21.0 ns v cc = 4.5 v to 5.5 v c l = 15 pf - 4.2 8.1 1.0 9.5 1.0 10.5 ns c l = 50 pf - 6.0 10.1 1.0 11.5 1.0 13.0 ns
74ahc_ahct157_2 ? nxp b.v. 2007. all rights reserved. product data sheet rev. 02 9 november 2007 8 of 16 nxp semiconductors 74ahc157; 74ahct157 quad 2-input multiplexer [1] typical values are measured at nominal supply voltage (v cc = 3.3 v and v cc = 5.0 v). [2] t pd is the same as t plh and t phl . [3] c pd is used to determine the dynamic power dissipation p d ( m w). p d =c pd v cc 2 f i + ? (c l v cc 2 f o ) where: f i = input frequency in mhz; f o = output frequency in mhz; c l = output load capacitance in pf; v cc = supply voltage in volts. c pd power dissipation capacitance c l = 50 pf; f i = 1 mhz; v i = gnd to v cc [3] 4 outputs switching via s - 31 - - - - - pf 1 outputs switching via i - 13 - - - - - pf for type 74ahct157 t pd propagation delay ni0, ni1 to ny; see figure 7 [2] v cc = 4.5 v to 5.5 v c l = 15 pf - 3.2 6.4 1.0 7.5 1.0 8.0 ns c l = 50 pf - 4.6 8.7 1.0 9.8 1.0 11.0 ns s to ny; see figure 7 v cc = 4.5 v to 5.5 v c l = 15 pf - 3.7 8.6 1.0 10.0 1.0 11.0 ns c l = 50 pf - 5.2 10.4 1.0 12.0 1.0 13.0 ns e to ny; see figure 8 [2] v cc = 4.5 v to 5.5 v c l = 15 pf - 4.7 8.1 1.0 9.5 1.0 10.5 ns c l = 50 pf - 6.7 10.6 1.0 12.0 1.0 13.5 ns c pd power dissipation capacitance c l = 50 pf; f i = 1 mhz; v i = gnd to v cc [3] 4 outputs switching via s - 41 - - - - - pf 1 outputs switching via i - 16 - - - - - pf table 7. dynamic characteristics continued gnd = 0 v; for test circuit see figure 9 . symbol parameter conditions 25 c - 40 c to +85 c - 40 c to +125 c unit min typ [1] max min max min max
74ahc_ahct157_2 ? nxp b.v. 2007. all rights reserved. product data sheet rev. 02 9 november 2007 9 of 16 nxp semiconductors 74ahc157; 74ahct157 quad 2-input multiplexer 11. waveforms measurement points are given in t ab le 8 . v ol and v oh are typical voltage output levels that occur with the output load. fig 7. propagation delay input (ni0, ni1, s) to output (nyn) mna486 t phl t plh v m v m ni0, ni1, s input ny output gnd v i v oh v ol measurement points are given in t ab le 8 . v ol and v oh are typical voltage output levels that occur with the output load. fig 8. propagation delay input ( e) to output (ny) mna485 t phl t plh v m v m e input ny output gnd v cc v oh v ol table 8. measurement points type input output v m v m 74ahc157 0.5v cc 0.5v cc 74ahct157 1.5 v 0.5v cc
74ahc_ahct157_2 ? nxp b.v. 2007. all rights reserved. product data sheet rev. 02 9 november 2007 10 of 16 nxp semiconductors 74ahc157; 74ahct157 quad 2-input multiplexer test data is given in t ab le 9 . de?nitions test circuit: r t = termination resistance should be equal to output impedance z o of the pulse generator c l = load capacitance including jig and probe capacitance r l = load resistor s1 = test selection switch fig 9. load circuitry for switching times v m v m t w t w 10 % 90 % 0 v v i v i negative pulse positive pulse 0 v v m v m 90 % 10 % t f t r t r t f 001aad983 dut v cc v cc v i v o r t r l s1 c l open pulse generator table 9. test data type input load s1 position v i t r , t f c l r l t phl , t plh t pzh , t phz t pzl , t plz 74ahc157 v cc 3.0 ns 15 pf, 50 pf 1 k w open gnd v cc 74ahct157 3.0 v 3.0 ns 15 pf, 50 pf 1 k w open gnd v cc
74ahc_ahct157_2 ? nxp b.v. 2007. all rights reserved. product data sheet rev. 02 9 november 2007 11 of 16 nxp semiconductors 74ahc157; 74ahct157 quad 2-input multiplexer 12. package outline fig 10. package outline sot109-1 (so16) x w m q a a 1 a 2 b p d h e l p q detail x e z e c l v m a (a ) 3 a 8 9 1 16 y pin 1 index unit a max. a 1 a 2 a 3 b p cd (1) e (1) (1) eh e ll p qz y w v q references outline version european projection issue date iec jedec jeita mm inches 1.75 0.25 0.10 1.45 1.25 0.25 0.49 0.36 0.25 0.19 10.0 9.8 4.0 3.8 1.27 6.2 5.8 0.7 0.6 0.7 0.3 8 0 o o 0.25 0.1 dimensions (inch dimensions are derived from the original mm dimensions) note 1. plastic or metal protrusions of 0.15 mm (0.006 inch) maximum per side are not included. 1.0 0.4 sot109-1 99-12-27 03-02-19 076e07 ms-012 0.069 0.010 0.004 0.057 0.049 0.01 0.019 0.014 0.0100 0.0075 0.39 0.38 0.16 0.15 0.05 1.05 0.041 0.244 0.228 0.028 0.020 0.028 0.012 0.01 0.25 0.01 0.004 0.039 0.016 0 2.5 5 mm scale so16: plastic small outline package; 16 leads; body width 3.9 mm sot109-1
74ahc_ahct157_2 ? nxp b.v. 2007. all rights reserved. product data sheet rev. 02 9 november 2007 12 of 16 nxp semiconductors 74ahc157; 74ahct157 quad 2-input multiplexer fig 11. package outline sot403-1 (tssop16) unit a 1 a 2 a 3 b p cd (1) e (2) (1) eh e ll p qz y w v q references outline version european projection issue date iec jedec jeita mm 0.15 0.05 0.95 0.80 0.30 0.19 0.2 0.1 5.1 4.9 4.5 4.3 0.65 6.6 6.2 0.4 0.3 0.40 0.06 8 0 o o 0.13 0.1 0.2 1 dimensions (mm are the original dimensions) notes 1. plastic or metal protrusions of 0.15 mm maximum per side are not included. 2. plastic interlead protrusions of 0.25 mm maximum per side are not included. 0.75 0.50 sot403-1 mo-153 99-12-27 03-02-18 w m b p d z e 0.25 18 16 9 q a a 1 a 2 l p q detail x l (a ) 3 h e e c v m a x a y 0 2.5 5 mm scale tssop16: plastic thin shrink small outline package; 16 leads; body width 4.4 mm sot403-1 a max. 1.1 pin 1 index
74ahc_ahct157_2 ? nxp b.v. 2007. all rights reserved. product data sheet rev. 02 9 november 2007 13 of 16 nxp semiconductors 74ahc157; 74ahct157 quad 2-input multiplexer fig 12. package outline sot763-1 (dhvqfn16) terminal 1 index area 0.5 1 a 1 e h b unit y e 0.2 c references outline version european projection issue date iec jedec jeita mm 3.6 3.4 d h 2.15 1.85 y 1 2.6 2.4 1.15 0.85 e 1 2.5 0.30 0.18 0.05 0.00 0.05 0.1 dimensions (mm are the original dimensions) sot763-1 mo-241 - - - - - - 0.5 0.3 l 0.1 v 0.05 w 0 2.5 5 mm scale sot763-1 dhvqfn16: plastic dual in-line compatible thermal enhanced very thin quad flat package; no leads; 16 terminals; body 2.5 x 3.5 x 0.85 mm a (1) max. a a 1 c detail x y y 1 c e l e h d h e e 1 b 27 15 10 9 8 1 16 x d e c b a terminal 1 index area a c c b v m w m e (1) note 1. plastic or metal protrusions of 0.075 mm maximum per side are not included. d (1) 02-10-17 03-01-27
74ahc_ahct157_2 ? nxp b.v. 2007. all rights reserved. product data sheet rev. 02 9 november 2007 14 of 16 nxp semiconductors 74ahc157; 74ahct157 quad 2-input multiplexer 13. abbreviations 14. revision history table 10. abbreviations acronym description cdm charged-device model cmos complementary metal oxide semiconductor dut device under test esd electrostatic discharge hbm human body model mm machine model ttl transistor-transistor logic table 11. revision history document id release date data sheet status change notice supersedes 74ahc_ahct157_2 20071109 product data sheet - 74ahc_ahct157_1 modi?cations: ? the format of this data sheet has been redesigned to comply with the new identity guidelines of nxp semiconductors. ? legal texts have been adapted to the new company name where appropriate. ? section 3 : dhvqfn16 package added. ? section 8 : derating values added for dhvqfn16 package. ? section 12 : outline drawing added for dhvqfn16 package. 74ahc_ahct157_1 19990924 product speci?cation - -
74ahc_ahct157_2 ? nxp b.v. 2007. all rights reserved. product data sheet rev. 02 9 november 2007 15 of 16 nxp semiconductors 74ahc157; 74ahct157 quad 2-input multiplexer 15. legal information 15.1 data sheet status [1] please consult the most recently issued document before initiating or completing a design. [2] the term short data sheet is explained in section de?nitions. [3] the product status of device(s) described in this document may have changed since this document was published and may differ in case of multiple dev ices. the latest product status information is available on the internet at url http://www .nxp .com . 15.2 de?nitions draft the document is a draft version only. the content is still under internal review and subject to formal approval, which may result in modi?cations or additions. nxp semiconductors does not give any representations or warranties as to the accuracy or completeness of information included herein and shall have no liability for the consequences of use of such information. short data sheet a short data sheet is an extract from a full data sheet with the same product type number(s) and title. a short data sheet is intended for quick reference only and should not be relied upon to contain detailed and full information. for detailed and full information see the relevant full data sheet, which is available on request via the local nxp semiconductors sales of?ce. in case of any inconsistency or con?ict with the short data sheet, the full data sheet shall prevail. 15.3 disclaimers general information in this document is believed to be accurate and reliable. however, nxp semiconductors does not give any representations or warranties, expressed or implied, as to the accuracy or completeness of such information and shall have no liability for the consequences of use of such information. right to make changes nxp semiconductors reserves the right to make changes to information published in this document, including without limitation speci?cations and product descriptions, at any time and without notice. this document supersedes and replaces all information supplied prior to the publication hereof. suitability for use nxp semiconductors products are not designed, authorized or warranted to be suitable for use in medical, military, aircraft, space or life support equipment, nor in applications where failure or malfunction of an nxp semiconductors product can reasonably be expected to result in personal injury, death or severe property or environmental damage. nxp semiconductors accepts no liability for inclusion and/or use of nxp semiconductors products in such equipment or applications and therefore such inclusion and/or use is at the customers own risk. applications applications that are described herein for any of these products are for illustrative purposes only. nxp semiconductors makes no representation or warranty that such applications will be suitable for the speci?ed use without further testing or modi?cation. limiting values stress above one or more limiting values (as de?ned in the absolute maximum ratings system of iec 60134) may cause permanent damage to the device. limiting values are stress ratings only and operation of the device at these or any other conditions above those given in the characteristics sections of this document is not implied. exposure to limiting values for extended periods may affect device reliability. terms and conditions of sale nxp semiconductors products are sold subject to the general terms and conditions of commercial sale, as published at http://www .nxp .com/pro? le/ter ms , including those pertaining to warranty, intellectual property rights infringement and limitation of liability, unless explicitly otherwise agreed to in writing by nxp semiconductors. in case of any inconsistency or con?ict between information in this document and such terms and conditions, the latter will prevail. no offer to sell or license nothing in this document may be interpreted or construed as an offer to sell products that is open for acceptance or the grant, conveyance or implication of any license under any copyrights, patents or other industrial or intellectual property rights. 15.4 trademarks notice: all referenced brands, product names, service names and trademarks are the property of their respective owners. 16. contact information for additional information, please visit: http://www .nxp.com for sales of?ce addresses, send an email to: salesad dresses@nxp.com document status [1] [2] product status [3] de?nition objective [short] data sheet development this document contains data from the objective speci?cation for product development. preliminary [short] data sheet quali?cation this document contains data from the preliminary speci?cation. product [short] data sheet production this document contains the product speci?cation.
nxp semiconductors 74ahc157; 74ahct157 quad 2-input multiplexer ? nxp b.v. 2007. all rights reserved. for more information, please visit: http://www.nxp.com for sales office addresses, please send an email to: salesaddresses@nxp.com date of release: 9 november 2007 document identifier: 74ahc_ahct157_2 please be aware that important notices concerning this document and the product(s) described herein, have been included in section legal information. 17. contents 1 general description . . . . . . . . . . . . . . . . . . . . . . 1 2 features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 3 ordering information . . . . . . . . . . . . . . . . . . . . . 2 4 functional diagram . . . . . . . . . . . . . . . . . . . . . . 2 5 pinning information . . . . . . . . . . . . . . . . . . . . . . 3 5.1 pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 5.2 pin description . . . . . . . . . . . . . . . . . . . . . . . . . 4 6 functional description . . . . . . . . . . . . . . . . . . . 4 7 limiting values. . . . . . . . . . . . . . . . . . . . . . . . . . 5 8 recommended operating conditions. . . . . . . . 5 9 static characteristics. . . . . . . . . . . . . . . . . . . . . 6 10 dynamic characteristics . . . . . . . . . . . . . . . . . . 7 11 waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 12 package outline . . . . . . . . . . . . . . . . . . . . . . . . 11 13 abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . 14 14 revision history . . . . . . . . . . . . . . . . . . . . . . . . 14 15 legal information. . . . . . . . . . . . . . . . . . . . . . . 15 15.1 data sheet status . . . . . . . . . . . . . . . . . . . . . . 15 15.2 de?nitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 15.3 disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 15.4 trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 16 contact information. . . . . . . . . . . . . . . . . . . . . 15 17 contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

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