SCLS387K − SEPTEMBER 1997 − REVISED APRIL 2005 D 2-V to 5.5-V VCC Operation D Max tpd of 7 ns at 5 V D Typical VOLP (Output Ground Bounce) 14 2 13 3 12 4 11 5 10 6 9 7 8 VCC 4B 4A 4Y 3B 3A 3Y 1B 1Y 2A 2B 2Y 14 1B 1A NC VCC 4B 1 13 4B 2 3 12 4A 4 11 4Y 10 3B 9 3A 5 6 7 8 SN54LV08A . . . FK PACKAGE (TOP VIEW) 1Y NC 2A NC 2B 4 3 2 1 20 19 18 5 17 6 16 7 15 8 14 9 10 11 12 13 4A NC 4Y NC 3B 2Y GND NC 3Y 3A 1 VCC 1A 1B 1Y 2A 2B 2Y GND Operation Latch-Up Performance Exceeds 250 mA Per JESD 17 ESD Protection Exceeds JESD 22 − 2000-V Human-Body Model (A114-A) − 200-V Machine Model (A115-A) − 1000-V Charged-Device Model (C101) SN74LV08A . . . RGY PACKAGE (TOP VIEW) 3Y SN54LV08A . . . J OR W PACKAGE SN74LV08A . . . D, DB, DGV, NS, OR PW PACKAGE (TOP VIEW) D 1A D D <0.8 V at VCC = 3.3 V, TA = 25°C Typical VOHV (Output VOH Undershoot) >2.3 V at VCC = 3.3 V, TA = 25°C Support Mixed-Mode Voltage Operation on All Ports GND D D Ioff Supports Partial-Power-Down Mode NC − No internal connection description/ordering information These quadruple 2-input positive-AND gates are designed for 2-V to 5.5-V VCC operation. The ’LV08A devices perform the Boolean function Y + A • B or Y + A ) B in positive logic. These devices are fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs, preventing damaging current backflow through the devices when they are powered down. ORDERING INFORMATION QFN − RGY SN74LV08ARGYR Tube of 50 SN74LV08AD Reel of 2500 SN74LV08ADR SOP − NS Reel of 2000 SN74LV08ANSR 74LV08A SSOP − DB Reel of 2000 SN74LV08ADBR LV08A Tube of 90 SN74LV08APW Reel of 2000 SN74LV08APWR TSSOP − PW −55°C −55 C to 125 125°C C TOP-SIDE MARKING Reel of 1000 SOIC − D −40°C −40 C to 85 85°C C ORDERABLE PART NUMBER PACKAGE† TA LV08A LV08A LV08A Reel of 250 SN74LV08APWT TVSOP − DGV Reel of 2000 SN74LV08ADGVR LV08A CDIP − J Tube of 25 SNJ54LV08AJ SNJ54LV08AJ CFP − W Tube of 150 SNJ54LV08AW SNJ54LV08AW LCCC − FK Tube of 55 SNJ54LV08AFK SNJ54LV08AFK † Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at www.ti.com/sc/package. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. Copyright 2005, Texas Instruments Incorporated !"#$% !%&% ' %()#&% !"))$% & ( *"+,!&% &$- )"! !%()# *$!(!&% *$) $ $)# ( $.& %)"#$% &%&) /&))&%0)"!% *)!$%1 $ % %$!$&),0 %!,"$ $%1 ( &,, *&)&#$$)POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 1 SCLS387K − SEPTEMBER 1997 − REVISED APRIL 2005 FUNCTION TABLE (each gate) INPUTS A B OUTPUT Y H H H L X L X L L logic diagram, each gate (positive logic) A Y B absolute maximum ratings over operating free-air temperature range (unless otherwise noted)† Supply voltage range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to 7 V Input voltage range, VI (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to 7 V Voltage range applied to any output in the high-impedance or power-off state, VO (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to 7 V Output voltage range, VO (see Notes 1 and 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.5 V to VCC + 0.5 V Input clamp current, IIK (VI < 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −20 mA Output clamp current, IOK (VO < 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −50 mA Continuous output current, IO (VO = 0 to VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±25 mA Continuous current through VCC or GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±50 mA Package thermal impedance, θJA (see Note 3): D package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86°C/W (see Note 3): DB package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96°C/W (see Note 3): DGV package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127°C/W (see Note 3): NS package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76°C/W (see Note 3): PW package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113°C/W (see Note 4): RGY package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47°C/W Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65°C to 150°C † Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. NOTES: 1. The input and output negative-voltage ratings may be exceeded if the input and output current ratings are observed. 2. This value is limited to 5.5 V maximum. 3. The package thermal impedance is calculated in accordance with JESD 51-7. 4. The package thermal impedance is calculated in accordance with JESD 51-5. 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 SCLS387K − SEPTEMBER 1997 − REVISED APRIL 2005 recommended operating conditions (see Note 5) SN54LV08A VCC MIN MAX 2 5.5 Supply voltage VIH VCC = 2 V VCC = 2.3 V to 2.7 V High-level input voltage VIL Low-level input voltage VI VO Input voltage VCC = 3 V to 3.6 V VCC = 4.5 V to 5.5 V IOL ∆t/∆v 5.5 VCC × 0.7 VCC × 0.7 VCC × 0.7 VCC × 0.7 UNIT V V 0.5 0.5 VCC × 0.3 VCC × 0.3 VCC × 0.3 VCC × 0.3 VCC × 0.3 5.5 0 0 0 VCC −50 VCC = 2 V VCC = 2.3 V to 2.7 V V VCC −50 µA 0 V −2 −6 −6 −12 −12 VCC = 2 V VCC = 2.3 V to 2.7 V 50 50 2 2 VCC = 3 V to 3.6 V VCC = 4.5 V to 5.5 V 6 6 12 12 200 200 100 100 20 20 VCC = 2.3 V to 2.7 V VCC = 3 V to 3.6 V VCC = 4.5 V to 5.5 V V VCC × 0.3 5.5 −2 VCC = 3 V to 3.6 V VCC = 4.5 V to 5.5 V Input transition rise or fall rate 2 VCC × 0.7 VCC × 0.7 VCC = 3 V to 3.6 V VCC = 4.5 V to 5.5 V Low-level output current MAX 1.5 VCC = 2 V VCC = 2.3 V to 2.7 V High-level output current MIN 1.5 Output voltage IOH SN74LV08A mA µA mA ns/V TA Operating free-air temperature −55 125 −40 85 °C NOTE 5: All unused inputs of the device must be held at VCC or GND to ensure proper device operation. Refer to the TI application report, Implications of Slow or Floating CMOS Inputs, literature number SCBA004. electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) SN54LV08A PARAMETER VOH VOL TEST CONDITIONS IOH = −50 µA IOH = −2 mA IOL = 6 mA IOL = 12 mA Ioff VI or VO = 0 to 5.5 V Ci VI = VCC or GND IO = 0 TYP SN74LV08A MAX MIN VCC−0.1 2 VCC−0.1 2 3V 2.48 2.48 4.5 V 3.8 2.3 V IOL = 50 µA IOL = 2 mA VI = 5.5 V or GND VI = VCC or GND, MIN 2 V to 5.5 V IOH = −6 mA IOH = −12 mA II ICC VCC TYP MAX UNIT V 3.8 2 V to 5.5 V 0.1 0.1 2.3 V 0.4 0.4 3V 0.44 0.44 4.5 V V 0.55 0.55 0 to 5.5 V ±1 ±1 µA 5.5 V 20 20 µA 0 5 5 µA 3.3 V 3.3 3.3 5V 3.3 3.3 pF ' %()#&% !%!$)% *)"! % $ ()#&2$ ) $1% *&$ ( $2$,*#$%- '&)&!$)! && &% $) *$!(!&% &)$ $1% 1&,- $.& %)"#$% )$$)2$ $ )1 !&%1$ ) !%%"$ $$ *)"! /" %!$- POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 3 SCLS387K − SEPTEMBER 1997 − REVISED APRIL 2005 switching characteristics over recommended operating free-air temperature range, VCC = 2.5 V ± 0.2 V (unless otherwise noted) (see Figure 1) PARAMETER FROM (INPUT) TO (OUTPUT) tpd A or B Y LOAD CAPACITANCE MIN TA = 25°C TYP MAX SN54LV08A SN74LV08A MIN MAX MIN MAX CL = 15 pF 7.9* 13.8* 1* 17* 1 16 CL = 50 pF 10.5 17.3 1 21 1 20 UNIT ns * On products compliant to MIL-PRF-38535, this parameter is not production tested. switching characteristics over recommended operating free-air temperature range, VCC = 3.3 V ± 0.3 V (unless otherwise noted) (see Figure 1) PARAMETER FROM (INPUT) TO (OUTPUT) tpd A or B Y LOAD CAPACITANCE TA = 25°C MIN TYP MAX CL = 15 pF 5.6* CL = 50 pF 7.5 SN54LV08A SN74LV08A MIN MAX MIN MAX 8.8* 1* 11.5* 1 10.5 12.3 1 15 1 14 UNIT ns * On products compliant to MIL-PRF-38535, this parameter is not production tested. switching characteristics over recommended operating free-air temperature range, VCC = 5 V ± 0.5 V (unless otherwise noted) (see Figure 1) PARAMETER FROM (INPUT) TO (OUTPUT) tpd A or B Y LOAD CAPACITANCE MIN TA = 25°C TYP MAX SN54LV08A SN74LV08A MIN MAX MIN MAX CL = 15 pF 4.1* 5.9* 1* 8* 1 7 CL = 50 pF 5.5 7.9 1 10 1 9 UNIT ns * On products compliant to MIL-PRF-38535, this parameter is not production tested. noise characteristics, VCC = 3.3 V, CL = 50 pF, TA = 25°C (see Note 6) SN74LV08A PARAMETER MIN TYP MAX UNIT VOL(P) VOL(V) Quiet output, maximum dynamic VOL 0.2 0.8 V Quiet output, minimum dynamic VOL −0.1 −0.8 V VOH(V) VIH(D) Quiet output, minimum dynamic VOH 3.1 High-level dynamic input voltage V 2.31 V VIL(D) Low-level dynamic input voltage NOTE 6: Characteristics are for surface-mount packages only. 0.99 V VCC 3.3 V TYP UNIT 5V 10 operating characteristics, TA = 25°C PARAMETER Cpd Power dissipation capacitance TEST CONDITIONS CL = 50 pF, ' %()#&% !%!$)% *)"! % $ ()#&2$ ) $1% *&$ ( $2$,*#$%- '&)&!$)! && &% $) *$!(!&% &)$ $1% 1&,- $.& %)"#$% )$$)2$ $ )1 !&%1$ ) !%%"$ $$ *)"! /" %!$- 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 f = 10 MHz 8 pF SCLS387K − SEPTEMBER 1997 − REVISED APRIL 2005 PARAMETER MEASUREMENT INFORMATION From Output Under Test RL = 1 kΩ From Output Under Test Test Point VCC Open S1 TEST GND CL (see Note A) CL (see Note A) S1 tPLH/tPHL tPLZ/tPZL tPHZ/tPZH Open Drain Open VCC GND VCC LOAD CIRCUIT FOR 3-STATE AND OPEN-DRAIN OUTPUTS LOAD CIRCUIT FOR TOTEM-POLE OUTPUTS VCC 50% VCC Timing Input 0V tw tsu VCC 50% VCC Input 50% VCC th VCC 50% VCC Data Input 50% VCC 0V 0V VOLTAGE WAVEFORMS PULSE DURATION VOLTAGE WAVEFORMS SETUP AND HOLD TIMES VCC 50% VCC Input 50% VCC tPLH In-Phase Output 50% VCC VOH 50% VCC VOL VOH 50% VCC VOL VOLTAGE WAVEFORMS PROPAGATION DELAY TIMES INVERTING AND NONINVERTING OUTPUTS 50% VCC 0V Output Waveform 1 S1 at VCC (see Note B) tPLH 50% VCC 50% VCC tPLZ tPZL tPHL tPHL Out-of-Phase Output 0V VCC Output Control ≈VCC 50% VCC tPHZ tPZH Output Waveform 2 S1 at GND (see Note B) VOL + 0.3 V VOL 50% VCC VOH − 0.3 V VOH ≈0 V VOLTAGE WAVEFORMS ENABLE AND DISABLE TIMES LOW- AND HIGH-LEVEL ENABLING NOTES: A. CL includes probe and jig capacitance. B. Waveform 1 is for an output with internal conditions such that the output is low, except when disabled by the output control. Waveform 2 is for an output with internal conditions such that the output is high, except when disabled by the output control. C. All input pulses are supplied by generators having the following characteristics: PRR ≤ 1 MHz, ZO = 50 Ω, tr ≤ 3 ns, tf ≤ 3 ns. D. The outputs are measured one at a time, with one input transition per measurement. E. tPLZ and tPHZ are the same as tdis. F. tPZL and tPZH are the same as ten. G. tPHL and tPLH are the same as tpd. H. All parameters and waveforms are not applicable to all devices. Figure 1. Load Circuit and Voltage Waveforms POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 5 PACKAGE OPTION ADDENDUM www.ti.com 6-Dec-2006 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing Pins Package Eco Plan (2) Qty SN74LV08AD ACTIVE SOIC D 14 SN74LV08ADBLE OBSOLETE SSOP DB 14 SN74LV08ADBR ACTIVE SSOP DB 14 2000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN74LV08ADBRE4 ACTIVE SSOP DB 14 2000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN74LV08ADE4 ACTIVE SOIC D 14 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN74LV08ADGVR ACTIVE TVSOP DGV 14 2000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN74LV08ADGVRE4 ACTIVE TVSOP DGV 14 2000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN74LV08ADR ACTIVE SOIC D 14 2500 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN74LV08ADRE4 ACTIVE SOIC D 14 2500 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN74LV08ANSR ACTIVE SO NS 14 2000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN74LV08ANSRE4 ACTIVE SO NS 14 2000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN74LV08ANSRG4 ACTIVE SO NS 14 2000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN74LV08APW ACTIVE TSSOP PW 14 90 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN74LV08APWE4 ACTIVE TSSOP PW 14 90 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN74LV08APWG4 ACTIVE TSSOP PW 14 90 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN74LV08APWLE OBSOLETE TSSOP PW 14 SN74LV08APWR ACTIVE TSSOP PW 14 2000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN74LV08APWRE4 ACTIVE TSSOP PW 14 2000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN74LV08APWRG4 ACTIVE TSSOP PW 14 2000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN74LV08APWT ACTIVE TSSOP PW 14 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN74LV08APWTE4 ACTIVE TSSOP PW 14 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM SN74LV08ARGYR ACTIVE QFN RGY 14 1000 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1YEAR SN74LV08ARGYRG4 ACTIVE QFN RGY 14 50 Green (RoHS & no Sb/Br) TBD 50 TBD (1) TBD Lead/Ball Finish CU NIPDAU Call TI Call TI Call TI MSL Peak Temp (3) Level-1-260C-UNLIM Call TI Call TI Call TI The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. Addendum-Page 1 PACKAGE OPTION ADDENDUM www.ti.com 6-Dec-2006 OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release. In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis. Addendum-Page 2 MECHANICAL DATA MPDS006C – FEBRUARY 1996 – REVISED AUGUST 2000 DGV (R-PDSO-G**) PLASTIC SMALL-OUTLINE 24 PINS SHOWN 0,40 0,23 0,13 24 13 0,07 M 0,16 NOM 4,50 4,30 6,60 6,20 Gage Plane 0,25 0°–8° 1 0,75 0,50 12 A Seating Plane 0,15 0,05 1,20 MAX PINS ** 0,08 14 16 20 24 38 48 56 A MAX 3,70 3,70 5,10 5,10 7,90 9,80 11,40 A MIN 3,50 3,50 4,90 4,90 7,70 9,60 11,20 DIM 4073251/E 08/00 NOTES: A. B. C. D. All linear dimensions are in millimeters. This drawing is subject to change without notice. Body dimensions do not include mold flash or protrusion, not to exceed 0,15 per side. Falls within JEDEC: 24/48 Pins – MO-153 14/16/20/56 Pins – MO-194 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 MECHANICAL DATA MSSO002E – JANUARY 1995 – REVISED DECEMBER 2001 DB (R-PDSO-G**) PLASTIC SMALL-OUTLINE 28 PINS SHOWN 0,38 0,22 0,65 28 0,15 M 15 0,25 0,09 8,20 7,40 5,60 5,00 Gage Plane 1 14 0,25 A 0°–ā8° 0,95 0,55 Seating Plane 2,00 MAX 0,10 0,05 MIN PINS ** 14 16 20 24 28 30 38 A MAX 6,50 6,50 7,50 8,50 10,50 10,50 12,90 A MIN 5,90 5,90 6,90 7,90 9,90 9,90 12,30 DIM 4040065 /E 12/01 NOTES: A. B. C. D. All linear dimensions are in millimeters. This drawing is subject to change without notice. Body dimensions do not include mold flash or protrusion not to exceed 0,15. Falls within JEDEC MO-150 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 MECHANICAL DATA MTSS001C – JANUARY 1995 – REVISED FEBRUARY 1999 PW (R-PDSO-G**) PLASTIC SMALL-OUTLINE PACKAGE 14 PINS SHOWN 0,30 0,19 0,65 14 0,10 M 8 0,15 NOM 4,50 4,30 6,60 6,20 Gage Plane 0,25 1 7 0°– 8° A 0,75 0,50 Seating Plane 0,15 0,05 1,20 MAX PINS ** 0,10 8 14 16 20 24 28 A MAX 3,10 5,10 5,10 6,60 7,90 9,80 A MIN 2,90 4,90 4,90 6,40 7,70 9,60 DIM 4040064/F 01/97 NOTES: A. B. C. D. All linear dimensions are in millimeters. This drawing is subject to change without notice. Body dimensions do not include mold flash or protrusion not to exceed 0,15. Falls within JEDEC MO-153 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. 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