SN54AHC123A, SN74AHC123A DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS SCLS352F - JULY 1997 - REVISED AUGUST 2000 D D D D D D D D D EPIC (Enhanced-Performance Implanted CMOS) Process Operating Range 2-V to 5.5-V VCC Schmitt-Trigger Circuitry On A, B, and CLR Inputs for Slow Input Transition Rates Edge Triggered From Active-High or Active-Low Gated Logic Inputs Retriggerable for Very Long Output Pulses Overriding Clear Terminates Output Pulse Glitch-Free Power-Up Reset On Outputs Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II ESD Protection Exceeds JESD 22 - 2000-V Human-Body Model (A114-A) - 200-V Machine Model (A115-A) - 1000-V Charged-Device Model (C101) Package Options Include Plastic Small-Outline (D), Shrink Small-Outline (DB), Thin Very Small-Outline (DGV), Thin Shrink Small-Outline (PW), and Ceramic Flat (W) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) DIPs SN54AHC123A . . . J OR W PACKAGE SN74AHC123A . . . D, DB, DGV, N, OR PW PACKAGE (TOP VIEW) 1A 1B 1CLR 1Q 2Q 2Cext 2Rext/Cext GND 1 16 2 15 3 14 4 13 5 12 6 11 7 10 8 9 VCC 1Rext/Cext 1Cext 1Q 2Q 2CLR 2B 2A SN54AHC123A . . . FK PACKAGE (TOP VIEW) 1B 1A NC VCC 1R ext /C ext D 1CLR 1Q NC 2Q 2Cext 3 2 1 20 19 18 5 17 6 16 7 15 8 14 9 10 11 12 13 1Cext 1Q NC 2Q 2CLR 2R ext /Cext GND NC 2A 2B description 4 The 'AHC123A devices are dual retriggerable monostable multivibrators designed for 2-V to 5.5-V VCC operation. NC - No internal connection These edge-triggered multivibrators feature output pulse-duration control by three methods. In the first method, the A input is low, and the B input goes high. In the second method, the B input is high, and the A input goes low. In the third method, the A input is low, the B input is high, and the clear (CLR) input goes high. The output pulse duration is programmed by selecting external resistance and capacitance values. The external timing capacitor must be connected between Cext and Rext/Cext (positive) and an external resistor connected between Rext/Cext and VCC. To obtain variable pulse durations, connect an external variable resistance between Rext/Cext and VCC. The output pulse duration also can be reduced by taking CLR low. Pulse triggering occurs at a particular voltage level and is not directly related to the transition time of the input pulse. The A, B, and CLR inputs have Schmitt triggers with sufficient hysteresis to handle slow input transition rates with jitter-free triggering at the outputs. Once triggered, the basic pulse duration can be extended by retriggering the gated low-level-active (A) or high-level-active (B) input. Pulse duration can be reduced by taking CLR low. CLR input can be used to override A or B inputs. The input/output timing diagram illustrates pulse control by retriggering the inputs and early clearing. 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. EPIC is a trademark of Texas Instruments Incorporated. Copyright 2000, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. On products compliant to MIL-PRF-38535, all parameters are tested unless otherwise noted. On all other products, production processing does not necessarily include testing of all parameters. POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 1 SN54AHC123A, SN74AHC123A DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS SCLS352F - JULY 1997 - REVISED AUGUST 2000 description (continued) The variance in output pulse duration from device to device typically is less than 0.5% for given external timing components. An example of this distribution for the 'AHC123A is shown in Figure 10. Variations in output pulse duration versus supply voltage and temperature are shown in Figure 6. During power up, Q outputs are in the low state, and Q outputs are in the high state. The outputs are glitch free, without applying a reset pulse. The SN54AHC123A is characterized for operation over the full military temperature range of -55C to 125C. The SN74AHC123A is characterized for operation from -40C to 85C. For additional application information on multivibrators, see the application report Designing With The SN74AHC123A and SN74AHCT123A, literature number SCLA014. FUNCTION TABLE (each multivibrator) INPUTS CLR OUTPUTS A B Q Q L L L H H L X X X H X X X L H L H # H H L H These outputs are based on the assumption that the indicated steady-state conditions at the A and B inputs have been set up long enough to complete any pulse started before the setup. logic symbol 1A 1B 1 & 2 13 1CLR 3 R 14 1Cext 15 1Rext/Cext 2A 2B 1Q CX RX/CX 9 & 10 5 11 2CLR 2Cext 2Rext/Cext 6 7 12 R CX RX/CX This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12. Pin numbers shown are for the D, DB, DGV, J, N, PW, and W packages. 2 1Q 4 POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 2Q 2Q SN54AHC123A, SN74AHC123A DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS SCLS352F - JULY 1997 - REVISED AUGUST 2000 logic diagram, each multivibrator (positive logic) Rext/Cext A Cext B Q CLR R Q input/output timing diagram trr A B CLR Rext/Cext Q Q tw tw POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 tw + trr 3 SN54AHC123A, SN74AHC123A DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS SCLS352F - JULY 1997 - REVISED AUGUST 2000 absolute maximum ratings over operating free-air temperature (unless otherwise noted) Supply voltage range, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5 V to 7 V Input voltage range, VI (see Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5 V to 7 V Output voltage range in high or low state, VO (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . -0.5 V to VCC + 0.5 V Output voltage range in power-off state, VO (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5 V to 7 V Input clamp current, IIK (VI < 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -20 mA Output clamp current, IOK (VO < 0 or VO > VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA Continuous output current, IO (VO = 0 to VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 mA Continuous current through VCC or GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 mA Package thermal impedance, JA (see Note 3): D package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73C/W DB package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82C/W DGV package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120C/W N package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67C/W PW package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108C/W Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65C to 150C 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. Voltage values are with respect to the network ground terminal. 2. The input and output voltage ratings may be exceeded if the input and output current ratings are observed. 3. The package thermal impedance is calculated in accordance with JESD 51. recommended operating conditions (see Note 4) SN54AHC123A VCC Supply voltage VIH High-level input voltage VCC = 2 V VCC = 3 V VCC = 5.5 V VCC = 2 V VIL Low-level input voltage SN74AHC123A MIN MAX MIN MAX 2 5.5 2 5.5 1.5 V 1.5 2.1 2.1 3.85 3.85 0.5 VCC = 3 V VCC = 5.5 V UNIT V 0.5 0.9 0.9 1.65 1.65 V VI VO Input voltage 0 5.5 0 5.5 V Output voltage 0 VCC -50 0 VCC -50 V IOH High-level output current VCC = 2 V VCC = 3.3 V 0.3 V VCC = 5 V 0.5 V VCC = 2 V IOL Rextt t/VCC TA Low-level output current External timing resistance VCC = 3.3 V 0.3 V VCC = 5 V 0.5 V VCC = 2 V VCC > 3 V Power-up ramp rate Operating free-air temperature -4 -4 -8 -8 50 50 4 4 8 8 5k 5k 1k 1k 1 1 -55 125 -40 mA mA mA mA ms/V 85 C NOTE 4: 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. 4 POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 SN54AHC123A, SN74AHC123A DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS SCLS352F - JULY 1997 - REVISED AUGUST 2000 electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER TEST CONDITIONS IOH = -50 mA VOH IOH = -4 mA IOH = -8 mA IOL = 50 mA VOL VCC TA = 25C TYP MAX SN54AHC123A MIN MIN MAX SN74AHC123A MIN 2V 1.9 2 1.9 1.9 3V 2.9 3 2.9 2.9 4.5 V 4.4 4.5 4.4 4.4 3V 2.58 2.48 2.48 4.5 V 3.94 3.8 MAX V 3.8 2V 0.1 0.1 0.1 0.1 3V 0.1 0.1 4.5 V 0.1 0.1 0.1 3V 0.36 0.5 0.44 IOL = 4 mA IOL = 8 mA 4.5 V 0.36 0.5 0.44 Rext/Cext VI = VCC or GND 5.5 V 0.25 2.5 2.5 A, B, and CLR VI = VCC or GND 0 V to 5.5 V 0.1 1* 1 ICC Quiescent VI = VCC or GND, 4 40 40 ICC Active A ti state t t ((per er circuit) VI = VCC or GND, GND Rext/Cext = 0 0.5 5 VCC II IO = 0 5.5 V UNIT 3V 160 250 280 280 4.5 V 280 500 650 650 5.5 V 360 750 975 975 Ci VI = VCC or GND 5V 1.9 10 * On products compliant to MIL-PRF-38535, this parameter is not production tested at VCC = 0 V. This test is performed with the terminal in the off-state condition. 10 V mA mA mA pF timing requirements over recommended operating free-air temperature range, VCC = 3.3 V 0.3 V (unless otherwise noted) (see Figure 1) TEST CONDITIONS MIN TA = 25C TYP MAX SN54AHC123A MIN MAX SN74AHC123A MIN CLR 5 5 5 A or B trigger 5 76 5 5 1.8 tw Pulse duration trr Pulse retrigger time Rext = 1 k, Cext = 100 pF Rext = 1 k, Cext = 0.01 mF See retriggering data in the application information section. MAX UNIT ns ns ms timing requirements over recommended operating free-air temperature range, VCC = 5 V 0.5 V (unless otherwise noted) (see Figure 1) TEST CONDITIONS MIN TA = 25C TYP MAX SN54AHC123A MIN MAX SN74AHC123A MIN CLR 5 5 5 A or B trigger 5 59 5 5 1.5 tw Pulse duration trr Pulse retrigger time Rext = 1 k, Cext = 100 pF Rext = 1 k, Cext = 0.01 mF See retriggering data in the application information section. POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 MAX UNIT ns ns ms 5 SN54AHC123A, SN74AHC123A DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS SCLS352F - JULY 1997 - REVISED AUGUST 2000 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) TEST CONDITIONS tPLH tPHL A or B Q or Q CL = 15 pF tPLH tPHL CLR Q or Q CL = 15 pF tPLH tPHL CLR trigger Q or Q CL = 15 pF tPLH tPHL A or B Q or Q CL = 50 pF tPLH tPHL CLR Q or Q CL = 50 pF tPLH tPHL CLR trigger Q or Q CL = 50 pF Q or Q CL = 50 pF, Cext = 28 pF, Rext = 2 k CL = 50 pF, Cext = 0.01 F, Rext = 10 k CL = 50 pF, Cext = 0.1 F, Rext = 10 k tw tw MIN TA = 25C TYP MAX MAX MIN MAX 9.5* 20.6* 1* 24* 1 24 20.6* 1* 24* 1 24 7.5* 15.8* 1* 18.5* 1 18.5 9.3* 15.8* 1* 18.5* 1 18.5 10* 22.4* 1* 26* 1 26 10.6* 22.4* 1* 26* 1 26 10.5 24.1 1 27.5 1 27.5 11.8 24.1 1 27.5 1 27.5 8.9 19.3 1 22 1 22 10.5 19.3 1 22 1 22 11 25.9 1 29.5 1 29.5 12.3 25.9 1 29.5 1 29.5 182 240 90 100 110 90 110 0.9 1 1.1 0.9 1.1 1 POST OFFICE BOX 655303 SN74AHC123A MIN 10.2* * On products compliant to MIL-PRF-38535, this parameter is not production tested. tw = Pulse duration at Q and Q outputs tw = Output pulse-duration variation (Q and Q) between circuits in same package 6 SN54AHC123A * DALLAS, TEXAS 75265 300 UNIT ns ns ns ns ns ns 300 ns 90 110 ms 0.9 1.1 ms % SN54AHC123A, SN74AHC123A DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS SCLS352F - JULY 1997 - REVISED AUGUST 2000 switching characteristics over recommended operating free-air temperature range, VCC = 5 V 0.5 V (unless otherwise noted) (see Figure 1) PARAMETER FROM (NPUT) TO (OUTPUT) TEST CONDITIONS tPLH tPHL A or B Q or Q CL = 15 pF tPLH tPHL CLR Q or Q CL = 15 pF tPLH tPHL CLR trigger Q or Q CL = 15 pF tPLH tPHL A or B Q or Q CL = 50 pF tPLH tPHL CLR Q or Q CL = 50 pF tPLH tPHL CLR trigger Q or Q CL = 50 pF Q or Q CL = 50 pF, Cext = 28 pF, Rext = 2 k CL = 50 pF, Cext = 0.01 F, Rext = 10 k CL = 50 pF, Cext = 0.1 F, Rext = 10 k tw tw MIN TA = 25C TYP MAX SN54AHC123A SN74AHC123A MIN MAX MIN MAX 6.5* 12* 1* 14* 1 14 7.1* 12* 1* 14* 1 14 5.3* 9.4* 1* 11* 1 11 6.5* 9.4* 1* 11* 1 11 6.9* 12.9* 1* 15* 1 15 7.4* 12.9* 1* 15* 1 15 7.3 14 1 16 1 16 8.3 14 1 16 1 16 6.3 11.4 1 13 1 13 7.4 11.4 1 13 1 13 7.6 14.9 1 17 1 17 8.7 14.9 1 17 1 17 167 200 90 100 110 90 110 0.9 1 1.1 0.9 1.1 240 UNIT ns ns ns ns ns ns 240 ns 90 110 ms 0.9 1.1 ms 1 % * On products compliant to MIL-PRF-38535, this parameter is not production tested. tw = Pulse duration at Q and Q outputs tw = Output pulse-duration variation (Q and Q) between circuits in same package operating characteristics, VCC = 5 V, TA = 25C PARAMETER Cpd TEST CONDITIONS Power dissipation capacitance No load POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 TYP 29 UNIT pF 7 SN54AHC123A, SN74AHC123A DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS SCLS352F - JULY 1997 - REVISED AUGUST 2000 PARAMETER MEASUREMENT INFORMATION From Output Under Test Test Point tw CL (see Note A) VCC Inputs or Outputs 50% VCC 50% VCC 0V LOAD CIRCUIT VOLTAGE WAVEFORMS PULSE DURATION VCC Input A (see Note B) 50% VCC 0V VCC Input B (see Note B) 50% VCC tPLH VOH In-Phase Output 0V 50% VCC In-Phase Output VOL VOH 50% VCC VOL 50% VCC Out-of-Phase Output 50% VCC VOLTAGE WAVEFORMS DELAY TIMES NOTES: A. CL includes probe and jig capacitance. B. All input pulses are supplied by generators having the following characteristics: ZO = 50 , tr C. The outputs are measured one at a time with one input transition per measurement. Figure 1. Load Circuit and Voltage Waveforms * DALLAS, TEXAS 75265 VOH 50% VCC VOL tPLH tPHL VOLTAGE WAVEFORMS DELAY TIMES POST OFFICE BOX 655303 tPHL tPLH tPHL 8 50% VCC 50% VCC 0V Out-of-Phase Output VCC Input CLR (see Note B) + 3 ns, tf + 3 ns. VOH 50% VCC VOL SN54AHC123A, SN74AHC123A DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS SCLS352F - JULY 1997 - REVISED AUGUST 2000 APPLICATION INFORMATION caution in use To prevent malfunctions due to noise, connect a high-frequency capacitor between VCC and GND, and keep the wiring between the external components and Cext and Rext/Cext terminals as short as possible. power-down considerations Large values of Cext can cause problems when powering down the 'AHC123A because of the amount of energy stored in the capacitor. When a system containing this device is powered down, the capacitor can discharge from VCC through the protection diodes at pin 2 or pin 14. Current through the input protection diodes must be limited to 30 mA; therefore, the turn-off time of the VCC power supply must not be faster than t = VCC x Cext/30 mA. For example, if VCC = 5 V and Cext = 15 pF, the VCC supply must turn off no faster than t = (5 V) x (15 pF)/30 mA = 2.5 ns. Usually, this is not a problem because power supplies are heavily filtered and cannot discharge at this rate. When a more rapid decrease of VCC to zero occurs, the 'AHC123A can sustain damage. To avoid this possibility, use external clamping diodes. output pulse duration The output pulse duration, tw, is determined primarily by the values of the external capacitance (CT) and timing resistance (RT). The timing components are connected as shown in Figure 2. VCC RT CT To Rext/Cext Terminal To Cext Terminal Figure 2. Timing-Component Connections The pulse duration is given by: tw +K RT CT (1) if CT is 1000 pF, K = 1.0 or if CT is <1000 pF, K can be determined from Figure 5 where: tw RT CT K = pulse duration in ns = external timing resistance in k = external capacitance in pF = multiplier factor Equation 1 and Figure 3 can be used to determine values for pulse duration, external resistance, and external capacitance. POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 9 SN54AHC123A, SN74AHC123A DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS SCLS352F - JULY 1997 - REVISED AUGUST 2000 APPLICATION INFORMATION retriggering data The minimum input retriggering time (tMIR) is the minimum time required after the initial signal before retriggering the input. After tMIR, the device retriggers the output. Experimentally, it also can be shown that to retrigger the output pulse, the two adjacent input signals should be tMIR apart, where tMIR = 0.30 x tw. The retrigger pulse duration is calculated as shown in Figure 3. tMIR Input tRT = tw + tPLH = (K x RT x CT) + tPLH tRT tw tPLH Output Where: tMIR = Minimum Input Retriggering Time tPLH = Propagation Delay tRT = Retrigger Time tw = Output Pulse Duration Before Retriggering Figure 3. Retrigger Pulse Duration The minimum value from the end of the input pulse to the beginning of the retriggered output should be approximately 15 ns to ensure a retriggered output. This is illustrated in Figure 4. Input tMRT Output tMRT = Minimum Time Between the End of the Second Input Pulse and the Beginning of the Retriggered Output tMRT = 15 ns Figure 4. Input/Output Requirements 10 POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 SN54AHC123A, SN74AHC123A DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS SCLS352F - JULY 1997 - REVISED AUGUST 2000 APPLICATION INFORMATION 1.00E+09 VCC = 5 V TA = 25C 1.00E+08 RT = 200k t w - Output Pulse Duration - ns 1.00E+07 RT = 150k 1.00E+06 RT = 80k 1.00E+05 RT = 10k 1.00E+04 RT = 5k 1.00E+03 1.00E+02 RT = 1k 1.00E+01 1.00E+00 1 102 10 103 104 105 106 107 CT - External Timing Capacitance - pF Figure 5. Output Pulse Duration vs External Timing Capacitance 14% Variation in Output Pulse Duration 12% 10% 8% tw = 866 ns at: VCC = 5 V RT = 10 k CT = 50 pF TA = 25C VCC = 2.5 V VCC = 3 V VCC = 3.5 V VCC = 4 V VCC = 5 V 6% VCC = 6 V VCC = 7 V 4% 2% 0% -2% -4% -6% -60 -40 -20 0 20 40 60 80 100 120 140 160 180 Temperature - C Figure 6. Variations in Output Pulse Duration vs Temperature Operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 11 SN54AHC123A, SN74AHC123A DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATORS SCLS352F - JULY 1997 - REVISED AUGUST 2000 APPLICATION INFORMATION OUTPUT PULSE-DURATION CONSTANT vs SUPPLY VOLTAGE MINIMUM TRIGGER TIME vs VCC CHARACTERISTICS 10.00 1.20 Output Pulse-Duration Constant - K t rr - Minimum Retrigger Time - s RT = 1 k TA = 25C CT = 0.01 F 1.00 CT = 1000 pF 0.10 CT = 100 pF 0.01 0 1 2 3 4 5 1.15 RT = 10 k TA = 25C tW = K x C T x R T 1.10 CT = 1000 pF 1.05 CT = 0.01 F 1.00 0.95 0.90 1.5 6 CT = 0.1 F 2 2.5 3 3.5 4 4.5 5 VCC - Supply Voltage - V VCC - Supply Voltage - V DISTRIBUTION OF UNITS vs OUTPUT PULSE DURATION CT - External Capacitor Value - F For Capacitor Values of 0.001 F or Greater, K = 1.0 (K is Independent of R) 0.0001 TA = 25C VCC = 5 V 0.00001 2.50 3.00 3.50 4.00 4.50 Multiplier Factor - K Relative Frequency of Occurance EXTERNAL CAPACITANCE vs MULTIPLIER FACTOR 1.00 1.50 2.00 6 Figure 8 Figure 7 0.001 5.5 VCC = 5 V TA = 25C CT = 50 pF RT = 10 kW Mean = 856 ns Median = 856 ns Std. Dev. = 3.5 ns -3 Std. Dev. +3 Std. Dev. Median 99% of Data Units tw - Output Pulse Duration Figure 9 Figure 10 Operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. 12 POST OFFICE BOX 655303 * DALLAS, TEXAS 75265 IMPORTANT NOTICE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, patent infringement, and limitation of liability. TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with TI's standard warranty. Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. Customers are responsible for their applications using TI components. In order to minimize risks associated with the customer's applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of TI covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. TI's publication of information regarding any third party's products or services does not constitute TI's approval, warranty or endorsement thereof. Copyright 2000, Texas Instruments Incorporated