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Technical content
- General description The 74LV123 is a low-voltage Si-gate CMOS device and is pin and function compatible with the 74HC123; 74HCT123. It is a dual retriggerable monostable multivibrator which uses three methods to control the output pulse width: 1. The basic pulse time is programmed by the selection of an external resistor (R EXT) and capacitor (CEXT). These are normally connected as shown in Figure 9. 2. Once triggered, the basic output pulse width may be extended by retriggering the gated active LOW-going edge input (nA) or the active HIGH-going edge input (nB). By repeating this process, the output pulse period (nQ = HIGH, nQ = LOW) can be made as long as desired (see Figure 12). 3. Alternatively, an output delay can be term inated at any time by a LOW-going edge on input nRD, which also inhibits the triggering (see Figure 13). Schmitt-trigger action in the nA and nB inputs makes the circuit highly tolerant of slower input rise and fall times. 2. Features and benefits Optimized for low-voltage applications: 1.0 V to 5.5 V Accepts TTL input levels between VCC = 2.7 V and VCC = 3.6 V Typical output ground bounce: < 0.8 V at VCC = 3.3 V and Tamb = 25 C Typical HIGH-level output voltage (VOH) undershoot: > 2 V at VCC = 3.3 V and Tamb = 25 C DC triggered from active HIGH or active LOW inputs Retriggerable for very long pulses up to 100 % duty factor Direct reset terminates output pulses Schmitt-trigger action on all inputs except for the reset input 74LV123 Dual retriggerable monostable multivibrator with reset Rev. 7 — 12 December 2011 Product data sheet
Table 1. Ordering information
Product data sheet Rev. 7 — 12 December 2011 3 of 24 NXP Semiconductors 74LV123 Dual retriggerable monostable multivibrator with reset Fig 3. Functional diagram 1QQ 2RD RD S 13 1REXT/CEXT15 1CEXT14 1QQ 001aaa610 1RD 11A 102B T Q RD S 2REXT/CEXT7 2CEXT6 2Q5 Q 2Q12 T
Product data sheet Rev. 7 — 12 December 2011 4 of 24 NXP Semiconductors 74LV123 Dual retriggerable monostable multivibrator with reset Fig 4. Logic diagram 001aae524 VCC nREXT/CEXT Q Q CL CL R CL CLCL VCC VCC RR RD R A B
5.1 Pinning
5.2 Pin description
Table 2. Pin description
[2] If the monostable multivibrator was triggered before this c ondition was established, the pulse will continue as programmed. Table 3. Function table [1]
[1] The input and output voltage ratings may be exceeded if the input and output current ratings are observed. [2] For DIP16 package: P tot derates linearly with 12 mW/K above 70 C. [3] For SO16 package: P tot derates linearly with 8 mW/K above 70 C. [4] For SSOP16 and TSSOP16 packages: P tot derates linearly with 5.5 mW/K above 60 C. [5] For DHVQFN16 package: P tot derates linearly with 4.5 mW/K above 60 C.
- Recommended operating conditions
[2] Except for Schmitt-trigger inputs nA and nB. Table 4. Limiting values In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to GND (ground = 0 V). Table 5. Recommended operating conditions
Table 6. Static characteristics At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
[1] All typical values are measured at T amb = 25 C. Table 6. Static characteristics …continued At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Table 7. Dynamic characteristics GND = 0 V; tr = tf 2.5 ns; for test circuit see Figure 8.
[1] All typical values are measured at T amb = 25 C and nominal supply values (VCC = 3.3 V and 5.0 V). [2] t pd is the same as tPLH and tPHL; CEXT = 0 pF; REXT =5 k. [3] For other R EXT and CEXT combinations see Figure 11 and Section 12.1.1 “Basic timing”. [5] C PD is used to determine the dynamic power dissipation (PD in W). (CL VCC2 fo) = sum of the outputs. Table 7. Dynamic characteristics …continued GND = 0 V; tr = tf 2.5 ns; for test circuit see Figure 8.
Measurement points are given in Table 8. Table 8. Measurement points Test data is given in Table 9. CL = Load capacitance including jig and probe capacitance. RT = Termination resistance should be equal to Zo of the pulse generator.
12.1 Timing components
12.1.1 Basic timing
Table 9. Test data
Product data sheet Rev. 7 — 12 December 2011 14 of 24 NXP Semiconductors 74LV123 Dual retriggerable monostable multivibrator with reset
12.1.2 Retrigger timing
The time to retrigger the monostable multivibrator depends on the values of REXT and CEXT. The output pulse width will only be extended when the time between the active going edges of the trigger pulses meets the minimum retrigger time. If CEXT > 10 pF, the next formula for the set-up time of a retrigger pulse is valid: at VCC = 3.0 V: trtrig = 41 + 0.15REXT CEXT0.9 1 REXT (typ.) where: trtrig = retrigger time in ns CEXT = external capacitor in pF REXT = external resistor in k CEXT =1 0n F ; REXT = 10 k to 100 k VCC = 3.3 V and Tamb = 25 C Fig 10. Typical ‘K’ factor as a function of VCC Fig 11. Typical output pulse width as a function of the external capacitance values 001aae529 VCC (V) 06 42 0.4 0.2 0.6 0.8 'K' factor 001aae530 103 102 105 104 106 tW (ns) Cext (pF) 11 0 410310 10 2 REXT = 100 kΩ 50 kΩ 10 kΩ 2 kΩ nRD = HIGH Fig 12. Output pulse control using retrigger pulse nA 001aae526 nB input nQ output nA input trtrig tW tW tW tW
Product data sheet Rev. 7 — 12 December 2011 15 of 24 NXP Semiconductors 74LV123 Dual retriggerable monostable multivibrator with reset
12.1.3 Reset timing
12.2 Power considerations
12.2.1 Power-up
When the monostable multivibrator is powered-up, it may produce an output pulse with a pulse width defined by the values of REXT and CEXT. This output pulse can be eliminated using the RC circuit on pin nRD shown in Figure 14.
12.2.2 Power-down
A large capacitor (CEXT) may cause problems when powering-down the monostable due to the energy stored in this capacitor. When a system containing this device is powered-down or a rapid decrease of VCC to zero occurs, the monostable may sustain damage, due to the capacitor discharging through the input protection diodes. To avoid this possibility, connect a damping diode DEXT (preferably a germanium or Schottky type diode) able to withstand large current surges - see Figure 14. nA = LOW Fig 13. Output pulse control using reset input nR D 001aae527 nB input nQ output nRD input tWtW Fig 14. Power-up and power-down circuit 001aae532 VCCRESET nRD CEXT REXT DEXT nA nB VCC nCEXTGND nREXT/CEXT nQ nQ 74LV123 13 (5) 4 (12) 15 (7)14 (6)8 1 (9) 2 (10) 3 (11)
Product data sheet Rev. 7 — 12 December 2011 16 of 24 NXP Semiconductors 74LV123 Dual retriggerable monostable multivibrator with reset 13. Package outline Fig 15. Package outline SOT38-4 (DIP16) REFERENCESOUTLINE VERSION EUROPEAN PROJECTION ISSUE DATE IEC JEDEC JEITA SOT38-4 95-01-14 03-02-13 MH c (e )1 ME A L seating plane w M e D Z E pin 1 index b 0 5 10 mm scale Note 1. Plastic or metal protrusions of 0.25 mm (0.01 inch) maximum per side are not included. UNIT A max. 12 b1 (1) (1) (1) b2 cD E e M ZHL mm DIMENSIONS (inch dimensions are derived from the original mm dimensions) A min. A max. b max.wMEe1 1.73 1.30 0.53 0.38 0.36 0.23 19.50 18.55 6.48 6.20 3.60 7.80 10.0 inches 0.068 0.051 0.021 0.015 0.014 0.009 1.25 0.85 0.049 0.033 0.77 0.73 0.26 0.24 0.14 0.31 0.39 DIP16: plastic dual in-line package; 16 leads (300 mil) SOT38-4
Product data sheet Rev. 7 — 12 December 2011 17 of 24 NXP Semiconductors 74LV123 Dual retriggerable monostable multivibrator with reset Fig 16. Package outline SOT109-1 (SO16) X w M θ AA1 bp D HE Lp Q detail X E Z e c L v M A (A )3 A y pin 1 index UNIT A max. A1 A2 A3 bp cD (1) E(1) (1)eH E LL p QZ y w v θ REFERENCESOUTLINE 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 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 0.0410.244 0.228 0.028 0.020 0.028 0.0120.01 0.25 0.01 0.0040.039 0.016 0 2.5 5 mm scale SO16: plastic small outline package; 16 leads; body width 3.9 mm SOT109-1
Product data sheet Rev. 7 — 12 December 2011 18 of 24 NXP Semiconductors 74LV123 Dual retriggerable monostable multivibrator with reset Fig 17. Package outline SOT338-1 (SSOP16) UNIT A1 A2 A3 bp cD (1) E (1) eH E LL p QZ y w v θ REFERENCESOUTLINE VERSION EUROPEAN PROJECTION ISSUE DATE IEC JEDEC JEITA mm 0.21 0.05 1.80 1.65 0.25 0.38 0.25 0.20 0.09 6.4 6.0 5.4 5.2 0.65 1.257.9 7.6 1.03 0.63 0.9 0.7 1.00 0.55 o o0.130.2 0.1 DIMENSIONS (mm are the original dimensions) Note 1. Plastic or metal protrusions of 0.25 mm maximum per side are not included. SOT338-1 99-12-27 03-02-19 (1) w M bp D HE E Z e c v M A X A y 1 8 16 9 θ AA1 Lp Q detail X L (A )3 MO-150 pin 1 index 0 2.5 5 mm scale SSOP16: plastic shrink small outline package; 16 leads; body width 5.3 mm SOT338-1 A max.
Product data sheet Rev. 7 — 12 December 2011 19 of 24 NXP Semiconductors 74LV123 Dual retriggerable monostable multivibrator with reset Fig 18. Package outline SOT403-1 (TSSOP16) UNIT A1 A2 A3 bp cD (1) E (2) (1)eH E LL p QZ y w v θ REFERENCESOUTLINE 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 o o0.13 0.10.21 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 bp D Z e 0.25 16 9 θ AA1 Lp Q detail X L (A )3 HE E c v M A XA 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
Product data sheet Rev. 7 — 12 December 2011 20 of 24 NXP Semiconductors 74LV123 Dual retriggerable monostable multivibrator with reset Fig 19. Package outline SOT736-1 (DHVQFN16) terminal 1 index area 0.51 A1 EhbUNIT ye 0.2 c REFERENCESOUTLINE VERSION EUROPEAN PROJECTION ISSUE DATE IEC JEDEC JEITA mm 3.6 3.4 Dh 2.15 1.85 2.6 2.4 1.15 0.85 2.50.30 0.18 0.05 0.00 0.05 0.1 DIMENSIONS (mm are the original dimensions) 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 c detail X yy1 Ce L Eh Dh e b 15 10 X D E C B A terminal 1 index area A C C Bv 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
Table 10. Revision history Modifications: • Legal pages updated.
Product data sheet Rev. 7 — 12 December 2011 22 of 24 NXP Semiconductors 74LV123 Dual retriggerable monostable multivibrator with reset 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 “Definitions”. [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 devices. The latest product status information is available on the Internet at URL http://www.nxp.com.
15.2 Definitions
Draft — The document is a draft version only. The content is still under internal review and subject to formal approval, which may result in modifications 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 office. In case of any inconsistency or conflict with the short data sheet, the full data sheet shall prevail. Product specification — The information and data provided in a Product data sheet shall define the specification of the product as agreed between NXP Semiconductors and its customer, unless NXP Semiconductors and customer have explicitly agreed otherwise in writing. In no event however, shall an agreement be valid in which the NXP Semiconductors product is deemed to offer functions and qualities beyond those described in the Product data sheet.
15.3 Disclaimers
Limited warranty and liability — 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. In no event shall NXP Semiconductors be liable for any indirect, incidental, punitive, special or consequential damages (including - without limitation - lost profits, lost savings, business interruption, costs related to the removal or replacement of any products or rework charges) whether or not such damages are based on tort (including negligence), warranty, breach of contract or any other legal theory. Notwithstanding any damages that customer might incur for any reason whatsoever, NXP Semiconductors’ aggregate and cumulative liability towards customer for the products described herein shall be limited in accordance with the Terms and conditions of commercial sale of NXP Semiconductors. Right to make changes — NXP Semiconductors reserves the right to make changes to information published in this document, including without limitation specifications 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 life support, life-critical or safety-critical systems or 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 customer’s 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 specified use without further testing or modification. Customers are responsible for the design and operation of their applications and products using NXP Semiconductors products, and NXP Semiconductors accepts no liability for any assistance with applications or customer product design. It is customer’s sole responsibility to determine whether the NXP Semiconductors product is suitable and fit for the customer’s applications and products planned, as well as for the planned application and use of customer’s third party customer(s). Customers should provide appropriate design and operating safeguards to minimize the risks associated with their applications and products. NXP Semiconductors does not accept any liability related to any default, damage, costs or problem which is based on any weakness or default in the customer’s applications or products, or the application or use by customer’s third party customer(s). Customer is responsible for doing all necessary testing for the customer’s applications and products using NXP Semiconductors products in order to avoid a default of the applications and the products or of the application or use by customer’s third party customer(s). NXP does not accept any liability in this respect. Limiting values — Stress above one or more limiting values (as defined in the Absolute Maximum Ratings System of IEC 60134) will cause permanent damage to the device. Limiting values are stress ratings only and (proper) operation of the device at these or any other conditions above those given in the Recommended operating conditions section (if present) or the Characteristics sections of this document is not warranted. Constant or repeated exposure to limiting values will permanently and irreversibly affect the quality and reliability of the device. Terms and conditions of commercial sale — NXP Semiconductors products are sold subject to the general terms and conditions of commercial sale, as published at http://www.nxp.com/profile/terms , unless otherwise agreed in a valid written individual agreement. In case an individual agreement is concluded only the terms and conditions of the respective agreement shall apply. NXP Semiconductors hereby expressly objects to applying the customer’s general terms and conditions with regard to the purchase of NXP Semiconductors products by customer. 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. Export control — This document as well as the item(s) described herein may be subject to export control regulations. Export might require a prior authorization from competent authorities. Document status[1][2] Product status[3] Definition Objective [short] data sheet Development This document contains data from the objective specification for product development. Preliminary [short] data sheet Qualification This document contains data from the preliminary specification. Product [short] data sheet Production This document contains the product specification.
Product data sheet Rev. 7 — 12 December 2011 23 of 24 NXP Semiconductors 74LV123 Dual retriggerable monostable multivibrator with reset Non-automotive qualified products — Unless this data sheet expressly states that this specific NXP Semiconductors product is automotive qualified, the product is not suitable for automotive use. It is neither qualified nor tested in accordance with automotive testing or application requirements. NXP Semiconductors accepts no liability for inclusion and/or use of non-automotive qualified products in automotive equipment or applications. In the event that customer uses the product for design-in and use in automotive applications to automotive specifications and standards, customer (a) shall use the product without NXP Semiconductors’ warranty of the product for such automotive applications, use and specifications, and (b) whenever customer uses the product for automotive applications beyond NXP Semiconductors’ specifications such use shall be solely at customer’s own risk, and (c) customer fully indemnifies NXP Semiconductors for any liability, damages or failed product claims resulting from customer design and use of the product for automotive applications beyond NXP Semiconductors’ standard warranty and NXP Semiconductors’ product specifications.
15.4 Trademarks
Notice: All referenced brands, product names, service names and trademarks are the property of their respective owners. 16. Contact information For more information, please visit: http://www.nxp.com For sales office addresses, please send an email to: salesaddresses@nxp.com
NXP Semiconductors 74LV123 Dual retriggerable monostable multivibrator with reset © NXP B.V. 2011. 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: 12 December 2011 Document identifier: 74LV123 Please be aware that important notices concerning this document and the product(s) described herein, have been included in section ‘Legal information’. 17. Contents