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Technical content
- General description 74HC423; 74HCT423 are high-speed Si-gate CMOS devices that are pin compatible with Low power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard no. 7A. The 74HC423; 74HCT423 dual retriggerable monostable multivibrator with reset has two methods of output pulse width control. 1. The minimum pulse width is essentially dete rmined by the selection of an external resistor (REXT) and capacitor (CEXT), see Section 12.1. 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. When nRD is LOW, it forces the nQ output LOW, the nQ output HIGH and also inhibits the triggering. Figure 10 and Figure 11 illustrate pulse control by reset. The nA and nB inputs’ Schmitt trigger action makes them highly tolerant to slower input rise and fall times. The 74HC423; 74HCT423 are identical to the 74HC123; 74HCT123 except that they cannot be triggered via the reset input. 2. Features and benefits DC triggered from active HIGH or active LOW inputs Retriggerable for very long pulses up to 100 % duty factor Direct reset terminates output pulse Schmitt-trigger action on all inputs except for the reset input Complies with JEDEC standard no. 7A ESD protection: HBM JESD22-A114F exceeds 2000 V MM JESD22-A115-A exceeds 200 V Specified from 40 Ct o+ 8 5C and from 40 Ct o+ 1 2 5C 74HC423; 74HCT423 Dual retriggerable monostable multivibrator with reset Rev. 6 — 19 December 2011 Product data sheet
Table 1. Ordering information
Product data sheet Rev. 6 — 19 December 2011 3 of 24 NXP Semiconductors 74HC423; 74HCT423 Dual retriggerable monostable multivibrator with reset Fig 2. Logic symbol Fig 3. IEC Logic symbol Q S 2REXT/CEXT 1REXT/CEXT 15 2CEXT 6 1CEXT 14 2Q 5 Q 2Q 12 001aah797 11 A 10 2B 21 B T 3 1RD 11 2RD RD 001aah798 CX RCX R CX RCX R Fig 4. Logic diagram 001aah799 REXT/CEXT VCC VCC VCC RD A B CL CL CL CL CL Q QR R
5.1 Pinning
5.2 Pin description
Table 2. Pin description
= one LOW level output pulse. [2] If the monostable multivibrator was triggered before this c ondition was established, the pulse will continue as programmed. [1] The input and output voltage ratings may be exceeded if the input and output current ratings are observed. [2] For DIP16 packages: above 70 C the value of Ptot derates linearly at 12 mW/K. For DHVQFN16 packages: above 60 C the value of Ptot derates linearly at 4.5 mW/K. Table 3. Function table [1] Table 4. Limiting values In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to GND (ground = 0 V).
- Recommended operating conditions
Table 5. Recommended operating conditions Voltages are referenced to GND (ground = 0 V). Table 6. Static characteristics At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Table 6. Static characteristics …continued At recommended operating conditions; voltages are referenced to GND (ground = 0 V).
Table 7. Dynamic characteristics GND = 0 V; test circuit see Figure 12.
Table 7. Dynamic characteristics …continued GND = 0 V; test circuit see Figure 12.
[1] t pd is the same as tPHL and tPLH. [2] t t is the same as tTHL and tTLH. Inherent test jig and pin capacitance at pins 15 and 7 (nREXT/CEXT) is 7 pF. extended when the time between the active-going edges of the trigger input pulses meets the minimum retrigger time. REXT = external resistor in k. Inherent test jig and pin capacitance at pins 15 and 7 (nREXT/CEXT) is 7 pF. [5] When the device is powered-up, initiate the device via a reset pulse, when C EXT < 50 pF. L VCC2 fo) = sum of outputs. GND = 0 V; test circuit see Figure 12.
Measurement points are given in Table 8. VOL and VOH are typical voltage output levels that occur with the output load. Table 8. Measurement points
Product data sheet Rev. 6 — 19 December 2011 12 of 24 NXP Semiconductors 74HC423; 74HCT423 Dual retriggerable monostable multivibrator with reset VCC = 5.0 V and Tamb = 25 C. (1) R EXT = 100 k. (2) R EXT = 50 k. (3) R EXT = 10 k. (4) R EXT = 2 k. External capacitance = 10 nF, external resistance = 10 k to 100 k and Tamb =2 5 C. Fig 8. Typical output pulse width as a function of the external capacitor values Fig 9. Typical ‘K’ factor 001aaa611 103 102 105 104 106 tW (ns) CEXT (pF) 11 0 410310 10 2 (2) (3) (4) (1) VCC (V) 08 624 001aaa612 0.4 0.2 0.6 0.8 'K' factor nRD = HIGH. Fig 10. Output pulse control using retrigger pulse (t rtrig) mna521 tW tW tW tW tW nB input nA input nQ output trtrig
Test data is given in Table 9. RT = Termination resistance should be equal to output impedance Zo of the pulse generator. CL = Load capacitance including jig and probe capacitance. Table 9. Test data
Product data sheet Rev. 6 — 19 December 2011 14 of 24 NXP Semiconductors 74HC423; 74HCT423 Dual retriggerable monostable multivibrator with reset 12. Application information
12.1 Timing component connections
The basic output pulse width is essentially determined by the values of the external timing components REXT and CEXT.
12.1.1 Minimum monostable pulse width
To set the minimum pulse width, when CEXT < 10 nF, see Figure 8 and when CEXT > 10 nF, the output pulse width is defined as: tW = 0.45 REXT CEXT (typ.), where: tW = pulse width in s; REXT = external resistor in k; CEXT = external capacitor in nF.
12.2 Power-up considerations
When the monostable 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 circuit shown in Figure 14. (1) For minimum noise generation it is recommended that the nCEXT pins (6, 14) are connected to ground externally to the GND pin (8). Fig 13. Timing component connections 001aah917 CEXT REXT nA nB VCC nCEXT nRD nREXT/CEXT nQ nQ GND 423 13 (5) 4 (12) 15 (7)14 (6) 3 (11) 1 (9) 2 (10) (1)
Product data sheet Rev. 6 — 19 December 2011 15 of 24 NXP Semiconductors 74HC423; 74HCT423 Dual retriggerable monostable multivibrator with reset
12.3 Power-down considerations
A large capacitor CEXT may cause problems when powering-down the monostable due to the capacitor’s stored energy. 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, use a damping diode DEXT preferably a germanium or Schottky type diode able to withstand large current surges and connect as shown in Figure 15. Fig 14. Power-up output pulse elimination circuit 001aah918 VCCRESET nRD CEXT REXT nA nB VCC nCEXTGND nREXT/CEXT nQ nQ 423 13 (5) 4 (12) 15 (7)14 (6)8 1 (9) 2 (10) 3 (11) Fig 15. Power-down protection circuit 001aah919 DEXT nRD CEXT REXT nA nB VCC nCEXT nREXT/CEXT nQ nQ 423 13 (5) 4 (12) 15 (7) 1 (9) 2 (10) 3 (11) GND 14 (6)8
Product data sheet Rev. 6 — 19 December 2011 16 of 24 NXP Semiconductors 74HC423; 74HCT423 Dual retriggerable monostable multivibrator with reset 13. Package outline Fig 16. 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. 6 — 19 December 2011 17 of 24 NXP Semiconductors 74HC423; 74HCT423 Dual retriggerable monostable multivibrator with reset Fig 17. 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. 6 — 19 December 2011 18 of 24 NXP Semiconductors 74HC423; 74HCT423 Dual retriggerable monostable multivibrator with reset Fig 18. Package outline SOT763-1 (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
Product data sheet Rev. 6 — 19 December 2011 19 of 24 NXP Semiconductors 74HC423; 74HCT423 Dual retriggerable monostable multivibrator with reset Fig 19. 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. 6 — 19 December 2011 20 of 24 NXP Semiconductors 74HC423; 74HCT423 Dual retriggerable monostable multivibrator with reset Fig 20. 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
Table 10. Abbreviations Table 11. Revision history
- Legal pages updated. 74HC_HCT423 v.5 20110825 Product data sheet - 74HC_HCT423 v.4 74HC_HCT423 v.4 20110318 Product data sheet - 74HC_HCT423 v.3 74HC_HCT423 v.3 20080724 Product data sheet - 74HC_HCT423_CNV v.2 74HC_HCT423_CNV v.2 19980708 Product specification - -
Product data sheet Rev. 6 — 19 December 2011 22 of 24 NXP Semiconductors 74HC423; 74HCT423 Dual retriggerable monostable multivibrator with reset 16. Legal information
16.1 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.
16.2 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.
16.3 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. 6 — 19 December 2011 23 of 24 NXP Semiconductors 74HC423; 74HCT423 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.
16.4 Trademarks
Notice: All referenced brands, product names, service names and trademarks are the property of their respective owners. 17. 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 74HC423; 74HCT423 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: 19 December 2011 Document identifier: 74HC_HCT423 Please be aware that important notices concerning this document and the product(s) described herein, have been included in section ‘Legal information’. 18. Contents