INTEGRATED CIRCUITS DATA SHEET For 4 complete data sheet, bisase also download: es The iOO8 7ahC/NCT/NCU/NCMOS Logic Farnly Specifications s The [O06 74h T/NCLYNCMOS Logic Package Information e The 106 74hCHOTNCUVNCMOS Logic Package Quilines 74HC/HCT423 Dual retriggerable monostable multivibrator with reset Product specification 1998 Jul 08 Supersedes data of December 1990 File under Integrated Circuits, ICO6 CAE ctor & PHILIPSPhilips Semiconductors Product specification Dual retriggerable monostable multivibrator with reset 74HC/HCT423 FEATURES 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 Output capability: standard (except for nReyqt/Gext) lec category: MSI GENERAL DESCRIPTION The 74HG/HCT423 are high-speed Si-gate CMOS devices and are pin compatible with low power Schottky TTL (LSTTL). They are specified in compliance with JEDEG standard no. 7A. The 74HC/HCT423 are dual retriggerable monostable multivibrators with output pulse width control by two methods. The basic pulse time is programmed by selection of an external resistor (Rex 7) and capacitor QUICK REFERENCE DATA GND =0 V; Tamb = 25 C; tp =} =6 ns (Cexr). The external resistor and capacitor are normally connected as shown in Fig.6. Once triggered, the basic output pulse width may be extended by retriggering the gated active LOW-going edge input (nA) or the active HIGH-gaing edge input (nB). By repeating this process, the output pulse period (nQ = HIGH, nQ= LOW) can be made as long as desired. When nRp is LOW, it forces the n@ output LOW, the nQ output HIGH and also inhibits the triggering. Figures 7 and 8 illustrate pulse control by reset. The basic output pulse width is essentially determined by the values of the external timing components Rey and Cex. For pulse wicths, when Cex; < 10 000 pF, see Fig.9. When Cex, > 10000 pF, the typical output pulse width is defined as: tw = 0.45 x Rext x Cext (typ.), where, ty = pulse width in ns; Rext = external resistor in kQ; Cext = external capacitor in pF. Schmitt-trigger action in the nA and nB inputs, makes the circuit highly tolerant to slower input rise and fall times. The 423 is identical to the 123 but cannot be triggered via the reset input. TYPICAL SYMBOL PARAMETER CONDITIONS UNIT Hc HCT tpue/ tpt propagation delay CL =15 pF; Vec =5V; nA, nB to nQ, nQ Rext = 5 k&; Cexr = 0 pF 25 26 ns nRp to nQ, nQ 20 22 ns C| input capacitance 3.5 3.5 pF tw minimum output pulse width nQ, nQ | notes 1 and 2 75 75 ns Notes 1. Cpp is used to determine the dynamic power dissipation (Pp in wW): Pp = Cep x Voc? x F + (CL x Veo? x fo) +0.75x Cext x Voc? x fy +Bx16x Voc where: fj = input frequency in MHz fy = output frequency in MHz D = duty factor in % E (C_ x Veo? x fp} = sum of outputs C_ = output load capacitance in pF Voc = supply voltage in V Ceyr = timing capacitance in pF For HC the condition is V, = GND to Voc For HCT the condition is V) = GND to Veg 1.5V nm 1998 Jul 08Philips Semiconductors Product specification Dual retriggerable monostable a 74HC/HCT423 multivibrator with reset ORDERING INFORMATION TYPE PACKAGE NUMBER NAME DESCRIPTION VERSION 74HC423N; DIP16 plastic dual in-line package; 16 leads (300 mil}; long body SOT38-1 74HOT423N 74HC423D; S016 plastic small outline package; 16 leads; body width 3.9 mm; SOT109-14 74HCT423D low stand-off height PIN DESCRIPTION PIN NO. SYMBOL NAME AND FUNCTION 1,9 1A, 2A trigger inputs (negative-edge triggered) 2,10 1B, 2B trigger inputs (positive-edge triggered) 3, 11 1Rp, 2Rp direct reset action (active LOW) 4,12 1Q, 2Q outputs (active LOW) 7 2Rext/Cext external resistor/capacitor connection 8 GND ground (0 V) 13,5 1Q, 2Q outputs (active HIGH} 14,6 1Ceyt, 2Cext external capacitor connection 15 1Rext/Ceyt external resistor/capacitor connection 16 Veco positive supply voltage aD U ne] Yeo qo 'Gext 14 ext rel2] fs] 1Rexr/Cext 1 428 Rext/Cext 15 1Rip [3] 14] 1S ex 9 2A [PRexr/exr 7 1a] 423 3] 10 8 a in 13 aa fiz] 20 > ta : 70s 2Cexr [6 | [11] 27g 10 26 ma, 1G_4 2Rexy/Cexr [7] [0] 28 *o a8 - 3 1Ry | cno[s [3] 22 11 2Ry 7293285 7293704 FESITIIG. 1 Fig.1 Pin configuration. Fig.2 Fig.3 IEC logic symbol. 1998 Jul 08 3Philips Semiconductors Product specification Dual retriggerable monostable wos T4HC/HCT423 multivibrator with reset q ext] 14 TRext/Cext [15 s 10 | 18 dpa Qa 1 2 ita mm, 1a] 4 Ro a |*Fo 0 2Cext| 6 2RextCext] 7 5 0 2a| 5 a 2A T 30 [28 a, 20 | 12 Ro 15 [285 7ZG3TG7 Fig.4 Functional diagram. FUNCTION TABLE INPUTS OUTPUTS nRp nA nB nQ na L x x L H x H x L() H(2) x x L L@) H(2) H L t STL LI H t H JL LI Notes 1. H =HIGH voltage level L =LOW voltage level X =don't care T = LOW-to-HIGH transition Lt = HIGH-to-LOW transition JIL =one HIGH level output pulse LIT =one LOW level output pulse 2. If the monostable was triggered before this condition was established, the pulse will continue as programmed. 1998 Jul 08Philips Semiconductors Product specification Dual retriggerable monostable multivibrator with reset 7AHC/HCT423 nAexy/Ceyr J) 7 Dees Dep Dey a [>ef>e-s PT 7z95289.3 R It is recommended to ground pins 6 (2G ey7) and 14 (1Ce_ex7) externally to pin 8 (GND). Fig.6 Logic diagram. 7Z93780 Vee Rext CExt T tonCeyt to OR eye (Ceyy {pin 14 oF &} ipin 16 ar 7} Fig.6 Timing component connections. 1998 Jul 08 5Philips Semiconductors Product specification Dual retriggerable monostable - , 74HC/HCT423 multivibrator with reset DC CHARACTERISTICS FOR 74HC For the DC characteristics see PS CAI TVHCUFPHOMOS Lagic Family Snecitioations Output capability: standard (except for nRext /Gext) log category: MS! AC CHARACTERISTICS FOR 74HC GND =0V; tf; = =6 ns; C_ = 50 pF Tamb (C) TEST CONDITIONS SYMBOL PARAMETER ae UNIT Vec| WAVEFORMS/ +25 40 to +85 | -40 to +125 (V) NOTES min. | typ. | max | min | max | min. | max. tpHi/ tpLH | propagation delay 80 | 255 320 385 |ns 2.0 | Cext =0 pF; nA, nB te nQ, nQ 29 51 B4. 77 A5 Rext = 5 kQ 23 [43 54 65 6.0 teHL/ tpLH | propagation delay 66 |215 270 325 |ns 2.0 | Cext =0 pF; nRp to n@, nQ 24 143 54 65 45 | Rext =5 kQ 19 |37 46 55 6.0 tTHL/ tty | output transition time 19 |75 95 110 ns 2.0 7 15 19 22 45 6 13 16 19 6.0 tw trigger pulse width 100 | 11 125 150 ns 2.0 | Fig.7 nA = LOW 20 |4 25 30 45 17 {3 21 26 6.0 tw trigger pulse width 100 |17 125 150 ns 2.0 | Fig.7 nB = HIGH 20 |6 25 30 45 17 [5 21 26 6.0 ty reset pulse width 100 | 14 125 150 ns 2.0 | Fig.8 nRp = LOW 20 15 25 30 45 17 14 21 26 6.0 tw output pulse width 450 = = ps 5.0 | Cext = 100 nF; nQ = HIGH Rext = 10 kQ; nQ = LOW Figs 7 and 8 ty output pulse width 75 ns 5.0 | Cexr =0 pF; nQ = HIGH Rext =5 kQ; n@ =LOW note 1; Figs 7 and& tet retrigger time 110 ns 5.0 | Cex, =0 pF; nA, nB Rext = 5 kQ2; note 2; Fig. 7 Rext external timing resistor 10 1000 | - kQ 2.0 | Fig.9 2 1000 5.0 Cex external timing capacitor | no limits pF 5.0 | Fig.9; note 3 1998 Jul 08 6Philips Semiconductors Product specification Dual retriggerable monostable multivibrator with reset 7AHC/HCT423 DC CHARACTERISTICS FOR 74HCT For the DC characteristics see 744I0HC PAMCUAICMOS Lowe Farviy Soecticagtons Output capability: standard (except for nRexq/Cexq) log category: MS! Note to HCT types The value of additional quiescent supply current (Alec) for a unit load of 1 is given in the family specifications. To determine Alcc per input, multiply this value by the unit load coefficient shown in the table below. INPUT UNIT LOAD COEFFICIENT nA, nB 0.35 nRp 0.50 AC CHARACTERISTICS FOR 74HCT GND =0 V; tf; = =6 ns; CL = 50 pF Tamb (C) TEST CONDITIONS SYMBOL | PARAMETER aer UNIT Veco | WAVEFORMS/ +25 40 to +85 | 40 to +125 (V) NOTES min. | typ. | max. | min. | max. | min. | max. tpHL/ tpLH | propagation delay 30 | 51 64 77 ns 45 | Ceyt =0 pF; nA, nB to nQ, n@ Rext = 5 kQ tpHi/ tpl | propagation delay 26 |48 60 72 ns 45 | Ceyt =0 pF; nRp to nQ@, nQ Rext = 5 kQ tro trty | output transition time 7 15 19 22 ns 45 tw trigger pulse width 20 [5 25 30 ns 45 | Fig.7 nA = LOW tw trigger pulse width 20 1/5 25 30 ns 45 | Fig? nB = HIGH tw reset pulse width 20 |7 25 30 ns 45 | Fig8 nRp = LOW tw output pulse width 450 ps 5.0 | Cext = 100 nF; nQ = HIGH Rext = 10 kQ: nQ = LOW Figs 7 and 8 ty output pulse width 75 ns 5.0 | Cex, =0 pF; nQ = HIGH Rext =5 kQ: n@ = LOW note 1; Figs 7 and 8 bet retrigger time 110 = = ns 5.0 | Cext = 0 pF; nA, nB Rext = 5 kQ; note 2; Fig.7 Rexr external timing resistor | 2 1000 | - koa 5.0 | Fig.9 Cext external timing no limits pF 5.0 | Fig.9; note 3 capacitor 1998 Jul 08 7Philips Semiconductors Product specification Dual retriggerable monostable multivibrator with reset 7AHC/HCT423 Notes 1. For other Rexy and Gex7 combinations see Fig.9. If Cex > 10 pF, the next formula is valid: tw = K x Rext x Ceyr (typ.) where: ty = output pulse width in ns; Rext = external resistor in k2; Cex7 = external capacitor in pF; K = constant = 0.45 for Vec = 5.0 V and 0.55 for Veco = 2.0 V. The inherent test jig and pin capacitance at pins 15 and 7 (nRext/Cexr) is approximately 7 pF. The time to retrigger the monostable multivibrator depends on the values of Rex7 and Cex. The output pulse width will only be extended when the time between the active-going edges of the trigger input pulses meets the minimum retrigger time. If Cext > 10 pF, the next formula (at Vcc = 5.0 V) for the set-up time of a retrigger pulse is valid: ty = 304+ 0.19 x Rex x Cex? +13x Reyr'-95 (typ.) where, ty = retrigger time in ns; Cext = external capacitor in pF; Rext = external resistor in kQ. The inherent test jig and pin capacitance at pins 15 and 7 (nRexq/Ceyq) is 7 pF. 3. When the device is powered-up, initiate the device via a reset pulse, when Cey7 < 50 pF. AC WAVEFORMS n@ INPUT 4 | ty bee nA INPUT { | ba tre _ twle rn OUTPUT i 1 | ty tw -e tw +! 7793201 Fig.7 Output pulse control using retrigger pulse; nRp = HIGH. 0B INPUT s + nig INPUT v 4 ng OUTPUT J nll 1 tw ty | 7203290 Fig.8 Output pulse control using reset input nRp; nA = LOW. 1998 Jul 08 8Philips Semiconductors Product specification Dual retriggerable monostable multivibrator with reset 7AHC/HCT423 7299293 198 (ns) +08 10* 103 103 1 10 102 103 19* CEexT (pF) Fig. Typical output pulse width as a function of the external capacitor values at Voc = 5.0 V and Tamp = 25 C. 7222167 o4 "K' factor o4 o 4 Vectvi 4 Fig.10 Typical kK factor; external capacitance = 10 nF, external resistance = 10 k& to 190 k and Tamb = 25 C. 1998 Jul 08 gPhilips Semiconductors Product specification Dual retriggerable monostable multivibrator with reset 7AHC/HCT423 APPLICATION INFORMATION Power-up considerations When the monostable is powered-up it may produce an output pulse, with a pulse width defined by the values of Ry and Cx, this output pulse can be eliminated using the circuit shown in Fig.11. Cx Ry Hho ce nCEXT aflext /Cexy TTT Tr aT 4 | | | Ht 2 8 | | r+ & | Po RESET Yec > 7222400. } Fig.11 Power-up output pulse elimination circuit. Power-down considerations A large capacitor (Cy) 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 Voc to zero occurs, the monostable may substain damage, due to the capacitor discharging through the input protection diodes. To avoid this possibility, use a damping diode (Dx) preferably a germanium or Schottky-type diode able to withstand large current surges and connect as shown in Fig.12. Oy tec cy too Ax aRexy /Caxy 7227446 Fig.12 Power-down protection circuit. 1998 Jul 08 10Philips Semiconductors Product specification Dual retriggerable monostable we Z4HC/HCT423 multivibrator with reset PACKAGE OUTLINES DIP 16: plastic dual in-line package; 16 leads (300 mil); long body SOT38-1 at DB ~ > Mp _ 5 | > oo 3 | oo 3 Ap ! g | | tt | + pot" + -__ nd pin 1 index 1 8 0 5 10mm daa scale DIMENSIONS (inch dimensions are derived from the original mm dimensions) A Ay Ao 43 1} zy UNIT | ay | omin. | mie b by c pi E! e e L Me | My w ex. 140 | 053 | 0.32 | 21.8 | 648 39 8.25 95 mm 47) O51 37 | 444 | o38 | o23 | 214 | 620 | 254 | 782 | 34 | 790 | 33 | 0754 |) 22 . 0.055 | 0.021 | 0.013 | o86 | o26 015 | 0.32 | 0.37 inches | 0.19 | 0.020] 0.15 | Kare | gois | ooog | os4 | ona | 219 | 939 | ys | ost | ggg | 201 | 0.087 Note 1. Plastic or metal protrusions of 0.25 mm maximum per side are not included. OUTLINE REFERENCES EUROPEAN VERSION PROJECTION ISSUE DATE IEC JEDEC EIAJ SOT36-1 050G09 MO-001 AE on seat 1998 Jul 08 11Philips Semiconductors Product specification Dual retriggerable monostable FAHC/HCT423 multivibrator with reset $016: plastic small outline package; 16 leads; body width 3.9 mm $SOT109-1 7 AAA AAR | 1 SY fn vies | ATM, | Ly f | iO oy Wid oo oe Lem p 0 2.5 5mm aaa! scale DIMENSIONS (inch dimensions are derived from the original mm dimensions) UNIT moe Ay | Az | As | bp e | DO! |) EM) | 2 He L Lp Q v w y | Zz) 9 mm 175 | 910 | 128 || oss fote| oe | 38 | t27| 58 1) o4 | oe 92 25/1 | 03 | ge inches | 0.089 9 4 .a| 99! [Gore acura] ace | os [2%] pase 94 bese soap 201 001 |oos| pore] Note 1. Plastic or metal protrusions of 0.15 mm maximum per side are not included. REFERENCES OUTLINE _ i _. {EUROPEAN | iesuE DATE SOT109-1 076E07S MS-012AG c0 Seon oe 12 1998 Jul 08Philips Semiconductors Product specification Dual retriggerable monostable multivibrator with reset 74HC/HCT423 SOLDERING Introduction There is no soldering method that is ideal for all IC packages. Wave soldering is often preferred when through-hole and surface mounted components are mixed on one printed-circuit board. However, wave soldering is not always suitable for surface mounted ICs, or for printed-circuits with high population densities. In these situations reflow soldering is often used. This text gives a very brief insight to a complex technology. A more in-depth account of soldering ICs can be found in our Data Handbook 1C26; Integrated Circuit Packages (order code 9398 652 90011). DIP SOLDERING BY DIPPING OR BY WAVE The maximum permissible temperature of the solder is 260 C; solder at this temperature must not be in contact with the joint for more than 5 seconds. The total contact time of successive solder waves must not exceed 5 seconds. The device may be mounted up to the seating plane, but the temperature of the plastic body must not exceed the specified maximum storage temperature (T sig max). If the printed-circuit board has been pre-heated, forced cooling may be necessary immediately after soldering to keep the temperature within the permissible limit. REPAIRING SOLDERED JOINTS Apply a low voltage soldering iron (less than 24 V) to the lead(s) of the package, below the seating plane or not more than 2 mm above it. If the temperature of the soldering iron bit is less than 300 C it may remain in contact for up to 10 seconds. If the bit temperature is between 300 and 400 C, contact may be up to 5 seconds. 1@] REFLOW SOLDERING Reflow soldering techniques are suitable for all SO packages. Reflow soldering requires solder paste (a suspension of fine solder particles, flux and binding agent) to be applied to the printed-circuit board by screen printing, stencilling or pressure-syringe dispensing before package placement. 1998 Jul 08 Several techniques exist for reflowing; for example, thermal conduction by heated belt. Dwell times vary between 50 and 300 seconds depending on heating methed. Typical reflow temperatures range from 215 to 250 C. Preheating is necessary to dry the paste and evaporate the binding agent. Preheating duration: 45 minutes at 45 C. WAVE SOLDERING Wave soldering techniques can be used for all SO packages if the following conditions are observed: A double-wave (a turbulent wave with high upward pressure followed by a smooth laminar wave) soldering technique should be used. The longitudinal axis of the package footprint must be parallel to the solder flow. The package footprint must incorporate solder thieves at the downstream end. During placement and before soldering, the package must be fixed with a droplet of adhesive. The adhesive can be applied by screen printing, pin transfer or syringe dispensing. The package can be soldered after the adhesive is cured. Maximum permissible solder temperature is 260 C, and maximum duration of package immersion in solder is 10 seconds, if cooled to less than 150 C within 6 seconds. Typical dwell time is 4 seconds at 250 C. A mildly-activated flux will eliminate the need for removal of corrosive residues in most applications. REPAIRING SOLDERED JOINTS Fix the component by first soldering two diagonally- opposite end leads. Use only a low voltage soldering iron (less than 24 V) applied to the flat part of the lead. Contact time must be limited to 10 seconds at up to 300 C. When using a dedicated tool, all other leads can be soldered in one operation within 2 to 5 seconds between 270 and 320 C.Philips Semiconductors Product specification Dual retriggerable monostable a 74HC/HCT423 multivibrator with reset DEFINITIONS Data sheet status Objective specification This data sheet contains target or goal specifications for product development. Preliminary specification This data sheet contains preliminary data; supplementary data may be published later. Product specification This data sheet contains final product specifications. Limiting values Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability. Application information Where application information is given, it is advisory and does not form part of the specification. LIFE SUPPORT APPLICATIONS These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such improper use or sale. 1998 Jul 08 14