INTEGRATED CIRCUITS 74LV123 Dual retriggerable monostable multivibrator with reset Product data Supersedes data of 1998 Apr 20 2003 Mar 13 Philips Semiconductors Product data Dual retriggerable monostable multivibrator with reset FEATURES 74LV123 DESCRIPTION * 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 VOLP (output ground bounce) < 0.8 V @ VCC = 3.3 V, The 74LV123 is a low-voltage Si-gate CMOS device and is pin and function compatible with the 74HC/HCT123. The 74LV123 is a dual retriggerable monostable multivibrator with output pulse width control by three methods. The basic pulse time is programmed by selection of an external resistor (REXT) and capacitor (CEXT). They are normally connected as shown in Figure 1. 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. Alternatively, an output delay can be terminated at any time by a LOW-going edge on input nRD, which also inhibits the triggering. Figures 1 and 2 illustrate pulse control by retriggering and early reset. The basic output pulse width is essentially determined by the values of the external timing components REXT and CEXT. For pulse width when CEXT < 10000 pF, see Figure 5. When CEXT > 10,000 pF, the typical output pulse width is defined as: tW = 0.45 x REXT x CEXT (typ.), where tW = pulse width in ns; REXT = external resistor in k; and CEXT = external capacitor in pF. Schmitt-trigger action in the nA and nB inputs makes the circuit highly tolerant of slower input rise and fall times. Tamb = 25 C * Typical VOHV (output VOH undershoot) > 2 V @ VCC = 3.3 V, 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 * Output capability: standard (except for nREXT/CEXT) * ICC category: MSI QUICK REFERENCE DATA GND = 0V; Tamb = 25C; tr = tf v2.5 ns PARAMETER SYMBOL CONDITIONS CL = 15 pF VCC = 3.3 V REXT = 5 k CEXT = 0 pF tPHL/tPLH Propagation delay nA, nB to nQ, nQ nRD to nQ, nQ CI Input capacitance CPD Power dissipation capacitance per monostable VCC = 3.3V, VI = GND to VCC1 TYPICAL UNIT 25 20 ns ns 3.5 pF 60 pF NOTES: 1. CPD is used to determine the dynamic power dissipation (PD in W) PD = CPD x VCC2 x fi x N + (CL x VCC2 x fo) where: N = number of outputs switching; fi = input frequency in MHz; CL = output load capacitance in pF; fo = output frequency in MHz; VCC = supply voltage in V; (CL x VCC2 x fo) = sum of the outputs. ORDERING INFORMATION PACKAGES TEMPERATURE RANGE ORDER CODE PKG. DWG. # 16-Pin Plastic DIL -40C to +125C 74LV123N SOT38-1 16-Pin Plastic SO -40C to +125C 74LV123D SOT109-1 16-Pin Plastic SSOP Type II -40C to +125C 74LV123DB SOT338-1 16-Pin Plastic TSSOP Type I -40C to +125C 74LV123PW SOT403-1 2003 Mar 13 2 Philips Semiconductors Product data Dual retriggerable monostable multivibrator with reset PIN CONFIGURATION 1A 1B LOGIC SYMBOL 16 1 15 2 14 1CEXT 1Q 4 13 1Q 2Q 5 12 2Q 2CEXT 6 11 2RD 2REXT/CEXT 7 10 2B 9 1,9 1A, 2A 2,10 1B, 2B 3,11 1RD, 2RD 4, 12 1Q, 2Q 7 2REXT/CEXT 15 2REXT/CEXT 7 1Q 13 2Q 5 Q 2A PIN DESCRIPTION SYMBOL 6 1REXT/CEXT S SV00096 PIN NUMBER 1 1A 9 2A 2 1B 10 2B T Q Trigger inputs (negative-edge triggered) 3 1RD 11 2RD Trigger inputs (positive-edge triggered) 4 2Q 12 SV00097 Direct reset LOW and trigger action at positive edge FUNCTIONAL DIAGRAM Outputs (active LOW) 1CEXT 14 2CEXT 6 1REXT/CEXT 15 2REXT/CEXT 7 1Q 13 2Q 5 External resistor/capacitor connection GND 13, 5 1Q, 2Q Outputs (active HIGH) 14, 6 1CEXT, 2CEXT External capacitor connection 15 1REXT/CEXT 16 VCC Ground (0V) S External resistor/capacitor connection Positive supply voltage Q LOGIC SYMBOL (IEEE/IEC) 15 1Q RD FUNCTION 8 14 14 2CEXT 1REXT/CEXT 3 8 1CEXT VCC 1RD GND 74LV123 CX RCX 1 1A 9 2A 2 1B 10 2B T Q 1Q 4 2Q 12 13 1 & RD 2 4 3 6 7 R RCX 5 & 10 12 R SV00098 2003 Mar 13 1RD 2RD SV00099 CX 9 11 3 11 3 Philips Semiconductors Product data Dual retriggerable monostable multivibrator with reset 74LV123 LOGIC DIAGRAM nREXT/CEXT VCC Q RD Q R R CL VCC CL VCC R CL CL CL A B R It is recommended that Pin 6 (2CEXT) and Pin 14 (1CEXT) by externally grounded to Pin 8 (GND) SV00100 FUNCTION TABLE INPUTS nRD VCC OUTPUTS nA nB nQ nQ L X X L H X H X L* H* L* H* X X L H L H H L H REXT CEXT NOTES: * If the monostable was triggered before this condition was established, the pulse will continue as programmed. H = HIGH voltage level L = LOW voltage level X = don't care = LOW-to-HIGH transition = HIGH-to-LOW transition = one HIGH level output pulse = one LOW level output pulse 2003 Mar 13 to nCEXT (pin 14 or 6) to nREXT/CEXT (pin 15 or 7) SV00101 Figure 1. Timing component connection 4 Philips Semiconductors Product data Dual retriggerable monostable multivibrator with reset 74LV123 RECOMMENDED OPERATING CONDITIONS SYMBOL VCC PARAMETER DC supply voltage CONDITIONS MIN TYP MAX UNIT See Note1 1.0 3.3 5.5 V VI Input voltage 0 - VCC V VO Output voltage 0 - VCC V +85 +125 C Tamb tr, tf Operating ambient temperature range in free air See DC and AC characteristics -40 -40 VCC = 1.0 V to 2.0 V - - 500 ns/V VCC = 2.0 V to 2.7 V - - 200 ns/V VCC = 2.7 V to 3.6 V - - 100 ns/V VCC = 3.6 V to 5.5 V - - 50 ns/V Input rise and fall times except for Schmitt-trigger gg inputs NOTE: 1. The LV is guaranteed to function down to VCC = 1.0 V (input levels GND or VCC); DC characteristics are guaranteed from VCC = 1.2 V to VCC = 5.5 V. ABSOLUTE MAXIMUM RATINGS1, 2 In accordance with the Absolute Maximum Rating System (IEC 134). Voltages are referenced to GND (ground = 0 V). SYMBOL PARAMETER CONDITIONS RATING UNIT -0.5 to +7.0 V VCC DC supply voltage IIK DC input diode current VI < -0.5 V or VI > VCC + 0.5 V 20 mA IOK DC output diode current VO < -0.5 V or VO > VCC + 0.5 V 50 mA IO DC output source or sink current (standard outputs) -0.5 V < VO < VCC + 0.5 V 25 mA 50 mA -65 to +150 C IGND, ICC Tstg PTOT DC VCC or GND current for types with standard outputs Storage temperature range Power dissipation per package - plastic DIL - plastic mini-pack (SO) - plastic shrink mini-pack (SSOP and TSSOP) for temperature range: -40 C to +125 C above +70 C derate linearly with 12 mW/K above +70 C derate linearly with 8 mW/K above +60 C derate linearly with 5.5 mW/K 750 500 500 mW NOTES: 1. Stresses beyond those listed 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. 2. The input and output voltage ratings may be exceeded if the input and output current ratings are observed. 2003 Mar 13 5 Philips Semiconductors Product data Dual retriggerable monostable multivibrator with reset 74LV123 DC ELECTRICAL CHARACTERISTICS Over recommended operating conditions. Voltages are referenced to GND (ground = 0 V). LIMITS SYMBOL PARAMETER -40 C to +85 C TEST CONDITIONS MIN VIH VIL HIGH level Input voltage LOW level Input voltage TYP1 VOH O VOL VOL O II ICC ICC HIGH level output voltage; STANDARD outputs LOW level l l output t t voltage out uts voltage; all outputs LOW level output voltage; STANDARD outputs 0.9 VCC = 2.0 V 1.4 1.4 VCC = 2.7 V to 3.6 V 2.0 2.0 VCC = 4.5 V to 5.5 V 0.7*VCC 0.7*VCC UNIT MAX V VCC = 1.2 V 0.3 0.3 VCC = 2.0 V 0.6 0.6 VCC = 2.7 V to 3.6 V 0.8 0.8 0.3*VCC 0.3*VCC V 1.2 VCC = 2.0 V; VI = VIH or VIL; -IO = 100 A 1.8 2.0 1.8 VCC = 2.7 V; VI = VIH or VIL; -IO = 100 A 2.5 2.7 2.5 VCC = 3.0 V; VI = VIH or VIL; -IO = 100 A 2.8 3.0 2.8 VCC = 4.5 V; VI = VIH or VIL; -IO = 100 A 4.3 4.5 4.3 VCC = 3.0 V; VI = VIH or VIL; -IO = 6 mA 2.40 2.82 2.20 VCC = 4.5 V; VI = VIH or VIL; -IO = 12 mA 3.60 4.20 3.50 V V VCC = 1.2 V; VI = VIH or VIL; IO = 100 A 0 VCC = 2.0 V; VI = VIH or VIL; IO = 100 A 0 0.2 0.2 VCC = 2.7 V; VI = VIH or VIL; IO = 100 A 0 0.2 0.2 VCC = 3.0 V; VI = VIH or VIL; IO = 100 A 0 0.2 0.2 VCC = 4.5 V; VI = VIH or VIL; IO = 100 A 0 0.2 0.2 VCC = 3.0 V; VI = VIH or VIL; IO = 6 mA 0.25 0.40 0.50 VCC = 4.5 V; VI = VIH or VIL; IO = 12 mA 0.35 0.55 0.65 V V Input leakage current VCC = 5.5 V; VI = VCC or GND 1.0 1.0 A Quiescent supply current; MSI VCC = 5.5 V; VI = VCC or GND; IO = 0 20.0 160 A Additional quiescent supply current VCC = 2.7 V to 3.6 V; VI = VCC - 0.6 V 500 850 A NOTE: 1. All typical values are measured at Tamb = 25 C. 2003 Mar 13 MIN 0.9 VCC = 1.2 V; VI = VIH or VIL; -IO = 100 A VOH MAX VCC = 1.2 V VCC = 4.5 V to 5.5 V HIGH level l l output t t voltage out uts voltage; all outputs -40 C to +125 C 6 Philips Semiconductors Product data Dual retriggerable monostable multivibrator with reset 74LV123 AC CHARACTERISTICS GND = 0 V; tr = tf 2.5 ns; CL = 50 pF; RL =1 k SYMBOL PARAMETER WAVEFORM CONDITION VCC (V) tPHL tPLH tPHL tPLH tW tW tW Propagation delay nRD, nA, nB, to nQ Propagation delay nRD, nA, nB, to nQ Propagation delay nRD to nQ (reset) Propagation delay nRD to nQ (reset) Trigger gg pulse width nA = LOW Trigger gg pulse width nB = HIGH Reset pulse width nRD = LOW Figure 3 CEXT = 0 pF REXT = 5 k Figure 3 CEXT = 0 pF REXT = 5 k Figure 3 CEXT = 0 pF REXT = 5 k Figure 3 CEXT = 0 pF REXT = 5 k Figure 3 Figure 3 Figure 2 tW tW trtt 2003 Mar 13 Output pulse width nQ = HIGH nQ Q = LOW Retrigger gg time nA, nB Figures 1, 2 CEXT = 100 nF REXT = 10 k Figures 1, 2 CEXT = 0 pF F REXT = 5 k Figure 1 CEXT = 0 pF F REXT = 5 k MIN TYP1 MAX -40 C to +125 C MIN 120 2.0 40 76 92 2.7 30 56 68 3.0 to 3.6 252 48 57 4.5 to 5.5 182 40 46 1.2 120 2.0 40 76 92 2.7 30 56 68 3.0 to 3.6 252 48 57 4.5 to 5.5 182 40 46 1.2 100 2.0 30 57 68 2.7 23 43 51 3.0 to 3.6 202 38 45 4.5 to 5.5 142 31 36 1.2 100 2.0 30 57 68 2.7 23 43 51 3.0 to 3.6 202 38 45 4.5 to 5.5 142 31 2.0 30 ns ns ns ns 36 5 40 2.7 25 3.5 30 3.0 to 3.6 20 3.02 25 4.5 to 5.5 15 2.52 20 2.0 30 13 40 2.7 25 8 30 3.0 to 3.6 20 72 25 4.5 to 5.5 15 52 20 2.0 35 6 45 2.7 30 5 40 3.0 to 3.6 25 42 30 4.5 to 5.5 20 32 25 ns ns ns 470 2.7 460 3.0 to 3.6 4502 4.5 to 5.5 4302 2.0 100 2.7 90 3.0 to 3.6 802 4.5 to 5.5 702 2.0 70 2.7 55 3.0 to 3.6 452 4.5 to 5.5 402 7 UNIT MAX 1.2 2.0 Output pulse width nQ = HIGH nQ Q = LOW LIMITS -40 C to +85 C s ns ns Philips Semiconductors Product data Dual retriggerable monostable multivibrator with reset 74LV123 AC CHARACTERISTICS (Continued) GND = 0 V; tr = tf 2.5 ns; CL = 50 pF; RL = 1 k SYMBOL REXT PARAMETER External timing resistor LIMITS CONDITION WAVEFORM -40 C to +85 C TYP1 VCC (V) MIN 1.2 10 1000 2.0 5 1000 2.7 3 1000 3.0 to 3.6 2 1000 4.5 to 5.5 2 1000 Figure 5 MAX -40 C to +125 C MIN UNIT MAX k 1.2 2.0 CEXT External timing capacitor Figure 53 2.7 No limits pF 3.0 to 3.6 4.5 to 5.5 NOTES: 1. Unless otherwise stated, all typical values are at Tamb = 25 C. 2. Typical value measured at VCC = 3.3 V. 3. Typical value measured at VCC = 5.0 V. 4. For other REXT and CEXT combinations see Figure 5. if CEXT > 10 nF, the next formula is valid: tW = K x REXT x CEXT (typ.) where, tW = output pulse width in ns; REXT = external resistor in k; CEXT = external capacitor in pF; K = constant = 0.45 for VCC = 5.0 V and 0.48 for VCC = 2.0 V. The inherent test jig and pin capacitance at pins 15 and 7 (nREXT/CEXT) is approximately 7 pF. 5. 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 (at VCC = 5.0 V) for the set-up time of a retrigger pulse is valid: trt = 30 + 0.19R x C0.9 + 13 x R1.05 (typ.) If CEXT > 10 pF, the next formula (at VCC = 3.0 V) for the set-up time of a retrigger pulse is valid: = 41 + 0.15R x C0.9 x R1.05 (typ.) trt where, trt = retrigger time in ns; CEXT = external capacitor in pF; REXT = external resistor in k. The inherent test jig and pin capacitance at pins 15 and 7 (nREXT/CEXT) is approximately 7 pF. 6. When the device is powered up, initiate the device via a reset pulse, when CEXT < 50 pF. AC WAVEFORMS VM = 1.5 V at VCC 2.7 V; VM = 0.5 VCC at VCC t 2.7 V; VOL and VOH are the typical output voltage drop that occur with the output load. nB INPUT nB INPUT tW nA INPUT nRD INPUT trt tW tW nQ OUTPUT nQ OUTPUT tW tW tW tW tW SV00139 SV00140 Figure 1. Output pulse control using retrigger pulse; nRD = HIGH. 2003 Mar 13 Figure 2. Output pulse control using reset input nRD; nA = LOW. 8 Philips Semiconductors Product data Dual retriggerable monostable multivibrator with reset nB INPUT (nA LOW) 74LV123 VM tW nA INPUT (nB HIGH) tW VM nRD INPUT tPLH Q OUTPUT tPLH tW VM tTLH tTHL tPHL tW tPLH tW VM Q OUTPUT tTHL tTLH tPLH tPHL SV00197 Figure 3. 2003 Mar 13 Input (nA, nB, nRD) to output (nQ, nQ) propagation delays, the output transition times, and the input and output pulse widths. 9 Philips Semiconductors Product data Dual retriggerable monostable multivibrator with reset 74LV123 APPLICATION INFORMATION 0.8 Power-up considerations When the monostable is powered-up it may produce an output pulse, with a pulse width defined by the values of RX and CX. This output pulse can be eliminated using the circuit shown in Figure 6. `K' factor CX RX VCC 0.4 nCEXT nREXT/CEXT Q A B "123" Q 0 0 2 1 4 3 6 5 VCC (V) SV00185 RESET Figure 4. VCC HCT typical "K" factor as a function of VCC; CX = 10 nF; RX = 10 k to 100 k. SV00152 Figure 6. 106 REXT = 100 kW Power-down considerations A large capacitor (CX) 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 (DX) preferably a germanium or Schottky type diode able to withstand large current surges as shown in Figure 7. 105 50 kW 104 tW ns 10 kW 103 Power-up output pulse elimination circuit 2 kW DX 102 VCC 0 1 10 102 103 104 CX CEXT (pF) RX SV00141 nREXT/CEXT Figure 5. Typical output pulse width as a function of the external capacitor values at VCC = 3.3 V and Tamb = 25 C. 2003 Mar 13 SV00154 Figure 7. 10 Power-down protection circuit Philips Semiconductors Product data Dual retriggerable monostable multivibrator with reset TEST CIRCUIT Vcc VO Vl PULSE GENERATOR D.U.T. 50 pF RT CL RL= 1 k Test Circuit for Outputs DEFINITIONS RL = Load resistor CL = Load capacitance includes jig and probe capacitiance RT = Termination resistance should be equal to ZOUT of pulse generators. TEST tPLH/tPHL VCC < 2.7 V VI VCC 2.7 V to 3.6 V 2.7 V 4.5 V VCC SV00902 Figure 8. 2003 Mar 13 Load circuitry for switching times 11 74LV123 Philips Semiconductors Product data Dual retriggerable monostable multivibrator with reset DIP16: plastic dual in-line package; 16 leads (300 mil); long body 2003 Mar 13 12 74LV123 SOT38-1 Philips Semiconductors Product data Dual retriggerable monostable multivibrator with reset SO16: plastic small outline package; 16 leads; body width 3.9 mm 2003 Mar 13 13 74LV123 SOT109-1 Philips Semiconductors Product data Dual retriggerable monostable multivibrator with reset SSOP16: plastic shrink small outline package; 16 leads; body width 5.3 mm 2003 Mar 13 14 74LV123 SOT338-1 Philips Semiconductors Product data Dual retriggerable monostable multivibrator with reset TSSOP16: plastic thin shrink small outline package; 16 leads; body width 4.4 mm 2003 Mar 13 15 74LV123 SOT403-1 Philips Semiconductors Product data Dual retriggerable monostable multivibrator with reset 74LV123 REVISION HISTORY Rev Date Description _3 20030313 Product data (9397 750 11244). ECN 853-1911 29490 of 07 February 2003. Supersedes Product specification of 1998 Apr 20 (9397 750 04418). Modifications: * Quick Reference Data: Correct power dissipation formula in Note 1. * Ordering information: delete "North America"column; rename column from "Outside North America" to "Order Code". * AC characteristics, Note 5 (on page 8): correct CEXT value calculation formula for 5 V operation; add CEXT value calculation formula for 3.3 V operation. _2 2003 Mar 13 19980420 Product specification (9397 750 04418). ECN 853-1911 19290 of 20 April 1998. Supersedes data of 1997 Feb 04. 16 Philips Semiconductors Product data Dual retriggerable monostable multivibrator with reset 74LV123 Data sheet status Level Data sheet status [1] Product status [2] [3] Definitions I Objective data Development This data sheet contains data from the objective specification for product development. Philips Semiconductors reserves the right to change the specification in any manner without notice. II Preliminary data Qualification This data sheet contains data from the preliminary specification. Supplementary data will be published at a later date. Philips Semiconductors reserves the right to change the specification without notice, in order to improve the design and supply the best possible product. III Product data Production This data sheet contains data from the product specification. Philips Semiconductors reserves the right to make changes at any time in order to improve the design, manufacturing and supply. Relevant changes will be communicated via a Customer Product/Process Change Notification (CPCN). [1] Please consult the most recently issued data sheet before initiating or completing a design. [2] The product status of the device(s) described in this data sheet may have changed since this data sheet was published. The latest information is available on the Internet at URL http://www.semiconductors.philips.com. [3] For data sheets describing multiple type numbers, the highest-level product status determines the data sheet status. Definitions Short-form specification -- The data in a short-form specification is extracted from a full data sheet with the same type number and title. For detailed information see the relevant data sheet or data handbook. Limiting values definition -- Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 60134). 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 -- Applications that are described herein for any of these products are for illustrative purposes only. Philips Semiconductors make no representation or warranty that such applications will be suitable for the specified use without further testing or modification. Disclaimers Life support -- 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 Semiconductors customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from such application. Right to make changes -- Philips Semiconductors reserves the right to make changes in the products--including circuits, standard cells, and/or software--described or contained herein in order to improve design and/or performance. When the product is in full production (status `Production'), relevant changes will be communicated via a Customer Product/Process Change Notification (CPCN). Philips Semiconductors assumes no responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright, or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless otherwise specified. Koninklijke Philips Electronics N.V. 2003 All rights reserved. Printed in U.S.A. Contact information For additional information please visit http://www.semiconductors.philips.com. Fax: +31 40 27 24825 Date of release: 03-03 For sales offices addresses send e-mail to: sales.addresses@www.semiconductors.philips.com. 2003 Mar 13 Document order number: 17 9397 750 11244 Philips Semiconductors - PIP - 74LV123; Dual retriggerable monostable multivibrator with reset Submit Query Philips Semiconductors Home ProductBuy MySemiconductors ContactProduct Information catalogonline Products MultiMarket Semiconductors * Product Selector Catalog by * Function Catalog by * System * Cross-reference * Packages End of Life * information Distributors Go * Here! * Models * SoC solutions * 74LV123; Dual retriggerable monostable multivibrator with reset General description Block diagram Products & packages Features Buy online Parametrics Information as of 2003-04-22 My.Semiconductors.COM. Your personal service from Use right mouse button to download datasheet Philips Semiconductors. Please register now ! Download datasheet Stay informed Applications Support & tools Similar products Datasheet Email/translate General description top The 74LV123 is a low-voltage Si-gate CMOS device and is pin and function compatible with the 74HC/HCT123. The 74LV123 is a dual retriggerable monostable multivibrator with output pulse width control by three methods. The basic pulse time is programmed by selection of an external resistor (REXT ) and capacitor (CEXT ). They are normally connected as shown in Figure 1. 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. Alternatively, an output delay can be terminated at any time by a LOW-going edge on input nRD , which also inhibits the triggering. Figures 1 and 2 illustrate pulse control by retriggering and early reset. The basic output pulse width is essentially determined by the values of the external timing components REXT and CEXT . For pulse width when CEXT > 10000 pF, see Figure 5. When CEXT > 10,000 pF, the typical output pulse width is defined as: tW = 0.45 x REXT x CEXT (typ.), where tW = pulse width in ns; REXT = external resistor in kOhm; and CEXT = external capacitor in pF. Schmitt-trigger action in the nA and nB inputs makes the circuit highly tolerant of slower input rise and fall times. Features top 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 VOLP (output ground bounce) < 0.8 V @ VCC = 3.3 V, Tamb = 25 Cel Typical VOHV (output VOH undershoot) > 2 V @ VCC = 3.3 V, Tamb = 25 Cel DC triggered from active HIGH or active LOW inputs Retriggerable for very long pulses up to 100pct duty factor Direct reset terminates output pulses Schmitt-trigger action on all inputs except for the reset input Output capability: standard (except for nREXT /CEXT ) file:///G|/imaging/BITTING/CPL/20030424/04232003_9/PHGL/_HTML04232003/74LV123D.html (1 of 3) [May-08-2003 6:15:14 PM] Philips Semiconductors - PIP - 74LV123; Dual retriggerable monostable multivibrator with reset ICC category: MSI Datasheet top Type number Title 74LV123 Publication release date Dual retriggerable 3/13/2003 monostable multivibrator with reset Datasheet status Page count File size (kB) Datasheet Product specification 17 153 Download Download PDF File Parametrics top Type number Package Description Propagation Voltage No. Power Logic Output Delay(ns) of Dissipation Switching Drive Pins Considerations Levels Capability Dual Retriggerable Monostable SOT109-1 Multivibrator 15 with Reset; (SO16) Triggerable via Reset Input Low 16 Low Power or Battery Applications TTL Low Dual Retriggerable Monostable SOT338-1 Multivibrator 15 74LV123DB (SSOP16) with Reset; Triggerable via Reset Input Low 16 Low Power or Battery Applications TTL Low Dual Retriggerable Monostable Multivibrator 15 with Reset; Triggerable via Reset Input Low 16 Low Power or Battery Applications TTL Low Dual Retriggerable Monostable SOT403-1 Multivibrator 74LV123PW 15 (TSSOP16) with Reset; Triggerable via Reset Input Low 16 Low Power or Battery Applications TTL Low 74LV123D 74LV123N SOT38-1 (DIP16) file:///G|/imaging/BITTING/CPL/20030424/04232003_9/PHGL/_HTML04232003/74LV123D.html (2 of 3) [May-08-2003 6:15:14 PM] Philips Semiconductors - PIP - 74LV123; Dual retriggerable monostable multivibrator with reset Products, packages, availability and ordering top Type number North Ordering code Marking/Packing Package Device Buy online IC packing info American (12NC) status Download type number PDF File Standard Marking SOT109-1 Full production 74LV123D 74LV123D 9352 102 50112 order this (SO16) * Tube product Standard Marking SOT109-1 74LV123DFull production online 9352 102 50118 * Reel Pack, order this (SO16) T SMD, 13" product Standard Marking SOT338-1 Full production online 74LV123DB 74LV123DB 9352 102 60112 order this (SSOP16) * Tube product Standard Marking SOT338-1 74LV123DBFull production online 9352 102 60118 * Reel Pack, order this (SSOP16) T SMD, 13" product Standard Marking SOT38-1 Full production online 74LV123N 74LV123N 9352 102 70112 order this (DIP16) * Tube product SOT403-1 Standard Marking 74LV123PW 74LV123PW 9352 102 80112 (TSSOP16) Full production online order this * Tube product Standard Marking SOT403-1 online 74LV123PW9352 102 80118 * Reel Pack, (TSSOP16) Full production order this T SMD, 13" product online - - Similar products top 74LV123 links to the similar products page containing an overview of products that are similar in Products function similar or related to the type number(s) as listed on this page. The similar products page includes products from the same catalog tree(s), relevant selection guides and products from the same functional category. to 74LV123 Email/translate this product information top Email this product information. Translate this product information page from English to: French Translate The English language is the official language used at the semiconductors.philips.com website and webpages. All translations on this website are created through the use of Google Language Tools and are provided for convenience purposes only. No rights can be derived from any translation on this website. About this Web Site | Copyright (c) 2003 Koninklijke Philips N.V. All rights reserved. | Privacy Policy | | Koninklijke Philips N.V. | Access to and use of this Web Site is subject to the following Terms of Use. | file:///G|/imaging/BITTING/CPL/20030424/04232003_9/PHGL/_HTML04232003/74LV123D.html (3 of 3) [May-08-2003 6:15:14 PM]