74VHC123A Dual Retriggerable Monostable Multivibrator tm Features General Description ■ High Speed: tPD = 8.1ns (Typ.) at TA = 25°C ■ Low Power Dissipation: ICC = 4µA (Max) at TA = 25°C The VHC123A is an advanced high speed CMOS Monostable Multivibrator fabricated with silicon gate CMOS technology. It achieves the high speed operation similar to equivalent Bipolar Schottky TTL while maintaining the CMOS low power dissipation. Each multivibrator features both a negative, A, and a positive, B, transition triggered input, either of which can be used as an inhibit input. Also included is a clear input that when taken low resets the one-shot. The VHC123A can be triggered on the positive transition of the clear while A is held low and B is held high. The output pulse width is determined by the equation: PW = (Rx)(Cx); where PW is in seconds, R is in ohms, and C is in farads. ■ Active State: ICC = 600µA (Max.) at TA = 25°C ■ High Noise Immunity: VNIH = VNIL = 28% VCC (Min.) ■ Power down protection is provided on all inputs ■ Pin and function compatible with 74HC123A Limits for Rx and Cx are: External capacitor, Cx : No limit External resistors, Rx: VCC = 2.0V, 5 kΩ min VCC > 3.0V, 1 kΩ min An input protection circuit ensures that 0 to 7V can be applied to the input pins without regard to the supply voltage. This device can be used to interface 5V to 3V systems and two supply systems such as battery back up. This circuit prevents device destruction due to mismatched supply and input voltages. Ordering Information Order Number 74VHC123AM 74VHC123ASJ 74VHC123AMTC Package Number Package Description M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150” Narrow M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide MTC16 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide Surface mount packages are also available on Tape and Reel. Specify by appending the suffix letter “X” to the ordering number. ©1993 Fairchild Semiconductor Corporation 74VHC123A Rev. 1.2 www.fairchildsemi.com 74VHC123A Dual Retriggerable Monostable Multivibrator May 2007 Logic Symbol IEEE/IEC Pin Description Pin Names Description A Trigger Inputs (Negative Edge) B Trigger Inputs (Positive Edge) CLR Reset Inputs Cx External Capacitor Rx External Resistor Q, Q Outputs Truth Table Inputs A Outputs B CLR H H X L H L H H X H L H L Q Q Output Enable H L H X X Function Inhibit Inhibit Output Enable Output Enable L L H Reset H = HIGH Voltage Level L = LOW Voltage Level = HIGH-to-LOW Transition = LOW-to-HIGH Transition X = Don't Care ©1993 Fairchild Semiconductor Corporation 74VHC123A Rev. 1.2 www.fairchildsemi.com 2 74VHC123A Dual Retriggerable Monostable Multivibrator Connection Diagram Note A: Cx, Rx, Dx are external Capacitor, Resistor, and Diode, respectively. Note B: External clamping diode, Dx; External capacitor is charged to VCC level in the wait state, i.e. when no trigger is applied. If the supply voltage is turned off, Cx discharges mainly through the internal (parasitic) diode. If Cx is sufficiently large and VCC drops rapidly, there will be some possibility of damaging the IC through in rush current or latch-up. If the capacitance of the supply voltage filter is large enough and VCC drops slowly, the in rush current is automatically limited and damage to the IC is avoided. The maximum value of forward current through the parasitic diode is ±20mA. In the case of a large Cx, the limit of fall time of the supply voltage is determined as follows: tf ≥ (VCC –0.7) Cx / 20mA (tf is the time between the supply voltage turn off and the supply voltage reaching 0.4 VCC) In the event a system does not satisfy the above condition, an external clamping diode (Dx) is needed to protect the IC from rush current. ©1993 Fairchild Semiconductor Corporation 74VHC123A Rev. 1.2 www.fairchildsemi.com 3 74VHC123A Dual Retriggerable Monostable Multivibrator Block Diagrams 74VHC123A Dual Retriggerable Monostable Multivibrator System Diagram Timing Chart ©1993 Fairchild Semiconductor Corporation 74VHC123A Rev. 1.2 www.fairchildsemi.com 4 the output Q goes LOW and C2 stops its operation. That means, after triggering, when the voltage level of the Rx/Cx node reaches VrefH, the IC returns to its MONOSTABLE state. 1. Stand-by State The external capacitor (Cx) is fully charged to VCC in the Stand-by State. That means, before triggering, the QP and QN transistors which are connected to the Rx/Cx node are in the off state. Two comparators that relate to the timing of the output pulse, and two reference voltage supplies turn off. The total supply current is only leakage current. With large values of Cx and Rx, and ignoring the discharge time of the capacitor and internal delays of the IC, the width of the output pulse, tW (OUT), is as follows: tW (OUT) = 1.0 Cx Rx 2. Trigger Operation Trigger operation is effective in any of the following three cases. First, the condition where the A input is LOW, and B input has a rising signal; second, where the B input is HIGH, and the A input has a falling signal; and third, where the A input is LOW and the B input is HIGH, and the CLR input has a rising signal. 3. Retrigger operation (74VHC123A) When a new trigger is applied to either input A or B while in the MONOSTABLE state, it is effective only if the IC is charging Cx. The voltage level of the Rx/Cx node then falls to VrefL level again. Therefore the Q output stays HIGH if the next trigger comes in before the time period set by Cx and Rx. After a trigger becomes effective, comparators C1 and C2 start operating, and QN is turned on. The external capacitor discharges through QN. The voltage level at the Rx/Cx node drops. If the Rx/Cx voltage level falls to the internal reference voltage VrefL, the output of C1 becomes LOW. The flip-flop is then reset and QN turns off. At that moment C1 stops but C2 continues operating. If the new trigger is very close to a previous trigger, such as an occurrence during the discharge cycle, it will have no effect. The minimum time for a trigger to be effective 2nd trigger, tRR (Min), depends on VCC and Cx. 4. Reset Operation After QN turns off, the voltage at the Rx /Cx node starts rising at a rate determined by the time constant of external capacitor Cx and resistor Rx. In normal operation, the CLR input is held HIGH. If CLR is LOW, a trigger has no affect because the Q output is held LOW and the trigger control F/F is reset. Also, Qp turns on and Cx is charged rapidly to VCC. Upon triggering, output Q becomes HIGH, following some delay time of the internal F/F and gates. It stays HIGH even if the voltage of Rx/Cx changes from falling to rising. When Rx/Cx reaches the internal reference voltage VrefH, the output of C2 becomes LOW, ©1993 Fairchild Semiconductor Corporation 74VHC123A Rev. 1.2 This means if CLR is set LOW, the IC goes into a wait state. www.fairchildsemi.com 5 74VHC123A Dual Retriggerable Monostable Multivibrator Functional Description Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. Symbol Parameter Rating VCC Supply Voltage –0.5V to +7.0V VIN DC Input Voltage –0.5V to +7.0V VOUT DC Output Voltage –0.5V to VCC + 0.5V IIK Input Diode Current –20mA IOK Output Diode Current ±20mA IOUT DC Output Current ±25mA ICC DC VCC / GND Current ±50mA TSTG TL Storage Temperature –65°C to +150°C Lead Temperature (Soldering, 10 seconds) 260°C Recommended Operating Conditions(1) The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not recommend exceeding them or designing to absolute maximum ratings. Symbol Parameter VCC Supply Voltage VIN Input Voltage VOUT Output Voltage TOPR Operating Temperature tr , tf Rating 2.0V to +5.5V 0V to +5.5V 0V to VCC –40°C to +85°C Input Rise and Fall Time (CLR only) VCC = 3.3V ± 0.3V 0ns/V ∼ 100ns/V VCC = 5.0V ± 0.5V 0ns/V ∼ 20ns/V No Limitation(2) F External Capacitor, Cx >5kΩ(2) (VCC = 2.0V) External Resistor, Rx >1kΩ(2) (VCC > 3.0V) Notes: 1. Unused inputs must be held HIGH or LOW. They may not float. 2. The maximum allowable values of Cx and Rx are a function of the leakage of capacitor Cx, the leakage of the device, and leakage due to board layout and surface resistance. Susceptibility to externally induced noise signals may occur for Rx > 1MΩ. ©1993 Fairchild Semiconductor Corporation 74VHC123A Rev. 1.2 www.fairchildsemi.com 6 74VHC123A Dual Retriggerable Monostable Multivibrator Absolute Maximum Ratings TA = 25°C Symbol Parameter VIH HIGH Level Input Voltage VIL LOW Level Input Voltage VOH HIGH Level Output Voltage VCC (V) Conditions Min. 2.0 1.50 3.0–5.5 0.7 x VCC 3.0 LOW Level Output Voltage Min. IOH = –50µA 2.0 1.9 2.9 3.0 2.9 4.4 4.5 4.4 IOH = –4mA 2.58 2.48 4.5 IOH = –8mA 3.94 3.80 3.0 VIN = VIH or VIL IOL = 50µA 4.5 3.0 4.5 V 0.0 0.1 0.1 0.0 0.1 0.1 0.0 IOL = 4mA IOL = 8mA V 0.3 x VCC 1.9 3.0 2.0 Units V 0.50 0.3 x VCC VIN = VIH or VIL Max. 0.7 x VCC 0.50 3.0–5.5 2.0 Max. 1.50 2.0 4.5 VOL Typ. TA = –40° to 85°C 0.1 0.1 0.36 0.44 V 0.36 0.44 0–5.5 VIN = 5.5V or GND ±0.1 ±1.0 µA Rx/Cx Terminal Off-State Current 5.5 VIN = VCC or GND ±0.25 ±2.50 µA ICC Quiescent Supply Current 5.5 VIN = VCC or GND 4.0 40.0 µA ICC Active—State(3) Supply Current 3.0 VIN = VCC or GND, Rx/Cx = 0.5 VCC 160 250 280 µA 380 500 650 560 750 975 IIN Input Leakage Current IIN 4.5 5.5 Note: 3. Per circuit. ©1993 Fairchild Semiconductor Corporation 74VHC123A Rev. 1.2 www.fairchildsemi.com 7 74VHC123A Dual Retriggerable Monostable Multivibrator DC Electrical Characteristics TA = –40°C to +85°C TA = 25°C Symbol Parameter tPLH, tPHL Propagation Delay Time (A, B–Q, Q) VCC (V) 3.3 ± 0.3 5.0 ± 0.5 tPLH, tPHL Propagation Delay Time (CLR Trigger—Q, Q) 3.3 ± 0.3 5.0 ± 0.5 tPLH, tPHL Propagation Delay Time (CLR—Q, Q) 3.3 ± 0.3 5.0 ± 0.5 tWOUT Output Pulse Width 3.3 ± 0.3 5.0 ± 0.5 3.3 ± 0.3 5.0 ± 0.5 3.3 ± 0.3 5.0 ± 0.5 ∆tWOUT Conditions Min. Typ. Max. Min. Max. Units CL = 15 pF 13.4 20.6 1.0 24.0 CL = 50 pF 15.9 24.1 1.0 27.5 CL = 15 pF 8.1 12.0 1.0 14.0 CL = 50 pF 9.6 14.0 1.0 16.0 CL = 15 pF 14.5 22.4 1.0 26.0 CL = 50 pF 17.0 25.9 1.0 29.5 CL = 15 pF 8.7 12.9 1.0 15.0 CL = 50 pF 10.2 14.9 1.0 17.0 CL = 15 pF 10.3 15.8 1.0 18.5 CL = 50 pF 12.8 19.3 1.0 22.0 CL = 15 pF 6.3 9.4 1.0 11.0 CL = 50 pF 7.8 11.4 1.0 13.0 CL = 50pF, Cx = 28pF, Rx = 2kΩ 160 240 300 133 200 CL = 50pF, Cx = 0.01µF, Rx = 10kΩ 90 100 110 90 110 90 100 110 90 110 CL = 50pF, Cx = 0.1µF, Rx = 1kΩ 0.9 1.0 1.1 0.9 1.1 0.9 1.0 1.1 0.9 1.1 Output Pulse Width Error Between Circuits (In same Package) CIN Input Capacitance VCC = Open Power Dissipation Capacitance (5) 4 73 ns ns ns ns ns ns 240 ±1 CPD ns µs ms % 10 10 pF pF Notes: 4. Refer to Timing Chart. 5. CPD is defined as the value of the internal equivalent capacitance which is calculated from the operating current consumption without load. Average operating current can be obtained by the equation: ICC (opr.) = CPD • VCC • fIN+ ICC1 • Duty / 100 + ICC / 2 (per Circuit) ICC1: Active Supply Current Duty: % ©1993 Fairchild Semiconductor Corporation 74VHC123A Rev. 1.2 www.fairchildsemi.com 8 74VHC123A Dual Retriggerable Monostable Multivibrator AC Electrical Characteristics(4) TA = 25°C Symbol tW(L), tW(H) tW(L) tRR Parameter VCC (V) Conditions Min. Typ. Max. TA = –40°C to +85°C Min. Minimum Trigger 3.3 5.0 5.0 Pulse Width 5.0 5.0 5.0 Minimum Clear Pulse Width 3.3 5.0 5.0 5.0 5.0 5.0 Minimum Retrigger Time 3.3 ± 0.3 5.0 ± 0.5 3.3 5.0 Rx = 1kΩ, CX = 100pF 60 Rx = 1kΩ, CX = 0.01µF 1.5 Max. Units ns ns ns 39 µs 1.2 Note: 6. Refer to Timing Chart. ©1993 Fairchild Semiconductor Corporation 74VHC123A Rev. 1.2 www.fairchildsemi.com 9 74VHC123A Dual Retriggerable Monostable Multivibrator AC Operating Requirement(6) twout*Cx Characteristics (Typ.) tRR*VCC Characteristics (Typ.) Output Pulse Width Constant K-Supply Voltage (Typ.) Input Equivalent Circuit ©1993 Fairchild Semiconductor Corporation 74VHC123A Rev. 1.2 www.fairchildsemi.com 10 74VHC123A Dual Retriggerable Monostable Multivibrator Device Characteristics 74VHC123A Dual Retriggerable Monostable Multivibrator Physical Dimensions Dimensions are in millimeters unless otherwise noted. Figure 1. 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow Package Number M16A ©1993 Fairchild Semiconductor Corporation 74VHC123A Rev. 1.2 www.fairchildsemi.com 11 74VHC123A Dual Retriggerable Monostable Multivibrator Physical Dimensions (Continued) Dimensions are in millimeters unless otherwise noted. Figure 2. 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide Package Number M16D ©1993 Fairchild Semiconductor Corporation 74VHC123A Rev. 1.2 www.fairchildsemi.com 12 5.00±0.10 4.55 5.90 4.45 7.35 0.65 4.4±0.1 1.45 5.00 0.11 12° MTC16rev4 Figure 3. 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide Package Number MTC16 ©1993 Fairchild Semiconductor Corporation 74VHC123A Rev. 1.2 www.fairchildsemi.com 13 74VHC123A Dual Retriggerable Monostable Multivibrator Physical Dimensions (Continued) Dimensions are in millimeters unless otherwise noted. ® ACEx Across the board. Around the world.™ ActiveArray™ Bottomless™ Build it Now™ CoolFET™ CROSSVOLT™ CTL™ Current Transfer Logic™ DOME™ 2 E CMOS™ ® EcoSPARK EnSigna™ FACT Quiet Series™ ® FACT ® FAST FASTr™ FPS™ ® FRFET GlobalOptoisolator™ GTO™ HiSeC™ i-Lo™ ImpliedDisconnect™ IntelliMAX™ ISOPLANAR™ MICROCOUPLER™ MicroPak™ MICROWIRE™ Motion-SPM™ MSX™ MSXPro™ OCX™ OCXPro™ ® OPTOLOGIC ® OPTOPLANAR PACMAN™ PDP-SPM™ POP™ ® Power220 ® Power247 PowerEdge™ PowerSaver™ Power-SPM™ ® PowerTrench Programmable Active Droop™ ® QFET QS™ QT Optoelectronics™ Quiet Series™ RapidConfigure™ RapidConnect™ ScalarPump™ SMART START™ ® SPM STEALTH™ SuperFET™ SuperSOT™-3 SuperSOT™-6 SuperSOT™-8 SyncFET™ TCM™ ® The Power Franchise TinyBoost™ TinyBuck™ ® TinyLogic TINYOPTO™ TinyPower™ TinyWire™ TruTranslation™ µSerDes™ ® UHC UniFET™ VCX™ Wire™ ™ DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. THESE SPECIFICATIONS DO NOT EXPAND THE TERMS OF FAIRCHILD’S WORLDWIDE TERMS AND CONDITIONS, SPECIFICALLY THE WARRANTY THEREIN, WHICH COVERS THESE PRODUCTS. LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. A critical component in any component of a life support, device, or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. PRODUCT STATUS DEFINITIONS Definition of Terms Datasheet Identification Product Status Advance Information Formative or In Design This datasheet contains the design specifications for product development. Specifications may change in any manner without notice. Definition Preliminary First Production This datasheet contains preliminary data; supplementary data will be published at a later date. Fairchild Semiconductor reserves the right to make changes at any time without notice to improve design. No Identification Needed Full Production This datasheet contains final specifications. Fairchild Semiconductor reserves the right to make changes at any time without notice to improve design. Obsolete Not In Production This datasheet contains specifications on a product that has been discontinued by Fairchild Semiconductor. The datasheet is printed for reference information only. Rev. I26 ©1993 Fairchild Semiconductor Corporation 74VHC123A Rev. 1.2 www.fairchildsemi.com 14 74VHC123A Dual Retriggerable Monostable Multivibrator TRADEMARKS The following are registered and unregistered trademarks Fairchild Semiconductor owns or is authorized to use and is not intended to be an exhaustive list of all such trademarks.