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| 74VHC123A Dual Retriggerable Monostable Multivibrator May 2007 74VHC123A Dual Retriggerable Monostable Multivibrator Features High Speed: tPD = 8.1ns (Typ.) at TA = 25C Low Power Dissipation: ICC = 4A (Max) at TA = 25C Active State: ICC = 600A (Max.) at TA = 25C High Noise Immunity: VNIH = VNIL = 28% VCC (Min.) Power down protection is provided on all inputs Pin and function compatible with 74HC123A tm General Description 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. Limits for Rx and Cx are: External capacitor, Cx : No limit External resistors, Rx: VCC = 2.0V, 5 k min VCC > 3.0V, 1 k 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 M16A M16D MTC16 Package Description 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 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. (c)1993 Fairchild Semiconductor Corporation 74VHC123A Rev. 1.2 www.fairchildsemi.com 74VHC123A Dual Retriggerable Monostable Multivibrator Connection Diagram Logic Symbol IEEE/IEC Pin Description Pin Names A B CLR Cx Rx Q, Q Description Trigger Inputs (Negative Edge) Trigger Inputs (Positive Edge) Reset Inputs External Capacitor External Resistor Outputs Truth Table Inputs A X H L L X H X L L H Outputs CLR H H H H L L H H B H L X Q Q Function Output Enable Inhibit Inhibit Output Enable Output Enable Reset H = HIGH Voltage Level L = LOW Voltage Level = HIGH-to-LOW Transition = LOW-to-HIGH Transition X = Don't Care (c)1993 Fairchild Semiconductor Corporation 74VHC123A Rev. 1.2 www.fairchildsemi.com 2 74VHC123A Dual Retriggerable Monostable Multivibrator Block Diagrams 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. (c)1993 Fairchild Semiconductor Corporation 74VHC123A Rev. 1.2 www.fairchildsemi.com 3 74VHC123A Dual Retriggerable Monostable Multivibrator System Diagram Timing Chart (c)1993 Fairchild Semiconductor Corporation 74VHC123A Rev. 1.2 www.fairchildsemi.com 4 74VHC123A Dual Retriggerable Monostable Multivibrator Functional Description 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. 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. 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. 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. 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, 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. 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 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. 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 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. This means if CLR is set LOW, the IC goes into a wait state. (c)1993 Fairchild Semiconductor Corporation 74VHC123A Rev. 1.2 www.fairchildsemi.com 5 74VHC123A Dual Retriggerable Monostable Multivibrator Absolute Maximum Ratings 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 VCC VIN VOUT IIK IOK IOUT ICC TSTG TL Supply Voltage DC Input Voltage DC Output Voltage Input Diode Current Output Diode Current DC Output Current DC VCC / GND Current Storage Temperature Parameter Rating -0.5V to +7.0V -0.5V to +7.0V -0.5V to VCC + 0.5V -20mA 20mA 25mA 50mA -65C to +150C 260C Lead Temperature (Soldering, 10 seconds) 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 VCC VIN VOUT TOPR tr , tf Supply Voltage Input Voltage Output Voltage Operating Temperature Parameter Rating 2.0V to +5.5V 0V to +5.5V 0V to VCC -40C to +85C 0ns/V 100ns/V 0ns/V 20ns/V No Limitation(2) F >5k(2) (VCC = 2.0V) >1k(2) (VCC > 3.0V) Input Rise and Fall Time (CLR only) VCC = 3.3V 0.3V VCC = 5.0V 0.5V External Capacitor, Cx External Resistor, Rx 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 > 1M. (c)1993 Fairchild Semiconductor Corporation 74VHC123A Rev. 1.2 www.fairchildsemi.com 6 74VHC123A Dual Retriggerable Monostable Multivibrator DC Electrical Characteristics TA = 25C Symbol VIH VIL VOH TA = -40 to 85C Max. Min. 1.50 0.7 x VCC 0.50 0.50 0.3 x VCC 1.9 2.9 4.4 2.48 3.80 V V Parameter HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Voltage VCC (V) 2.0 3.0-5.5 2.0 3.0-5.5 2.0 3.0 4.5 3.0 4.5 Conditions Min. 1.50 0.7 x VCC Typ. Max. Units V 0.3 x VCC VIN = VIH or VIL IOH = -50A 1.9 2.9 4.4 IOH = -4mA IOH = -8mA VIN = VIH or VIL IOL = 50A 2.58 3.94 0.0 0.0 0.0 IOL = 4mA IOL = 8mA VIN = 5.5V or GND VIN = VCC or GND VIN = VCC or GND VIN = VCC or GND, Rx/Cx = 0.5 VCC 160 380 560 0.1 0.1 0.1 0.36 0.36 0.1 0.25 2.0 3.0 4.5 VOL LOW Level Output Voltage 2.0 3.0 4.5 3.0 4.5 0.1 0.1 0.1 0.44 0.44 1.0 2.50 V IIN IIN ICC ICC Input Leakage Current Rx/Cx Terminal Off-State Current Quiescent Supply Current Active--State(3) Supply Current 0-5.5 5.5 A A 5.5 3.0 4.5 5.5 4.0 250 500 750 40.0 280 650 975 A A Note: 3. Per circuit. (c)1993 Fairchild Semiconductor Corporation 74VHC123A Rev. 1.2 www.fairchildsemi.com 7 74VHC123A Dual Retriggerable Monostable Multivibrator AC Electrical Characteristics(4) TA = 25C Symbol Parameter 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 Output Pulse Width Error Between Circuits (In same Package) Input Capacitance Power Dissipation Capacitance VCC = Open (5) TA = -40C to +85C Min. 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 Conditions CL = 15 pF CL = 50 pF CL = 15 pF CL = 50 pF CL = 15 pF CL = 50 pF CL = 15 pF CL = 50 pF CL = 15 pF CL = 50 pF CL = 15 pF CL = 50 pF CL = 50pF, Cx = 28pF, Rx = 2k CL = 50pF, Cx = 0.01F, Rx = 10k CL = 50pF, Cx = 0.1F, Rx = 1k Min. Typ. 13.4 15.9 8.1 9.6 14.5 17.0 8.7 10.2 10.3 12.8 6.3 7.8 160 133 Max. 20.6 24.1 12.0 14.0 22.4 25.9 12.9 14.9 15.8 19.3 9.4 11.4 240 200 110 110 1.1 1.1 Max. Units 24.0 27.5 14.0 16.0 26.0 29.5 15.0 17.0 18.5 22.0 11.0 13.0 300 240 ns s ms % ns ns ns ns ns ns tPLH, tPHL Propagation Delay Time (A, B-Q, Q) 90 90 0.9 0.9 100 100 1.0 1.0 1 90 90 0.9 0.9 110 110 1.1 1.1 CIN CPD 4 73 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: % (c)1993 Fairchild Semiconductor Corporation 74VHC123A Rev. 1.2 www.fairchildsemi.com 8 74VHC123A Dual Retriggerable Monostable Multivibrator AC Operating Requirement(6) TA = 25C Symbol tW(L), tW(H) tW(L) tRR TA = -40C to +85C Min. 5.0 5.0 5.0 5.0 ns ns s Parameter Minimum Trigger Pulse Width Minimum Clear Pulse Width Minimum Retrigger Time VCC (V) 3.3 5.0 3.3 5.0 3.3 0.3 5.0 0.5 3.3 5.0 Conditions Min. 5.0 5.0 5.0 5.0 Typ. Max. Max. Units ns Rx = 1k, CX = 100pF Rx = 1k, CX = 0.01F 60 39 1.5 1.2 Note: 6. Refer to Timing Chart. (c)1993 Fairchild Semiconductor Corporation 74VHC123A Rev. 1.2 www.fairchildsemi.com 9 74VHC123A Dual Retriggerable Monostable Multivibrator Device Characteristics twout*Cx Characteristics (Typ.) tRR*VCC Characteristics (Typ.) Output Pulse Width Constant K-Supply Voltage (Typ.) Input Equivalent Circuit (c)1993 Fairchild Semiconductor Corporation 74VHC123A Rev. 1.2 www.fairchildsemi.com 10 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 (c)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 (c)1993 Fairchild Semiconductor Corporation 74VHC123A Rev. 1.2 www.fairchildsemi.com 12 74VHC123A Dual Retriggerable Monostable Multivibrator Physical Dimensions (Continued) Dimensions are in millimeters unless otherwise noted. 5.000.10 4.55 5.90 4.45 7.35 0.65 4.40.1 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 (c)1993 Fairchild Semiconductor Corporation 74VHC123A Rev. 1.2 www.fairchildsemi.com 13 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. ACEx Across the board. Around the world.TM ActiveArrayTM BottomlessTM Build it NowTM CoolFETTM CROSSVOLTTM CTLTM Current Transfer LogicTM DOMETM 2 E CMOSTM (R) EcoSPARK EnSignaTM FACT Quiet SeriesTM (R) FACT (R) FAST FASTrTM FPSTM (R) FRFET GlobalOptoisolatorTM GTOTM HiSeCTM (R) i-LoTM ImpliedDisconnectTM IntelliMAXTM ISOPLANARTM MICROCOUPLERTM MicroPakTM MICROWIRETM Motion-SPMTM MSXTM MSXProTM OCXTM OCXProTM (R) OPTOLOGIC (R) OPTOPLANAR PACMANTM PDP-SPMTM POPTM (R) Power220 (R) Power247 PowerEdgeTM PowerSaverTM Power-SPMTM (R) PowerTrench Programmable Active DroopTM (R) QFET QSTM QT OptoelectronicsTM Quiet SeriesTM RapidConfigureTM RapidConnectTM ScalarPumpTM SMART STARTTM (R) SPM STEALTHTM SuperFETTM SuperSOTTM -3 SuperSOTTM -6 SuperSOTTM -8 SyncFETTM TCMTM (R) The Power Franchise TM TinyBoostTM TinyBuckTM (R) TinyLogic TINYOPTOTM TinyPowerTM TinyWireTM TruTranslationTM SerDesTM (R) UHC UniFETTM VCXTM WireTM 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. PRODUCT STATUS DEFINITIONS Definition of Terms Datasheet Identification Advance Information Preliminary Product Status Formative or In Design First Production Definition This datasheet contains the design specifications for product development. Specifications may change in any manner without notice. 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. This datasheet contains final specifications. Fairchild Semiconductor reserves the right to make changes at any time without notice to improve design. This datasheet contains specifications on a product that has been discontinued by Fairchild Semiconductor. The datasheet is printed for reference information only. Rev. I26 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. No Identification Needed Full Production Obsolete Not In Production (c)1993 Fairchild Semiconductor Corporation 74VHC123A Rev. 1.2 www.fairchildsemi.com 14 |
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