74VHC123AMTC

74VHC123A FAIRCHILD | Alldatasheet

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Technical content

Features

High Speed: t PD 8.1ns (Typ.) at T A 25°C Low Power Dissipation: I CC 4µA (Max) at T A 25°C Active State: I CC 600µA (Max.) at T A 25°C High Noise Immunity: V NIH V NIL 28% V CC (Min.) Power down protection is provided on all inputs Pin and function compatible with 74HC123A 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 main- taining the CMOS low power dissipation. Each multi- vibrator 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 x )(C x ); where PW is in seconds, R is in ohms, and C is in farads. Limits for R x and C x are: External capacitor, C x : No limit External resistors, R x CC 2.0V, 5 k Ω min V CC 3.0V, 1 k Ω 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 mis- matched supply and input voltages.

Ordering Information

Surface mount packages are also available on Tape and Reel. Specify by appending the suffix letter “X” to the ordering number. Order Number Package Number Package Description 74VHC123AM M16A 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150” Narrow 74VHC123ASJ M16D 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 74VHC123AMTC MTC16 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

74VHC123A Dual Retriggerable Monostable Multivibrator ©1993 Fairchild Semiconductor Corporation www.fairchildsemi.com 74VHC123A Rev. 1.2 2 Connection Diagram Pin Description Logic Symbol IEEE/IEC Truth Table H HIGH Voltage Level L LOW Voltage Level HIGH-to-LOW Transition LOW-to-HIGH Transition X Don't Care Pin Names Description AT rigger Inputs (Negative Edge) BT rigger Inputs (Positive Edge) CLR Reset Inputs C x External Capacitor R x External Resistor Q, Q Outputs Inputs Outputs FunctionA B CLR QQ HH Output Enable X LHL H Inhibit HX HL H Inhibit LH Output Enable LH Output Enable XX LL H Reset

74VHC123A Dual Retriggerable Monostable Multivibrator ©1993 Fairchild Semiconductor Corporation www.fairchildsemi.com 74VHC123A Rev. 1.2 3 Block Diagrams Note A: C x , R x , D x are external Capacitor, Resistor, and Diode, respectively. Note B: External clamping diode, D x External capacitor is charged to V CC level in the wait state, i.e. when no trigger is applied. If the supply voltage is turned off, C x discharges mainly through the internal (parasitic) diode. If C x is sufficiently large and V CC 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 V CC 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: t f CC –0.7) C x / 20mA f is the time between the supply voltage turn off and the supply voltage reaching 0.4 V CC In the event a system does not satisfy the above condition, an external clamping diode (D x ) is needed to protect the IC from rush current.

74VHC123A Dual Retriggerable Monostable Multivibrator ©1993 Fairchild Semiconductor Corporation www.fairchildsemi.com 74VHC123A Rev. 1.2 4 System Diagram Timing Chart

74VHC123A Dual Retriggerable Monostable Multivibrator ©1993 Fairchild Semiconductor Corporation www.fairchildsemi.com 74VHC123A Rev. 1.2 5 Functional Description 1. Stand-by State The external capacitor (C x ) is fully charged to V CC in the Stand-by State. That means, before triggering, the Q P and Q N transistors which are connected to the R x x node are in the off state. Two comparators that relate to the timing of the output pulse, and two refer- ence voltage supplies turn off. The total supply cur- rent 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 sig- nal; 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 C and C start operating, and Q N is turned on. The external capacitor discharges through Q N . The volt- age level at the R x x node drops. If the R x x volt- age level falls to the internal reference voltage V ref the output of C becomes LOW. The flip-flop is then reset and Q N turns off. At that moment C stops but C continues operating. After Q N turns off, the voltage at the R x x node starts rising at a rate determined by the time constant of external capacitor C x and resistor R x 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 R x x changes from fall- ing to rising. When R x x reaches the internal refer- ence voltage V ref H, the output of C becomes LOW, the output Q goes LOW and C stops its operation. That means, after triggering, when the voltage level of the R x x node reaches V ref H, the IC returns to its MONOSTABLE state. With large values of C x and R x , and ignoring the dis- charge time of the capacitor and internal delays of the IC, the width of the output pulse, t W (OUT), is as follows: t W (OUT) 1.0 C x R x 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 C x . The voltage level of the R x x node then falls to V ref L level again. Therefore the Q output stays HIGH if the next trigger comes in before the time period set by C x and R x 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, t RR (Min), depends on V CC and C x 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, Q p turns on and C x is charged rapidly to V CC This means if CLR is set LOW, the IC goes into a wait state.

74VHC123A Dual Retriggerable Monostable Multivibrator ©1993 Fairchild Semiconductor Corporation www.fairchildsemi.com 74VHC123A Rev. 1.2 6 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. 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. Notes: 1. Unused inputs must be held HIGH or LOW. They may not float. 2. The maximum allowable values of C x 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 R x > 1MΩ. 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 V CC + 0.5V IIK Input Diode Current –20mA IOK Output Diode Current ±20mA IOUT DC Output Current ±25mA ICC DC VCC / GND Current ±50mA TSTG Storage Temperature –65°C to +150°C TL Lead Temperature (Soldering, 10 seconds) 260°C Symbol Parameter Rating VCC Supply Voltage 2.0V to +5.5V VIN Input Voltage 0V to +5.5V VOUT Output Voltage 0V to VCC TOPR Operating Temperature –40°C to +85°C tr, tf Input Rise and Fall Time (CLR only) V CC = 3.3V ± 0.3V V CC = 5.0V ± 0.5V 0ns/V ∼ 100ns/V 0ns/V ∼ 20ns/V External Capacitor, Cx No Limitation(2) F External Resistor, Rx >5kΩ(2) (VCC = 2.0V) >1kΩ(2) (VCC > 3.0V)

74VHC123A Dual Retriggerable Monostable Multivibrator ©1993 Fairchild Semiconductor Corporation www.fairchildsemi.com 74VHC123A Rev. 1.2 7 Note: 3. Per circuit. Symbol Parameter V CC (V) Conditions TA = 25°C T A = –40° to 85°C VIH HIGH Level Input Voltage 2.0 1.50 1.50 V 3.0–5.5 0.7 x V CC 0.7 x VCC VIL LOW Level Input Voltage 2.0 0.50 0.50 V 3.0–5.5 0.3 x V CC 0.3 x VCC VOH HIGH Level Output Voltage

2.0 V IN = VIH

IOH = –50µA 1.9 2.0 1.9 V 3.0 2.9 3.0 2.9 4.5 4.4 4.5 4.4 3.0 I OH = –4mA 2.58 2.48 4.5 I OH = –8mA 3.94 3.80 VOL LOW Level Output Voltage IOL = 50µA 0.0 0.1 0.1 V 3.0 0.0 0.1 0.1 4.5 0.0 0.1 0.1 3.0 I OL = 4mA 0.36 0.44 4.5 I OL = 8mA 0.36 0.44 IIN Input Leakage Current 0–5.5 V IN = 5.5V or GND ±0.1 ±1.0 µA IIN Rx/Cx Terminal Off-State Current 5.5 V IN = VCC or GND ±0.25 ±2.50 µA ICC Quiescent Supply Current 5.5 V IN = VCC or GND 4.0 40.0 µA ICC Active—State (3) Supply Current

3.0 V IN = VCC or GND,

Rx/Cx = 0.5 VCC 160 250 280 µA 4.5 380 500 650 5.5 560 750 975

74VHC123A Dual Retriggerable Monostable Multivibrator ©1993 Fairchild Semiconductor Corporation www.fairchildsemi.com 74VHC123A Rev. 1.2 8 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+ ICC 1 • Duty / 100 + ICC / 2 (per Circuit) ICC 1: Active Supply Current Duty: % Symbol Parameter V CC (V) Conditions TA = 25°C TA = –40°C to +85°C tPLH, tPHL Propagation Delay Time (A, B–Q, Q) CL = 50 pF 15.9 24.1 1.0 27.5 CL = 50 pF 9.6 14.0 1.0 16.0 tPLH, tPHL Propagation Delay Time (CLR Trigger—Q, Q ) CL = 50 pF 17.0 25.9 1.0 29.5 CL = 50 pF 10.2 14.9 1.0 17.0 tPLH, tPHL Propagation Delay Time (CLR—Q, Q ) CL = 50 pF 12.8 19.3 1.0 22.0 CL = 50 pF 7.8 11.4 1.0 13.0 tWOUT Output Pulse Width 3.3 ± 0.3 C L = 50pF , Cx = 28pF , Rx = 2kΩ 160 240 300 ns 5.0 ± 0.5 133 200 240 3.3 ± 0.3 C L = 50pF , Cx = 0.01µF , Rx = 10kΩ 90 100 110 90 110 µs 5.0 ± 0.5 90 100 110 90 110 3.3 ± 0.3 C L = 50pF , Cx = 0.1µF , Rx = 1kΩ ∆tWOUT Output Pulse Width Error Between Circuits (In same Package) ±1 % C IN Input Capacitance V CC = Open 4 10 10 pF CPD Power Dissipation Capacitance (5) 73 pF

74VHC123A Dual Retriggerable Monostable Multivibrator ©1993 Fairchild Semiconductor Corporation www.fairchildsemi.com 74VHC123A Rev. 1.2 9 AC Operating Requirement(6) Note: 6. Refer to Timing Chart. Symbol Parameter V CC (V) Conditions TA = 25°C TA = –40°C to +85°C tW(L), tW(H) Minimum Trigger Pulse Width 3.3 5.0 5.0 ns 5.0 5.0 5.0 tW(L) Minimum Clear Pulse Width 3.3 5.0 5.0 ns 5.0 5.0 5.0 tRR Minimum Retrigger Time 3.3 ± 0.3 R x = 1kΩ, CX = 100pF 60 ns 5.0 ± 0.5 39

3.3 R x = 1kΩ,

CX = 0.01µF 1.5 µs 5.0 1.2

74VHC123A Dual Retriggerable Monostable Multivibrator ©1993 Fairchild Semiconductor Corporation www.fairchildsemi.com 74VHC123A Rev. 1.2 10 Device Characteristics twout*Cx Characteristics (Typ.) Output Pulse Width Constant K-Supply Voltage (Typ.) tRR*VCC Characteristics (Typ.) Input Equivalent Circuit

Dimensions are in millimeters unless otherwise noted. Figure 1. 16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150" Narrow

Dimensions are in millimeters unless otherwise noted. Figure 2. 16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide

Dimensions are in millimeters unless otherwise noted. Figure 3. 16-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

74VHC123A Dual Retriggerable Monostable Multivibrator ©1993 Fairchild Semiconductor Corporation www.fairchildsemi.com 74VHC123A Rev. 1.2 14 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.™ ActiveArray™ Bottomless™ Build it Now™ CoolFET™ CROSSVOLT™ CTL™ Current Transfer Logic™ DOME™ 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 Definition Advance Information Formative or In Design This datasheet contains the design specifications for product development. Specifications may change in any manner without notice. Preliminary 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 First 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