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HC123
Dual Retriggerable Monostable Multivibrator
4HC123 /123AM74HC123/123ADUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR
B1R(Plastic Package)
ORDER CODES:M54HCXXXF1R M74HCXXXM1R
M74HCXXXB1R M74HCXXXC1R
F1R(CeramicPackage)
M1R(MicroPackage)
C1R(Chip Carrier)
PIN CONNECTIONS (top view)= Internal HIGH SPEED
tPD=25ns (TYP)at VCC =5V. LOWPOWER DISSIPATION
STANDBYSTATE ICC=4μA (MAX.) AT TA=25°C
ACTIVESTATE ICC =200μA (TYP.)AT VCC=5V. HIGH NOISE IMMUNITY
VNIH =VNIL =28% VCC (MIN.). OUTPUT DRIVE CAPABILITY LSTTL LOADS. SYMMETRICAL OUTPUT IMPEDANCE
IOH =IOL=4 mA (MIN.). BALANCEDPROPAGATION DELAYS
tPLH =tPHL. WIDE OPERATING VOLTAGE RANGE
VCC (OPR)=2V TO6V. WIDE OUTPUT PULSE WIDTH RANGE
tWOUT= 120ns∼60s OVER AT VCC= 4.5V. PIN AND FUNCTION COMPATIBLE WITH
54/74LS123
The M54/74HC123isa high speed CMOS MONO-
STABLE multivibrator fabricated with silicon gate2 MOS technology.It achieves the high speed
operation similarto equivalent LSTTL while main-
taining the CMOS low power dissipation. There are
two trigger inputs,A INPUT (negative edge) and8
INPUT (positive edge). These inputs are valid for
slow rising/falling signals,(tr=tf=I sec). The device
may alsobe triggeredby using the CLR input (posi-
tive-edge) becauseof the Schmitt-trigger input;
after triggering the output maintains the MONO-
STABLEstatefor the time period determinedby the
external resistor Rx and capacitor Cx. When Cx≥
10nF and Rx≥ 10KΩ, the output pulse width value approssimatively givenby the formula: tw(out) =K Cx• Rx.
Two different pulse width constant are available:≅ 0.45 for HC123 K≅1for HC123A.
Taking CLR low breaks this MONOSTABLE
STATE.If the next trigger pulse occurs during the
MONOSTABLEperiodit makes the MONOSTABLE
period longer. Limitfor valuesofCx andRx:: NO LIMIT: VCC< 3.0V5KΩto1 M Ω
VCC≥ 3.0V1 K Ωto1 M Ω
DESCRIPTION
SYSTEM DIAGRAM
TIMING CHART
M54/M74HC123/123A
BLOCK DIAGRAM
Note:(1)Cx,Rx, Dxare external components.
(2)Dxisa clampingdiode.
Theexternalcapacitor ischarged toVCC inthestand-by state, i.e.no trigger.Whenthesupply voltageisturnedoff Cxisdischarged mainly
throughaninternal parasitic diode (seefigures). IfCxis sufficiently largeandVCC decreases rapidy, therewill besomepossibility ofda-
maging theI.C.witha surge currentor latch-up. Ifthe voltage supply filtercapacitoris largeenoughandVCC decrease slowly,the surge
currentis automatically limitedand damagetheI.C. isavoided. The maximum forwardcurrentofthe parasiticdiodeis approximately20
mA.In cases whereCx islargethe timetakenforthe supply voltagetofallto 0.4VCC canbe calculatedas follows:
tf≥ (VCC –0.7) ⋅Cx/20mA
Incases wheretf istoo shortan external clamping diodeis required toprotecttheI.C. from thesurge current.
FUNCTIONAL DESCRIPTIONSTAND-BY STATE
The external capacitor, Cx,is fully chargedto VCC the stand-by state.Hence, before triggering, tran-
sistor Qp and Qn (connectedto the Rx/Cx node) are
both turned-off. The two comparators that control
the timing and the two reference voltage sources
stop operating. The total supply currentis therefore
only leakage current.
TRIGGER OPERATION
Triggering occurs when:st)Ais ”low” andB hasa falling edge; nd)Bis ”high” andA hasa rising edge;rd)Ais lowandBis high andC1 hasa rising edge.
After the multivibrator has been retriggered com-
parator C1 and C2 start operating and Qn isturned
on. Cx then discharges through Qn. The voltageat
the node R/C external falls.
Whenit reaches VREFL the outputof comparator C1
becomes low.Thisin turn resets the flip-flop and Qn turned off. this point C1 stops functioning but C2 continues operate.
The voltageatR/C external beginsto rise witha time
constant setby the external components Rx, Cx.
Triggering the multivibrator causes Qto gohigh after
internal delay dueto the flip-flop and the gate.Qre-
mains high until the voltageat R/C external rises
againto VREFH. Atthis point C2 output goes low and goes low. C2 stop operating. That means that
after triggering when the voltage R/C external re-
turnsto VREFH the multivibrator has returnedtoits
MONOSTABLE STATE.In the case whereRx⋅ Cx
are large enough and the discharge timeof the ca-
pacitor and the delay timein the I.C. canbe ignored,
the widthof the output pulsetw (out)isas follows:
tW(OUT)= 0.46 Cx⋅ Rx (HC123)
tW(OUT) =Cx⋅ Rx (HC123A)
M54/M74HC123/123A
FUNCTIONAL DESCRIPTION (continued)RE-TRIGGERED OPERATION
Whena second trigger pulse follows the firstits ef-
fect will dependon the stateof the multivibrator.If
the capacitor Cxis being charged the voltage level R/C external fallsto Vrefl again andQ remains
high i.e. the retrigger pulse arrivesina time shorter
than the period Rx⋅ Cx seconds, the capacitor
charging time constant.If the second trigger pulse very closeto the initial trigger pulse itis ineffective i.e. thesecond trigger must arrivein the capacitor
discharge cycletobe ineffective; Hence the mini-
mum time fora second triggerto be effective de-
pendson VCC and Cx.
RESETOPERATION isnormally high.If CLis low, the triggeris not ef-
fective becauseQ output goes low and trigger con-
trol flip-flopis reset.
Also transistor Opis turned on and Cxis charged
quickyto VCC. This meansif CL input goes low, the becomes waiting state bothin operating and non
operating state.
TRUTH TABLE
INPUTS OUTPUTS NOTE CL Q Q H OUTPUT ENABLE L H L H INHIBIT X H L H INHIBIT H OUTPUT ENABLE H OUTPUT ENABLE X L L H INHIBIT Don’tCareZ: HighImpedance
INPUT AND OUTPUT EQUIVALENT CIRCUIT
M54/M74HC123/123A
PIN DESCRIPTION
PIN No SYMBOL NAME AND FUNCTION9 1A,2A Trigger Inputs (Negative
Edge Triggered)10 1B,2B Trigger Inputs (Positive
Edge Triggered)11 1CLR,
2CLR
Direct Reset LOW and
Trigger Actionat Positive
Edge12 1Q,2Q Outputs (Active LOW)
72REXT/CEXT External Resistor
Capacitor Connection
13,5 1Q,2Q Outputs (Active HIGH)
14,6 1CEXT
2CEXT
External Capacitor
Connection 1REXT/CEXT External Resistor
Capacitor Connection GND Ground (0V) VCC Positive Supply Voltage
IEC LOGIC SYMBOL
ABSOLUTE MAXIMUM RATING
Symbol Parameter Value UnitVCC Supply Voltage -0.5to+7 V DC Input Voltage -0.5to VCC+ 0.5 V DC Output Voltage -0.5to VCC+ 0.5 V
IIK DC Input Diode Current ±20 mA
IOK DC Output Diode Current ±20 mA DC Output Source Sink Current Per Output Pin ±25 mA
ICCor IGND DC VCCor Ground Current ±50 mA Power Dissipation 500(*) mW
Tstg Storage Temperature -65to +150 oC Lead Temperature (10 sec) 300 oC
Absolute MaximumRatings arethose values beyond whichdamage tothedevicemayoccur.Functional operation under theseconditionisnotimplied.
(*)500 mW:≅65oC derate to300mWby 10mW/oC:65o Cto85oC
M54/M74HC123/123A
SPECIFICATIONSSymbol Parameter
Test Conditions Value
UnitVCC(V)
=25oC
54HC and 74HC
-40to85oC
74HC
-55to 125oC
54HC
Min. Typ. Max. Min. Max. Min. Max.VIH High Level Input
Voltage
2.0 1.5 1.5 1.54.5 3.15 3.15 3.15
6.0 4.2 4.2 4.2
VIL Low Level Input
Voltage
2.0 0.5 0.5 0.54.5 1.35 1.35 1.35
6.0 1.8 1.8 1.8
VOH High Level
Output Voltage
2.0 VI=
VIH
VIL
IO=-20μA
1.9 2.0 1.9 1.94.5 4.4 4.5 4.4 4.4
6.0 5.9 6.0 5.9 5.9
4.5 IO=-4.0 mA 4.18 4.31 4.13 4.10
6.0 IO=-5.2 mA 5.68 5.8 5.63 5.60
VOL Low Level Output
Voltage
2.0 VI=
VIH
VIL
IO=20μA
0.0 0.1 0.1 0.14.5 0.0 0.1 0.1 0.1
6.0 0.0 0.1 0.1 0.1
4.5 IO= 4.0 mA 0.17 0.26 0.33 0.40
6.0 IO= 5.2 mA 0.18 0.26 0.33 0.40 Input Leakage
Current 6.0 VI =VCCor GND ±0.1 ±1 ±1 μA R/C TerminalOff
State Current 6.0 VI =VCCor GND ±0.1 ±1 ±1 μA
ICC Quiescent Supply
Current
6.0 VI =VCCor GND 4 40 80 μA
ICC’ Active State
Supply Current(1)
2.0 VI =VCCor GND
Pin7or15
VIN =VCC/2 200 260 320 μA
4.5 500 600 780 960 μA
6.0 0.7 1 1.3 1.6 mA
RECOMMENDED OPERATING CONDITIONS
Symbol Parameter Value UnitVCC Supply Voltage 2to6 V Input Voltage 0to VCC V Output Voltage 0to VCC V
Top Operating Temperature:
M54HC Series
M74HC Series
-55to +125
-40to +85CC
tr,tf Input Rise and Fall Time 0to 1000 nsto 500to 400 External Capacitor NO LIMITATION pF External Resistor VCC <3V 5Kto 1M Ω
VCC≥3V 1Kto 1M
(*) The maximum allowable values ofCxand Rxarea functionofleakageof capacitorCx,the leakageof deviceand leakageduetothe board
layoutand surface resistance. Susce ptibility toexternally induced noisemay occurforRx> 1MΩ
M54/M74HC123/123A
ELECTRICAL CHARACTERISTICS (CL =50 pF, Inputtr =tf =6 ns)
Symbol Parameter
Test Conditions Value
UnitVCC(V)
=25oC
54HC and 74HC
-40to85oC
74HC
-55to 125oC
54HC
Min. Typ. Max. Min. Max. Min. Max.tTLH
tTHL
Output Transition
Time
2.0 30 75 95 1104.5 8 151922
6.0 7 131619
tPLH
tPHL
Propagation
Delay Time
(A,B-Q,Q)
2.0 102 210 265 3154.5 29 42 53 63
6.0 22 36 45 54
tPLH
tPHL
Propagation
Delay Time
(CLRTRIGGER-Q,Q)
2.0 102 235 295 3554.5 31 47 59 71
6.0 23 40 50 60
tPLH
tPHL
Propagation
Delay Time
(CLR-Q,Q)
2.0 68 160 200 2404.5 20 32 40 48
6.0 16 27 34 41
tWOUT Output Pulse
Width
(for HC123)
2.0 CX= 100pF =10 KΩ
1.44.5 1.2
6.0 1.1
2.0 CX= 0.1μF= 100 KΩ
4.64.5 4.4
6.0 4.3
tWOUT Output Pulse
Width
(for HC123A)
2.0 CX= 100pF =10 KΩ
1.94.5 1.6
6.0 1.5
2.0 CX= 0.1μF= 100 KΩ
9.84.5 9.5
6.0 9.4
ΔtWOUT Output Pulse
Width Error
Between Circuits Same Package
tW(H)
tW(L)
Minimum Pulse
Width
2.0 75 95 1104.5 15 19 22
6.0 13 16 19
tW(L) Minimum Pulse
Width (CLR)
2.0 75 95 1104.5 15 19 22
6.0 13 16 19
trr Minimum
Retrigger Time
2.0 CX= 100pF =1 KΩ
3254.5 108
6.0 78
2.0 CX= 0.1μF= 100 KΩ4.5 1.4
6.0 1.2
CIN Input Capacitance 5 10 10 10 pF
CPD(*) Power Dissipation
Capacitance
162 pF
(*) CPD isdefinedasthe valueofthe IC’sinternal equivalent capacitance which iscalculated fromthe operatingcurrent consumption without load.
M54/M74HC123/123A
