M74HC123A

M54HC123 STMICROELECTRONICS | Alldatasheet

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DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR B1R (Plastic Package) ORDER CODES : M54HCXXXF1R M74HCX XXM1R M74HCXXXB1R M74HCXXXC1R F1R (Ceramic Package) M1R (Micro Package) C1R (Chip Carrier) PIN CONNECTIONS (top view) NC = No Internal Connecti on .HIGH SPEED tPD = 25 ns (TYP) at VCC =5 V .LOW POWER DISSIPATION STANDBYSTATE I CC =4 µA (MAX.) AT TA=25°C ACTIVESTATE I CC = 200µA (TYP.) AT VCC =5V .HIGH NOISE IMMUNITY VNIH =V NIL =2 8%V CC (MIN.) .OUTPUT DRIVE CAPABILITY

10 LSTTL LOADS

.SYMMETRICAL OUTPUT IMPEDANCE I OH =IOL = 4 mA (MIN.) .BALANCED PROPAGATION DELAYS t PLH =tPHL .WIDE OPERATING VOLTAGE RANGE V CC (OPR) = 2 V TO 6 V .WIDE OUTPUT PULSE WIDTH RANGE t WOUT = 120 ns∼ 60 s OVER AT VCC = 4.5 V .PIN AND FUNCTION COMPATIBLE WITH 54/74LS1 23 The M54/74HC123 is a high speed CMOS MONO- STABLE multivibrator fabricated with silicon gate C 2MOS technology. It achieves the high speed operation similar to equivalent LSTTL while main- taining the CMOS low power dissipation. There are two trigger inputs, A INPUT (negative edge) and 8 INPUT (positive edge). These inputs are valid for slow rising/falling signals, (tr = tf = I sec). The device may also be triggered by using the CLR input (posi- tive-edge) because of the Schmitt-trigger input ; after triggering the output maintains the MONO- STABLE state for the time period determined by the external resistor Rx and capacitor Cx. When Cx≥ 10nF and Rx≥ 10KΩ , the output pulse width value is approssimatively given by the formula: tw(out)=K

• Cx • Rx. Two different pulse width constant are available: K ≅ 0.45 for HC123 K≅ 1 for HC123A. Taking CLR low breaks this MONOSTABLE STATE. If the next trigger pulse occurs during the MONOSTABLEperiod it makes the MONOSTABLE period longer. Limit for values of Cx and Rx : Cx : NO LIMIT Rx : VCC < 3.0 V 5 KΩ to 1 M Ω VCC ≥ 3.0 V 1 K Ω to 1 M Ω All inputs are equipped with protection circuits

DESCRIPTION

Note : (1) Cx, Rx, Dx are external components. (2) Dx is a clamping diode. The external capacitor ischarged toV CC inthe stand-by state, i.e. no trigger. When the supply voltage is turned off Cx is discharged mainly through an internal parasitic diode (see figures). If Cx is sufficiently large and VCC decreases rapidy, there will be some possibility of da- maging the I.C. with a surge current or latch-up. If the voltage supply filter capacitor is large enough and VCC decrease slowly, the surge current is automatically limited and damage the I.C. is avoided. The maximum forward current of the parasitic diode is approximately 20 mA. In cases where Cx is large the time taken for the supply voltage to fall to 0.4 VCC canbe calculated as follows : tf≥ (VCC –0 . 7 )⋅Cx/20mA In cases where tf is too short an external clamping diode is required to protect the I.C. from the surge current. FUNCTIONAL DESCRIPTION STAND-BY STATE The external capacitor, Cx, is fully charged to VCC in the stand-by state. Hence, before triggering, tran- sistorQp and Qn (connected to 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 current is therefore only leakage current. TRIGGER OPERATION Triggering occurs when : 1 st) A is ”low” and B has a falling edge ; 2 nd) B is ”high” and A has a rising edge ; 3 rd) A is low and B is high and C1 has a rising edge. After the multivibrator has been retriggered com- parator C1 and C2 start operating and Qn is turned on. Cx then discharges through Qn. The voltage at the node R/C external falls. When it reaches V REFL the output of comparator C1 becomes low. This in turn resets the flip-flop and Qn is turned off. At this point C1 stops functioning but C2 continues to operate. The voltage at R/C external begins to rise with a time constant set by the external components Rx, Cx. Triggering the multivibrator causes Qto go high after internal delay due to the flip-flop and the gate. Q re- mains high until the voltage at R/C external rises again to V REFH . At this point C2 output goes low and O goes low. C2 stop operating. That means that after triggering when the voltage R/C external re- turns to V REFH the multivibrator has returned to its MONOSTABLE STATE. In the case where Rx⋅Cx are large enough and the discharge time of the ca- pacitorand the delay time in the I.C. can be ignored, the width of the output pulse tw (out) is as follows : t W(OUT) = 0.46 Cx⋅Rx (HC123) tW(OUT) =C x⋅Rx (HC123A) M54/M74HC123/123A

FUNCTIONAL DESCRIPTION (continued) RE-TRIGGERED OPERATION When a second trigger pulse follows the first its ef- fect will depend on the state of the multivibrator. If the capacitor Cx is being charged the voltage level of R/C external falls to Vrefl again and Q remains high i.e. the retrigger pulse arrives in a time shorter than the period Rx⋅ Cx seconds, the capacitor charging time constant. If the second trigger pulse is very close to the initial trigger pulse it is ineffective ; i.e. the second trigger must arrive in the capacitor discharge cycle to be ineffective; Hence the mini- mum time for a second trigger to be effective de- pends on V CC and Cx. RESET OPERATION CL is normally high. If CL is low, the trigger is not ef- fective because Q output goes low and trigger con- trol flip-flop is reset. Also transistor Op is turned on and Cx is charged quicky to VCC . This means if CL input goes low, the IC becomes waiting state both in operating and non operating state. TRUTH TABLE INPUTS OUTPUTS NOTE AB C L QQ H H OUTPUT ENABLE X L H L H INHIBIT H X H L H INHIBIT L H OUTPUT ENABLE L H OUTPUT ENABLE X X L L H INHIBIT X: Don’t Care Z: High Impedance INPUT AND OUTPUT EQUIVALENT CIRCUIT M54/M74HC123/123A

PIN No SYMBOL NAME AND FUNCTION 1, 9 1A, 2A Trigger Inputs (Negative Edge Triggered) 2, 10 1B, 2B Trigger Inputs (Positive Edge Triggered) 3, 11 1CLR, 2CLR Direct Reset LOW and Trigger Action at Positive Edge 4, 12 1Q, 2Q Outputs (Active LOW)

72 R EXT /CEXT External Resistor

13, 5 1Q, 2Q Outputs (Active HIGH) 14, 6 1C EXT 2C EXT External Capacitor Connection 15 1R EXT /CEXT External Resistor Capacitor Connection

8 GND Ground (0V)

16 V CC Positive Supply Voltage

Symbol Parameter Value Unit VCC Supply Voltage -0.5 to +7 V VI DC Input Voltage -0.5 to V CC + 0.5 V VO DC Output Voltage -0.5 to V CC + 0.5 V IIK DC Input Diode Current ± 20 mA IOK DC Output Diode Current ± 20 mA IO DC Output Source Sink Current Per Output Pin ± 25 mA ICC or IGND DC V CC or Ground Current ± 50 mA P D Power Dissipation 500 (*) mW Tstg Storage Temperature -65 to +150 oC TL Lead Temperature (10 sec) 300 oC Absolute MaximumRatings are those values beyond whichdamage tothe device may occu r. Functional operation under these condition isnotimplied. (*) 500 mW:≅ 65 oC derate to 300 mW by 10mW/oC: 65oCt o 8 5oC M54/M74HC123/123A

(V) TA =2 5oC 54HC and 74HC -40 to 85oC 74HC -55 to 125oC 54HC VIH High Level Input Voltage 2.0 1.5 1.5 1.5 V4.5 3.15 3.15 3.15 6.0 4.2 4.2 4.2 V IL Low Level Input Voltage 2.0 0.5 0.5 0.5 V4.5 1.35 1.35 1.35 6.0 1.8 1.8 1.8 V OH High Level Output Voltage

2.0 VI =

IO =-20µA 1.9 2.0 1.9 1.9 V VOL Low Level Output Voltage IO =2 0µA 0.0 0.1 0.1 0.1 V 4.5 I II Input Leakage Current 6.0 VI =V CC or GND ±0.1 ±1 ±1 µA II R/C Terminal Off State Current 6.0 VI =V CC or GND ±0.1 ±1 ±1 µA ICC Quiescent Supply Current

6.0 V I =V CC or GND 4 40 80 µA

ICC ’ Active State Supply Current (1)

2.0 V I =V CC or GND

VIN =V CC /2 45 200 260 320 µA 4.5 500 600 780 960 µA 6.0 0.7 1 1.3 1.6 mA (1):Per Circuit RECOMMENDED OPERATING CONDITIONS Symbol Parameter Value Unit VCC Supply Voltage 2 to 6 V VI Input Voltage 0 to V CC V VO Output Voltage 0 to V CC V Top Operating Temperature:M54HC Series M74HC Series -55 to +125 -40 to +85 oC oC tr,tf Input Rise and Fall Time 0 to 1000 ns 0 to 500 0 to 400 C X External Capacitor NO LIMITATION pF R X External Resistor V CC <3V 5 Kt o1 M Ω VCC ≥ 3 V 1K to 1M (*) The maximum allowable values of Cx and Rx are a function of leakage of capa citor Cx, the leakage of device and leakage due to the board layout and surface resistance. Susce ptibility to externally induced noise may occur for Rx > 1MΩ M54/M74HC123/123A

AC ELECTRICAL CHARACTERISTICS (CL =5 0p F ,I n p u ttr =t f =6n s ) Symbol Parameter Test Conditions Value UnitVCC (V) TA =2 5oC 54HC and 74HC -40 to 85oC 74HC -55 to 125oC 54HC tTLH tTHL Output Transition Time 2.0 30 75 95 110 ns4 . 5 8 1 51 92 2 6 . 0 7 1 31 61 9 tPLH tPHL Propagation Delay Time (A, B - Q, Q) 2.0 102 210 265 315 ns4.5 29 42 53 63 6.0 22 36 45 54 t PLH tPHL Propagation Delay Time (CLR TRIGGER - Q, Q) 2.0 102 235 295 355 ns4.5 31 47 59 71 6.0 23 40 50 60 t PLH tPHL Propagation Delay Time (CLR - Q, Q) 2.0 68 160 200 240 ns4.5 20 32 40 48 6.0 16 27 34 41 t WOUT Output Pulse Width (for HC123)

2.0 C X = 100 pF

R X =1 0K Ω 1.4 µs4.5 1.2 6.0 1.1 2.0 C X = 0.1µF R X = 100 KΩ 4.6 ms4.5 4.4 6.0 4.3 tWOUT Output Pulse Width (for HC123A) 2.0 C X = 100 pF R X =1 0K Ω 1.9 µs4.5 1.6 6.0 1.5 2.0 C X = 0.1µF R X = 100 KΩ 9.8 ms4.5 9.5 6.0 9.4 ΔtWOUT Output Pulse Width Error Between Circuits in Same Package t W(H) tW(L) Minimum Pulse Width 2.0 75 95 110 ns4.5 15 19 22 6.0 13 16 19 tW(L) Minimum Pulse Width (CLR) 2.0 75 95 110 ns4.5 15 19 22 6.0 13 16 19 trr Minimum Retrigger Time R X =1K Ω 325 ns4.5 108 6.0 78 2.0 C X = 0.1µF R X = 100 KΩ µs4.5 1.4 6.0 1.2 C IN Input Capacitance 5 10 10 10 pF C PD (*) Power Dissipation Capacitance 162 pF (*) CPD is defined as the value of the IC’s internal equivalent capac itance which is calculated from the operating current consump tion without load. (RefertoTestCircuit).Average opertingcurrent canbeobtained bythefollowing equation. ICC (opr) =CPD •VCC •fIN+ICC ’ Duty/100 + IC /2(per monostable) (ICC ’: Active Supply Current) (Duty:%) M54/M74HC123/123A

Output Pulse Width Constant Characteristics (for HC123) Output Pulse Width Characteristics (for HC123) Output Pulse Width Constant Characteristics (for HC123A) Output Pulse Width Characteristics (for HC123A) M54/M74HC123/123A

TEST CIRCUIT ICC (Opr) * TRANSITION TIME OF INPUT WAVEFORM IS THE SAME AS THAT IN SASE OF SWITCHINGCHARACTERISTICS TESTS. SWITCHING CHARACTERISTICS TEST WAVEFORM M54/M74HC123/123A

Plastic DIP16 (0.25) MECHANICAL DATA DIM. mm inch a1 0.51 0.020 B 0.77 1.65 0.030 0.065 b 0.5 0.020 b1 0.25 0.010 D 20 0.787 E 8.5 0.335 e 2.54 0.100 e3 17.78 0.700 F 7.1 0.280 I 5.1 0.201 L 3.3 0.130 Z 1.27 0.050 P001C M54/M74HC123/123A

Ceramic DIP16/1 MECHANICAL DATA DIM. mm inch A 20 0.787 B 7 0.276 D 3.3 0.130 E 0.38 0.015 e3 17.78 0.700 F 2.29 2.79 0.090 0.110 G 0.4 0.55 0.016 0.022 H 1.17 1.52 0.046 0.060 L 0.22 0.31 0.009 0.012 M 0.51 1.27 0.020 0.050 N 10.3 0.406 P 7.8 8.05 0.307 0.317 Q 5.08 0.200 P053D M54/M74HC123/123A

SO16 (Narrow) MECHANICAL DATA DIM. mm inch A 1.75 0.068 a1 0.1 0.2 0.004 0.007 a2 1.65 0.064 b 0.35 0.46 0.013 0.018 b1 0.19 0.25 0.007 0.010 C 0.5 0.019 c1 45 ° (typ.) D 9.8 10 0.385 0.393 E 5.8 6.2 0.228 0.244 e 1.27 0.050 e3 8.89 0.350 F 3.8 4.0 0.149 0.157 G 4.6 5.3 0.181 0.208 L 0.5 1.27 0.019 0.050 M 0.62 0.024 S8 ° (max.) P013H M54/M74HC123/123A

DIM. mm inch A 9.78 10.03 0.385 0.395 B 8.89 9.04 0.350 0.356 D 4.2 4.57 0.165 0.180 d1 2.54 0.100 d2 0.56 0.022 E 7.37 8.38 0.290 0.330 e 1.27 0.050 e3 5.08 0.200 F 0.38 0.015 G 0.101 0.004 M 1.27 0.050 M1 1.14 0.045 P027A M54/M74HC123/123A

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