~yne {yz SGS-THOMSON 7 iicRoeLecrromes M54HC423/423A M74HC423/423A DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR a HIGH SPEED tepp = 25 ns (TYP) at Vcc = 5V a LOW POWER DISSIPATION STANDBY STATE Icc=4 WA (MAX.) AT Ta=25C ACTIVE STATE lIcc = 700 WA (MAX.) AT Voc=5V a HIGH NOISE IMMUNITY Vln = Vnit = 28 % Voc (MIN.) a OUTPUT DRIVE CAPABILITY 10 LSTTL LOADS a SYMMETRICAL OUTPUT IMPEDANCE low = lo. = 4 mA (MIN.) s BALANCED PROPAGATION DELAYS TPLH = tPHL . a WIDE OPERATING VOLTAGE RANGE Vcc (OPR) = 2 VTO6 V a WIDE OUTPUT PULSE WIDTH RANGE twout = 120 ns ~ 60 s OVER AT Vcc = 4.5 V a PIN AND FUNCTION COMPATIBLE WITH 54/74LS423 DESCRIPTION The M54/74HC423/423A are high speed CMOS MONOSTABLE multivibrators fabricated with silicon gate C?MOS technology. They achieve the high speed operation similar to equivalent LSTTL while maintaining the CMOS low power dissipation. There are two trigger inputs, A INPUT (negative edge) and B INPUT (positive edge). These inputs are valid for rising/falling signals, (tr tp- 1 sec). After triggering the output maintains the MONOSTABLE state for the time period determined by the external resistor Rx and capacitor Cx. Two different pulse width constant are available: K = 0.46 for HC423 = K=1 for HC423A. Taking CLR low breaks this MONOSTABLE STATE. If the next trigger pulse occurs during the MONOSTABLE period it makes the MONOSTABLE period longer. Limit for values of Cx and Rx : Cx : NO LIMIT Rx: Veco <3.0V5KQt01MQ Veco 23.0V1KQt01MQ All inputs are equipped with protection circuits against static discharge and transient excess voltage. October 1993 BIR FIR (Plastic Package) (Ceramic Package) > M1R C1R (Micro Package) (Chip Carrier) ORDER CODES : M54HCXXXF1IR M74HCXXXM1R M74HCXXXB1R M74HOXXXC1R PIN CONNECTIONS (top view) Ld TB Pm 1B Ey 5] YREXT/CEXT YCLR pI CLR ] 1 CEXT g 1a fF: -- Ct] 10 20 i+ oH 70 a 2CEXT El cca} fr] 2 CLR mo 2 REXTICERT |? bo} GND Oo f=) ICEXT 1a NC 20 TCLR NC = No Internal Connection 2 REXTICEXT [> GND c A 8 1/9 825M54/M74HC423/423A SYSTEM DIAGRAM TIMING CHART Yee VaerH -_ Vrer b - + ss 2] twout You ' YOH LI -- Yar t otre | twours | 5 -10176/1 2/9 826 SGS-THOMSON ky MICROELECTRONICSM54/M74HC423/4234 BLOCK DIAGRAM Hh pO 4 ee 14 15 sg 2{ 0) ~y Cx RHI/Cx Hy 3 DO p| 5-10091/1 CLR Note : (1) Cx, Rx, Dx are extemal components. (2) Dx is a clamping diode. t 2 (Voc 0.7). Cx/20mA The extemal capacitor is charged to Vcc in the stand-by state, i.e. no trigger. When the supply voltage is turned off Cx is discharged mainly through an intemal parasitic diode (see figures). If Cx is sufficiently large and Voc 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 can be calculated as follows : In cases where tis too short an externa! clamping diode is required to protect the I.C. from the surge current. Dx -> a Cx J ' Rx ' ah ec 6 7 Cx Rx/Cx Sg 9 - e 10] 2 1- G $-1009 2/1 CLR FUNCTIONAL DESCRIPTION STAND-BY STATE The external capacitor, Cx, is fully charged to Vcc in the stand-by state. Hence, before triggering, transistor Qp 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} Ais "low" and B has a falling edge ; 2 nd) Bis "high" and A has a rising edge ; 3rd) Aislow and Bis high and Ci has a rising edge. After the multivibrator has been retriggered comparator 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 Vrer. 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 extemal components Rx, Cx. Triggering the multivibrator causes Q to go high after internal delay due to the flip-flop and the gate. Q remains high until the voltage at R/C external rises again to Vrern. 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 returns to VREFH the multivibrator has returned to its MONOSTABLE STATE. In the case where Rx - Cx are large enough and the discharge time of the capacitor and the delay time in the I.C. can be ignored, the width of the output pulse tw (out) is as follows : = 0.46 Cx . Rx (HC423) Cx - Rx (HC423A) twouT) = twouT) = . 3/9 Ay SSScasseanes 827M54/M74HC423/423A FUNCTIONAL DESCRIPTION (continued) RE-TRIGGERED OPERATION When a second trigger pulse follows the first its effect 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 ; ie. the second trigger must arrive in the capacitor discharge cycle to be ineffective; Hence the TRUTH TABLE minimum time for a second trigger to be effective depends on Vcc and Cx. RESET OPERATION CL is normally high. If CL is low, the trigger is not effective because Q output goes low and trigger control 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. T . INPUTS _ _ OUTPUTS _ NOTE A B CL Q Q 7 H H SJL LI OUTPUT ENABLE x L H L H INHIBIT H x H | L H INHIBIT L an H JL LJ OUTPUT ENABLE X x L L H INHIBIT X: Don't Care Z: High impedance INPUT AND OUTPUT EQUIVALENT CIRCUIT Vee INPUT GND qe i | ! OUTPUT 4 ; SCOSAsO 4/9 &r SGS-THOMSON MICROELECTROMECS 828PIN DESCRIPTION M54/M74HC423/423A IEC LOGIC SYMBOL PIN No SYMBOL NAME AND FUNCTION 1,9 1A, 2A Trigger Inputs (Negative a Edge Triguoted) 9 1A oo o S JL (13) 2, 10 1B, 2B Trigger inputs (Positive 1B ++ H 19 _ Edge Triggered) icp (3) wh 3,114 1CLR, Direct Reset (Active LOW) (14) (4) _ 2CLR ee 1Cx CX P10 4, 12 1Q,2Q | Outputs (Active LOW) 1RX/CX (15) | RX/CX 7 2Rext/Cext | External Resistor Capacitor Connection oA (oY o & STL 13,5 1Q,2Q | Outputs (Active HIGH) op (12) > (5) 4g 14,6 1c External Capacitor oCext Connection CuR (oy R (12) 15 1Rext/Cexr ; External Resistor 2CX (6) cx P=" 99 : Capacitor Connection 2RX/CX (7) RX /CX 8 GND Ground (OV) - 16 Vcc Positive Supply Voltage te15070 ABSOLUTE MAXIMUM RATING Symbol Parameter Value Unit Voc Supply Voltage -0.5 to +7 Vv Vi DC Input Voltage _ -0.5 to Vec + 0.5 Vv Vo DC Output Voltage -0.5 to Vec + 0.5 Vv lik DC Input Diode Current +20 mA lox DC Output Diode Current +20 mA lo DC Output Source Sink Current Per Output Pin + 25 mA cc or leno | DC Vcc or Ground Current + 50 mA Po Power Dissipation 500 (*) mw Tstg Storage Temperature -65 to +150 C TL Lead Temperature (10 sec} 300 C | Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditionis notimplied. (*) 500 mW: = 65 C derate to 300 mW by 10mW/C: 65 C to 85 C iy SGS-THOMSON MICROELECTRONICS 5/9 829M54/M74HC423/423A RECOMMENDED OPERATING CONDITIONS Symbol Parameter Value Unit | Vec Supply Voltage 2to6 Vv vi Input Voltage 0 to Voc v Vo Output Voltage 0 to Voc v Top Operating Temperature: M54HC Series -55 to +125 C LL _ _ _M74HC Series - -40 to +85 - | tr tr input Rise and Fall Time 0 to 1000 ns 0 to 500 ab : 0 to 400 Cx External Capacitor NO LIMITATION Rx External Resistor Veo<2V | 5K to 1M (*) Q Veco 23 V 1K to 1M (*) (*) The maximum allowable values of Cx and Rx are a function of leakage of capacitor Cx, the leakage of device and leakage due to the board layout and surface resistance. Susceptibility to externally induced noise may occur for Rx > 1MQ DC SPECIFICATIONS Test Conditions Value Symbol Parameter Voc Ta = 25C -40 to 85 C |-55 to 125C) Unit (V) 54HC and 74HC 74HC 54HC Min. | Typ. | Max. | Min. | Max. | Min. | Max. Vin High Level Input | 2.0 | 1.5 1.5 1.5 Voltage 45 3.15 3.15 3.15 v 6.0 4.2 4.2 4.2 Vit Low Level Input |_2.0 | ae 0.5 0.5 0.5 Voltage 45 1.35 1.35 135 | Vv 6.0 1.8 1.8 1.8 Vou High Level 2.0 Vi= 1.9 2.0 1.9 1.9 Output Voltage | 4.5 | Vin lo=20UA 44 45 | 44 4.4 6.0 | or 5.9 6.0 5.9 5.9 v 4.5 | Vit {lo=-4.0 mA] 4.18 | 4.31 4.13 4.10 6.0 lo=-5.2 MA| 5.68 | 5.8 5.63 5.60 VoL Low Level Output | 2.0 Vie 0.0 0.1 0.1 0.1 Voltage 4.5 | yy, | = 20HA 0.0 | 0.4 O.1 o.4 | 6.0 | or 0.0 | 0.1 0.1 0.4 v 45] Vi lo= 4.0 mA 0.17 | 0.26 0.33 0.40 6.0 lo= 5.2 mA 0.18 | 0.26 0.33 0.40 I Input Leakage 6.0 Vi = Vee or GND +0.1 +1 +1 pA Current ~ ; hi R/C Terminal Off 6.0 Vi = Voc or GND +01 +H +H pA State Current loc Quiescent Supply 6.0 | Vi = Vcc or GND 4 40 80 pA Current loc Active State 2.0 | Vi = Vcc or GND 45 200 260 325 HA Supply Current (1) | 45 Pin 7 or 15 400 | 500 650 810 uA 6.0 | VIN= Vel 07 | 1.0 1.3 1.6 | mA (1): Per Circuit 6/9 37 Sieontemones 830M54/M74HC423/423) AC ELECTRICAL CHARACTERISTICS (C. = 50 pF, input tr = tr = 6 ns) r _ ee t- Test Conditions Value Symbol P t Ta = 25C -A0 to 85 C |-55 to 125C | Unit Yywe arameter wn S4HC and 74HC 74HC 54HC | | Min. | Typ. | Max. Min. | Max. | ttt Output Transition | 2.0 | 30 7 tTHL Time 45 8 15 |__ __| 6.0 | a . tPLH Propagation | 2.0 | TPL Delay Time_ 45 (A, B-Q,Q) 6.0 | L teLH Propagation 2.0 TPHL Delay Time_ 45 (CLR - Q, Q) ' 6.0 Po OY twout | Output Pulse 2.0 Cx = 100 pF Width 45 Rx = 10 KQ (for HC423) leq | 6.0 1 | (20! Cx=0.1pF as _ 45 Rx = 100 KQ 46 ms | 6.0 | 4.5 twour | Output Pulse 2.0 ' Cx=100 pF _ 17 | | Width 4. Rx = 10 KQ 14 us (for HC423A) fas Eb tf 13 oe | 2.0) Cx=O.1uF 10 TT | x= 0.1 _ _ | 45 Rx = 100 KQ 95 ms ; | Output Pulse Width Error Between Circuits | in Same Package ! twiH) Minimum Pulse 2.0 tw) Width 4.5 (ssi: CO twu) Minimum Pulse 2.0 | Width 45 % 6.0 tre Minimum 2.0 = Retrigger Time 45 = a | | Cx =0.1nF 5 | | Rx = 100 KQ 1.4 ee ee ee Cin Input Capacitance | * 5 10 | Cpp (*) | Power Dissipation | 160 pF Capacitance | (*) Cen is defined as the value of the ICs internal equivalent capacitance which is calculated from the operating current consumption without load. (Refer to Test Circuit). Average operting currentcan be obtained by the following equation. loc(opr) = Crp * Voc * fin + loc Duty/100 + Ic/2 (per monostable) {Icc: Active Supply Current) (Duty:%) ks SGS-THOMSON 79 7 MICROELECTRONICS 831M54/M74HC423/423A Output Pulse Width Constant Characteristics (for HC-423) GC56640 K Ry =10KQ C. =50pF 0.6 Cy =10nF 0.5 Tur 0.4 0.3 2 3 4 5 Vec(V) Output Pulse Width Characteristics (for HC423) GC56590 Output Pulse Width Constant Characteristics (for HC423A) GCS6650 K Ry =10KQ CL =50pF Cy =10nF Cy > 0.1 uF 0.9 0.8 2 3 4 5 Vec(V) Output Pulse Width Characteristics (for HC423A) GC56600 tw(ms) tw(ms) 103 Veo =4.5V Rx =1MQ 102 Vec =4.5V Rx =1MQ C, =50pF Cy =50pF 107 10? 10 Ry =100KQ io 'L Rx=100Ka Rx =10KQ Ry =10K 6 a 10 10 10 10 107 10 107 10 io* 10 10 10 10! 107 Cx (nF) 10! 10 10 | 107 Cx (nF) 8/9 {7 SGS-THOMSON Tf iacromectronics 832TEST CIRCUIT Icc (Opr) 8 500 Ll IRKICX M54/M74HC423/423. Yee vq (Ye H 2ct 1a } 18 1A ia 2cx 2a/ 2RXICX 1cx 27a -} 2h 28 GND S-10079 * TRANSITION TIME OF INPUT WAVEFORM IS THE SAME AS THAT IN SASE OF SWITCHING CHARACTERISTICS TESTS. SWITCHING CHARACTERISTICS TEST WAVEFORM - Yee Pl wa 3 wo 3 9] ons 90% 10% cLR 2| a 90 %o 1% hy SGS-THO 99 MICROELECTROMICS 833