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| IN74HC123 DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR The IN74HC123 is identical in pinout to the LS/ALS123. The device inputs are compatible with standard CMOS outputs; with pullup resistors, they are compatible with LS/ALSTTL outputs. There are two trigger inputs, A INPUT (negative edge) and B INPUT (positive edge). These inputs are valid for rising/falling signals. The device may also be triggered by using the CLR input (positive-edge) because of the Schmitt-trigger input; after triggering the output maintains the MONOSTABLE state for the time period determined by the external resistor RX and capacitor CX. Taking CRL low breaks this MONOSTABLE STATE. If the next trigger pulse occurs during the MONOSTABLE period it makes the MONOSTABLE period longer. Outputs Directly Interface to CMOS, NMOS, and TTL Operating Voltage Range: 3.0 to 6.0 V Low Input Current: 1.0 A High Noise Immunity Characteristic of CMOS Devices LOGIC DIAGRAM * * * * ORDERING INFORMATION IN74HC123N Plastic IN74HC123D SOIC TA = -55 to 125 C for all packages PIN ASSIGNMENT PIN 16 =VCC PIN 8 = GND FUNCTION TABLE Inputs Outputs Note A B CRL Q Q 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 * - except for monostable period Note (1) CX, RX, DX are external components. (2) DX is a clamping diode. The external 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 internal parasitic diode. If CX is sufficiently large and VCC decreases rapidy, there will be some possibility of damaging 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. 1 IN74HC123 MAXIMUM RATINGS* Symbol Parameter Value Unit VCC DC Supply Voltage (Referenced to GND) -0.5 to +7.0 V VIN DC Input Voltage (Referenced to GND) -1.5 to VCC +1.5 V VOUT DC Output Voltage (Referenced to GND) -0.5 to VCC +0.5 V IIN DC Input Current, per Pin A, B, CLR mA 20 CX, RX 30 IOUT DC Output Current, per Pin mA 25 ICC DC Supply Current, VCC and GND Pins mA 50 PD Power Dissipation in Still Air, Plastic DIP+ 750 mW SOIC Package+ 500 Tstg Storage Temperature -65 to +150 C 260 TL Lead Temperature, 1 mm from Case for 10 C Seconds (Plastic DIP or SOIC Package) * Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the Recommended Operating Conditions. +Derating - Plastic DIP: - 10 mW/C from 65 to 125C SOIC Package: : - 7 mW/C from 65 to 125C RECOMMENDED OPERATING CONDITIONS Symbol Parameter VCC DC Supply Voltage (Referenced to GND) VIN, VOUT DC Input Voltage, Output Voltage (Referenced to GND) TA Operating Temperature, All Package Types t r, tf Input Rise and Fall Time CRL VCC =2.0 V VCC =4.5 V (Figure 2) VCC =6.0 V A or B Min 3.0 ** 0 -55 0 0 0 Max 6.0 VCC Unit V V +125 C ns 1000 500 400 No Limit RX External Timing Resistor VCC <4.5 V 10 1000 k 2.0 1000 VCC 4.5 V CX External Timing Capacitor 0 No F Limit ** The IN74HC123 will function at 2.0 V but for optimum pulse width stability, VCC should be above 3.0 V. This device contains protection circuitry to guard against damage due to high static voltages or electric fields. However, precautions must be taken to avoid applications of any voltage higher than maximum rated voltages to this high-impedance circuit. For proper operation, VIN and VOUT should be constrained to the range GND(VIN or VOUT)VCC. Unused inputs must always be tied to an appropriate logic voltage level (e.g., either GND or VCC). Unused outputs must be left open. 2 IN74HC123 DC ELECTRICAL CHARACTERISTICS(Voltages Referenced to GND) Guaranteed Limit VCC Symbol Parameter Test Conditions V 85 125 25 C to C C -55C 1.5 1.5 1.5 2.0 VIH Minimum High- VOUT=0.1 V or VCC-0.1 3.15 3.15 3.15 4.5 Level Input V 4.2 4.2 4.2 6.0 Voltage IOUT 20 A 0.5 0.5 0.5 2.0 VIL Maximum Low - VOUT=0.1 V or VCC-0.1 1.35 1.35 1.35 4.5 Level Input V 1.8 1.8 1.8 6.0 Voltage IOUT 20 A 1.9 1.9 1.9 2.0 VOH Minimum High- VIN=VIH or VIL 4.4 4.4 4.4 4.5 Level Output IOUT 20 A 5.9 5.9 5.9 6.0 Voltage VIN=VIH or VIL 3.7 3.84 3.98 4.5 IOUT 4.0 mA 5.2 5.34 5.48 6.0 IOUT 5.2 mA 0.1 0.1 VIN=VIH or VIL 0.1 VOL Maximum 2.0 0.1 0.1 0.1 Low-Level 4.5 IOUT 20 A 0.1 0.1 0.1 Output Voltage 6.0 VIN=VIH or VIL 0.4 0.33 0.26 4.5 IOUT 4.0 mA 0.4 0.33 0.26 6.0 IOUT 5.2 mA VIN=VCC or GND IIN Maximum 6.0 0.1 1.0 1.0 Input Leakage Current (A, B, CRL ) IIN Maximum 6.0 VIN=VCC or GND 50 500 500 Input Leakage Current (RX, CX) VIN=VCC or GND 6.0 130 220 350 ICC Maximum Quiescent Q1 and Q2 = Low Supply Current IOUT=0A (per Package) Standby State 25C -45C to -55C to 85C 125C VIN=VCC or GND 6.0 400 600 800 ICC Maximum Supply Current Q1 and Q2 = High (per Package) IOUT=0A Active State Pins 15 and 7 = 0.5 VCC Unit V V V V A nA A A 3 IN74HC123 AC ELECTRICAL CHARACTERISTICS(CL=50pF,Input tr=tf=6.0 ns) Guaranteed Limit VCC Symbol Parameter V 85 125 25 C to C C -55C 385 320 255 tPLH, Maximum Propagation Delay, Input A or 2.0 75 65 50 tPHL 4.5 B to Q or Q (Figures 1 and 3) 65 55 45 6.0 325 270 215 tPLH, 2.0 Maximum Propagation Delay , CRL to Q 65 55 45 tPHL 4.5 or Q (Figures 2 and 3) 55 45 35 6.0 110 95 75 tTLH, tTHL Maximum Output Transition Time, Any 2.0 22 20 16 Output(Figures 2 and 3) 4.5 20 17 14 6.0 CIN Maximum Input A , B, CRL 10 10 10 Capacitance 25 25 25 CX, RX Power Dissipation Capacitance (Per Multivibrator) Used to determine the no-load dynamic power consumption: PD=CPDVCC2f+ICCVCC Typical @25C,VCC=5.0 V 150 pF Unit ns ns ns pF CPD TIMING REQUIREMENTS(CL=50pF,Input tr=tf=6.0 ns) Guaranteed Limit VCC Symbol Parameter V 25 C to 85C -55C 0 0 trec Minimum Recovery 2.0 0 0 4.5 Time, Inactive to A or 0 0 6.0 B (Figure 2) 125 100 tw Minimum Pulse Width, 2.0 25 20 4.5 Input A or B (Figure 20 17 6.0 1) 125 100 tw Minimum Pulse Width, 2.0 25 20 4.5 CRL (Figure 2) 20 17 6.0 1000 1000 tr, tr Maximum Input Rise 2.0 500 500 4.5 and Fall Times, CRL 400 400 6.0 (Figure 2) A or B (Figure 2) 2.0 No Limit 4.5 6.0 125C 0 0 0 150 30 25 150 30 25 1000 500 400 Unit ns ns ns ns 4 IN74HC123 Figure 1. Switching Waveforms Figure 2. Switching Waveforms Figure 3. Test Circuit 5 IN74HC123 TIMING DIAGRAM EXPANDED LOGIC DIAGRAM 6 |
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