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| IN74HCT14A HEX SCHMITT-TRIGGER INVERTER High-Performance Silicon-Gate CMOS The IN74HCT14A may be used as a level converter for interfacing TTL or NMOS outputs to high-speed CMOS inputs. The IN74HCT14A is identical in pinout to the LS/ALS14. The IN74HCT14A is useful to "square up" slow input rise and fall times. Due to the hysteresis voltage of the Schmitt trigger, the IN74HCT14A finds applications in noisy environments. TTL/NMOS-Compatible Input Levels. Outputs Directly Inferface to CMOS, NMOS and TTL. Operating Voltage Range: 4.5 to 5.5 V Low Input Current: 1.0 A * * * * ORDERING INFORMATION IN74HCT14AN Plastic IN74HCT14AD SOIC TA = -55 to 125 C for all packages LOGIC DIAGRAM PIN ASSIGNMENT FUNCTION TABLE Inputs Output A Y L H H L PIN 14 =VCC PIN 7 = GND 1 IN74HCT14A 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 mA 20 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 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 (Figure 1) * Min 4.5 0 -55 0 Max 5.5 VCC +125 No Limit* Unit V V C ns When VIN 50% VCC ,ICC>1.0 mA. 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 IN74HCT14A DC ELECTRICAL CHARACTERISTICS(Voltages Referenced to GND) Guaranteed Limit VCC Symbol Parameter Test Conditions V 25 85 125 C to C C 55C VT+max Maximum Positive- VOUT=0.1 V 4.5 1.9 1.9 1.9 Going Input IOUT 20 A 5.5 2.1 2.1 2.1 Threshold Voltage VT+min Minimum Positive- VOUT=0.1 V 4.5 1.2 1.2 1.2 Going Input IOUT 20 A 5.5 1.4 1.4 1.4 Threshold Voltage VOUT=VCC VT-max Maximum -0.1 V 4.5 1.2 1.2 1.2 Negative-Going 5.5 1.4 1.4 1.4 IOUT 20 A Input Threshold Voltage VT-min Minimum Negative- VOUT=VCC-0.1 V 4.5 0.5 0.5 0.5 Going Input IOUT 20 A 5.5 0.6 0.6 0.6 Threshold Voltage 1.4 1.4 1.4 VHmax Maximum VOUT=0.1 V or VCC- 4.5 5.5 1.5 1.5 1.5 Note 1 Hysteresis Voltage 0.1V IOUT 20 A 0.4 0.4 0.4 VHmin Minimum VOUT=0.1 V or VCC- 4.5 5.5 0.4 0.4 0.4 Note 1 Hysteresis Voltage 0.1V IOUT 20 A 4.4 4.4 4.4 VOH Minimum High- VINVT -min 4.5 5.5 5.4 5.4 5.4 Level Output IOUT 20 A Voltage VINVT -min 4.5 3.98 3.84 3.7 IOUT4mA VOL Maximum Low- VINVT 0.1 0.1 0.1 +max 4.5 Level Output IOUT 20 A 5.5 0.1 0.1 0.1 Voltage VINVT +max 4.5 0.26 0.33 0.4 IOUT 4mA IIN Maximum Input VIN=VCC or GND 5.5 0.1 1.0 1.0 Leakage Current VIN=VCC ICC Maximum or GND 5.5 1.0 10 40 Quiescent Supply IOUT=0A Current (per Package) VIN=2.4 V, Any One Additional -55 C 25C to ICC Quiescent Supply Input 125 C Current 2.9 2.4 VIN=VCC or GND, 5.5 Other Inputs IOUT=0 A Note: 1 VHmin>(VT+min)-(VT-max); VHmax=(VT+max)-(VT-min) Unit V V V V V V V V A A mA 3 IN74HCT14A AC ELECTRICAL CHARACTERISTICS(VCC=5.0 V 10%, CL=50pF,Input tr=tf=6.0 ns) Temperature Limits Symbol Parameter Unit 25 C to 85C 125C -55C 32 40 48 ns tPLH, Maximum Propagation Delay, tPHL Input A or B to Output Y (L to H) (Figures 1 and 2) 15 19 22 ns tTLH, tTHL Maximum Output Transition Time, Any Output (Figures 1 and 2) CIN Maximum Input Capacitance 10 10 10 pF Power Dissipation Capacitance (Per Inverter) Used to determine the no-load dynamic power consumption: PD=CPDVCC2f+ICCVCC Typical @25C,VCC=5.0 V 32 pF CPD Figure 1. Switching Waveforms Figure 2. Test Circuit 4 |
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