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| IN74HCT240A OCTAL 3-STATE INVERTING BUFFER/LINE DRIVER/LINE RECEIVER High-Performance Silicon-Gate CMOS The IN74HCT240A is identical in pinout to the LS/ALS240. The IN74HCT240A may be used as a level converter for interfacing TTL or NMOS outputs to High Speed CMOS inputs. This octal inverting buffer/line driver/line receiver is designed to be used with 3-state memory address drivers, clock drivers, and other bus-oriented systems. The device has inverting outputs and two active-low output enables. * TTL/NMOS Compatible Input Levels * Outputs Directly Interface to CMOS, NMOS, and TTL * Operating Voltage Range: 4.5 to 5.5 V * Low Input Current: 1.0 A ORDERING INFORMATION IN74HCT240AN Plastic IN74HCT240ADW SOIC TA = -55 to 125 C for all packages PIN ASSIGNMENT LOGIC DIAGRAM FUNCTION TABLE Inputs Enable A, A,B Enable B L L L H H X Outputs YA,YB H L Z PIN 20=VCC PIN 10 = GND X = don't care Z = high impedance 1 IN74HCT240A 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 35 ICC DC Supply Current, VCC and GND Pins mA 75 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 (Figure 1) Min 4.5 0 -55 0 Max 5.5 VCC +125 500 Unit V V C ns 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 IN74HCT240A DC ELECTRICAL CHARACTERISTICS(Voltages Referenced to GND) Guaranteed Limit VCC Symbol Parameter Test Conditions V 125 25 C 85 to C C -55C VIH Minimum High- VOUT=0.1 V 4.5 2.0 2.0 2.0 Level Input IOUT 20 A 5.5 2.0 2.0 2.0 Voltage VIL Maximum Low - VOUT= VCC-0.1 V 4.5 0.8 0.8 0.8 Level Input IOUT 20 A 5.5 0.8 0.8 0.8 Voltage VOH Minimum High- VIN= VIL 4.5 4.4 4.4 4.4 Level Output IOUT 20 A 5.5 5.4 5.4 5.4 Voltage VIN=VIL 4.5 3.98 3.84 3.7 IOUT 6.0 mA VOL Maximum Low- VIN=VIH 4.5 0.1 0.1 0.1 Level Output IOUT 20 A 5.5 0.1 0.1 0.1 Voltage VIN= VIH 4.5 0.26 0.33 0.4 IOUT 6.0 mA IIN Maximum Input VIN=VCC or GND 5.5 0.1 1.0 1.0 Leakage Current in High- 5.5 IOZ Maximum three Output 0.5 5.0 10.0 State State Leakage Impedance VIN Current = VIL or VIH VOUT=VCC or GND VIN=VCC ICC Maximum or GND 5.5 4.0 40 160 Quiescent Supply IOUT=0A Current (per Package) VIN = 2.4 V, Any One Additional 25C to 125C ICC Quiescent Supply Input -55C VIN=VCC or GND, Other Current Inputs 5.5 2.9 2.4 IOUT=0A NOTE: Total Supply Current = ICC + ICC Unit V V V V A A A mA 3 IN74HCT240A AC ELECTRICAL CHARACTERISTICS(VCC=5.0 V 10%, CL=50pF,Input tr=tf=6.0 ns) Guaranteed Limit Unit Symbol Parameter 25 C 85C 125 to C -55C tPLH, Maximum Propagation Delay, A to YA or 20 25 30 ns tPHL B to YB (Figures 1 and 3) tPLZ, Maximum Propagation Delay, Output 28 35 42 ns tPHZ Enable to YA or YB (Figures 2 and 4) tPZH, Maximum Propagation Delay, Output 25 31 38 ns tPZL Enable to YA or YB (Figures 2 and 4) 12 15 18 ns tTLH, tTHL Maximum Output Transition Time, Any Output (Figures 1 and 3) CIN Maximum Input Capacitance 10 10 10 pF 15 15 15 pF COUT Maximum Three-State Output Capacitance (Output in High-Impedance State) Power Dissipation Capacitance (Per Enable Output) Used to determine the no-load dynamic power consumption: PD=CPDVCC2f+ICCVCC Typical @25C,VCC=5.0 V 55 CPD pF Figure 1. Switching Waveforms Figure 2. Switching Waveforms 4 IN74HCT240A Figure 3. Test Circuit Figure 4. Test Circuit EXPANDED LOGIC DIAGRAM (1/8 of the Device) 5 |
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