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| SL74HCT244 Octal 3-State Noninverting Buffer/Line Driver/Line Receiver High-Performance Silicon-Gate CMOS The SL74HCT244 is identical in pinout to the LS/ALS244. The device may be used as a level converter for interfacing TTL or NMOS outputs to High-Speed CMOS inputs. The SL74HCT244 is an octal noninverting buffer/line driver/line receiver designed to be used with 3-state memory address drivers, clock drivers, and other bus-oriented systems. The device has non-inverted 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 SL74HCT244N Plastic SL74HCT244D SOIC TA = -55 to 125 C for all packages PIN ASSIGNMENT LOGIC DIAGRAM FUNCTION TABLE Inputs Enable A, Enable B PIN 20=VCC PIN 10 = GND L L H X=don't care Z = high impedance A,B L H X Outputs YA,YB L H Z SLS System Logic Semiconductor SL74HCT244 MAXIMUM RATINGS * Symbol VCC VIN VOUT IIN IOUT ICC PD Tstg TL * Parameter DC Supply Voltage (Referenced to GND) DC Input Voltage (Referenced to GND) DC Output Voltage (Referenced to GND) DC Input Current, per Pin DC Output Current, per Pin DC Supply Current, VCC and GND Pins Power Dissipation in Still Air, Plastic DIP+ SOIC Package+ Storage Temperature Lead Temperature, 1 mm from Case for 10 Seconds (Plastic DIP or SOIC Package) Value -0.5 to +7.0 -1.5 to VCC +1.5 -0.5 to VCC +0.5 20 35 75 750 500 -65 to +150 260 Unit V V V mA mA mA mW C C 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 VCC VIN, VOUT TA tr, t f Parameter DC Supply Voltage (Referenced to GND) DC Input Voltage, Output Voltage (Referenced to GND) Operating Temperature, All Package Types 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. SLS System Logic Semiconductor SL74HCT244 DC ELECTRICAL CHARACTERISTICS(Voltages Referenced to GND) VCC Symbol VIH VIL VOH Parameter Minimum High-Level Input Voltage Maximum Low -Level Input Voltage Minimum High-Level Output Voltage Test Conditions VOUT= VCC-0.1 V IOUT 20 A VOUT=0.1 V IOUT 20 A VIN=VIH IOUT 20 A VIN=VIH IOUT 6.0 mA VOL Maximum Low-Level Output Voltage VIN= VIL IOUT 20 A VIN= VIL IOUT 6.0 mA IIN IOZ Maximum Input Leakage Current Maximum Three-State Leakage Current VIN=VCC or GND Output in HighImpedance State VIN= VIL or VIH VOUT=VCC or GND VIN=VCC or GND IOUT=0A VIN=2.4 V, Any One Input VIN=VCC or GND, Other Inputs IOUT=0A NOTE: Total Supply Current = ICC + ICC. 5.5 4.5 5.5 5.5 0.26 0.1 0.5 0.33 1.0 5.0 0.4 1.0 10.0 A A V 4.5 5.5 4.5 5.5 4.5 5.5 4.5 4.5 5.5 Guaranteed Limit 25 C to -55C 2.0 2.0 0.8 0.8 4.4 5.4 3.98 0.1 0.1 85 C 2.0 2.0 0.8 0.8 4.4 5.4 3.84 0.1 0.1 125 C 2.0 2.0 0.8 0.8 4.4 5.4 3.7 0.1 0.1 V Unit V V V ICC Maximum Quiescent Supply Current per Package) Additional Quiescent Supply Current 5.5 4.0 40 160 A ICC -55C 25C to 125C 2.4 mA 2.9 SLS System Logic Semiconductor SL74HCT244 AC ELECTRICAL CHARACTERISTICS(VCC =5.0 V 10%, CL=50pF,Input t r=t f=6.0 ns) Guaranteed Limit Symbol tPLH, t PHL tPLZ, t PHZ tPZL, t PZH tTLH, t THL CIN COUT Parameter Maximum Propagation Delay, A to YA or B to YB (Figures 1 and 3) Maximum Propagation Delay , Output Enable to YA or YB (Figures 2 and 4) Maximum Propagation Delay , Output Enable to YA or YB (Figures 2 and 4) Maximum Output Transition Time, Any Output (Figures 1 and 3) Maximum Input Capacitance Maximum Three-State Output Capacitance (Output in High-Impedance State) Power Dissipation Capacitance (Per Enabled Output) CPD Used to determine the no-load dynamic power consumption: PD=CPDVCC2f+ICCVCC 25 C to -55C 20 26 22 12 10 15 85C 25 33 28 15 10 15 125C 30 39 33 18 10 15 Unit ns ns ns ns pF pF Typical @25C,VCC=5.0 V 55 pF Figure 1. Switching Waveforms Figure 2. Switching Waveforms Figure 3. Test Circuit Figure 4. Test Circuit SLS System Logic Semiconductor SL74HCT244 EXPANDED LOGIC DIAGRAM (1/8 of the Device) SLS System Logic Semiconductor |
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