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| SL74LS244 Octal 3-State Noninverting Buffer/Line Driver/Line Receiver These octal buffers and line drivers and designed specifically to improve both the performance and density of three-state memory address drivers, clock drivers, and busoriented receivers and transmitters. This devise features high fan-out, improved fan-in, and 400 mV noise margin. It can be used to drive terminated lines down to 133 ohms. * 3-State Outputs Drive Bus Lines or Buffer Memory Address Registers * P-N-P Inputs Reduce D-C Loading * Hysteresis at Inputs Improves Noise Margins ORDERING INFORMATION SL74LS244N Plastic SL74LS244D SOIC TA = 0 to 70 C for all packages PIN ASSIGNMENT LOGIC DIAGRAM FUNCTION TABLE Inputs PIN 20=VCC PIN 10 = GND Enable A, Enable B 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 SL74LS244 MAXIMUM RATINGS * Symbol VCC VIN VOUT Tstg * Parameter Supply Voltage Input Voltage Output Voltage Storage Temperature Range Value 7.0 7.0 5.5 -65 to +150 Unit V V V C Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the Recommended Operating Conditions. RECOMMENDED OPERATING CONDITIONS Symbol VCC VIH VIL IOH IOL TA Supply Voltage High Level Input Voltage Low Level Input Voltage High Level Output Current Low Level Output Current Ambient Temperature Range 0 Parameter Min 4.75 2.0 0.8 -15 24 +70 Max 5.25 Unit V V V mA mA C DC ELECTRICAL CHARACTERISTICS over full operating conditions Guaranteed Limit Symbol VIK VOH Parameter Input Clamp Voltage High Level Output Voltage Test Conditions VCC = min, IIN = -18 mA VCC = min, IOH = -1.0 mA VCC = min, IOH = -3.0 mA VCC = min, IOH = -15 mA VOL Low Level Output Voltage VCC = min, IOL = 12 mA VCC = min, IOL = 24 mA VT+ - VTIOZH IOZL IIH Hysteresis Output Off Current HIGH Output Off Current LOW High Level Input Current VCC = min VCC = max, VOUT = 2.7 V VCC = max, VOUT = 0.4 V VCC = max, VIN = 2.7 V VCC = max, VIN = 7.0 V IIL IO ICC Low Level Input Current Output Short Circuit Current Supply Current Outputs High Outputs Low All outputs disabled VCC = max, VIN = 0.4 V VCC = max, VO =0 V (Note 1) VCC = max Outputs open -40 0.2 20 -20 20 0.1 -0.2 -225 27 46 54 2.7 2.4 2.0 0.4 0.5 V A A A mA mA mA mA V Min Max -1.5 Unit V V SLS System Logic Semiconductor SL74LS244 note 1: Not more than one output should be shorted at a time, and duration of the short-circuit should not exceed one second AC ELECTRICAL CHARACTERISTICS (TA = 25C, VCC = 5.0 V, tr = 15 ns, tf = 6.0 ns) Symbol tPLH tPHL tPZH tPZL tPHZ tPLZ Parameter Propagation Delay, Data to Output Propagation Delay, Data to Output Output Enable Time Output Enable Time Output Disable Time Output Disable Time CL = 5 pF RL = 667 CL = 45 pF, RL = 667 Test Condition Min Max 18 18 23 30 18 25 Unit ns ns ns ns ns ns tPZL - S1 closed, S2 opened tPZH- S1 opened, S2 closed tPLZ, t PHZ - S1 and S2 closed Figure 1. Switching Waveforms (See Figure 3) Figure 2. Switching Waveforms (See Figure 4) NOTES A. CL includes probe and jig capacitance. B. All diodes are 1N916 or 1N3064. Figure 3. Test Circuit NOTES A. CL includes probe and jig capacitance. B. All diodes are 1N916 or 1N3064. Figure 4. Test Circuit SLS System Logic Semiconductor SL74LS244 EXPANDED LOGIC DIAGRAM SLS System Logic Semiconductor |
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