SL74LS244 SLS

Document overview

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Technical content

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 FUNCTION TABLE Inputs Outputs Enable A, Enable B A,B YA,YB L L L L H H H X Z X=don’t care Z = high impedance LOGIC DIAGRAM PIN 20=VCC PIN 10 = GND PIN ASSIGNMENT

MAXIMUM RATINGS* Symbol Parameter Value Unit VCC Supply Voltage 7.0 V VIN Input Voltage 7.0 V VOUT Output Voltage 5.5 V Tstg Storage Temperature Range -65 to +150 °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 Parameter Min Max Unit VCC Supply Voltage 4.75 5.25 V VIH High Level Input Voltage 2.0 V VIL Low Level Input Voltage 0.8 V IOH High Level Output Current -15 mA IOL Low Level Output Current 24 mA TA Ambient Temperature Range 0 +70 °C DC ELECTRICAL CHARACTERISTICS over full operating conditions Guaranteed Limit Symbol Parameter Test Conditions Min Max Unit VIK Input Clamp Voltage VCC = min, IIN = -18 mA -1.5 V VOH High Level Output Voltage VCC = min, IOH = -1.0 mA 2.7 V VCC = min, IOH = -3.0 mA 2.4 VCC = min, IOH = -15 mA 2.0 VOL Low Level Output Voltage VCC = min, IOL = 12 mA 0.4 V VCC = min, IOL = 24 mA 0.5 VT+ - VT- Hysteresis VCC = min 0.2 V IOZH Output Off Current HIGH VCC = max, VOUT = 2.7 V 20 µA IOZL Output Off Current LOW VCC = max, VOUT = 0.4 V -20 µA IIH High Level Input Current VCC = max, VIN = 2.7 V 20 µA VCC = max, VIN = 7.0 V 0.1 mA IIL Low Level Input Current VCC = max, VIN = 0.4 V -0.2 mA IO Output Short Circuit Current VCC = max, VO =0 V (Note 1) -40 -225 mA ICC Supply Outputs High VCC = max 27 mA Current Outputs Low Outputs o pen 46 All outputs disabled