SN74LS251

      The TTL/MSI SN74LS251 is a kind of high speed 8-Input Digital Multiplexer. It provides, in one package, the ability to select one bit of data from up to eight sources. The LS251 can be used as a universal function generator to generate any logic function of four variables.
      Here you can get some information about the features.First is schottky process for high speed.The second one is multifunction capability.The third one is on-chip select logic decoding.Then is inverting and non-inverting 3-state outputs.The last one is input clamp diodes limit high speed termination effects.
      What comes next is about the guaranteed operating ranges SN74LS251.The minimum V_CC (Supply Voltage) is 4.75 V,the typical is 5.0 V and the maximum is 5.25 V.The minimum T_A (Operating Ambient Temperature) is 0,the typical is 25 and the maximum is 70.The maximum I_OH (Output CurrentHigh) is 2.6 mA.The maximum I_OL (Output CurrentLow) is 24 mA.
      There are the DC characteristics over operating temperature range SN74LS251 to follow.The minimum V_IH (Input HIGH Voltage) is 2.0 V when guaranteed input HIGH voltage for all inputs.The maximum V_IL (Input LOW Voltage) is 0.8 V when guaranteed input LOW voltage for all inputs. The typical V_IK (Input Clamp Diode Voltage) is 0.65 V and the maximum is 1.5 V at V_CC = MIN, I_IN = 18 mA.The minimum V_OH (Output HIGH Voltage) is 2.4 V and the maximum is 3.1 V at V_CC = MIN, I_OH = MAX, V_IN = V_IH or V_IL per Truth Table.The typical V_OL (Output LOW Voltage) is 0.25 V and the maximum is 0.4 V at I_OL = 12 mA,V_CC = V_CC MIN,V_IN = V_IL or V_IH per Truth Table.The typical V_OL (Output LOW Voltage) is 0.35 V and the maximum is 0.5 V at I_OL = 24 mA,V_CC = V_CC MIN,V_IN = V_IL or V_IH per Truth Table.The maximum I_OZH (Output Off Current HIGH) is 20 A at V_CC = MAX, V_OUT = 2.7 V.The maximum I_OZL (Output Off Current LOW) is 20 A at V_CC = MAX, V_OUT = 0.4 V.The maximum I_IH (Input HIGH Current) is 20 A at V_CC = MAX, V_IN = 2.7 V and is 0.1 mA at V_CC = MAX, V_IN = 7.0 V.The maximum I_IL (Input LOW Current) is 0.4 mA at V_CC = MAX, V_IN = 0.4 V.The minimum I_OS (Short Circuit Current) is 30 mA and the maximum is 130 mA at V_CC = MAX.