4099B

      The 4099B 8-bit addressable latch is designed to be a serial-input,parallel-output storage register that can perform a variety of functions.Also data are inputted to a paticular bit in the latch 4099B when that bit is addressed(by means of inputs A0,A1,A2) and when WRITE DISABLE is at a low leavel.When WRITE DISABLE is high,data entry is inhibited;however,all 8 outputs can be continuously read independent of WRITE DISABLE and address inputs. The 4099B also  avaliable for a master RESET input,which resets all bits to a logic "0" level when RESET and WRITE DISABLE are at a high level.When RESET is at a high level,the 4099B latch acts as a 1-of-8 demultiplexer;the bit that is addressed has an active output which follows the data input,while all unaddressed bits bits are held to a logic "0" level.
      The 4099B has five features.The first one os that it would have serial data input.The second one is that the 4099B would have active parallel output.The third one is that it would have storage register capability.The fourth one is that it would be master clear.The last one is that the 4099B could function as demultiplexer.That are all the features.It also have two applications.The first one is that it could be used in multi-line decoders.The second one is that it could also be used in A/D converters.
      Some important electrical static characteristics of the 4099B have been concluded into several points as follow.It is about its quiescent device current.When Vdd is 5V, the 4099B would have the max. of 5 uA at T(LOW) and would have the typ. of 0.02 uA and the max. of 5 uA at +25°C and would have the max. of 150 uA at T(HIGH).When Vdd is 10V,it would have the max. of 10 uA at T(LOW) and would have the typ. of 0.02 uA and the max. of 10 uA at +25°C and would have the max. of 300 uA at T(HIGH).When Vdd is 15V, the 4099B would have the max. of 20 uA at T(LOW) and would have the typ. of 0.02 uA and the max. of 20 uA at +25°C and would have the max. of 600 uA at T(HIGH).