DM8899

If MilitaryAerospace specified devices are required please contact the National Semiconductor Sales OfficeDistributors for availability and specifications

SupplyVoltage                                                       7V
InputVoltage                                                       55V
Operating Free Air Temperature Range
DM88                                                      0 to +70
StorageTemperatureRange               -65 to +150

  These DM8899 circuits are the TRI-STATE versions of the popular BCD to binary and binary to BCD converters DM74184 and DM74185A respectively They are derived from the 256-bit ROM DM8598 Emitter connections are made to provide direct read out of converted codes at outputs Y8 through Y1 as shown in the truth tables Both converters compre-hend the fact that the least significant bits (LSB) of the bina-ry and BCD codes are logically equal and in each case the LSB bypasses the converter Thus a 6-bit converter is pro-duced in each case and both devices are cascadable

  An overriding enable input is provided on each converter which when taken high inhibits the function causing all outputs to go into the high-impedance state For this rea-son and to minimize power consumption unused outputs Y7 and Y8 of the DM8899 and all "don't care"  conditions of the 184 are programmed high