SN54F242

Supply voltage range, V_CC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 V to 7 V
Input voltage range, V_I (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 V to 7 V
Input current range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 mA to 5 mA
Voltage range applied to any output in the disabled or power-off state . . . . . . . . 0.5 V to 5.5 V
Voltage range applied to any output in the high state . . . . . . . . . . . . . . . . . . . . . . . 0.5 V to V_CC
Current into any output in the low state: SN54F242 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96 mA
                                                                 SN74F242 . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . 128 mA
Operating free-air temperature range: SN54F242 . . . . . . . . . . . . . . . . . . . . . . . . 55°C to 125°C
                                                              SN74F242 . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C
Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65°C to 150°C

† Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTE 1: The input voltage ratings may be exceeded provided the input current ratings are observed.

These quadruple bus transceivers of SN54F242 are designed for asynchronous communications between data buses. The control function implementation allows for maximum flexibility in timing. These devices allow data transmission from the A bus to the B bus or from the B bus to the A bus depending upon the logic levels at the output-enable (OEBA and OEAB) inputs. The output-enable inputs of SN54F242 can be used to disable the device so that the buses are effectively isolated.

The dual-enable configuration gives the quadruple bus transceivers the capability to store data by simultaneous enabling of OEBA and OEAB. Each output reinforces its input in this transceiver configuration. Thus, when both control inputs of SN54F242 are enabled and all other data sources to the two sets of bus lines are at high impedance, both sets of bus lines (eight in all) remain at their states. The 4-bit codes appearing on the two sets of buses will be complementary for the 4F242.

The SN54F242 is characterized for operation over the full military temperature range of 55°C to 125°C. The SN74F242 is characterized for operation from 0°C to 70°C.