SN74F251B

• 3-State Versions of SN54F151B and SN74F151B
• 3-State Outputs Interface Directly With System Bus
• Performs Parallel-to-Serial Conversion
• Complementary Outputs Provide True and Inverted Data
• Package Options Include Plastic Small-Outline Packages, Ceramic Chip Carriers, and Standard Plastic and Ceramic 300-mil DIPs

Supply voltage range, V_CC . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . 0.5 V to 7 V
Input voltage range (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: SN54F251B . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 mA
                                                                 SN74F251B . . . . . . . . . . . . . . . . . . . . . .  . . . . . 48 mA
Operating free-air temperature range: SN54F251B . . . . . . . . . . . . . . . . . . . . 55°C to 125°C
                                                             SN74F251B . . . . . . . . . . . . . . .. . . . . . . . . 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 data selectors/multiplexers of the SN74F251B contain full binary decoding to select one of eight data sources and feature strobe-controlled complementary outputs. The 3-state outputs can interface with and drive data lines of busorganized systems. When the strobe (G) input is high, both outputs are in a high-impedance state in which both the upper and lower transistors of each totem-pole output are off, and the output neither drives nor loads the bus significantly.

The SN54F251B is characterized for operation over the full military temperature range of 55°C to 125°C. The SN74F251B is characterized for operation from 0°C to 70°C.