This part is a kind of semiconductor called BU4093BF.

Function of this product has Quad 2-input NAND Schmitt trigger.

Manufacturers : Rohm

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Datasheet General Purpose CMOS Logic IC Quad 2-Input NAND Schmitt Trigger BU4093B BU4093BF BU4093BFV General Description BU4093B, BU4093BF, BU4093BFV consist of four independent 2-input NAND gates with Schmitt-trigger function on all inputs. An inverter-based buffer is incorporated at the gate output to improve I/O transmission characteristics, and it minimizes a variation in the propagation time caused by an increase in the load capacitance. Features  Low Power Consumption  High Noise Immunity  Wide Operating Supply Voltage Range  High Input Impedance  High Fan Out  2 L-TTL Inputs or 1 LS-TTL Input can be directly driven  All Outputs are buffered Key Specifications  Operating Supply Voltage Range:  Input Voltage Range:  Operating Temperature Range: +3V to [ ... ]

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