These quad differential drivers are TTL input
to pseudo-ECL differential output used for digital data transmission over
balanced transmission lines.
The TB5D1M device is a pin and functional replacement for
the Agere systems BDG1A and BPNGA quad differential drivers. The TB5D1M has a
built-in lightning protection circuit to absorb large transitions on the
transmission lines without destroying the device. When the circuit is powered
down it loads the transmission line, because of the protection circuit.
The TB5D2H device is a pin and functional replacement for
the Agere systems BDG1A and BDGLA quad differential drivers. Upon power down
the TB5D2H output circuit appears as an open circuit and does not load the
Both drivers feature a 3-state output with a third-state
level of less than 0.1 V.
The packaging options available for these quad differential
line drivers include a 16-pin SOIC gull-wing (DW) and a 16-pin SOIC (D)
Both drivers are characterized for operation from -40°C to
The logic inputs of this device include internal pull-up
resistors of approximately 40 k that are connected to VCC to ensure a logical high level input if the inputs
are open circuited.