Description
The DS3890 and DS3898 are designed specifically to overe problems associated with driving densely populated backplanes These products provide significant improvement in both speed and data integrity in parison to conventional bus drivers and receivers Their low output capacitance low voltage swing and noise immunity features make them ideal for driving low impedance busses with minimum power dissipation The DS3890 features an open collector outputs that generate precise trapezoidal waveforms with typical rise and fall times of 6 ns which are relatively independent of capacitive loading conditions These controlled output characteristics significantly reduce noise coupling to adjacent lines To minimize bus loading the DS3890 also features a schottky diode in series with the open collector outputs that isolates the driver output capacitance in the disabled state With this type of configuration the output low voltage is typically ‘‘1V’’ The output high level is intended to be 2 volts This is achieved by terminating the bus with a pull up resistor Both devices can drive an equivalent DC load of 18 5X (or greater) in the defined configuration (General Description to be continued).
