DS3890 Datasheet | National Semiconductor

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) Features Driver output capacitance less than 5 p F 1 volt bus signal reduces power consumption Trapezoidal driver waveforms (tr tf typically 6 ns) reduces noise coupling to adjacent lines Precise receiver threshold track the bus logic high level to maximize noise immunity in both logic high ahd low states Open collector driver output allows wire-or connection Advanced low power schottky technology Glitch free power up down protection TTL patible driver and control inputs and receiver output BTL patible Logic and Connection Diagrams DS3890 Octal Trapezoidal Driver DS3892 Octal TRI-STATE Receiver TL F 8700 - 1 TL F 8700 - 2 Order Numbers DS3892M DS3890N or DS3892N See NS Package Number M20B or N20A TRI-STATE is a registered trademark of National Semiconductor...