DS3890 Datasheet, PDF (1/8 Pages) National Semiconductor (TI) – Octal Trapezoidal Driver / Octal TRI-STATE Receiver

January 1996
DS3890 BTL Octal Trapezoidal Driver
DS3892 BTL Octal TRI-STATE Receiver
General Description
The DS3890 and DS3898 are designed specifically to over-
come problems associated with driving densely populated
backplanes These products provide significant improve-
ment in both speed and data integrity in comparison to con-
ventional bus drivers and receivers Their low output capaci-
tance 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 gener-
ate 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 typi-
cally ‘‘1V’’ The output high level is intended to be 2 volts
Logic and Connection Diagrams
DS3890 Octal Trapezoidal Driver
This is achieved by terminating the bus with a pull up resis-
tor Both devices can drive an equivalent DC load of 18 5X
(or greater) in the defined configuration
(General Description to be continued)
Features
Y _{Driver output capacitance less than 5 pF}
Y _{1 volt bus signal reduces power consumption}
Y _{Trapezoidal driver waveforms (tr tf typically 6 ns) re-}
duces noise coupling to adjacent lines
Y _{Precise receiver threshold track the bus logic high level}
to maximize noise immunity in both logic high ahd low
states
Y _{Open collector driver output allows wire-or connection}
Y _{Advanced low power schottky technology}
Y _{Glitch free power up down protection}
Y _{TTL compatible driver and control inputs and receiver}
output
Y _{BTL compatible}
DS3892 Octal TRI-STATE Receiver
TL F 8700 – 1
Order Numbers DS3892M DS3890N or DS3892N
See NS Package Number M20B or N20A
TL F 8700 – 2
TRI-STATE is a registered trademark of National Semiconductor Corporation
C1996 National Semiconductor Corporation TL F 8700
RRD-B30M36 Printed in U S A
http www national com