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DS3893A

National Semiconductor
Part Number DS3893A
Manufacturer National Semiconductor
Description BTL TURBOTRANSCEIVER
Published Mar 30, 2005
Detailed Description DS3893A BTL TURBOTRANSCEIVER March 1997 DS3893A BTL TURBOTRANSCEIVER™ General Description The TURBOTRANSCEIVER is desi...
Datasheet PDF File DS3893A PDF File

DS3893A
DS3893A

Overview
DS3893A BTL TURBOTRANSCEIVER March 1997 DS3893A BTL TURBOTRANSCEIVER™ General Description The TURBOTRANSCEIVER is designed for use in very high speed bus systems.
The bus terminal characteristics of the TURBOTRANSCEIVER are referred to as “Backplane Transceiver Logic” (BTL).
BTL is a new logic signaling standard that has been developed to enhance the performance of backplane buses.
BTL compatible transceivers feature low output capacitance drivers to minimize bus loading, a 1V nominal signal swing for reduced power consumption and receivers with precision thresholds for maximum noise immunity.
This new standard eliminates the settling time delays, that severely limit the TTL bus performance, to provide significantly higher bus transfer rates.
The TURBOTRANSCEIVER is compatible with the requirements of the proposed IEEE 896 Futurebus draft standard.
It is similar to the DS3896/97 BTL TRAPEZOIDAL™ Transceivers but the trapezoidal feature has been removed to improve the propagation delay.
A stripline backplane is therefore required to reduce the crosstalk induced by the faster rise and fall times.
This device can drive a 10Ω load with a typical propagation delay of 3.
5 ns for the driver and 5 ns for the receiver.
When multiple devices are used to drive a parallel bus, the driver enables can be tied together and used as a common control line to get on and off the bus.
The driver enable delay is designed to be the same as the driver propagation delay in order to provide maximum speed in this configuration.
The low input current on the enable pin eases the drive required for the common control line.
The bus driver is an open collector NPN with a Schottky diode in series to isolate the transistor output capacitance from the bus when the driver is in the inactive state.
The active output low voltage is typically 1V.
The bus is intended to be operated with termination resistors (selected to match the bus impedance) to 2.
1V at both ends.
Each of the resistors can be as low ...


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