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Selectable Output Driver Circuit

IP.com Disclosure Number: IPCOM000119352D
Original Publication Date: 1991-Jan-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Iwami, T: AUTHOR [+2]

Abstract

Disclosed is a circuit used for a battery backed up system. According to this circuit, the output signal lines connecting with optional devices or cards are driven by a driver which consumes a minimum driving sink/source current.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Selectable Output Driver Circuit

      Disclosed is a circuit used for a battery backed up
system. According to this circuit, the output signal lines connecting
with optional devices or cards are driven by a driver which consumes
a minimum driving sink/source current.

      The circuit in the figure consists of two sections which are,
respectively, an output driver selector 1, and some kinds of output
drivers 2.  It is assumed that each of the output drivers 2 causes a
different sink/source current capability.  For example, it is assumed
that a set of drivers consists of two drivers, one of which can drive
12 mA sink current and the other can drive CMOS 48 mA sink current.
Therefore, the penetrating current of each output driver has
different values.

      The output driver selector 1 determines which driver is to be
used to drive a certain signal by using information of installed
options.  The output driver selector 1 obtains a load value from the
information for the installed options and then chooses a driver to
consume a minimum current.

      According to this circuit, the power consumption of buffers is
reduced and the signal quality is enhanced.