Output buffers which operate at high speeds require delicate handling of
the noise on the supply lines. This necessitates control be exercised
over current slew rate not only on the rising edge of current but also on
the falling edge of the current. A circuit provides control over the
current slew rate on the falling edge in high speed output driver
charging/discharging heavy load without affecting the speed of the driver
(which otherwise would have created supply/ground bounce due to
parasitics present in the bonding wires, package pins and on-chip metal
interconnects in the I/O ring). The control circuit further suppresses
the supply/ground noise by a very significant level while incurring small
penalty in terms of silicon area and power dissipation. This circuit
includes a CMOS circuit that is cross-coupled input connected to the
output buffer input signals with a dummy capacitance coupled to the CMOS
circuit output.