August 2000
PRELIMINARY
ML6516244*
16-Bit Buffer/Line Driver with 3-State Outputs
GENERAL DESCRIPTION
The ML6516244 is a BiCMOS, 16-bit buffer/line driver
with 3-state outputs. This device was specifically designed
for high speed bus applications. Its 16 channels support
propagation delay of 2.5ns maximum, and fast output
enable and disable times of 7.0ns or less to minimize
datapath delay.
This device is designed to minimize undershoot,
overshoot, and ground bounce to decrease noise delays.
These transceivers implement a unique digital and analog
implementation to eliminate the delays and noise inherent
in traditional digital designs. The device offers a new
method for quickly charging up a bus load capacitor to
minimize bus settling times, or FastBus™ Charge. FastBus
Charge is a transition current, (specified as I
DYNAMIC
) that
injects between 60 to 200mA (depending on output load)
of current during the rise time and fall time. This current is
used to reduce the amount of time it takes to charge up a
heavily-capacitive loaded bus, effectively reducing the
bus settling times, and improving data/clock margins in
tight timing budgets.
Micro Linear’s solution is intended for applications for
critical bus timing designs that include minimizing device
propagation delay, bus settling time, and time delays due
to noise. Applications include; high speed memory arrays,
bus or backplane isolation, bus to bus bridging, and sub-
2.5ns propagation delay schemes.
The ML6516244 follows the pinout and functionality of
the industry standard 3.3V-logic families.
FEATURES
s
Low propagation delays — 2.5ns maximum for 3.3V
2.25ns maximum for 5.0V
Fast output enable/disable times of 5.0ns maximum
FastBus Charge current to minimize the bus settling
time during active capacitive loading
3.0 to 3.6V and 4.5 to 5.5V V
CC
supply operation;
LV-TTL compatible input and output levels with 3-state
capability
Industry standard pinout compatible to FCT, ALV, LCX,
LVT, and other low voltage logic families
ESD protection exceeds 2000V
Full output swing for increased noise margin
Undershoot and overshoot protection to 400mV
typically
Low ground bounce design
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* This part is End of Life as of August 1, 2000.
BLOCK DIAGRAM
V
CC
OE
A0
B0
B1
B2
B3
A1
A2
A3
GND
1 of 4
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MICRO-LINEAR [ MICRO LINEAR CORPORATION ]
