分类：
2008-01-30 22:09:08
CD4051
The CD4051B is a single 8-Channel multiplexer having
three binary control inputs A, B, and C, and an inhibit
input. The three binary signals select 1 of 8 channels
to be turned on, and connect one of the 8 inputs to the output.
MAX813
The MAX705-MAX708/MAX813L microprocessor (μP) supervisory
circuits reduce the complexity and number of components
required to monitor power-supply and battery functions in
μP systems. These devices significantly improve system
reliability and accuracy compared to separate ICs or discret
components.
The MAX705/MAX706/MAX813L provide four functions:
1) A reset output during power-up, power-down, and brownout
conditions.
2) An independent watchdog output that goes low if the watchdog
input has not been toggled within 1.6 seconds.
3) A 1.25V threshold detector for power-fail warning, low-battery
detection, or for monitoring a power supply other than +5V.
4) An active-low manual-reset input.
The MAX707/MAX708 are the same as the MAX705/MAX706, except an
active-high reset is substituted for the watchdog timer.
The MAX813L is the same as the MAX705, except RESET (LOW)
is provided instead of RESET.
Two supply-voltage monitor levels are available: The
MAX705/MAX707/MAX813L generate a reset pulse when the supply
voltage drops below 4.65V, while the MAX706/MAX708 generate a reset
pulse below 4.40V.
LM4040
The LM4040 series of shunt voltage references are versatile,
easy-to-use references that cater to a vast array of applications.
The 2-pin fixed-output device requires no external resistors or
capacitors for operation and is stable with all capacitive loads.
Additionally, the reference offers low dynamic impedance, low noise,
and low temperature coefficient to ensure a stable output voltage
over a wide range of operating currents and temperatures.
The LM4040 uses fuse and Zener-zap reverse breakdown voltage
trim during wafer sort to offer four output voltage tolerances,
ranging from 0.1% (max) for the A grade to 1% (max) for the D grade.
Thus, a great deal of flexibility is offered to designers in choosing
the best cost-to-performance ratio for their applications.
