National Semiconductor Introduces Three New Supervisory Circuits
National Semiconductor Corp. (Santa Clara, CA) has introduced three new voltage supervisory circuits in its LM37xx family with factory-programmability. The devices are suitable for use in space-constrained portable and battery-powered applications such as PDAs, cellular phones and information appliances. The circuits are available in both the extended temperature range (from -40 to 125 degrees C) and in the industrial temperature range (from -40 to 85 degrees C).
The new ICs have a supply current of 6µA and a reset-output valid down to 1V. The reset signal is asserted whenever the voltage supply drops below the predetermined set point, and remains active for 100ms after the supply voltage rises above the threshold voltage. The LM3772 has totem-pole output with active-low reset output, while the LM3723 has a totem-pole output with active-high reset. The LM3724 has an open-drain with active-low reset bar output. The standard voltages for these circuits are 4.63V, 3.08V and 2.32V. Additional threshold voltages between 2.2V and 5.0V, in steps of 10mV, are also available.
"The three new devices meet market requirements for low power and small footprint, offering our customers complete supervisory IC solutions in their portable designs," said Maria Laughlin, marketing manager of National Semiconductor's power management group.
The three new circuits are available now in the industrial temperature range, in SOT23-5 packaging. They are priced at $0.80 each in quantities of 1,000 units.
