National Semiconductor’s New Power-On-Reset (POR) Voltage Supervisory IC Offers Highest Precision Available in a SOT23 Package

October 28, 1997 - National Semiconductor Corporation® today announced a power-on-reset (POR) voltage monitor with guaranteed accuracy of 1% over the entire temperature range of -20C to +85C and with guaranteed reset valid down to Vcc=0.5V. The micropower LP3470 voltage monitor, housed in a tiny SOT23-5 package, is designed to generate a reset output whenever the supply voltage falls below preset specifications. Maximum flexibility for power-on-reset (POR) and supervisory functions is provided with an adjustable reset time-out period.

The LP3470 is available in six standard reset threshold voltages: 2.63V, 2.93V, 3.08V, 4.00V, 4.38V and 4.63V. In addition, National’s E2 PROM technology enables the LP3470 to be programmed to more than 50 different reset threshold voltages between 2.4V and 5.0V in 50mV increments.

“Our E2PROM technology allows customers to select the precise reset threshold voltage they need for their specific application,” said Mark Downing, National’s director of power management products. “E2PROM also improves their time-to-market by allowing us to program each customer’s threshold voltage just before the LP3470 is delivered.”

Other key features of the LP3470 include immunity to short voltage transients. A low quiescent current of 16 microamps (typ) makes the device an ideal choice to monitor battery-powered systems. It is especially suitable for monitoring lithium-ion battery voltages thanks to the low quiescent current combined with +/-1% threshold voltage accuracy.

The LP3470 voltage monitor is designed to prevent fault conditions that typically occur during power-up, power-down and brownout conditions. Typical applications include intelligent instruments, computers and portable battery-powered equipment.

Price and Availability
Available now in production quantities, the LP3470M5 in the SOT23-5 package is priced at $0.70 each in 1000-unit lots.

For more information on the LP3470, please visit our World Wide Web site at http://www.national.com/pf/LP/LP3470.html.

National Semiconductor Corporation, a Fortune 500 company, produces system on a chip silicon solutions for the information highway, based on its leadership in analog and mixed signal technologies. National is headquartered in Santa Clara, California, and focuses on the communications, personal systems and consumer markets. National has annual sales of approximately $2.5 billion and 12,700 employees worldwide. Additional company and product information is available on the World Wide Web at www.national.com.