LP3470

Tiny SOT23-5 Package
Open DrainReset Output
Programmable Reset Timeout Period Using an External Capacitor
Immune to Short V_CC Transients

Critical µP and µC Power Monitoring
Intelligent Instruments
Computers
Portable/Battery-Powered Equipments

(Note 1)
V_CC Voltage .............................................................. −0.3V to +6V
Reset Voltage ............................................................−0.3V to +6V
Output Current (Reset) .........................................................10 mA
Operating Temperature Range
LP3470 ..................................................................−20°C to +85°C
LP3470I .................................................................−40°C to +85°C
Junction Temperature (T_Jmax) ...............................................125°C
Power Dissipation (T_A = 25°C) (Note2) ..............................300 mW
_JA (Note 2) ......................................................................280°C/W
Storage Temp. Range ..........................................−65°C to +150°C
Lead Temp. (Soldering, 5 sec) ...............................................260°C
ESD Rating (Note 3) .................................................................2 kV

The LP3470 is a micropower CMOS voltage supervisory circuit designed to monitor power supplies in microprocessor (µP) and other digital systems. It provides maximum adjustability for power-on-reset (POR) and supervisory functions. It is available in the following six standard reset threshold voltage (V_RTH) options: 2.63V, 2.93V, 3.08V, 3.65V, 4.00V, 4.38V, and 4.63V. If other voltage options between 2.4V and 5.0V are desired please contact your National Semiconductor representative.

The LP3470 asserts a reset signal whenever the V_CC supply voltage falls below a reset threshold. The reset time-out period is adjustable using an external capacitor. Reset remains asserted for an interval (programmed by an external capacitor) after V_CC has risen above the threshold voltage.

The device is available in the tiny SOT23-5 package.

Reliability Metrics

Application Notes