4-Pin Smart Reset Device 6-Pin UDFN T/R

The Smart ResetTMdevices provide a useful feature which ensures that inadvertent short reset push-button closures do not cause system resets. This is done by implementing an extended Smart Reset input delay time (tSRC), which ensures a safe reset and eliminates the need for a specific dedicated reset button.This reset configuration provides versatility and allows the application to distinguish between a software generated interrupt and a hard system reset. When the input push-button is connected to the microcontroller interrupt input, and is closed for a short time, the processor can only be interrupted. If the system still does not respond properly, continuing to keep the push-button closed for the extended setup time tSRCcauses a hard reset of the processor through the reset output.The SR1 has one Smart Reset input (SR) with preset delayed Smart Reset setup time (tSRC). The reset output (RST) is asserted after the Smart Reset input is held active for the selected tSRCdelay time. The RSToutput remains asserted either until the SRinput goes to inactive logic level (i.e. neither fixed nor minimum reset pulse width is set) or the output reset pulse duration is fixed for tREC(i.e. factory-programmed). The device fully operates over a broad VCCrange from 2.0 V to 5.5 V.

Operating voltage range 2 V to 5.5 V

Low supply current 1 µA

Integrated test mode

Single Smart Reset™ push-button input with fixed extended reset setup delay (t_SRC) from 0.5 s to 10 s in 0.5 s steps (typ.), option with internal input pull-up resistor

Push-button controlled reset pulse duration

Option 1: fully push-button controlled, no fixed or minimum pulse width guaranteed

Option 2: defined output reset pulse duration (t_REC), factory-programmed

Single reset output

Active low or active high

Push-pull or open drain with optional pull-up resistor

Fixed Smart Reset input logic voltage levels

Operating temperature: -40 °C to +85 °C

UDFN6 package 1.00 mm x 1.45 mm

ECOPACK® 2 (RoHS compliant, Halogen-Free)