AS1918Z-T ams

austriamicrosystems AG is now ams AG The technical content of this austriamicrosystems datasheet is still valid. Contact information: Headquarters: ams AG Tobelbaderstrasse 30 8141 Unterpremstaetten, Austria Tel: +43 (0) 3136 500 0 e-Mail: ams sales ams.com Please visit our website at www.ams.com Datasheet AS1916 - AS1918 Microprocessor Supervisory Circuits with Manual Reset and Watchdog 1 General Description 2 Key Features VCC Supervisory Range: +1.8 to +3.6V The AS1916 - AS1918 microprocessor supervisory circuits were designed to generate a reset when the monitored supply voltage falls Guaranteed Reset Valid Down to VCC = +1.0V below a factory-trimmed threshold. The reset remains asserted for a Reset Timeout Delay: 215ms minimum timeout period after the supply voltage stabilizes. Manual Reset Input Guaranteed to be in the correct state for VCC higher than +1.0V, these devices are ideal for portable and battery-powered systems Three Reset Output Types with strict monitoring requirements. - Active-Low Push/Pull (AS1916) The devices feature factory-trimmed thresholds to monitor a supply - Active-High Push/Pull (AS1917) voltage between 1.8 and 3.6V. - Active-Low Open-Drain (AS1918) The devices are available with the reset output types listed in Table 1. Watchdog Timeout Period: 1.5s Table 1. Standard Products Immune to Fast Negative VCC Transients Model Reset Output Type External Components Not Required AS1916 Active-Low Push/Pull Operating Temperature Range: -40 to +125C AS1917 Active-High Push/Pull 5-pin SOT23 Package AS1918 Active-Low Open-Drain The AS1916 - AS1918 include a manual-reset input for systems that 3 Applications never fully power down the microprocessor. The devices are ideal for portable and battery-powered systems, Additionally, these devices feature a watchdog timer to help ensure embedded controllers, intelligent instruments, automotive systems, that the processor is operating within proper code boundaries. and critical CPU monitoring applications. The AS1916 - AS1918 are available in a 5-pin SOT23 package. Figure 1. Typical Application Diagram I/O Supply 5 1 VCC VCC RESETN RESETN AS1916/ CPU AS1918 3 External 4 MRN GND Reset WDI I/O GND 2 www.austriamicrosystems.com/Supervisors/AS1916 Revision 1.04 1 - 14 ams AG Technical content still valid