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DS1831C/D/E 3.3V/2.5V Multisupply MicroMonitor www.maxim-ic.com FEATURES PIN ASSIGNMENT 2.5V power-on reset DS1831C 3.3V power-on reset Two referenced comparators with separate IN 1 16 IN 2.5V 3.3V outputs for monitoring additional supplies RST 2 15 RST 2.5V 3.3V Internal power is drawn from higher of either TOL 3 14 TOL 2.5V 3.3V the IN input or the IN input 2.5V 3.3V Excellent for systems designed to operate TD 4 13 TD 2.5V 3.3V with multiple power supplies PBRST 5 12 PBRST 2.5V 3.3V Asserts resets during power transients IN1 6 11 NMI1 Pushbutton reset input for system override IN2 7 10 NMI2 Maintains reset for user configurable times of 10ms, 100ms, or 1s GND 8 9 MPBRST Watchdog timer for software monitoring 16-Pin (300mil) DIP (DS1831D) & Precision temperature-compensated voltage 16-Pin (150mil) SO reference and voltage sensor 16-pin DIP and 16-pin 150mil SO available Operating Temperature of -40C to +85C DS1831D DS1831E IN 1 16 IN IN 1 16 IN 2.5V 3.3V 2.5V 3.3V RST 2 15 RST 2.5V 3.3V RST 2 15 RST 2.5V 3.3V TOL 3 14 TOL TOL 3 14 TOL 2.5V 3.3V 2.5V 3.3V TD 4 13 TD TD TD 2.5V 3.3V 4 13 2.5V 3.3V PBRST 5 12 PBRST PBRST 5 12 PBST 2.5V 3.3V 2.5V IN1 6 11 NMI1 IN1 6 11 NMI1 ST 7 10 WDS IN2 7 10 NMI2 GND 8 9 TD WD GND 8 9 MPBRST 16-Pin (300mil) DIP 16-Pin (300mil) DIP & & 16-Pin (150mil) SO 16-Pin (150mil) SO DESCRIPTION The DS1831C multisupply monitor and reset monitors up to four system voltages: 2.5V supply, 3.3V (or 3V) supply, and two additional user configurable voltage monitors. DS1831 power for internal operation comes from the higher voltage level of the 3.3V input or the 2.5V input. One of these inputs must be greater than 1V for device operation. Pushbutton (manual reset) functionality is provided for the 2.5V 1 of 15 060303DS1831C/D/E reset, the 3.3V reset or for all reset outputs by the master pushbutton. The DS1831D replaces one reference comparator and the master pushbutton with watchdog and the DS1831E replaces the 3.3V PBRST with a last reset status output. TOL and TD inputs allow user configuration of the DS1831 for multiple applications. The TOL inputs configure the tolerance for the specified output and the TD inputs configure the reset time delays. PIN DESCRIPTION IN 2.5V Power Supply Input Master Pushbutton (DS1831C/E) 2.5V MPBRST Watchdog Time Delay Select TD WD (DS1831D) RST 2.5V Reset Open Drain NMI2 Non-maskable Interrupt 2 (DS1831C/E) 2.5V Output Watchdog Status Output (DS1831D) WDS TOL Selects 2.5V Input NMI1 Non-maskable Interrupt 1 2.5V Tolerance TD Selects 2.5V Reset Time PBRST 3.3V Reset Pushbutton (DS1831C/E) 2.5V 3.3V Delay PBST Pushbutton Status Output (DS1831E) 2.5V Reset Pushbutton TD Select 3.3V Reset Time Delay PBRST 3.3V 2.5V IN1 Sense Input 1 TOL Selects 3.3V Input Tolerance 3.3V IN2 Sense Input 2 (DS1831C/E) RST 3.3V Reset Open Drain Output 3.3V Watchdog Strobe Inputs ST (DS1831D) GND Ground IN 3.3V Power Supply Input 3.3V 2 of 15
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