DS1819 Dallas Semiconductor, DS1819 Datasheet
DS1819
Available stocks
Related parts for DS1819
DS1819 Summary of contents
Page 1
... DESCRIPTION The DS1814 5-Volt MicroMonitor and the DS1819 3.3V MicroMonitor monitor three vital conditions for a microprocessor: power supply, software execution, and external override. First, a precision temperature- compensated reference and comparator circuit monitor the status of V condition occurs, an internal power-fail signal is generated which forces the reset( active state. ...
Page 2
... The DS1814/DS1819 ‘A’ and ‘C’ perform pushbutton reset control. They debounce the pushbutton input and generate an active reset pulse width of 140ms minimum. The DS1814/9 ‘A’ and ‘B’ versions perform a watchdog function. The watchdog is an internal timer that forces the reset signals to the active state if www ...
Page 3
... DS1814/DS1819 BLOCK DIAGRAM Figure 1 www.DataSheet4U.com *Notes: available on'A' and 'B' versions ST available on 'A' and 'C' versions PBRST RST available on 'B' and 'C' versions PUSHBUTTON RESET Figure 2 TIMING DIAGRAM: PUSHBUTTON RESET Figure DS1814/DS1819 ...
Page 4
... WATCHDOG TIMER Figure 4 www.DataSheet4U.com TIMING DIAGRAM: STROBE INPUT Figure 5 WATCHDOG DISABLE CIRCUIT Figure 6 TIMING DIAGRAM: POWER-DOWN Figure DS1814/DS1819 ...
Page 5
... A value of about 100kW should be adequate in most situations. The output with a resistor pull-down can maintain a valid reset down to V Figure Ground (see Figure 9.) This arrangement RST during both power-up and -down but will draw current when RST equal to 0V DS1814/DS1819 . To sink CC is RST ...
Page 6
... CC V Trip Point DS1819 Trip Point DS1819- Trip Point DS1819-20 CC Reset Trip Point Hysteresis (DS1814) Reset Trip Point Hysteresis (DS1819) Output Current @ 2.4V Output Current @ 0.4V Output Voltage @ -30 mA Operating Current DS1814 Operating Current DS1819 Input Current Time Averaged ST CC ...
Page 7
... SYMBOL MIN OUT with an internal impedance of 50kW typical. CC £ 5.5V, and all inputs input open. ST £ 3.6V, and all inputs input open. ST minimum will not cause a reset and V CCTP DS1814/DS1819 = 1.2V to 5.5V) CC TYP MAX UNITS ms 200 280 ms ns 1.60 2. 12.5 V/ms ...
Page 8
... PART MARKING CODES www.DataSheet4U.com ‘A’, ‘B’ and ‘C’ represents the Device Type. 14A - DS1814A 14B - DS1814B 14C - DS1814C 19A - DS1819A 19B - DS1819B 19C - DS1819C SOT-23-5 PACKAGE ‘D’ represents the Device Tolerance DS1814/DS1819 5% 10% 20% ...