DS1705 Dallas Semiconductor, DS1705 Datasheet
DS1705
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DS1705 Summary of contents
Page 1
... Industrial temperature range - +85 C DESCRIPTION The DS1705/DS1706 3.3- or 5.0-Volt MicroMonitor monitors three vital conditions for a microprocessor: power supply, software execution, and external override. A precision temperature compensated reference and comparator circuit monitor the status of V protection. When the sense input detects an out-of-tolerance condition a non-maskable interrupt is generated ...
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... The second function the DS1705/DS1706 performs is pushbutton reset control. The DS1705/DS1706 debounces the pushbutton input and guarantees an active reset pulse width of 130 ms minimum. The third function is a watchdog timer. The DS1705/DS1706 has an internal timer that forces the WDO signal to the active state if the strobe input is not driven low prior to time-out. ...
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... MICROMONITOR BLOCK DIAGRAM Figure 1 PUSH-BUTTON RESET Figure 2 signals active when the WDS input pin prior to time-out, the watchdog timer is reset and begins DS1705/DS1706 input is not clocked within the 1 ST (or RST) becomes inactive high- RST signal is driven active (low) for a WDS ...
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... TIMING DIAGRAM: PUSHBUTTON RESET Figure 4 NON-MASKABLE INTERRUPT CIRCUIT EXAMPLE Figure SENSE Example: Therefore: NMI 1.25 V MAX 4.50V at the trip point SENSE 3.3 = 12.4V maximum . 10k 4 1.25 10k DS1705/DS1706 AND Figure 3 WDS V SENSE = ...
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... WATCHDOG TIMER Figure 6 TIMING DIAGRAM: STROBE INPUT Figure 7 TIMING DIAGRAM: NON-MASKABLE INTERRUPT Figure DS1705/DS1706 ...
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... TIMING DIAGRAM: POWER-DOWN Figure DS1705/DS1706 ...
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... TIMING DIAGRAM: POWER-UP Figure DS1705/DS1706 ...
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... RECOMMENDED DC OPERATING CONDITIONS PARAMETER Supply Voltage and Input High Level ST PBRST and Input Low Level ST PBRST DC ELECTRICAL CHARACTERISTICS PARAMETER V Trip Point DS1705/DS1706L CC V Trip Point DS1706 CC V Trip Point DS1706T CC V Trip Point DS1706S CC V Trip Point DS1706P Input Leakage Output Current @ 2 ...
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... RPU RST PDLY t 1 IPD with an internal impedance =typical and the CC with an internal impedance of 180 k =typical. or ground. CC minimum will not cause a reset. CCTP DS1705/DS1706 =1.2V to 5.5V) CC TYP MAX UNITS ns 205 285 205 285 ms ns 250 ns 1 ...
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... PART MARKING CODES and D represents the device type and tolerance. ABCD 705_ - DS1705 706_ - DS1706 706L - DS1706L 706P - DS1706P 706R - DS1706R 706S - DS1706S 706T - DS1706T WWY represents the device manufacturing Work Week, Year. 8-PIN -SOP (118 MIL DS1705/DS1706 ...