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ILC708N 数据表(PDF) 4 Page - Impala Linear Corporation |
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ILC708N 数据表(HTML) 4 Page - Impala Linear Corporation |
4 / 5 page mP Supervisory Circuit Impala Linear Corporation 4 (408) 574-3939 www.impalalinear.com Sept 1999 ILC705-708 1.0 WDO tMD VRT tRS VCC RESET MR tRS tMR Microprocessor Reset The RESET pin is asserted whenever V CC falls below the reset threshold voltage or when MR goes low. The reset pin remains asserted for a period of 200ms after V CC has risen above the reset threshold voltage and MR goes high. The reset function ensures the microprocessor is properly reset and powers up into a known condition after a power failure. RESET will remain valid with V CC as low as 1.4V Watchdog Timer The microprocessor can be monitored by connecting the WDI pin (watchdog input) to a bus line or I/O line. If a tran- sition does not occur on the WDI pin within the watchdog timeout period, then WDO will go low. A minimum pulse of 50ns or any transition low-to-high or high-to-low on the WDI pin will reset the watchdog timer. The output of the watch- dog timer (WDO) will remain high if WDI sees a valid tran- sition within the watchdog timeout period or if WDI is left floating. If VCC falls below the reset threshold voltage then WDO goes low immediately regardless of WDI. If WDI is left floating, then WDO can be used as a low line indicator. Manual Reset The manual-reset input (MR) allows reset to be triggered by a pushbutton switch which is debounced by the 140ms min- imum reset pulse width. MR can be driven by external TTL/CMOS compatible logic. By connecting WDO to MR a watchdog timeout will generate a reset pulse in the ILC705/ILC706. Power Fail Warning An additional comparator which is independent of other functions on the ILC705/706/707/708 is provided for early warning of power failure. An external voltage divider can be used to compare unregulated DC to an internal 1.25V ref- erence. The voltage divider ratio on the input of the power fail comparator (PFI) can be chosen so as to trip the power fail comparator a few milliseconds before VCC falls below the maximum reset threshold voltage. The output of the power fail comparator (PFO) can be used to interrupt the microprocessor when used in this mode and execute shut- down procedures prior to power loss 5 PFO 4 PFI - + 1.25 V R1 R2 Unregulated DC Industry P/N ILC Direct Replacement MAX705CPA ILC705N MAX705CSA ILC705M MAX705EPA ILC705N MAX705ESA ILC705M ADM705AN ILC705N DS1705 ILC705 MAX706CPA ILC706N MAX706CSA ILC706M MAX706EPA ILC706N MAX706C/D ILC706D ADM706AN ILC706N DS1706 ILC706 MAX707CPA ILC707N MAX707CSA ILC707M MAX707EPA ILC707N MAX707ESA ILC707M MAX707C/D ILC707D ADM707AN ILC707N DS1707 ILC707 MAX708CPA ILC708N MAX708CSA ILC708M MAX708EPA ILC708N MAX708ESA ILC708M MAX708C/D ILC708D ADM708AN ILC708N DS1708 ILC708 Circuit Description Alternate Reference Guide |
类似零件编号 - ILC708N |
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类似说明 - ILC708N |
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