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MAX814_CSA Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX814_CSA Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 16 page ±1% Accuracy, Low-Power, +3V and +5V µP Supervisory Circuits _______________________________________________________________________________________ 7 _______________Detailed Description The MAX814/MAX815/MAX816 are high-accuracy, low- power microprocessor (µP) supervisory circuits. They have µP-reset, watchdog-timer, and power-fail func- tions. Typical applications illustrating their similarities and differences are shown in Figures 1, 2, and 3. Figures 4, 5, and 6 show the block diagrams of these parts. ______________________________________________________________Pin Description PIN MAX814 MAX815 MAX816 NAME FUNCTION 1 1 1 MR Manual-Reset Input. Triggers a reset when pulled below 1.10V. This active- low input has an internal 150µA pullup current to VCC, and can be driven with CMOS logic or shorted to GND with a switch or transistor. 2 2 — Positive Power-Supply Input. When VCC is below the reset threshold voltage*, RESET is low, and remains low for a minimum of 140ms after it rises above the threshold. — — 2 VCC Positive Power-Supply Input. On the MAX816, RESET is controlled by RESET IN, not VCC. 3 3 3 GND Ground 4 4 4 PFI Power-Fail Input. The PFI threshold voltage is 1.70V on the MAX816 and on MAX814/MAX815 parts with the T suffix. It is 2.50V on MAX814/MAX815 parts with K, L, and N suffixes. Connect PFI to GND or VCC when not used. 5 5 5 PFO Power-Fail Output. When PFI is below its threshold, PFO is low; otherwise it is high. — 6 — WDI Watchdog CMOS Input. If WDI remains high or low for more than 1.56s, the watchdog timer times out, and WDO goes low. The timer is reset to zero on each WDI transition. 6 — — LOW LINE Low-Line Output. Normally high, LOW LINE goes low when VCC falls 60mV above the reset threshold. It returns high as soon as VCC rises above the low-line threshold. — — 6 RESET IN Reset Comparator Input. Reference is 1.70V. When RESET IN is below 1.70V, RESET is low, and remains low for a minimum of 140ms after it rises above the reference. 7 7 7 RESET Reset Output. Normally high, active low. Controlled by MR and reset comparator. 8 — 8 RESET Reset Output. Active high. The inverse of RESET. — 8 — WDO Watchdog Output. Normally high, WDO goes low whenever the VCC reset threshold comparator input voltage is low or when the watchdog timer times out. There is no appreciable delay going either direction when the VCC threshold comparator toggles. *Reset Threshold Voltage is determined by part number suffix: K = 4.80V, L = 4.70V, N = 4.55V, T = 3.03V. |
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