MIC70 MICREL | Alldatasheet

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MIC705/6/7/8 µP Supervisory Circuits MIC705/6/7/8 µP Supervisory Circuits

MIC705/6/7/8 µP Supervisory Circuits

Electrical Characteristics

Operating Voltage Range, VCC MIC70-- 1.4 5.5 V Supply Current MIC70-- µA Reset Voltage Threshold MIC705, MIC707 4.50 4.65 4.75 V MIC706, MIC708 4.25 4.4 4.5 Reset Threshold Hysteresis mV Reset Pulse Width, tRS 140 200 280 ms RESET Output Voltage ISource = 800µA VCC - 1.5V V ISink = 3.2mA 0.4 MIC70--C, ISink = 50µA, VCC = 1.4V 0.3 RESET Output Voltage ISource = 800µA VCC - 1.5V V ISink = 1.2mA 0.4 Watchdog Timeout Period, tWD 1.0 1.6 2.25 sec WDI Minimum Input Pulse, tWP VIL = 0.4V, VIH = 80% of VCC ns WDI Threshold Voltage VIH, VCC = 5V 3.5 V VIL, VCC = 5V 0.8 WDI Input Current WDI = 0V -150 -50 µA WDI = VCC 150 WDO Output Voltage ISource = 800µA VCC - 1.5V V ISink = 1.2mA 0.4 Absolute Maximum Ratings Terminal Voltage Input Current Operating Temperature Range Stresses above those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent device failure. Functionality at or above these limits is not implied. Exposure to absolute maximum ratings for extended periods may affect device reliability. Operating ranges define those limits between which the functionality of the device is guaranteed.

MIC705/6/7/8 µP Supervisory Circuits MR = 0V 100 250 600 µA MR Pulse Width, tMR 150 nS MR Input Threshold VIL 0.8 V VIH 2.0 MR to Reset Output Delay, tMD 250 nS PFI Input Threshold VCC = 5V 1.2 1.25 1.3 V PFI Input Current -25 0.01 +25 nA PFO Output Voltage ISink = 3.2mA 0.4 V VCC = 5V, ISource = 800µA VCC - 1.5V

Manual Reset Input forces RESET to assert when pulled below 0.8V. An internal pull-up current of 250µA on this input forces it high when left floating. This input can also be driven from TTL or CMOS logic. Primary supply input, +5V. IC ground pin, 0V reference. Power fail input. Internally connected to the power fail comparator which is referenced to 1.25V. The power fail output (PFO) remains high if PFI is above 1.25V. PFI should be connected to GND or VOUT if the power fail comparator is not used. Power fail output. The power fail comparator is independent of all other functions on this device. Watchdog input. The WDI input monitors microprocessor activity, an internal watchdog timer resets itself with each transition on the watchdog input. If the WDI pin is held high or low for longer than the watchdog timeout period, WDO is forced to active low. The watchdog function can be disabled by floating the WDI pin. No Connect RESET is asserted if either VCC goes below the reset threshold or by a low signal on the manual reset input (MR). RESET remains asserted for one reset timeout period (200ms) after VCC exceeds the reset threshold or after the manual reset pin transitions from low to high. The watchdog timer will not assert RESET unless WDO is connected to MR. Output for the watchdog timer. The watchdog timer resets itself with each transition on the watchdog input. If the WDI pin is held high or low for longer than the watchdog timeout period, WDO is forced low. WDO will also be forced low if VCC is below the reset threshold and will remain low until VCC returns to a valid level. RESET is the compliment of RESET and is asserted if either VCC goes below the reset threshold or by a low signal on the manual reset input (MR). RESET is suitable for microprocessors systems that use an active high reset. Pin No. MIC705 MIC707 Pin Name MIC706 MIC708 MR VCC GND PFI PFO WDI N/A N/C N/A RESET WDO N/A RESET N/A Pin Functions MIC705/6/7/8 µP Supervisory Circuits

Alternate Source Cross Reference Guide MIC705/6/7/8 µP Supervisory Circuits

0.244 0.228 0.155 0.150 0.197 0.190 0.019 0.013 0.060 0.040 0.069 0.053 0.011 0.004 0.012 0.009 0.050 0.016 0-8¼ Pin 1 Identifier 0.260 0.240 0.400 0.370 0.023 0.015 0.110 0.090 0.150 0.120 0.150 0.125 0.035 0.015 0.370 0.300 0.310 0.290 M Package, 8-Pin Small Outline N Package, 8-Pin Plastic Dual-In-Line MIC705/6/7/8 µP Supervisory Circuits