 |
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
| Datasheet File OCR Text: |
| MIC706P/R/S/T, MIC708R/S/T P Supervisory Circuits MIC706P/R/S/T, MIC708R/S/T P Supervisory Circuits Description The MIC706P/R/S/T and MIC708R/S/T are inexpensive microprocessor supervisory circuits that monitor power supplies in 3.0 and 3.3 Volt microprocessor based systems. The circuit functions include a watchdog timer, microprocessor reset, power failure warning and a debounced manual reset input. The MIC706 offers a watchdog timer function, while the MIC708 has no watchdog timer but has an active high reset output in addition to the active low reset output. The R, S, and T versions are similar in all respects except for supply voltage reset threshold levels. The threshold levels are 2.63, 2.93, and 3.08V respectively. When the supply voltage drops below the reset threshold level, RESET (and RESET for the MIC708) is asserted. The MIC706P is identical to the MIC706R, except that the Reset output is asserted high. Pin Configuration Top View MR VCC GND PFI 1 2 8 7 WDO RESET (RESET for MIC706P) WDI PFO MIC706 3 4 6 5 N Package - 8 Lead Plastic DIP Package M Package - 8 Lead Plastic SOIC Package MR VCC GND PFI 1 2 8 7 RESET RESET NC PFO MIC708 3 4 6 5 Features Typical Applications * 30A Maximum Supply Current * Debounced Manual Reset Input is * Reset Pulse Width, 200ms * Watchdog Timer, 1.6s (MIC706) * Precision Supply Voltage Monitor * Early Power Fail Warning or Low Battery Detect TTL/CMOS Compatible * Laptop Computers * Intelligent Instruments * Critical Microprocessor Power Monitoring * Printers * Computers * Controllers Ordering Information Part MIC70_ _N MIC70_ _M Package 8-Lead PDIP 8-Lead SOIC Temp. Range -40C to +85C -40C to +85C Typical Operating Circuit +3.0 or +3.3V (Regulated) Manual Reset MR VCC RESET VCC RESET MIC706 DC Voltage (Unregulated) PFI WDI WDO PFO NMI P I/O Line Interrupt 1 MIC706P/R/S/T, MIC708R/S/T P Supervisory Circuits Absolute Maximum Ratings Terminal Voltage VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6.0V All Other Inputs . . . . . . . . . . . . -0.3V to (VCC + 0.3V) Input Current VCC, Gnd. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25mA Output Current (all outputs) . . . . . . . . . . . . . . . . . 20mA Operating Temperature Range MIC70_N, MIC70_M . . . . . . . . . . . . . . . . . -40C to 85C Storage Temperature Range . . . . . . . . . . . . .-65C to 150C Lead Temperature (Soldering - 10 sec.) . . . . . . . . . . . 300C Power Dissipation (PDIP) . . . . . . . . . . . . . . . . . . . . 475mW Power Dissipation (SOIC) . . . . . . . . . . . . . . . . . . . . 400mW 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. Electrical Characteristics VCC = 2.70V to 5.5V for MIC70_P/R, VCC = 3.00V to 5.5V for MIC70_S, VCC = 3.15V to 5.5V for MIC70_T, TA = -40C to 85C unless otherwise noted. Parameter Operating Voltage Range, VCC Supply Current Reset Voltage Threshold MIC70_P/R MIC70_S MIC70_T 2.55 2.85 3.00 2.63 2.93 3.08 20 140 ISource = 200A ISink = 1.2mA ISink = 50A, VCC = 1.4V ISource = 200A ISink = 1.2mA ISource = 200A ISink = 500A 0.8 x VCC 200 280 Conditions Min 1.4 Typ Max 5.5 30 2.70 3.00 3.15 Units V A V Reset Threshold Hysteresis Reset Pulse Width, tRS RESET Output Voltage (MIC70_R/S/T) mV ms V 0.3 0.3 V 0.3 V 0.3 RESET Output Voltage (MIC706P) RESET Output Voltage (MIC708R/S/T) Watchdog Timeout Period, tWD WDI Minimum Input Pulse, tWP WDI Threshold Voltage WDI Input Current WDO Output Voltage 0.8 x VCC 0.8 x VCC 1.0 1.6 2.25 sec ns ns V VIL = 0.4V, VIH = 80% of VCC VIL = 0.4V, VIH = 80% of VCC>4.5V VIH VIL WDI = 0V or VCC ISource = 200A ISink = 500A 100 50 0.7 x VCC -1 0.8 x VCC 0.6 1 A V 0.3 2 MIC706P/R/S/T, MIC708R/S/T P Supervisory Circuits Electrical Characteristics VCC = 2.70V to 5.5V for MIC70_P/R, VCC = 3.00V to 5.5V for MIC70_S, VCC = 3.15V to 5.5V for MIC70_T, TA = -40C to 85C unless otherwise noted. Parameter MR Pull-Up Current MR Pulse Width, tMR MR Input Threshold MR to Reset Output Delay, tMD PFI Input Threshold PFI Input Current PFO Output Voltage ISink = 1.2mA ISource = 200A 1.2 -25 0.8 x VCC 1.25 0.01 Conditions MR = 0V Min 20 500 150 0.6 0.7 x VCC 750 1.3 +25 0.3 nS V nA V Typ 250 Max 600 Units A nS nS V VCC > 4.5V VIL VIH 3 MIC706P/R/S/T, MIC708R/S/T P Supervisory Circuits Pin Functions Pin No. Pin Name MR MIC706 R/S/T 1 MIC706P 1 MIC708 1 Manual Reset Input forces reset outputs to assert when pulled below 0.8V. An internal pull-up current of 250A 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 V OUT 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 cannot be disabled. No Connect RESET is asserted if either V CC 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 V CC 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. VCC GND PFI 2 3 4 2 3 4 2 3 4 PFO WDI 5 6 5 6 5 N/A N/C RESET N/A 7 N/A N/A 6 7 WDO 8 8 N/A RESET N/A 7 8 4 MIC706P/R/S/T, MIC708R/S/T P Supervisory Circuits Block Diagram VCC 250A MR (1) VCC (2) VTHR * + - RESET GENERATOR RESET (7) (RESET for MIC706P) WDO (8) WDI (6) WATCHDOG TIMER PFI (4) 1.25V + PFO (5) - * 2.63, 2.93, or 3.08V Figure 1. MIC706 Block Diagram VCC 250A MR (1) RESET (8) VCC (2) VTHR* + - RESET GENERATOR RESET (7) PFI (4) 1.25V + PFO (5) - * 2.63, 2.93, or 3.08V Figure 2. MIC708 Block Diagram 5 MIC706P/R/S/T, MIC708R/S/T P Supervisory Circuits Circuit Description Power Fail Warning An additional comparator which is independent of other functions on the MIC706/MIC708 is provided for early warning of power failure. An external voltage divider the WDI pin will reset the watchdog timer. The output of the watchdog timer (WDO) will remain high if WDI sees a valid transition within the watchdog timeout period. If VCC falls below the reset threshold voltage then WDO goes low immediately regardless of WDI. Likewise, WDO goes high immediately after VCC exceeds the reset threshold. WDO can be connected to MR to generate a reset pulse upon watchdog timeout. Microprocessor Reset The RESET pin is asserted whenever VCC falls below the reset threshold voltage or when MR goes low. The reset pin remains asserted for a period of 200ms after Unregulated DC R1 PFI + R2 1.25V - PFO VCC Figure 3. Power Fail Comparator can be used to compare unregulated DC to an internal 1.25V reference. 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. Watchdog Timer The microprocessor can be monitored by connecting the WDI pin (watchdog input) to a bus line or I/O line. If a transition doesn't occur on the WDI pin within the watchdog timeout period, then WDO will go low. A minimum pulse of 50ns (4.5V supply) or 100ns (2.7V supply) or any transition low-to-high or high-to-low on VRT tMR MR tMD RESET WDO tRS tRS Figure 4. Reset Timing Diagram VCC 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 VCC as low as 1.4V. 6 MIC706P/R/S/T, MIC708R/S/T P Supervisory Circuits Alternate Source Cross Reference Guide MIC Direct Replacement MIC706PN MIC706PM MIC706PN MIC706PM MIC706PN MIC706PM MIC706RN MIC706RM MIC706RN MIC706RM MIC706RN MIC706RM MIC706SN MIC706SM MIC706SN MIC706SM MIC706SN MIC706SM MIC706TN MIC706TM MIC706TN MIC706TM MIC706TN MIC706TM MIC708RN MIC708RM MIC708RN MIC708RM MIC708RN MIC708RM MIC708SN MIC708SM MIC708SN MIC708SM MIC708SN MIC708SM MIC708TN MIC708TM MIC708TN MIC708TM MIC708TN MIC708TM Industry P/N MAX706PCPA MAX706PCSA MAX706PEPA MAX706PESA DS706PEPA DS706PESA MAX706RCPA MAX706RCSA MAX706REPA MAX706RESA DS706REPA DS706RESA MAX706SCPA MAX706SCSA MAX706SEPA MAX706SESA DS706SEPA DS706SESA MAX706TCPA MAX706TCSA MAX706TEPA MAX706TESA DS706TEPA DS706TESA MAX708RCPA MAX708RCSA MAX708REPA MAX708RESA DS708REPA DS708RESA MAX708SCPA MAX708SCSA MAX708SEPA MAX708SESA DS708SEPA DS708SESA MAX708TCPA MAX708TCSA MAX708TEPA MAX708TESA DS708TEPA DS708TESA 7 MIC706P/R/S/T, MIC708R/S/T P Supervisory Circuits Packaging Information M Package, 8-Pin Small Outline 0.197 0.190 Pin 1 Identifier 0.155 0.150 0.244 0.228 0.069 0.053 0.060 0.019 0.013 0.040 0.011 0.004 0.012 0.009 0-81/4 0.050 0.016 N Package, 8-Pin Plastic Dual-In-Line 0.400 0.370 0.260 0.240 0.310 0.290 0.150 0.120 0.035 0.015 0.150 0.125 0.110 0.090 0.023 0.015 0.370 0.300 8 |
Price & Availability of MIC706P
 |
|
|
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
| [Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
|
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |