Microprocessor Voltage Monitors with Manual Reset

Transcription

1 Microprocessor oltage Monitors with Manual Reset Description The FP6811 and FP6812 are cost-effective system supervisory circuits designed to monitor the power supply status in microprocessor µ and digital systems. In addition, they provide a de-bounced manual reset input pin to initiate a reset. These circuits assert a reset signal whenever the supply voltage declines below a preset threshold, keeping it asserted for at least 140ms after has risen above the reset threshold. The FP6811-N has an open-drain output stage, while FP6811-C and FP6812-C have push-pull outputs. The FP6811-N s open-drain output requires a pull-up resistor. The FP6811 has an active-low RESET output while the FP6812 has an active-high RESET output. The FP6811 and FP6812 are optimized to reject fast transient glitches on the line. A low supply current makes these devices suitable for portable equipment. Each device is available in a 4-pin SC-70-4 package format. Pin Assignments C4 Package (SC-70-4) TOP IEW 1. GND 2.RESET / RESET 3. MR 4. Figure 1. Pin Assignments of FP6811 / FP6812 Features Precision Monitoring of 2.5, 3.0, 3.3, and 5.0 Power-Supply oltages 140ms Guaranteed Minimum Reset Output Duration Low Supply Current Transient Immunity Small SC-70-4 Package No External Components Guaranteed Reset alid to =1 Available in Three Output Configurations Open-Drain RESET Output (FP6811-N) Push-Pull RESET Output (FP6811-C) Push-Pull RESET Output (FP6812-C) RoHS Compliant Applications Computers Battery Powered Equipments Microprocessor Power Supply Monitoring Embedded Systems Automotive Ordering Information FP6811/12- TR: Tape Reel Blank: Tube P: Pb Free with Commercial Standard (RoHS Compliant) Package Type C4: SC-70-4 N: Open-Drain (FP6811only) C: Push-Pull Reset oltage 23: : : : : : : 3.08 FP6811: Active Low Reset FP6812: Active High Reset Note Please consult Fitipower sales office or authorized distributors for availability of special reset voltages. 1

2 SC-70-4 Marking (FP6811) FP NC4P Ka FP CC4P Km FP NC4P Kb FP CC4P Kn FP NC4P Kd FP CC4P Kr FP NC4P Ke FP CC4P Ks SC-70-4 Marking (FP6812) FP CC4P CL FP CC4P CR FP CC4P CM FP CC4P CS FP CC4P CN FP CC4P CT FP CC4P CP FP NC4P Kf FP CC4P Kt FP NC4P Kh FP CC4P Ku FP NC4P Ki FP CC4P Kv Typical Application Circuit Figure 2. Typical Application Circuit of FP6811/FP6812 Functional Pin Description Pin Name Pin Function GND RESET (FP6811) RESET (FP6812) MR Ground RESET Output remains low while is below the reset threshold or while MR is held low, and for at least 140ms after rises above the reset threshold. RESET Output remains high while is below the reset threshold or while MR is held low, and for at least 140ms after rises above the reset threshold. Manual Reset Input. Driving low to force a reset. Reset remains active as long as MR is low and for the reset timeout period after MR is released. MR has an internal 63 k pull up resistor to CC. Supply oltage 2

3 Block Diagram MR CC Reset Generator RESET Bandgap GND Absolute Maximum Ratings Figure 3. Block Diagram of FP6811/FP6812 Supply oltage ( to GND ) to +6 RESET, RESET oltage (Push-Pull) to (cc+0.3) RESET oltage (Open Drain) to (cc+0.3) Input Current ( ) mA Output Current, RESET, RESET mA Rate of Rise ( ) /us Power T A =70, SC-70-4 (P D ) mW Package Thermal Resistance, SC-70-4 (θ JA ) /W Junction Temperature (T J ) Storage Temperature (T S ) to +150 Lead Temperature (Soldering, 10sec) Note Stresses beyond those listed under Absolute Maximum Ratings" may cause permanent damage to the device. Recommended Operating Conditions Supply oltage ( to GND ) to +5.5 Operation Temperature Range to +85 3

4 Electrical Characteristics ( =full range, T A =25, unless otherwise specified.) Parameter Symbol Conditions Min Typ. Max Unit Range Supply Current I CC <5.5, FP68-46/44/40 3 <3.6, FP68-23/26/29/31 3 µa FP / FP FP / FP FP / FP Reset Threshold TH FP / FP FP / FP FP / FP FP / FP Reset Threshold Tempco 30 ppm/ºc MR Input Threshold IH 2.3 > TH(MAX), 3 IL IH 0.7 > TH(MAX), <3 IL MR Glitch Immunity 100 ns to Reset Delay = TH to (th-100m) 20 us Reset Active Timeout Period ms RESET Output oltage Low (Push-Pull active low and Open-Drain active low, FP6811) RESET Output oltage Low (push-pull active high, FP6812) RESET Output oltage High (push-pull active low, FP6811) OL OL OH = TH min, I SINK =1.2mA, FP /26/29/31 = TH min, I SINK =3.2mA, FP / >1.0, I SINK =50uA 0.3 = TH max, I SINK =1.2mA, FP /26/29/ = TH max, I SINK =3.2mA, FP / > TH max, I SOURCE =500uA, FP /26/29/31 0.8cc > TH max, I SOURCE =800uA, FP /46 cc-1.5 RESET Output oltage High (push-pull active high, FP6812) RESET Open-Drain Output Leakage Current (FP6811-N) OH 1.8< < TH min, I SOURCE =150uA 0.8cc > TH, RESET de-asserted 1 µa 4

5 Typical Performance Curves Normalized Threshold Power-up Reset Timeout(ms) Temperature ( o C) Temperature( o C) Figure 4. Normalized Reset Threshold vs. Temperature Figure 5. Power-up Timeout vs. Temperature RESET RESET Figure 6. Power-Up RESET Timeout Waveforms; Figure 7. Power-Down RESET Delay Waveforms; Manual Reset OUT Manual Reset OUT Figure 8. Manual Reset oltage On Waveform for - TH =3.1 Figure 9. Manual Reset oltage Off Waveform for - TH =3.1 5

6 Typical Performance Curves (Continued) 5 4 FP6811_26,cc=3.3 FP6809_26,cc=3.3 FP6811_31,cc=3.3 FP6809_31, FP6811_46,cc=5 FP6809_46, FP6809_26 FP6811_26 FP6809_31 FP6811_31 FP6809_46 FP6811_46 Supply Current(uA) 3 2 IDS(mA) Temperatrue( o C) Figure 10. Supply Current vs. Temperature DS(v) Figure 11. Output Sinking Capability FP6809_26 FP6811_26 FP6809_31 FP6811_31 FP6809_46 FP6811_46 20 IDS(mA) DS(v) Figure 12. Output Sourcing Capability 6

7 Outline Information SC-70-4 Package (Unit: mm) SYMBOLS UNIT DIMENSION IN MILLIMETER MIN NOM MAX A A A b c D E E e TYP --- e L REF --- L θ - 15 Note 1 Package Body Sizes Exclude Mold Flash and Gate Burrs. Note 2 Tolerance ± 0.10 mm(4 mil) Unless Otherwise Specified. Note 3 Controlling Dimension Is Millimeter. Converted Inch Dimension Are Not Necessarily Exact. Note 4 Followed from EIAJ ED Note 5 Dimension L Is measured Form 0.1 mm above Seated Plane. Life Support Policy Fitipower s products are not authorized for use as critical components in life support devices or other medical systems. 7