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| 3 PIN MICROPROCESSOR RESET MONITORS FSP2200 FEATURES Precision VCC Monitor for 2.5 V, 3.0V, 3.3 V, and 5.0 V Supplies Fully Specified Over Temperature Available in Three Output Configurations Push-Pull RESET Output 140ms min Power-On Reset Pulse Width 12A Supply Current Guaranteed Reset Valid to Vcc=+1V Power Supply Transient Immunity No External Components SOT323-3L and SOT23-3L Packages GENERAL DESCRIPTION The FSP2200 is a microprocessor supervisory circuits used to monitor the power supplies in MPU and digital systems. They provide excellent circuit reliability and low cost by eliminating external components and adjustments when used with +5V, +3.3V, +3.0V, or +2.5V powered circuits These curcuits perform a single function: they assert a reset signal whenever the Vcc supply voltage declines below a preset threshold, keeping it asserted for at least 140ms after Vcc has risen above the reset threshold. Reset thresholds suitable for operation whit a variety of supply voltages are available. The FSP2200 have push-pull outputs, an active-low RESET output. The reset comparator is designed to ignore fast transients on Vcc, and the outputs are guaranteed to be in the correct logic state for Vcc down to 1V. Low supply current makes the FSP2200 ideal for use in portable equipment. The FSP2200 are available in SOT323-3L or SOT23-3L packages. APPLICATIONS Computers Controllers Intelligent Instruments Critical MPU and MPU Power Monitoring Portable/Battery-Powered Equipment Automotive PIN CONFIGURATION (Top View) GND 1 3 RESET 2 VCC Pin 1 2 3 Name GND RESET VCC Function Ground reference Active-low output. RESET remains low while VCC is below the reset threshold, and for a reset timeout period after VCC rises above the reset threshold. Supply voltage (typ.) TYPICAL OPERATION CIRCUIT 1/7 2007-2-8 3 PIN MICROPROCESSOR RESET MONITORS FSP2200 ABSOLUTE MAXIMUM RATINGS Parameter Terminal Voltage (with respect to GND) Output Current, RESET Rate of Rise, VCC Continuous Power Dissipation(TA=70C) SOT323-3L SOT23-3L Operating Temperature Range Storage Temperature Range Lead Temperature (Soldering, 10 Seconds) SOT323-3L SOT23-3L Tstg TL Symbol VCC VRESET(push-pull) VRESET(push-drain) Value -0.3 to 6.0 -0.3 to (VCC + 0.3) -0.3 to 6.0 20 100 174 320 -40 to +125 -40 to +105 -65 to +150 300 mA V/s mW C C C Unit V ELECTRICAL CHARACTERISTICS (Vcc=full range, TA = -40C to +105C(SOT23) or TA = -40C to +125C(SOT323)unless otherwise noted.) Parameter Symbol Conditions Min. Typ. Max. TA=0C to +70 1.0 5.5 Vcc Range TA=-40C to +105C(SOT23) 1.2 5.5 TA=-40C to +125C(SOT323) 1.2 5.5 24 60 VCC5.5V,FSP2200-4.63/4.38 TA=-40C VC3.6V, to +85C 17 50 Supply FSP2200-2.32/2.63/2.93/3.08 ICC Current(SOT23) 100 VCC5.5V,FSP2200-4.63/4.38 TA=+85C VCC3.6V, to +105C 100 FSP2200-2.32/2.63/2.93/3.08 24 35 VCC5.5V,FSP2200-4.63/4.38 TA=-40C VCC3.6V, to +85C 17 30 FSP2200-2.32/2.63/2.93/3.08 Supply ICC Current(SOT323) 60 VCC5.5V,FSP2200-4.63/4.38 TA=+85C VCC3.6V, to +125C 60 FSP2200-2.32/2.63/2.93/3.08 TA=+25C 4.56 4.63 4.70 FSP2200TA=-40C to +85C 4.50 4.75 4.63 TA=-40C to +105C 4.40 4.86 TA=+25C 4.31 4.38 4.45 FSP2200TA=-40C to +85C 4.25 4.50 4.38 TA=-40C to +105C 4.16 4.56 TA=+25C 3.93 4.00 4.06 FSP2200TA=-40C to +85C 3.89 4.10 4.00 TA=-40C to +105C 3.80 4.20 Reset Threshold VTH (SOT23) TA=+25C 3.04 3.08 3.11 FSP2200TA=-40C to +85C 3.00 3.15 3.08 TA=-40C to +105C 2.92 3.23 TA=+25C 2.89 2.93 2.96 FSP2200TA=-40C to +85C 2.85 3.00 2.93 TA=-40C to +105C 2.78 3.08 TA=+25C 2.59 2.63 2.66 FSP2200TA=-40C to +85C 2.55 2.70 2.63 TA=-40C to +105C 2.50 2.76 Unit V A V 2/7 2007-2-8 3 PIN MICROPROCESSOR RESET MONITORS FSP2200 ELECTRICAL CHARACTERISTICS (CONTINUED) (Vcc=full range, TA = -40C to +105C(SOT23) or TA = -40C to +125C(SOT323)unless otherwise noted.) Parameter Symbol Conditions Min. Typ. Max. Unit TA=+25C 4.56 4.63 4.70 FSP2200TA=-40C to +85C 4.50 4.75 4.63 TA=-40C to +125C 4.44 4.82 TA=+25C 4.31 4.38 4.45 FSP2200TA=-40C to +85C 4.25 4.50 4.38 TA=-40C to +125C 4.20 4.56 TA=+25C 3.04 3.08 3.11 FSP2200TA=-40C to +85C 3.00 3.15 3.08 Reset Threshold TA=-40C to +125C 2.95 3.21 V VTH (SOT323) TA=+25C 2.89 2.93 2.96 FSP2200TA=-40C to +85C 2.85 3.00 2.93 TA=-40C to +125C 2.81 3.05 TA=+25C 2.59 2.63 2.66 FSP2200TA=-40C to +85C 2.55 2.70 2.63 TA=-40C to +125C 2.52 2.74 TA=+25C 2.28 2.32 2.35 FSP2200TA=-40C to +85C 2.25 2.38 2.32 TA=-40C to +125C 2.22 2.42 Reset Threshold 30 ppm/C Tempco Vcc to Reset Vcc= VTH to (VTH-100mV) 20 s Delay Reset Active TA=-40C to +85C 140 240 560 Timeout TA=-40C to +105C 100 840 Period(SOT23) ms Reset Active TA=-40C to +85C 140 240 460 Timeout TA=-40C to +125C 100 840 Period(SOT323) Vcc=VTH min, ISINK=1.2mA 0.3 RESET Output FSP2200-2.32/2.63/2.93/3.08 Voltage Low Vcc=VTH min, ISINK=3.2mA VOL 0.4 (push-pull active FSP2200-4.00/4.38/4.63 V low) 0.3 Vcc1.0V, ISINK=50A VccVTH max, ISOURCE=500A FSP2200-2.32/2.63/2.93/3.08 VOH VccVTH max, ISOURCE=80A FSP2200-4.00/4.38/4.63 Typical Values: TA=-+25C Vcc=5V for FSP2200-4.00/4.38/4.63 Vcc=3.3V for FSP2200-3.08/2.93 Vcc=3V for FSP2200-2.63 Vcc=2.5V for FSP2200-2.32 RESET Output Voltage High (push-pull active low) 0.8Vcc V Vcc-1.5 3/7 2007-2-8 3 PIN MICROPROCESSOR RESET MONITORS FSP2200 DETAILED DESCRIPTION A microprocessor's (MPU) reset input starts the MPU in a known state. The FSP2200 reset to prevent code execution errors during power-up, power-down, or brownout conditions. They assert a reset signal whenever the Vcc supply voltage declines below a preset thresh-old, keeping it asserted for at least 140ms after Vcc has risen above the reset threshold. The FSP2200 push-pull output stage. APPLICATION INFORMATION Negative-Going VCC Transients In addition to issuing a reset to the MPU during power-up, power-down, and brownout conditions, the FSP2200 is relatively immune to short-duration negative-going Vcc transients (glitches). Figure 1 shows typical transient duration vs. reset comparator overdrive, for which the FSP2200 do not generate a reset pulse. The graph was generated using a negative going pulse applied to Vcc, starting 0.5V above the actual reset threshold and ending below it by the magnitude in dicated (reset comparator overdrive). The graph indicates the maximum pulse width a negative-going Vcc transient can have without causing a reset pulse. As the magnitude of the transient increases (goes farther below the reset threshold), the maximum allowable pulse width decreases. Typically, for the FSP2200-4.63/4.38, a Vcc transient that goes 100mV below the reset threshold and lasts 20s or less will not cause a reset pulse. A 0.1F bypass capacitor mounted as close as possible to the VCC pin provides additional transient immunity. 400 320 240 160 80 0 1 10 100 1000 Reset Comparator Overdrive, VTH-Vcc Figure 1 Figure 2 Ensuring a Valid Reset Output: Down to VCC = 0 When VCC falls below 1V, the FSP2200 RESET output no longer sinks current-it becomes an open circuit. Therefore, high-impedance CMOS logic input connected to RESET can drift to undetermined voltages. This presents no problem in most applications since most MPU and other circuitry is inoperative with Vcc below 1V. However, in applications where RESET must be valid down to 0V, adding a pull-down resistor to RESET causes any stray leakage currents to flow to ground, holding RESET low Figure 2. R1's value is not critical, 100k is large enough not to load RESET and small enough to pull RESET to ground Benefits of Highly Accurate Reset Threshold Most MPU supervisor ICs have reset threshold voltages between 5% and 10% below the value of nominal supply voltages. This ensures a reset will not occur within 5% of the nominal supply, but will occur when the supply is 10% below nominal. When using ICs rated at only the nominal supply 5%, this leaves a zone of uncertainty where the supply is between 5% and 10% low, and where the reset may or may not be asserted. The FSP2200-4.63/3.08/2.32 use highly accurate circuitry to ensure that reset is asserted close to the 5% limit, and long before the supply has declined to 10% below nominal. 4/7 2007-2-8 3 PIN MICROPROCESSOR RESET MONITORS FSP2200 ORDERING INFORMATION FSP2200XXXX Packing: Package: C: SOT23-3L A:Tape & Reel U: SOT323-3L Temperature Grade: L: -40~105 E: -40~125 Threshold Voltage: Z: 2.32V R: 2.63V S: 2.93V T: 3.08V J: 4.00V M: 4.38V L: 4.63V MARKING INFORMATION 09X Threshold Voltage: L: 4.63V M: 4.38V J: 4.00V T: 3.08V S: 2.93V R: 2.63V Z: 2.32V Part Number: FSP2200 5/7 2007-2-8 3 PIN MICROPROCESSOR RESET MONITORS FSP2200 PACKAGE INFORMATION (1) SOT23-3L Symbol M1 M2 M3 M4 F5 F6 F7 H8 H9 Dimensions In Millimeters Min. Max. 2.8 3.0 0.35 0.5 1.3 1.7 1.7 2.1 0.6 2.05 2.75 0.1 1.0 1.4 0 0.15 Dimensions In Inches Min. Max. 0.112 0.120 0.014 0.020 0.052 0.068 0.068 0.084 0.024 0.082 0.110 0.004 0.040 0.056 0 0.006 6/7 2007-2-8 3 PIN MICROPROCESSOR RESET MONITORS FSP2200 (2) SOT323-3L Symbol M1 M2 M3 M4 M5 F6 F7 F8 H9 H10 H11 Dimensions In Millimeters Min. Max. 2.0 2.2 0.2 0.4 1.15 1.35 1.2 1.4 0.65 2.15 2.45 0.08 0.15 0.2 0.4 0.9 1.0 0 0.1 0.9 1.1 Dimensions In Inches Min. Max. 0.080 0.088 0.008 0.016 0.046 0.054 0.048 0.056 0.026 0.086 0.098 0.003 0.006 0.008 0.016 0.036 0.040 0 0.004 0.036 0.044 7/7 2007-2-8 |
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