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| TS803R Microprocessor Reset Circuit Pin assignment TS803R 1. RESET 2. Gnd 3. Vcc Open Drain Threshold Voltage Option 2.7V, 2.93V, 4.2V General Description The TS803R are microprocessor (P) supervisory circuit used to monitor the power supplies in P 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 powered circuits. These circuits 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 with a variety of supply voltages are available. The TS803R are open -drain outputs. The TS803R have an active low RESET output, while the TS803R has an active high RESET output. The reset comparator is designed to ignore fast transients on VCC, and the output guaranteed to be in the correct logic state for VCC down to 1V. Low supply correct makes the TS803R ideal for use in portable equipment. The TS803R is available in a 3-pin SOT-23 package. Features Precision monitoring of +3V, +3.3V and +5V power supply voltage Fully specified over temperature Available in three output configurations Open - Drain RESET low output 3uA supply current Guaranteed reset valid to Vcc = +1V Power supply transient immunity No external components Ordering Information Part No. TS803RCX B TS803RCX E TS803RCX F Enable Function Active-Low Active-Low Active-Low Threshold Voltage 4.2V 2.93V 2.7V Package SOT-23 Note: x is the threshold voltage type, option as B: 4.20V E: 2.93V F: 2.70V Applications Computers Controllers Intelligent instruments Critical uP and uC power monitoring Portable / Battery powered equipment Automotive Pin Descriptions Pin No. 1 2 3 Name RESET Gnd Vcc Description Reset output pin (Active- Low) Ground Operating voltage input Absolute Maximum Rating Supply Voltage RESET & (RESET) push-pull Input Current, Vcc Output Current, RESET Rate of Rise, Vcc VCC VRESET ICC IO VR 7 - 0.3 ~ (VCC +0.3) 20 20 100 V V mA mA V/uS TS803R 1-1 2003/12 rev. E Recommended Operating Conditions Supply Voltage Operating Ambient Temperature Range Operating Junction Temperature Range Storage Temperature Range Thermal Resistance Power Dissipation Lead Soldering Temperature (260 C) o VCC Ta(op) Tj(op) TSTG jc PD TLEAD <5 -40 ~ +105 -40 ~ +125 -65 ~ +150 325 350 10 o V o o o C C C C /W mW S Electrical Characteristics Ta = 25 oC, unless otherwise specified. Parameter Input Supply Voltage Supply Current o Conditions Ta = 0 C ~ +70 C VCC Vth * 1.1 VCC Vth * 1.1, Ta = full range o Symbol VCC ICC Min 1.0 --- Typ ---- Max 5.5 3 5 Unit V uA Reset Threshold TS803RCXB TS803RCXE TS803RCXF VTH 0.985|VTH| 4.20 2.93 2.70 1.015|VTH| V Reset Threshold (Full temperature range) TS803RCXB TS803RCXE TS803RCXF VTH 0.97|VTH| 4.20 2.93 2.70 1.03|VTH| V Reset Threshold Temperature Coefficient VCC to Reset Delay Reset Active Timeout Period RESET Output Voltage Low RESET Output Voltage High VCC = VTH to (VTH - 100mV) Ta = 0 oC ~ +70 oC VCC < VTH(MIN), ISINK =1.2mA, VCC > VTH(MAX), ISOURCE =500uA VCC > 1.8V VCC > VTH(MAX), ISOURCE =150uA, 1.8V >= VCC > 1V Note 1 : The data based on VTH = 2.7V part type. VTH -- 30 -- ppm/ o C TDELAY -0.5 40 1.5 -- -5 0.5 uS mS V VOL -- VOH 0.8 VCC -- -- V TS803R 2-2 2003/12 rev. E Function Block Function Description Applications Circuit Timing Diagram Electrical Characteristics Curve TS803R 3-3 2003/12 rev. E Electrical Characteristics Curve TS803R 4-4 2003/12 rev. E SOT-23 Mechanical Drawing A B F DIM A B C D E SOT-23 DIMENSION MILLIMETERS INCHES MIN MAX MIN MAX 2.88 2.91 0.113 0.115 0.39 0.42 0.015 0.017 1.78 2.03 0.070 0.080 0.51 0.61 0.020 0.024 1.59 1.66 0.063 0.065 1.04 0.07 1.08 0.09 0.041 0.003 0.043 0.004 E G F G D C TS803R 5-5 2003/12 rev. E |
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