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 (µP) supervisory circuit used to monitor the power supplies in µP 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 Ordering Information Precision monitoring of +3V, +3.3V and +5V Part No. power supply voltage Enable Function Threshold Voltage Fully specified over temperature TS803RCX B Active-Low 4.2V Available in three output configurations TS803RCX E Active-Low 2.93V TS803RCX F Active-Low 2.7V Open – Drain RESET low output 3uA supply current Package SOT-23 Note: x is the threshold voltage type, option as B: 4.20V E: 2.93V F: 2.70V Guaranteed reset valid to Vcc = +1V Power supply transient immunity No external components Applications Pin Descriptions Computers Controllers Intelligent instruments Pin No. Name Description 1 RESET Reset output pin (Active- Low) Critical uP and uC power monitoring Portable / Battery powered equipment 2 Gnd Ground Automotive 3 Vcc Operating voltage input Absolute Maximum Rating Supply Voltage VCC 7 V VRESET - 0.3 ~ (VCC +0.3) V Input Current, Vcc ICC 20 mA Output Current, RESET IO 20 mA Rate of Rise, Vcc VR 100 V/uS RESET & (RESET) push-pull TS803R 1-1 2003/12 rev. E Recommended Operating Conditions Supply Voltage VCC <5 Ta(op) -40 ~ +105 o C Tj(op) -40 ~ +125 o C Storage Temperature Range TSTG -65 ~ +150 o C Thermal Resistance Θjc 325 PD 350 mW TLEAD 10 S Operating Ambient Temperature Range Operating Junction Temperature Range Power Dissipation o Lead Soldering Temperature (260 C) V o C /W Electrical Characteristics Ta = 25 oC, unless otherwise specified. Parameter Conditions o o Symbol Min Typ Max Unit Input Supply Voltage Ta = 0 C ~ +70 C VCC 1.0 -- 5.5 V Supply Current VCC ≤ Vth * 1.1 ICC -- -- 3 uA -- -- 5 0.985|VTH| 4.20 1.015|VTH| VCC ≤ Vth * 1.1, Ta = full range Reset Threshold TS803RCXB VTH TS803RCXE 2.93 TS803RCXF 2.70 Reset Threshold TS803RCXB VTH (Full temperature range) TS803RCXE 2.93 TS803RCXF 2.70 Reset Threshold VTH 0.97|VTH| -- 4.20 V 1.03|VTH| 30 V -- o Temperature Coefficient VCC to Reset Delay VCC = VTH to (VTH - 100mV) Reset Active Timeout Period Ta = 0 oC ~ +70 oC RESET Output Voltage Low VCC < VTH(MIN), ISINK =1.2mA, RESET Output Voltage High VCC > VTH(MAX), ISOURCE =500uA TDELAY 40 -- uS 0.5 1.5 5 mS VOL -- -- 0.5 V VOH 0.8 VCC -- -- V VCC > VTH(MAX), ISOURCE =150uA, 1.8V >= VCC > 1V Note 1 : The data based on VTH = 2.7V part type. 2-2 C -- VCC > 1.8V TS803R ppm/ 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 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 F G 1.04 0.07 DIM E G D TS803R 1.08 0.09 0.041 0.003 C 5-5 2003/12 rev. E 0.043 0.004