DS1813 MAXIM | Alldatasheet
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Technical content
1 of 5 REV: 022306 GENERAL DESCRIPTION The DS1813 EconoReset uses a precision temperature reference and comparator circuit to monitor the status of the power supply (V CC). When an out-of-tolerance condition is detected, an internal power-fail signal is generated which forces reset to the active state. When V CC returns to an in-tolerance conditi on, the reset signal is kept in the active stat e for approximately 150ms to allow the power s upply and processor to stabilize. The DS1813 also monitors a pushbutton on the reset output. If the reset line is pulled low, a reset is generated upon release and will be held in reset output low for typically 150ms.
FEATURES
Automatically Restarts a Microprocessor After Power Failure Monitors Pushbutton for External Override Maintains Reset for Typically 150ms After VCC Returns to an In-Tolerance Condition Reduces Need for Discrete Components Precision Temperature-Compensated Voltage Reference and Voltage Sensor Low-Cost TO-92 or Space-Saving Surface- Mount SOT-23 Packages Available Efficient Open-Drain Output with Internal 5.5kΩ Pullup Resistor -40°C to +85°C Operating Temperature PIN CONFIGURATIONS PIN DESCRIPTION PIN TO-92 SOT-23 NAME FUNCTION 1 1 RST Active-Low Reset Output 2 2 V CC Power Supply 3 3 GND Ground DS1813 5V EconoReset with Pushbutton www.maxim-ic.com TOP VIEW SOT-23 PACKAGE See Mech. Drawings Section On Website1 2 3 1 2 3 BOTTOM VIEW TO-92 PACKAGE See Mech. Drawings Section On Website DALLAS DS1813 Econo Reset
This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. RECOMMENDED DC OPERATING CONDITIONS (TA = -40°C to +85°C) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES Supply Voltage V CC 0 5.5 V 1 DC ELECTRICAL CHARACTERISTICS (VCC = 1.2V to 5.5V, TA = -40°C to +85°C.) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES Output Current at 0.4V I OL 10 mA 2, 3 Voltage Input Low V IL 0.4 V 1 Voltage Input High V IH 0.7 x VCC V 1 Operating Current VCC < 5.5 I CC 30 40 µA 4 DS1813-5 4.50 4.62 4.75 DS1813-10 4.25 4.35 4.49 VCC Trip Point DS1813-15 VCCTP 4.00 4.13 4.24 V 1 Internal Pullup Resistor R P 3.50 5.5 7.5 kΩ 6 Output Capacitance C OUT 10 pF AC ELECTRICAL CHARACTERISTICS (VCC = 1.2V to 5.5V, TA = -40°C to +85°C.) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES Reset Active Time t RST 100 150 300 ms VCC Detect to RST tRPD 2 5 µs VCC Slew Rate (VCCTP(MAX) - VCCTP(MIN)) tF 300 µs 7 VCC Slew Rate (VCCTP(MIN) - VCCTP(MAX)) tR 0 ns VCC Detect to RST t RPU 100 150 300 ms 5 Pushbutton Detect to RST tPB 1 µs Pushbutton Reset t PBRST 100 150 300 ms
Maxim/Dallas Semiconductor cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim/Dallas Semiconductor product. No circuit patent licenses are implied. Maxim/Dallas Semiconductor reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2006 Maxim Integrated Products • Printed USA The Maxim logo is a registered trademark of Maxim Integrated Products, Inc. The Dallas logo is a registered trademark of Dallas Semiconductor Corporation. NOTES: 1) All voltages are referenced to ground. 2) Measured with V CC ≥ 2.7V. 3) A 1k Ω external resistor may be required in some applications for proper operation of the microprocessor reset control circuit. 4) Measured with RST output open. 5) t R = 5µs. 6) V OH and IOH are a function of the value of RP and the associated output load conditions. 7) This value is for referenc e in defining values for tRPD and should not be considered a requirement for proper operation or use of the device. PART MARKING CODES “A,” “B,” and “C” represent the device type. 810 . . . . DS1810 811 . . . . DS1811 812 . . . . DS1812 813 . . . . DS1813 815 . . . . DS1815 816 . . . . DS1816 817 . . . . DS1817 818 . . . . DS1818 “D” represents the device tolerance.