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| DS1815 3.3V EconoReset with Push-Pull Output www.dalsemi.com FEATURES Automatically restarts a microprocessor after power failure Maintains reset for 150 ms after VCC returns to an in-tolerance condition Reduces need for discrete components Precision temperature-compensated voltage reference and voltage sensor Accurate 5%, 10% or 20% power monitoring Low-cost TO-92 or space saving surfacemount SOT-23 packages available Push-pull output for low current operation Operating temperature -40C to +85C PIN ASSIGNMENT 3 1 2 SOT-23 PACKAGE 123 123 TO-92 PACKAGE See Mech. Drawings Section PIN DESCRIPTION TO-92 1 2 3 RST VCC GND Active Low Reset Output Power Supply Ground SOT-23 1 2 3 RST VCC GND Active Low Reset Output Power Supply Ground DESCRIPTION The DS1815 EconoReset uses a precision temperature reference and comparator circuit to monitor the status of the power supply (VCC). When an out-of-tolerance condition is detected, an internal power-fail signal is generated which forces reset to the active state. When VCC returns to an in-tolerance condition, the reset signal is kept in the active state for approximately 150 ms to allow the power supply and processor to stabilize. 1 of 5 111999 DS1815 OPERATION - POWER MONITOR The DS1815 provides the functions of detecting out-of-tolerance power supply conditions and warning a processor-based system of impending power failure. When VCC is detected as out of tolerance, the RST signal is asserted. On power-up, RST is kept active for approximately 150 ms after the power supply has reached the selected tolerance. This allows the power supply and microprocessor to stabilize before RST is released. BLOCK DIAGRAM (CMOS OUTPUT) Figure 1 APPLICATION EXAMPLE Figure 2 APPLICATION DIAGRAM: RST VALID TO 0 VOLTS VCC ON THE DS1815 Figure 3 2 of 5 DS1815 TIMING DIAGRAM: POWER-UP Figure 4 TIMING DIAGRAM: POWER-DOWN Figure 5 3 of 5 DS1815 ABSOLUTE MAXIMUM RATINGS* Voltage on VCC Pin Relative to Ground Voltage on RST Relative to Ground Operating Temperature Storage Temperature Soldering Temperature * -0.5V to +7.0V -0.5V to +5VCC +0.5V -40C to +85C -55C to +125C 260C for 10 seconds 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 PARAMETER Supply Voltage SYMBOL VCC MIN 0.0 TYP MAX 5.5 (-40C to +85C) UNITS V NOTES 1 DC ELECTRICAL CHARACTERISTICS PARAMETER Output Voltage @ -500 A Output Current @ 2.4 V Output Current @ 0.4 V Operating Current VCC < 5.5 VCC Trip Point (DS1815-5) VCC Trip Point (DS1815-10) VCC Trip Point (DS1815-15) Output Capacitance SYMBOL VOH IOH IOL ICC VCCTP VCCTP VCCTP COUT (-40C to +85C; VCC=1.2V to 5.5V) MIN VCC -0.5V +10 28 2.98 2.80 2.47 3.06 2.88 2.55 35 3.15 2.97 2.64 10 TYP VCC -0.1V 350 MAX UNITS V A mA A V V V pF NOTES 1 2 2 3 1 1 1 AC ELECTRICAL CHARACTERISTICS PARAMETER RESET Active Time VCC Detect to RST VCC Slew Rate (VCCTP (MAX) to VCCTP (MIN)) VCC Slew Rate (VCCTP (MIN) to VCCTP (MAX)) VCC Detect to RST SYMBOL tRST tRPD tF tR tRPU (-40C to +85C; VCC=1.2V to 5.5V) MIN 100 300 0 100 150 250 TYP 150 2 MAX 250 5 UNITS ms s s ns ms 4, 5 6 NOTES 4 4 of 5 DS1815 NOTES: 1. All voltages are referenced to ground. 2. Measured with VCC 2.7V. 3. Measured with RST output open. 4. Measured with 2.7V VCC 3.3V. 5. tR = 5 s. 6. The tF value is for reference 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", &"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. A . . . . . . 5% B . . . . . . 10% C . . . . . . 15% D . . . . . . 20% 5 of 5 |
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