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| DS1233M DS1233M EconoReset FEATURES PIN ASSIGNMENT restarts microprocessor after power DALLAS DS1233 Econo Reset RST VCC NC GND 1 2 3 4 8 7 6 5 NC NC NC NC * Automatically failure * Maintains reset for 350 ms after VCC returns to an in-tolerance condition * Reduces need for discrete components * Precision * Low-cost temperature-compensated voltage reference and voltage sensor TO-92 package or surface mount 8-pin SOIC packages available * Internal 5 K pull-up resistor * Compatible with Microprocessors Motorola 68XXX series and HC16 1 2 3 DS1233M 8-PIN SOIC (150 MIL) See Mech. Drawings Section 1 2 3 * Pin function compatible with the Motorola MC33064, MC34064, MC33164, and MC34164 * Operating temperature of -40C to +85C DS1233M TO-92 Package See Mech. Drawings Section PIN DESCRIPTIONS TO-92 1 2 3 RST VCC GND - Active Low Reset Output - Power Supply - Ground 8-Pin SOIC RST VCC NC GND - - - - Active Low Reset Output Power Supply No Connect Ground DESCRIPTION The DS1233M EconoReset uses a precision temperature compensated 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 (low) state. When VCC returns to an in-tolerance condition, the reset signal is kept in the active state for approximately 350 ms to allow the power supply and processor to stabilize. 022698 1/4 DS1233M OPERATION - POWER MONITOR The DS1233M 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, as defined by the tolerance of the part selected, the RST signal is asserted. On power-up, RST is kept active for approximately 350 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 Figure 1 VCC 5K RST Vcc TOLERANCE AND BIAS 350 ms DELAY T.C. REFERENCE GROUND APPLICATION EXAMPLE Figure 2 VCC DS1233M RST MICROPROCESSOR RESET 022698 2/4 DS1233M TIMING DIAGRAM: POWER UP Figure 3 tR VHTL VCCTP VLTL VCC tRPU VOH RST VOLTAGE TRIP LEVELS PARAMETER Voltage High Trip Level Voltage Low Trip Level Voltage High Trip Level Voltage Low Trip Level SYMBOL VHTL VLTL VHTL VLTL MIN TYP MAX 4.75 4.00 3.14 2.48 UNITS V V V V NOTES DS1233M-5, DS1233M-55 DS1233M-5, DS1233M-55 DS1233M-3 DS1233M-3 TIMING DIAGRAM: POWER DOWN Figure 4 VCC VHTL VCCTP VLTL tF RST tRPD VOL 022698 3/4 DS1233M ABSOLUTE MAXIMUM RATINGS* Voltage on VCC Pin Relative to Ground Voltage on I/O Relative to Ground Operating Temperature Storage Temperature Soldering Temperature -0.5V to +7.0V -0.5V to VCC + 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 1.2 TYP MAX 5.5 (-40C to +85C) UNITS V NOTES 1 DC ELECTRICAL CHARACTERISTICS PARAMETER Output Voltage @ -500 A Output Current @ 0.4V Operating Current VCC Trip Point (DS1233M-5) VCC Trip Point (DS1233M-55) VCC Trip Point (DS1233M-3) Output Capacitance Internal Pull-Up Resistor SYMBOL VOH IOL ICC VCCTP VCCTP VCCTP COUT RP 3.75 5 4.25 4.5 2.64 MIN VCC-0.5V +8 (-40C to +85C; VCC = 1.2V to 5.5V) TYP VCC-0.1V MAX UNITS V mA 50 4.375 4.625 2.72 4.49 4.75 2.8 10 6.50 A V V V pF K NOTES 1 2, 3 4 1 1 1 AC ELECTRICAL CHARACTERISTICS PARAMETER Reset Active Time VCC Detect to RST VCC Slew Rate (VHTL - VLTL) VCC Slew Rate (VLTL - VHTL) VCC detect to RST SYMBOL tRST tRPD tF tR tRPU 300 0 200 350 MIN 200 350 2 (-40C to +85C; VCC = 1.2V to 5.5V) TYP MAX 500 10 UNITS ms s s ns 500 ms 5 NOTES NOTES: 1. All voltages are referenced to ground. 2. Measured with VCC 2.7V. 3. A 1K external resistor may be required in some applications for proper operation of the microprocessor reset control circuit. 4. Measured with outputs open. 5. tR = 5 s. 022698 4/4 |
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