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DS1233D 5V EconoReset
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FEATURES
Automatically restarts microprocessor after power failure Maintains reset for 350 ms after VCC returns to an in-tolerance condition Accurate 5%, 10% or 15% microprocessor 5V power supply monitoring Reduces need for discrete components Precision temperature-compensated voltage reference and voltage sensor Low-cost TO-92 package or surface mount SOT-223 package Internal 5 k pull-up resistor Compatible with Motorola 68XXX series and HC16 Microprocessors Operating temperature of -40C to +85C
PIN ASSIGNMENT
DALLAS DS1233 Econo Reset
1 123
123 TO-92 PACKAGE See Mech. Drawings Section 243 SOT-223 PACKAGE See Mech. Drawings Section
PIN DESCRIPTION
PIN 1 PIN 2 PIN 3 PIN 4 GROUND
RESET
VCC GROUND (SOT-223 ONLY)
DESCRIPTION
The DS1233D 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 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.
OPERATION - POWER MONITOR
The DS1233D 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.
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111899
DS1233D
BLOCK DIAGRAM Figure 1
APPLICATION EXAMPLE Figure 2
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DS1233D
POWER UP Figure 3
POWER DOWN Figure 4
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DS1233D
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 5.0 MAX 5.5
(-40C to +85C)
UNITS V NOTES 1
DC ELECTRICAL CHARACTERISTICS
PARAMETER Low Level @ RST Output Current @ 0.4V Operating Current VCC Trip Point 5% VCC Trip Point 10% VCC Trip Point 15% Output Capacitance Internal Pull-Up Resistor SYMBOL VOL IOL ICC VCCTP1 VCCTP2 VCCTP3 COUT RP 4.5
(-40C to +85C; VDD=5V 10%)
MIN +8 50 4.625 4.375 4.125 5 4.74 4.49 4.24 10 3.75 6.25 4.25 4.0 TYP MAX 0.4 UNITS V mA A V V V pF k 1 1 1 NOTES 1 2
AC ELECTRICAL CHARACTERISTICS
PARAMETER Reset Active Time VCC Detect to RST VCC Slew Rate (4.75V - 4.00V) VCC Slew Rate (4.00V - 4.75V) VCC Detect to RST SYMBOL tRST tRPD tF tR tRPU
(-40C to +85C; VCC=5V 10%)
MIN 250 300 0 250 350 450 TYP 350 MAX 450 100 UNITS ms ns s ns ms NOTES
NOTES:
1. All voltages are referenced to ground. 2. A 1 k external resistor may be required for proper operation of the microprocessor reset control circuit.
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DS1233D
ECONORESET SELECTION GUIDE
VCC TRIP POINT MIN DS1233-15 DS1233-10 DS1233-5 DS1233D-15 5V DS1233D-10 DS1233D-5 DS1833-15 DS1833-10 DS1833-5 3.3V DS1233A-15 DS1233A-10 4.0 4.25 4.5 4.0 4.25 4.5 4.0 4.25 4.5 2.64 2.8 TYP 4.125 4.375 4.625 4.125 4.375 4.625 4.125 4.375 4.625 2.72 2.88 MAX 4.24 4.49 4.75 4.24 4.49 4.75 4.24 4.49 4.75 2.80 2.97 PUSHBUTTON DETECT MIN 2.4 2.4 2.4 N/A N/A N/A N/A N/A N/A 1.8 1.8 TYP MAX 3.3 3.3 3.3 N/A N/A N/A N/A N/A N/A 3.0 3.0
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