DS1232LP/LPS Low Power MicroMonitor Chip
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1 DS1232LP/LPS Low Power MicroMonitor Chip FEATURES Super-low power version of DS µa quiescent current Halts and restarts an out-of-control microprocessor Automatically restarts microprocessor after power failure Monitors pushbutton for external override Accurate 5% or 10% microprocessor power supply monitoring 8-pin DIP, 8-pin SOIC or space saving µ-sop package available Optional 16-pin SOIC package available Industrial temperature -40 C to +85 C available, designated N PIN ASSIGNMENT PB TD TOL GND V CC ST DS1232LP 8-Pin DIP (300-mil) See Mech. Drawings Section PB TD TOL GND V CC ST DS1232LPµ (118-mil µ-sop) See Mech. Drawings Section PB TD TOL GND VCC ST DS1232LPS 16-Pin SOIC (300-mil) See Mech. Drawings Section PB TD TOL GND VCC 7 ST 6 5 DS1232LPS-2 8-Pin SOIC (150-mil) See Mech. Drawings Section PIN DESCRIPTION PB TD TOL GND ST V CC - Pushbutton Reset Input - Time Delay Set - Selects 5% or 10% V CC Detect - Ground - Reset Output (Active High) - Reset Output (Active Low, open drain) - Strobe Input - +5 Volt Power DESCRIPTION The DS1232LP/LPS Low Power MicroMonitor Chip monitors three vital conditions for a microprocessor: power supply, software execution, and external over-ride. First, a precision temperaturecompensated reference and comparator circuit monitors the status of V CC. When an out-of-tolerance condition occurs, an internal power-fail signal is generated which forces reset to the active state. When V CC returns to an in-tolerance condition, the reset signals are kept in the active state for a minimum of 250 ms to allow the power supply and processor to stabilize. 1 of
2 DS1232LP/LPS The second function the DS1232LP/LPS performs is pushbutton reset control. The DS1232LP/LPS debounces the pushbutton input and guarantees an active reset pulse width of 250 ms minimum. The third function is a watchdog timer. The DS1232LP/LPS has an internal timer that forces the reset signals to the active state if the strobe input is not driven low prior to timeout. The watchdog timer function can be set to operate on timeout settings of approximately 150 ms, 600 ms, and 1.2 seconds. OPERATION - POWER MONITOR The DS1232LP/LPS detects out-of-tolerance power supply conditions and warns a processor-based system of impending power failure. When V CC falls below a preset level as defined by TOL, the V CC comparator outputs the signals and. When TOL is connected to ground, the and signals become active as V CC falls below 4.75 volts. When TOL is connected to V CC, the and signals become active as V CC falls below 4.5 volts. The and are excellent control signals for a microprocessor, as processing is stopped at the last possible moments of valid V CC. On power-up, and are kept active for a minimum of 250 ms to allow the power supply and processor to stabilize. OPERATION - PUSHBUTTON RESET The DS1232LP/LPS provides an input pin for direct connection to a pushbutton (Figure 1). The pushbutton reset input requires an active low signal. Internally, this input is debounced and timed such that and signals of at least 250 ms minimum are generated. The 250 ms delay starts as the pushbutton reset input is released from low level. OPERATION - WATCHDOG TIMER The watchdog timer function forces and signals to the active state when the ST input is not stimulated for a predetermined time period. The time period is set by the TD input to be typically 150 ms with TD connected to ground, 600 ms with TD left unconnected, and 1.2 seconds with TD connected to V CC. The watchdog timer starts timing out from the set time period as soon as and are inactive. If a high-to-low transition occurs on the ST input pin prior to timeout, the watchdog timer is reset and begins to timeout again. If the watchdog timer is allowed to timeout, then the and signals are driven to the active state for 250 ms minimum. The ST input can be derived from microprocessor address signals, data signals, and/or control signals. When the microprocessor is functioning normally, these signals would, as a matter of routine, cause the watchdog to be reset prior to timeout. To guarantee that the watchdog timer does not timeout, a high-to-low transition must occur at or less than the minimum shown in Table 1. A typical circuit example is shown in Figure 2. 2 of 7
3 MICROMONITOR BLOCK DIAGRAM DS1232LP/LPS PUSHBUTTON RESET Figure 1 WATCHDOG TIMER Figure 2 3 of 7
4 TIMING DIAGRAM: PUSHBUTTON RESET Figure 3 DS1232LP/LPS TIMING DIAGRAM: STROBE INPUT Figure 4 WATCHDOG TIME-OUTS Table 1 TIME-OUT TD MIN TYP MAX GND 62.5 ms 150 ms 250 ms Float 250 ms 600 ms 1000 ms V CC 500 ms 1200 ms 2000 ms 4 of 7
5 TIMING DIAGRAM: POWER-DOWN Figure 5 DS1232LP/LPS TIMING DIAGRAM: POWER-UP Figure 6 5 of 7
6 ABSOLUTE MAXIMUM RATINGS* Voltage on V CC Pin Relative to Ground -0.5V to +7.0V Voltage on I/O Relative to Ground -0.5V to V CC + 0.5V Operating Temperature 0 C to 70 C Operating Temperature (Industrial Version) -40 C to +85 C Storage Temperature -55 C to +125 C Soldering Temperature 260 C for 10 seconds DS1232LP/LPS * 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 (0 C to 70 C) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES Supply Voltage V CC V 1 ST and PB Input High Level V IH 2.0 V CC +0.3 V 1 ST and PB Input Low Level V IL V 1 DC ELECTRICAL CHARACTERISTICS (0 C to 70 C; V CC =4.5 to 5.5V) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES Input Leakage I IL µa 3 Output 2.4V I OH ma 5 Output 0.4V I OL 10 ma Low V OL 0.4 V 1 Output -500 ua V OH V CC -0.5V V CC -0.1V V 1, 7 Output Current (CMOS) I CC1 50 µa 2 Operating Current (TTL) I CC µa 8 V CC Trip Point (TOL=GND) V CCTP V 1 V CC Trip Point (TOL=V CC ) V CCTP V 1 CAPACITAE (t A =25 C) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES Input Capacitance C IN 5 pf Output Capacitance C OUT 7 pf 6 of 7
7 DS1232LP/LPS AC ELECTRICAL CHARACTERISTICS (0 C to 70 C; V CC =5V ± 10%) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES PB = V IL t PB 20 ms RESET Active Time t ms ST Pulse Width t ST 20 ns 6, 9 V CC Fail Detect to and t RPD µs V CC Slew Rate 4.75V to 4.25V t F 300 µs V CC Detect to and Inactive t RPU ms 4 V CC Slew Rate 4.25V to 4.75V t R 0 ns PB Stable Low to and t PDLY 20 ms NOTES: 1. All voltages referenced to ground. 2. Measured with outputs open and ST and PB within 0.5V of supply rails. 3. PB is internally pulled up to V CC with an internal impedance of 40k typical. 4. t R = 5 µs. 5. is an open-drain output. 6. Must not exceed t TD minimum. See Table remains within 0.5V of V CC on power-down until V CC drops below 2.0V. remains within 0.5V of GND on power-down until V CC drops below 2.0V. 8. Measured with outputs open and ST and PB at TTL levels. 9. Watchdog can not be disabled. It must be strobed to avoid resets. MARKING INFORMATION: 8-pin DIP - DS1232L 16-pin SOIC - DS1232L 8-pin SOIC - DS1232L 8-pin µ-sop of 7
8 ENGLISH?????????? WHAT'S NEW PRODUCTS SOLUTIONS DESIGN APPNOTES SUPPORT BUY COMPANY MEMBERS DS1232LP Part Number Table Notes: See the DS1232LP QuickView Data Sheet for further information on this product family or download the DS1232LP full data sheet (PDF, 112kB). Other options and links for purchasing parts are listed at: Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: See full data sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Part Number Notes Free Sample Buy Direct Package: TYPE PINS SIZE DRAWING CODE/VAR * Temp RoHS/Lead-Free? DS1232LP DS1232LP+ DS1232LPN+ DS1232LPN PDIP;8 pin;300 Dwg: 56-G A (PDF) Use pkgcode/variation: P8-1* PDIP;8 pin;300 Dwg: 56-G A (PDF) Use pkgcode/variation: P8+1* PDIP;8 pin;300 Dwg: 56-G A (PDF) Use pkgcode/variation: P8+1* PDIP;8 pin;300 Dwg: 56-G A (PDF) Use pkgcode/variation: P8-1* -40C to +85C -40C to +85C DS1232LPS-2/T&R/C02 DS1232LPS-2/T&R/C01 DS1232LPS-2/TR+C01 Use pkgcode/variation: S8+2* DS1232LPS/T&R/ Use pkgcode/variation: W16-11*
9 DS1232LPSN+T&R DS1232LPS+ DS1232LPS DS1232LPS+T&R DS1232LPS/T&R DS1232LPSN+ DS1232LPSN DS1232LPSN/T&R DS1232LPS-2/T&R DS1232LPS-2+T&R DS1232LPS /Reel 1000/Reel 1000/Reel 2500/Reel 2500/Reel Use pkgcode/variation: W16+11* Use pkgcode/variation: W16+11* Use pkgcode/variation: W16-11* Use pkgcode/variation: W16+11* Use pkgcode/variation: W16-11* Use pkgcode/variation: W16+11* Use pkgcode/variation: W16-11* Use pkgcode/variation: W16-11* Use pkgcode/variation: S8-2* Use pkgcode/variation: S8+2* Use pkgcode/variation: S8-2* DS1232LPS-2+ Lead-Free Use pkgcode/variation: S8+2* DS1232LPSN-2+ DS1232LPSN-2+T&R DS1232LPSN-2/T&R DS1232LPSN /Reel 2500/Reel Use pkgcode/variation: S8+2* Use pkgcode/variation: S8+2* Use pkgcode/variation: S8-2* Use pkgcode/variation: S8-2* -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C
10 DS1232LPU+ usop;8 pin;118 Dwg: J (PDF) Use pkgcode/variation: U8+1* DS1232LPU usop;8 pin;118 Dwg: J (PDF) Use pkgcode/variation: U8-1* DS1232LPU+T&R 3000/Reel usop;8 pin;118 Dwg: J (PDF) Use pkgcode/variation: U8+1* -40C to +85C DS1232LPU/T&R 3000/Reel usop;8 pin;118 Dwg: J (PDF) Use pkgcode/variation: U8-1* -40C to +85C Didn't Find What You Need? CONTACT US: SEND US AN C opyright 2007 by Maxim Integrated Products, Dallas Semiconductor Legal Notices P rivacy P olicy
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3.0V/3.3V Microprocessor Supervisory Circuits MAX690T/S/R, MAX704T/S/R, MAX802T/S/R, MAX804 MAX806T/S/R. Features
, MAX804 General Description These microprocessor (µp) supervisory circuits reduce the complexity and number of components required for power-supply monitoring and battery-control functions in µp systems.
PI3C3126. Description. Features. 14-Pin Configuration. Applications. Block Diagram. 16-Pin Configuration. Truth Table (1) Pin Description.
2./3.3, High Bandwidth, Hot Insertion,4-Bit, 2-Port Bus Switch with Individual Enables Features Near-Zero propagation delay -ohm switches connect inputs to outputs High Bandwidth (>400 MHz) 2./3.3 Supply
Setup Period. General Description
General Description The MAX6443 MAX6452 low-current microprocessor reset circuits feature single or dual manual reset inputs with an extended setup period. Because of the extended setup period, short switch
Low Cost Microprocessor Supervisory Circuits ADM705/ADM706/ADM707/ADM708
Low Cost Microprocessor Supervisory Circuits ADM705/ADM706/ADM707/ADM708 FEATURES Guaranteed valid with VCC = V 90 μa quiescent current Precision supply voltage monitor 4.65 V (ADM705/ADM707) 4.40 V (ADM706/ADM708)
PT7M1818/1813 Supervisory Circuit
Features Highly accurate: 1.5% (25 C) Accurate power monitoring: 2.5V, 2.9V, 3. (PT7M1818), and 4.1, 4.3, 4.6V (PT7M1813) Operating voltage range: 1. ~ 5.5V Operating temperature range: -40 C to + 85 C
FST Bit Low Power Bus Switch
2-Bit Low Power Bus Switch General Description The FST3306 is a 2-bit ultra high-speed CMOS FET bus switch with TTL-compatible active LOW control inputs. The low on resistance of the switch allows inputs
PI3C V/3.3V, High Bandwidth, Hot Insertion 8-Bit, 2-Port, Bus Switch. Description. Features. Pin Configuration. Block Diagram.
Features Near-Zero propagation delay 5-ohm switches connect inputs to outputs High Bandwidth Operation (>400 MHz) Permits Hot Insertion 5V I/O Tolerant Rail-to-Rail 3.3V or 2.5V Switching 2.5V Supply Voltage
Low Cost Microprocessor Supervisory Circuits ADM705/ADM706/ADM707/ADM708
Low Cost Microprocessor Supervisory Circuits ADM705/ADM706/ADM707/ADM708 FEATURES Guaranteed valid with VCC = V 90 μa quiescent current Precision supply voltage monitor 4.65 V (ADM705/ADM707) 4.40 V (ADM706/ADM708)
IMP705/6/7/8, 813L8. atchdog timer Brownout detection. ection supply y monitor POWER MANAGEMENT. Key Features. Applications.
POWER MANAGEMENT Low-P -Power µp P Supervisor Circuits WatcW atchdog timer Brownout detection ection Power P supply y monitor or The IMP0/0/0/0 and IMPL CMOS supervisor circuits monitor power-supply and
DS1720 ECON-Digital Thermometer and Thermostat
www.maxim-ic.com FEATURES Requires no external components Supply voltage range covers from 2.7V to 5.5V Measures temperatures from 55 C to +125 C in 0.5 C increments. Fahrenheit equivalent is 67 F to +257
DS1866 Log Trimmer Potentiometer
og Trimmer Potentiometer www.dalsemi.com FEATURES Single 8-position og Trimmer Potentiometer -db/step Operates from 2.7V to.v supplies Parallel interface control: P0, P1, P2 Standard Resistance Value:
DS1075. EconOscillator/Divider PRELIMINARY FEATURES PIN ASSIGNMENT FREQUENCY OPTIONS
PRELIMINARY EconOscillator/Divider FEATURES Dual Fixed frequency outputs (200 KHz 100 MHz) User programmable on chip dividers (from 1 513) User programmable on chip prescaler (1, 2, 4) No external components
DM96S02 Dual Retriggerable Resettable Monostable Multivibrator
January 1992 Revised June 1999 DM96S02 Dual Retriggerable Resettable Monostable Multivibrator General Description The DM96S02 is a dual retriggerable and resettable monostable multivibrator. This one-shot
DS1073 3V EconOscillator/Divider
3V EconOscillator/Divider wwwmaxim-iccom FEATURES Dual fixed-frequency outputs (30kHz to 100MHz) User-programmable on-chip dividers (from 1 to 513) User-programmable on-chip prescaler (1, 2, 4) No external
Features. Ordering Information VCC MIC8114 RESET
MIC8114 Microprocessor Reset Circuit General Description The MIC8114 is an inexpensive microprocessor supervisory circuit that monitors the power supply in microprocessor based systems. The function of
ILX485. Low-Power, RS-485/RS-422 Transceivers TECHNICAL DATA
TECHNICAL DATA Low-Power, RS-485/RS-422 Transceivers ILX485 Description The ILX485 is low-power transceivers for RS-485 and RS- 422 communication. IC contains one driver and one receiver. The driver slew
3 V, Voltage Monitoring Microprocessor Supervisory Circuits
3 V, Voltage Monitoring Microprocessor Supervisory Circuits ADM706P/ADM706R/ADM706S/ADM706T, ADM708R/ADM708S/ADM708T FEATURES Precision supply voltage monitor 2.63 V (ADM706P, ADM706R, ADM708R) 2.93 V
DS1868B Dual Digital Potentiometer
www. maximintegrated.com FEATURES Two digitally controlled, 256-position potentiometers Serial port provides means for setting and reading both potentiometers Resistors can be connected in series to provide
High Speed Super Low Power SRAM CS18LV Revision History. 8K-Word By 8 Bit
Revision History Rev. No. History Issue Date Remark 1.0 Initial Issue Dec.17,2004 1.1 Update the WRITE CYCLE1 (Write Enable Controlled) waveform Mar.29,2005 1 GENERAL DESCRIPTION The is a high performance,
μp Supervisors Benefits and Features General Description Typical Operating Circuit Applications
Click here for production status of specific part numbers. MAX16000 MAX16007 General Description The MAX16000 MAX16007 are low-voltage, quad/hex/ octal-voltage μp supervisors in small TQFN and TSSOP packages.
Introduction. Features. Applications
70-70/70P-707-70-70T/S/R-L Features Precision supply-voltage monitor -.V (70L/70, L, 70L/707) -.V (70M/70, M, 70M/70) -.0V (70T, T, 70T) -.9V (70S, S, 70S) -.V (70R, R/70P, 70R) -.V (70Z, Z, 70Z) -.0V
Supervisory Circuits with Watchdog and Manual Reset in 5-Lead SC70 and SOT-23 ADM823/ADM824/ADM825
Data Sheet Supervisory Circuits with Watchdog and Manual Reset in 5-Lead SC70 and SOT-23 ADM823/ADM824/ADM825 FEATURES FUNCTIONAL BLOCK DIAGRAM Precision 2.5 V to 5 V power supply monitor 7 reset threshold
CD4538 Dual Precision Monostable
CD4538 Dual Precision Monostable General Description The CD4538BC is a dual, precision monostable multivibrator with independent trigger and reset controls. The device is retriggerable and resettable,
PART TEMP RANGE PIN-PACKAGE SPEED
Rev 0; 8/06 General Description The is a 16Mb reflowable nonvolatile (NV) SRAM, which consists of a static RAM (SRAM), an NV controller, and an internal rechargeable manganese lithium (ML) battery. These
256K (32K x 8) OTP EPROM AT27C256R
Features Fast Read Access Time 45 ns Low-Power CMOS Operation 100 µa Max Standby 20 ma Max Active at 5 MHz JEDEC Standard Packages 28-lead PDIP 32-lead PLCC 28-lead TSOP and SOIC 5V ± 10% Supply High Reliability
MAX705 MAX708/MAX813L Low-Cost, µp Supervisory Circuits
MAX0 MAX0/MAXL General Description The MAX0-MAX0/MAXL microprocessor (µp) supervisory circuits reduce the complexity and number of components required to monitor power-supply and battery functions in µp
DS1090 OUTPUT FREQUENCY RANGE PIN- PACKAGE PART PRESCALER
Rev ; / PART OUTPUT FREQUENCY RANGE PRESCALER * PIN- PACKAGE U-1 MHz to MHz 1 µsop U-2* 2MHz to MHz 2 µsop U-* 1MHz to 2MHz µsop U-* 5kHz to 1MHz µsop U-16 U-32* 25kHz to 5kHz 125kHz to 25kHz 16 µsop 32
DM74ALS174 DM74ALS175 Hex/Quad D-Type Flip-Flops with Clear
Hex/Quad D-Type Flip-Flops with Clear General Description These positive-edge-triggered flip-flops utilize TTL circuitry to implement D-type flip-flop logic. Both have an asynchronous clear input, and