MAX704

MAX690T_05 MAXIM | Alldatasheet

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These microprocessor (µP) supervisory circuits reduce the complexity and number of components required for power-supply monitoring and battery-control functions in µP systems. They significantly improve system relia- bility and accuracy compared to separate ICs or discrete components. These devices are designed for use in systems powered by 3.0V or 3.3V supplies. See the selector guide in the back of this data sheet for similar devices designed for 5V systems. The suffixes denote different reset threshold voltages: 3.075V (T), 2.925V (S), and 2.625V (R) (see the Reset Threshold section in the Detailed Description). All these parts are available in 8-pin DIP and SO packages. Functions offered in this series are as follows: Battery-Powered Computers and Controllers Embedded Controllers Intelligent Instruments Automotive Systems Critical µP Power Monitoring Portable Equipment ♦ Manual Reset Input ♦ Precision Supply-Voltage Monitor ♦ 200ms Reset Time Delay ♦ Watchdog Timer (1.6s timeout) ♦ Battery-Backup Power Switching— Battery Can Exceed VCC in Normal Operation ♦ 40µA VCC Supply Current ♦ 1µA Battery Supply Current ♦ Voltage Monitor for Power-Fail or Low-Battery Warning ♦ Guaranteed –R—E—S—E—T– Assertion to VCC = 1V ♦ 8-Pin DIP and SO Packages MAX690T/S/R, 704T/S/R, 802T/S/R, 804–806T/S/R 3.0V/3.3V Microprocessor Supervisory Circuits MAX690T/S/R MAX802T/S/R MAX804T/S/R MAX805T/S/R 0.1μF VOUT RESET (RESET) PFO WDI VBATT VCC GND GND GND VCC 0.1μF 0.1μF 3.6V LITHIUM BATTERY CMOS RAM μPVCC RESET NMI I/O LINE UNREGULATED DC REGULATED +3.3V OR +3.0V R2 BUS ( ) ARE FOR MAX804T/S/R, MAX805T/S/R PFI See last page for MAX704T/S/R, MAX806T/S/R. DIP/SO TOP VIEW PFO VBATT RESET (RESET) WDI <MR> VOUT VCC GND PFI MAX690T/S/R MAX704T/S/R MAX802T/S/R MAX804T/S/R MAX805T/S/R MAX806T/S/R ( ) ARE FOR MAX804T/S/R, MAX805T/S/R < > ARE FOR MAX704T/S/R, MAX806T/S/R 19-0243; Rev 2; 12/05 PART** TEMP RANGE MAX690_CPA 0°C to +70°C MAX690_CSA 0°C to +70°C MAX690_C/D 0°C to +70°C Dice* 8 SO

8 Plastic DIP

MAX690_EPA -40°C to +85°C MAX690_ESA -40°C to +85°C MAX690_MJA -55°C to +125°C 8 CERDIP 8 SO Active-Low Reset Active-High ResetWatchdog Input Manual Reset Input Backup-Battery Switch Power-Fail Threshold Accuracy Power-Fail Comparator Reset Window Ordering Information continued at end of data sheet. *Contact factory for dice specifications. **These parts offer a choice of reset threshold voltage. Select the letter corresponding to the desired nominal reset threshold voltage (T = 3.075V, S = 2.925V, R = 2.625V) and insert it into the blank to complete the part number. Devices in PDIP and SO packages are available in both leaded and lead-free packaging. Specify lead free by adding the + symbol at the end of the part number when ordering. Lead free not available for CERDIP package. For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

MAX690T/S/R, 704T/S/R, 802T/S/R, 804–806T/S/R 3.0V/3.3V Microprocessor Supervisory Circuits ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

5.5V for the MAX690R/MAX704R/MAX80_R; VBATT = 3.6V; TA = TMIN to TMAX; unless otherwise noted. Typical values are at TA = +25°C.) Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Terminal Voltage (with respect to GND) Continuous Input Current Continuous Power Dissipation (TA = +70°C) Operating Temperature Ranges MAX690_M_ _/MAX704_M_ _/MAX80_ _M_ _...-55°C to +125°C MAX690_M, MAX704_M, MAX80_ _M, V CC < 5.5V VCC = 2.0V, VBATT = 2.3V VCC -V CC - 0.0015 0.0006 VOUT Output Voltage V VCC -V CC - 0.35 0.15 VCC -V CC - 0.035 0.015 VCC -V CC - 0.3 0.15 VCC -V CC - 0.03 0.015 40 50 V1.1 5.5 1.0 5.5Operating Voltage Range, VCC, VBATT (Note 1) µA0.01 5 Battery Leakage Current (Note 3) 0.01 0.5 µA0.4 10 VBATT Supply Current, Any Mode (excluding I OUT) (Note 2) 0.4 1 50 65 40 55 µA 50 70 ISUPPLY VCC Supply Current (excluding IOUT) µA25 50VCC Supply Current in Battery- Backup Mode (excluding IOUT) UNITSMIN TYP MAXSYMBOLPARAMETER MAX690_C/E, MAX704_C/E, MAX80_ _C/E, I OUT = 5mA (Note 4) MAX690_E/M, MAX704_E/M, MAX80_ _E/M MAX690_M, MAX704_M, MAX80_ _M MAX690_M, MAX704_M, MAX80_ _M –M—R– = VCC (MAX704_/ MAX806_) –M—R– = VCC (MAX704_/ MAX806_) CONDITIONS MAX690_C, MAX704_C, MAX80_ _C MAX690_C/E, MAX704_C/E, MAX80_ _C/E MAX690_C/E, MAX704_C/E, MAX80_ _C/E IOUT = 250µA, VCC > 2.5V (Note 4) MAX690_M, MAX704_M, MAX80_ _M I OUT = 50mA MAX690_M, MAX704_M, MAX80_ _M I OUT = 5mA (Note 4) MAX690_C/E, MAX704_C/E, MAX80_ _C/E I OUT = 50mA MAX690_C/E, MAX704_C/E, MAX80_ _C/E, V CC < 3.6V MAX690_C/E, MAX704_C/E, MAX80_ _C/E, V CC < 5.5V MAX690_M, MAX704_M, MAX80_ _M, V CC < 3.6V

V MAX690T/S/R, 704T/S/R, 802T/S/R, 804–806T/S/R 3.0V/3.3V Microprocessor Supervisory Circuits ELECTRICAL CHARACTERISTICS (continued) 5.5V for the MAX690R/MAX704R/MAX80_R; VBATT = 3.6V; TA = TMIN to TMAX; unless otherwise noted. Typical values are at TA = +25˚C.) µA -10 +10 RESET Output Leakage Current (Note 9) -1 +1 0.17 0.3 VOL 0.13 0.3 V0.06 0.3VOL Output Voltage mV65 25 V VBATT - 0.14 VBATT VBATT - 0.1 - 0.034 VOUT in Battery-Backup Mode µV180 500IOS GND Current (Note 4) VVCC VCC - 0.3 - 0.05VOH ms140 200 280tWPReset Timeout Period 3.00 3.085 3.14 V2.30 2.40 2.50VSW Battery Switch Threshold, V CC Falling 3.00 3.075 3.15 3.00 3.085 3.17 3.00 3.075 3.12 UNITSMIN TYP MAXSYMBOLPARAMETER V 2.59 2.635 2.72 VRSTReset Threshold (Note 8) 2.55 2.625 2.70 2.55 2.635 2.72 2.59 2.625 2.70 2.88 2.935 3.02 2.85 2.925 3.00 2.85 2.935 3.02 2.88 2.925 3.00 VBattery Switch Threshold, V CC Rising (Note 7) VCC rising VCC falling VCC rising VCC falling VCC rising VCC falling VCC rising VCC falling VCC rising VCC falling VCC rising VCC falling VBATT = 0V, VCC = 1.2V, ISINK = 200µA, MAX690_E/M, MAX704_E/M, MAX80_ _E/M ISINK = 1.2mA; MAX690_/704_/802_/806_, VCC = VRST min; MAX804_/805_, VCC = VRST max VBATT - VCC, VSW > VCC > 1.75V (Note 5) IOUT = 250µA, VBATT = 2.3V VCC = 3.3V, VOH = 0V ISOURCE = 50µA VCC < 3.6V VBATT > VCC (Note 6) MAX690S/704S/805S CONDITIONS This value is identical to the reset threshold, V CC rising VBATT = 0V, V CC = VRST min; VRESET = 0V, VCC VBATT = 0V, VCC = 1.0V, ISINK = 40µA, MAX690_C, MAX704_C, MAX80_ _C MAX802R/804R/806S MAX690T/704T/805T MAX802T/804T/806T MAX690R/704R/805R MAX802S/804S/806S IOUT = 1mA, VBATT = 2.3V MAX804_E/M, MAX805_E/M MAX804_C, MAX805_C

MAX690T/S/R, 704T/S/R, 802T/S/R, 804–806T/S/R 3.0V/3.3V Microprocessor Supervisory Circuits nA-500 2 500PFI Input Current -25 2 25 MIN TYP MAX ns100 20tMR –M—R– Pulse Width V0.3 x VCC VIH–M—R– Input Threshold 0.7 x VCC ns60 500tMD –M—R– to Reset Delay µA20 60 350–M—R– Pull-Up Current V0.7 x VCCVIH 0.3 x VCCVIL WDI Input Threshold 1.12 1.60 2.24 ns100 20WDI Pulse Width VIL MAX690_M, MAX802_M, MAX804_M, MAX805_M -1 +0.01 +1 -10 +0.01 +10 µAWDI Input Current MAX690/MAX802/MAX804/ MAX805 only stWDWatchdog Timeout Period Note 1: VCC supply current, logic input leakage, watchdog functionality (MAX690_/802_/805_/804_), –M—R– functionality (MAX704_/806_), PFI functionality, state of –R—E—S—E—T– (MAX690_/704_/802_/806_), and RESET (MAX804_/805_) tested at VBATT = 3.6V, and VCC = 5.5V. The state of –R—E—S—E—T– or RESET and –P—F—O– is tested at VCC = VCC min. Note 2: Tested at VBATT = 3.6V, VCC = 3.5V and 0V. The battery current will rise to 10µA over a narrow transition window around VCC = 1.9V. Note 3: Leakage current into the battery is tested under the worst-case conditions at VCC = 5.5V, VBATT = 1.8V and at VCC = 1.5V, VBATT= 1.0V. Note 4: Guaranteed by design. Note 5: When VSW > VCC > VBATT, VOUT remains connected to VCC until VCC drops below VBATT. The VCC-to-VBATT comparator has a small 25mV typical hysteresis to prevent oscillation. For VCC < 1.75V (typ), VOUT switches to VBATT regardless of the voltage on VBATT. Note 6: When VBATT > VCC > VSW, VOUT remains connected to VCC until VCC drops below the battery switch threshold (VSW). Note 7: VOUT switches from VBATT to VCC when VCC rises above the reset threshold, independent of VBATT. Switchover back to VCC occurs at the exact voltage that causes –R—E—S—E—T– to go high (on the MAX804_/805_, RESET goes low); however switchover occurs 200ms prior to reset. Note 8: The reset threshold tolerance is wider for VCC rising than for VCC falling to accommodate the 10mV typical hysteresis, which prevents internal oscillation. Note 9: The leakage current into or out of the RESET pin is tested with RESET asserted (RESET output high impedance). MAX690_/MAX704_/MAX805_ V 1.187 1.237 1.287 VPFTPFI Input Threshold 1.212 1.237 1.262 SYMBOLPARAMETER UNITS MAX704_/MAX806_ only MAX704_/MAX806_ only MAX704_/MAX806_ only, –M—R– = 0V, VCC = 3V 0V< VCC < 5.5V MAX704_/MAX806_ only MAX690_M, MAX704_M, MAX80_ _M VCC < 3.6V VPFI falling CONDITIONS MAX690_/MAX802_/MAX804_/MAX805_ only VCC < 3.6V MAX690_C/E, MAX704_C/E, MAX80_ _C/E MAX802_C/E, MAX804_C/E, MAX806_C/E MAX690_C/E, MAX802_C/E, MAX804_C/E, MAX805_C/E MAX690_/MAX802_/MAX804_/MAX805_ only MAX690_M, MAX704_M, MAX80_ _M mV 10 25 nA-500 2 500PFI Input Current -25 2 25 VPFHPFI Hysteresis, PFI Rising 10 20 MAX690_M, MAX704_M, MAX80_ _M VCC < 3.6V MAX690_C/E, MAX704_C/E, MAX80_ _C/E MAX690_C/E, MAX704_C/E, MAX80_ _C/E ELECTRICAL CHARACTERISTICS (continued) 5.5V for the MAX690R/MAX704R/MAX80_R; VBATT = 3.6V; TA = TMIN to TMAX; unless otherwise noted. Typical values are at TA = +25˚C.)

MAX690T/S/R, 704T/S/R, 802T/S/R, 804–806T/S/R 3.0V/3.3V Microprocessor Supervisory Circuits –60 –20 60 140 VCC-to-VOUT ON-RESISTANCE vs. TEMPERATURE MAX690-806 TOC01 TEMPERATURE (°C) VCC-to-VOUT ON-RESISTANCE (Ω) 20 100–40 0 80 40 120 VCC = 5V VCC = 3.3V VCC = 2.5V VBATT = 3.0V 180 –60 –20 60 140 VBATT-to-VOUT ON-RESISTANCE vs. TEMPERATURE MAX690-806 TOC02 TEMPERATURE (°C) VBATT-to-VOUT ON-RESISTANCE (Ω) 20 100–40 0 80 40 120 140 100 VCC = 0V VBATT = 3.3V VBATT = 3V VBATT = 2V VBATT = 5V –60 –20 60 140 SUPPLY CURRENT vs. TEMPERATURE MAX690-806 TOC03 TEMPERATURE (°C) SUPPLY CURRENT (μA) 20 100–40 0 80 40 120 VCC = 5V VCC = 3.3V VCC = 2.5V VBATT = 3V PFI = GND MR/WDI FLOATING 10,000 0.1 –60 –20 60 140 BATTERY SUPPLY CURRENT vs. TEMPERATURE 1000 MAX690-806 TOC04 TEMPERATURE (°C) BATTERY SUPPLY CURRENT (nA) 20 100–40 0 80 40 120 100

10 VBATT = 3V

VBATT = 5V VBATT = 2V VCC = 0V PFI = GND 1.240 1.230 –60 –20 60 140 PFI THRESHOLD vs. TEMPERATURE 1.232 1.238 MAX690-806 TOC07 TEMPERATURE (°C) PFI THRESHOLD (V) 20 100–40 0 80 40 120 1.236 1.234 VCC = 5V VCC = 3.3V VCC = 2.5V VBATT = 3.0V 216 196 –60 –20 60 140 RESET TIMEOUT PERIOD vs. TEMPERATURE 200 212 MAX690-806 TOC05 TEMPERATURE (°C) RESET TIMEOUT PERIOD (ms) 20 100–40 0 80 40 120 208 204 VCC = 5V VCC = 3.3V VBATT = 3.0V –60 –20 60 140 RESET-COMPARATOR PROPAGATION DELAY vs. TEMPERATURE MAX690-806 TOC06 TEMPERATURE (°C) PROPAGATION DELAY (μs) 20 100–40 0 80 40 120 VBATT = 3.0V 100mV OVERDRIVE 1.004 0.994 –60 –20 60 140 NORMALIZED RESET THRESHOLD vs. TEMPERATURE 0.996 1.002 MAX690-806 TOC08 TEMPERATURE (°C) NORMALIZED RESET THRESHOLD (V) 20 100–40 0 80 40 120 1.000 0.998 VBATT = 3.0V (TA = +25°C, unless otherwise noted.)

MAX690T/S/R, 704T/S/R, 802T/S/R, 804–806T/S/R Reset Output A microprocessor’s (µP’s) reset input starts the µP in a known state. These µP supervisory circuits assert reset to prevent code execution errors during power-up, power- down, brownout conditions, or a watchdog timeout. –R—E—S—E—T– is guaranteed to be a logic low for 0V < V CC < VRST, provided that VBATT is greater than 1V. Without a backup battery, –R—E—S—E—T– is guaranteed valid for V CC > 1V. Once V CC exceeds the reset threshold, an internal timer keeps –R—E—S—E—T– low for the reset timeout period; after this interval, –R—E—S—E—T– goes high (Figure 2). If a brownout condition occurs (V CC dips below the reset threshold), –R—E—S—E—T– goes low. Each time –R—E—S—E—T– is asserted, it stays low for the reset timeout period. Any time V CC goes below the reset threshold, the internal timer restarts. The watchdog timer can also initiate a reset. See the Watchdog Input section. The MAX804_/MAX805_ active-high RESET output is open drain, and the inverse of the MAX690_/MAX704_/ Reset Threshold The MAX690T/MAX704T/MAX805T are intended for 3.3V systems with a ±5% power-supply tolerance and a 10% system tolerance. Except for watchdog faults, reset will not assert as long as the power supply remains above 3.15V (3.3V - 5%). Reset is guaranteed to assert before the power supply falls below 3.0V. The MAX690S/MAX704S/MAX805S are designed for 3.3V ±10% power supplies. Except for watchdog faults, they are guaranteed not to assert reset as long as the supply remains above 3.0V (3.3V - 10%). Reset is guaranteed to assert before the power supply falls below 2.85V (V CC - 14%). The MAX690R/MAX704R/MAX805R are optimized for monitoring 3.0V ±10% power supplies. Reset will not occur until V CC falls below 2.7V (3.0V - 10%), but is guaranteed to occur before the supply falls below The MAX802R/S/T, MAX804R/S/T, and MAX806R/S/T are respectively similar to the MAX690R/S/T, MAX805R/S/T, and MAX704R/S/T, but with tightened reset and power-fail threshold tolerances. 3.0V/3.3V Microprocessor Supervisory Circuits

1 VOUT

Supply Output for CMOS RAM. When VCC is above the reset threshold, VOUT is connected to VCC through a p-channel MOSFET switch. When VCC falls below VSW and VBATT, VBATT connects to VOUT. Connect to VCC if no battery is used.

2 VCC Main Supply Input

3 GND Ground

4 PFI Power-Fail Input. When PFI is less than VPFT or when VCC falls below VSW, –P—F—O– goes low; otherwise, –P—F—O– remains high. Connect to ground if unused. Active-Low Reset Output. Pulses low for 200ms when triggered, and stays low whenever VCC is below the reset threshold or when –M—R– is a logic low. It remains low for 200ms after either VCC rises above the reset threshold, the watchdog triggers a reset, or –M—R– goes from low to high. — –M—R– Manual Reset Input. A logic low on –M—R– asserts reset. Reset remains asserted as long as–M—R– is low and for 200ms after –M—R– returns high. This active-low input has an internal 70µA pullup current. It can be driven from a TTL or CMOS logic line, or shorted to ground with a switch. Leave open if unused.

6 WDI

Watchdog Input. If WDI remains high or low for 1.6s, the internal watchdog timer runs out and reset is triggered. The internal watchdog timer clears while reset is asserted or when WDI sees a rising or falling edge. The watchdog function cannot be disabled. 5 –P—F—O– Power-Fail Output. When PFI is less than VPFT, or VCC falls below VSW, –P—F—O– goes low; otherwise, –P—F—O– remains high. Leave open if unused.

8 VBATT

Backup-Battery Input. When VCC falls below VSW and VBATT, VOUT switches from VCC to VBATT. When VCC rises above the reset threshold, VOUT reconnects to VCC. VBATT may exceed VCC. Connect to VCC if no battery is used. — RESET Active-High, Open-Drain Reset Output is the inverse of –R—E—S—E—T–. NAME FUNCTIONMAX690 MAX802 PIN MAX804 MAX805 MAX704 MAX806

the watchdog function cannot be disabled. low voltage on PFI will generate a reset (Figure 5b). Figure 1. Block Diagram Figure 2. Timing Diagram

minimum required to reliably retain data in CMOS RAM. VCC through a 3Ω PMOS power switch. external debounce circuitry is not required. as close to the device as possible. capacitance values (e.g., order of 0.47F) for their size. battery-backup mode cannot be entered. an Additional Power Supply section). H) and below (VL) the original trip point (VTRIP). SuperCap is a trademark of Baknor Industries. Table 1. Input and Output Status in

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circu it patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 12 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 © 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc. MAX690T/S/R, 704T/S/R, 802T/S/R, 804–806T/S/R 3.0V/3.3V Microprocessor Supervisory Circuits PART** TEMP RANGE MAX704_CPA 0°C to +70°C MAX704_CSA 0°C to +70°C MAX704_C/D 0°C to +70°C Dice* 8 SO MAX704_EPA -40°C to +85°C MAX704_ESA -40°C to +85°C MAX704_MJA -55°C to +125°C 8 CERDIP 8 SO MAX802_CPA 0°C to +70°C MAX802_CSA 0°C to +70°C MAX802_C/D 0°C to +70°C Dice* 8 SO MAX802_EPA -40°C to +85°C MAX802_ESA -40°C to +85°C MAX802_MJA -55°C to +125°C 8 CERDIP 8 SO MAX804_CPA 0°C to +70°C MAX804_CSA 0°C to +70°C MAX804_C/D 0°C to +70°C Dice* 8 SO MAX804_EPA -40°C to +85°C MAX804_ESA -40°C to +85°C MAX804_MJA -55°C to +125°C 8 CERDIP 8 SO MAX805_CPA 0°C to +70°C MAX805_CSA 0°C to +70°C MAX805_C/D 0°C to +70°C Dice* 8 SO MAX805_EPA -40°C to +85°C MAX805_ESA -40°C to +85°C MAX805_MJA -55°C to +125°C 8 CERDIP 8 SO MAX806_CPA 0°C to +70°C MAX806_CSA 0°C to +70°C MAX806_C/D 0°C to +70°C Dice* 8 SO MAX806_EPA -40°C to +85°C MAX806_ESA -40°C to +85°C MAX806_MJA -55°C to +125°C 8 CERDIP 8 SO *Contact factory for dice specifications. **These parts offer a choice of reset threshold voltage. Select the letter corresponding to the desired nominal reset threshold voltage (T = 3.075V, S = 2.925V, R = 2.625V) and insert it into the blank to complete the part number. Devices in PDIP and SO packages are available in both leaded and lead-free packaging. Specify lead free by adding the + symbol at the end of the part number when ordering. Lead free not available for CERDIP package. WDI [MR] RESET (RESET) GND VCC VBATTVOUT PFI PFO 0.110" (2.794mm) 0.080" (2.032mm) ( ) ARE FOR MAX804T/S/R, MAX805T/S/R. [ ] ARE FOR MAX704T/S/R, MAX806T/S/R. TRANSISTOR COUNT: 802; SUBSTRATE IS CONNECTED TO THE HIGHER OF VCC OR VBATT, AND MUST BE FLOATED IN ANY HYBRID DESIGN.