MAX802_CPA

MAX690R MAXIM | Alldatasheet

Document overview

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Technical content

Features

• RESET and RESET Outputs
• Manual Reset Input
• Precision Supply-Voltage Monitor
• 200ms Reset Time Delay
• Watchdog Timer (1.6sec 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 RESET Assertion to VCC = 1V
• 8-Pin DIP and SO Packages

Applications

• Battery-Powered Computers and Controllers
• Embedded Controllers
• Intelligent Instruments
• Critical µP Power Monitoring
• Portable Equipment 19-0243; Rev 3; 4/15 Pin Configuration appears at end of data sheet.Typical Operating Circuits continued at at end of data sheet. 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(Pb)-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. PART TEMP RANGE PIN-PACKAGE MAX690_CPA 0°C to +70°C 8 Plastic DIP MAX690_CSA 0°C to +70°C 8 SO MAX690_C/D 0°C to +70°C Dice* MAX690_EPA -40°C to +85°C 8 Plastic DIP MAX690_ESA -40°C to +85°C 8 SO MAX690_MJA -55°C to +125°C 8 CERDIP 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 Active-Low Reset Active-High Reset Watchdog Input Manual Reset Input Backup-Battery Switch Power-Fail Threshold Accuracy Power-Fail Comparator Reset Window MAX690T/S/R, MAX704T/S/R, MAX802T/S/R, MAX804‒MAX806T/S/R 3.0V/3.3V Microprocessor Supervisory Circuits Typical Operating Circuits

Ordering Information

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.) Terminal Voltage (with respect to GND) Continuous Input Current Output Current Continuous Power Dissipation (TA = +70°C) Operating Temperature Ranges MAX690_E_ _/MAX704_E_ _/MAX80_ _E_ _. ...-40°C to +85°C MAX690_M_ _/MAX704_M_ _/MAX80_ _M_ _ ...-55°C to +125°C PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Operating Voltage Range, VCC, VBATT (Note 1) MAX690_C, MAX704_C, MAX80_ _C 1.0 5.5 V MAX690_E/M, MAX704_E/M, MAX80_ _E/M 1.1 5.5 VCC Supply Current (excluding IOUT) ISUPPLY MR = VCC (MAX704_/ MAX806_) MAX690_C/E, MAX704_C/E, MAX80_ _C/E, VCC < 3.6V 40 50 µA MAX690_C/E, MAX704_C/E, MAX80_ _C/E, VCC < 5.5V 50 65 MAX690_M, MAX704_M, MAX80_ _M, VCC < 3.6V 40 55 MAX690_M, MAX704_M, MAX80_ _M, VCC < 5.5V 50 70 VCC Supply Current in Battery- Backup Mode(excluding IOUT) MR = VCC (MAX704_/ MAX806_) VCC = 2.0V, VBATT = 2.3V 25 50 µA VBATT Supply Current, Any Mode (excluding IOUT) (Note 2) MAX690_C/E, MAX704_C/E, MAX80_ _C/E 0.4 1 µA MAX690_M, MAX704_M, MAX80_ _M 0.4 10 Battery Leakage Current (Note 3) MAX690_C/E, MAX704_C/E, MAX80_ _C/E 0.01 0.5 µA MAX690_M, MAX704_M, MAX80_ _M 0.01 5 VOUT Output Voltage MAX690_C/E, MAX704_C/E, MAX80_ _C/E, IOUT = 5mA (Note 4) VCC -0.3 VCC -0.015 V MAX690_C/E, MAX704_C/E, MAX80_ _C/E IOUT = 50mA VCC -0.3 VCC -0.15 MAX690_M, MAX704_M, MAX80_ _M IOUT = 5mA (Note 4) VCC -0.035 VCC -0.015 MAX690_M, MAX704_M, MAX80_ _M IOUT = 50mA VCC -0.35 VCC -0.15 IOUT = 250µA, VCC > 2.5V (Note 4) VCC -0.0015 VCC -0.0006 MAX690T/S/R, MAX704T/S/R, MAX802T/S/R, MAX804−MAX806T/S/R 3.0V/3.3V Microprocessor Supervisory Circuits www.maximintegrated.com Maxim Integrated │ 2 Absolute Maximum Ratings 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 specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

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.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS VOUT in Battery-Backup Mode IOUT = 250µA, VBATT = 2.3V VBATT - 0.1 VBATT - 0.034 V IOUT = 1mA, VBATT = 2.3V VBATT -0.14 Battery Switch Threshold, VCC Falling VBATT - VCC, VSW > VCC > 1.75V (Note 5) 65 25 mV VSW VBATT > VCC (Note 6) 2.30 2.40 2.50 V Battery Switch Threshold, VCC Rising (Note 7) This value is identical to the reset threshold, VCC rising V Reset Threshold (Note 8) VRST MAX690T/704T/805T VCC falling 3.00 3.075 3.15 V VCC rising 3.00 3.085 3.17 MAX802T/804T/806T VCC falling 3.00 3.075 3.12 VCC rising 3.00 3.085 3.14 MAX690S/704S/805S VCC falling 2.85 2.925 3.00 VCC rising 2.85 2.935 3.02 MAX802S/804S/806S VCC falling 2.88 2.925 3.00 VCC rising 2.88 2.935 3.02 MAX690R/704R/805R VCC falling 2.55 2.625 2.70 VCC rising 2.55 2.635 2.72 MAX802R/804R/806S VCC falling 2.59 2.625 2.70 VCC rising 2.59 2.635 2.72 Reset Timeout Period tWP VCC < 3.6V 140 200 280 ms PFO, RESET Output Voltage VOH ISOURCE = 50µA VCC- 0.3 VCC- 0.05 V PFO, RESET Output Short to GND Current (Note 4) IOS VCC = 3.3V, VOH = 0V 180 500 µV PFO, RESET, RESET Output Voltage VOL ISINK = 1.2mA; MAX690_/704_/802_/806_, VCC = VRST min; MAX804_/805_, VCC = VRST max 0.06 0.3 V PFO, RESET Output Voltage VOL VBATT = 0V, VCC = 1.0V, ISINK = 40µA, MAX690_C, MAX704_C, MAX80_ _C 0.13 0.3 V VBATT = 0V, VCC = 1.2V, ISINK = 200µA, MAX690_E/M, MAX704_E/M, MAX80_ _E/M 0.17 0.3 RESET Output Leakage Current (Note 9) VBATT = 0V, VCC = VRST min; VRESET = 0V, VCC MAX804_C, MAX805_C -1 +1 µA MAX804_E/M, MAX805_E/M -10 +10 MAX690T/S/R, MAX704T/S/R, MAX802T/S/R, MAX804−MAX806T/S/R 3.0V/3.3V Microprocessor Supervisory Circuits www.maximintegrated.com Maxim Integrated │ 3 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 = +25C.) Note 1: VCC supply current, logic input leakage, watchdog functionality (MAX690_/802_/805_/804_), MR functionality (MAX704_/806_), PFI functionality, state of RESET (MAX690_/704_/802_/806_), and RESET (MAX804_/805_) tested at VBATT = 3.6V, and VCC = 5.5V. The state of RESET or RESET and PFO 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 V CC = 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 compara- tor has a small 25mV typical hysteresis to prevent oscillation. For V CC < 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 (V SW). 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 RESET 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 V CC 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). PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS PFI Input Threshold VPFT VCC < 3.6V VPFI falling MAX802_C/E, MAX804_C/E, MAX806_C/E 1.212 1.237 1.262 V MAX690_/MAX704_/MAX805_ 1.187 1.237 1.287 PFI Input Current MAX690_C/E, MAX704_C/E, MAX80_ _C/E -25 2 25 nA MAX690_M, MAX704_M, MAX80_ _M -500 2 500 PFI Hysteresis, PFI Rising VPFH VCC < 3.6V MAX690_C/E, MAX704_C/E, MAX80_ _C/E 10 20 mV MAX690_M, MAX704_M, MAX80_ _M 10 25 PFI Input Current MAX690_C/E, MAX704_C/E, MAX80_ _C/E -25 2 25 nA MAX690_M, MAX704_M, MAX80_ _M -500 2 500 MR Input Threshold VIH MAX704_/MAX806_ only 0.7 x VCC V VIL 0.3 x VCC MR Pulse Width tMR MAX704_/MAX806_ only 100 20 ns MR to Reset Delay tMD MAX704_/MAX806_ only 60 500 ns MR Pull-Up Current MAX704_/MAX806_ only, MR = 0V, VCC = 3V 20 60 350 µA WDI Input Threshold VIH MAX690_/MAX802_/MAX804_/MAX805_ only 0.7 x VCC V VIL 0.3 x VCC WDI Input Current 0V< VCC < 5.5V MAX690_C/E, MAX802_C/E, MAX804_C/E, MAX805_C/E -1 +0.01 +1 µA MAX690_M, MAX802_M, MAX804_M, MAX805_M -10 +0.01 +10 Watchdog Timeout Period tWD VCC < 3.6V MAX690/MAX802/MAX804/ MAX805 only 1.12 1.60 2.24 s WDI Pulse Width MAX690_/MAX802_/MAX804_/MAX805_ only 100 20 ns MAX690T/S/R, MAX704T/S/R, MAX802T/S/R, MAX804−MAX806T/S/R 3.0V/3.3V Microprocessor Supervisory Circuits www.maximintegrated.com Maxim Integrated │ 4 Electrical Characteristics (continued)

(TA = +25°C, unless otherwise noted.) 180 –60 –20 60 140 VBATT-TO-VOUT ON-RESISTANCE vs. TEMPERATURE MAX690 toc02 TEMPERATURE (°C) VBATT-TO-VOUT ON-RESISTANCE (Ω) 20 100–40 0 8040 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 8040 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 toc04 TEMPERATURE (°C) BATTERY SUPPLY CURRENT (nA) 20 100–40 0 8040 120 100

10 VBATT = 3V

VBATT = 5V VBATT = 2V VCC = 0V PFI = GND 216 196 –60 –20 60 140 RESET TIMEOUT PERIOD vs. TEMPERATURE 200 212 MAX690 toc05 TEMPERATURE (°C) RESET TIMEOUT PERIOD (ms) 20 100–40 0 8040 120 208 204 VCC = 5V VCC = 3.3V VBATT = 3.0V –60 –20 60 140 RESET-COMPARATOR PROPAGATION DELAY vs. TEMPERATURE MAX690 toc06 TEMPERATURE (°C) PROPAGATION DELAY (µs) 20 100–40 0 8040 120 VBATT = 3.0V 100mV OVERDRIVE 1.240 1.230 –60 –20 60 140 PFI THRESHOLD vs. TEMPERATURE 1.232 1.238 MAX690 toc07 TEMPERATURE (°C) PFI THRESHOLD (V) 20 100–40 0 8040 120 1.236 1.234 VCC = 5V VCC = 3.3V VCC = 2.5V VBATT = 3.0V –60 –20 60 140 VCC-TO-VOUT ON-RESISTANCE vs. TEMPERATURE MAX690 toc01 TEMPERATURE (°C) VCC-TO-VOUT ON-RESISTANCE (Ω) 20 100–40 0 8040 120 VCC = 5V VCC = 3.3V VCC = 2.5V VBATT = 3.0V 1.004 0.994 –60 –20 60 140 NORMALIZED RESET THRESHOLD vs. TEMPERATURE 0.996 1.002 MAX690 toc08 TEMPERATURE (°C) NORMALIZED RESET THRESHOLD (V) 20 100–40 0 8040 120 1.000 0.998 VBATT = 3.0V 3.0V/3.3V Microprocessor Supervisory Circuits Maxim Integrated │ 5 www.maximintegrated.com MAX690T/S/R, MAX704T/S/R, MAX802T/S/R, MAX804−MAX806T/S/R Typical Operating Characteristics

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. RESET is guaranteed to be a logic low for 0V < V CC < VRST, provided that VBATT is greater than 1V. Without a backup battery, RESET is guaranteed valid for VCC > 1V. Once VCC exceeds the reset threshold, an internal timer keeps RESET low for the reset timeout period; after this interval, RESET goes high (Figure 2). If a brownout condition occurs (V CC dips below the reset threshold), RESET goes low. Each time RESET is assert- ed, it stays low for the reset timeout period. Any time VCC 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_/ MAX802_/MAX806_ RESET output. 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 (VCC - 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 2.59V (3.0V - 14%). 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. PIN NAME FUNCTIONMAX690 MAX802 MAX704 MAX806 MAX804 MAX805 1 1 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 2 2 VCC Main Supply Input 3 3 3 GND Ground 4 4 4 PFI Power-Fail Input. When PFI is less than VPFT or when VCC falls below VSW, PFO goes low; otherwise, PFO remains high. Connect to ground if unused. 5 5 5 PFO Power-Fail Output. When PFI is less than VPFT, or VCC falls below VSW, PFO goes low; otherwise, PFO remains high. Leave open if unused. 6 — 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. — 6 — MR Manual Reset Input. A logic low on MR asserts reset. Reset remains asserted as long as MR is low and for 200ms after MR 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. 7 7 — RESET Active-Low Reset Output. Pulses low for 200ms when triggered, and stays low whenever VCC is below the reset threshold or when MR is a logic low. It remains low for 200ms after either VCC rises above the reset threshold, the watchdog triggers a reset, or MR goes from low to high. — — 7 RESET Active-High, Open-Drain Reset Output is the inverse of RESET. 8 8 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. MAX690T/S/R, MAX704T/S/R, MAX802T/S/R, MAX804−MAX806T/S/R 3.0V/3.3V Microprocessor Supervisory Circuits www.maximintegrated.com Maxim Integrated │ 6 Pin Description

RESET pulse is triggered every 1.8sec (t WD plus tRS). watchdog function cannot be disabled. PFI will generate a reset (Figure 5b). Figure 1. Block Diagram Figure 2. Timing Diagram

switch RAM to backup power when V CC falls. have a higher voltage than V CC. minimum required to reliably retain data in CMOS RAM. through a 3Ω PMOS power switch. debounce circuitry is not required. these µP supervisors with a SuperCap. such as the MAX706T/S/R or MAX708T/S/R. above (VH) and below (VL) the original trip point (V TRIP). Table 1. Input and Output Status in

For the latest package outline information and land patterns, go to www.maximintegrated.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE e CODE OUTLINE NO. LAND PATTERN NO.

8 PDIP P8+2 21-0043 —

8 CDIP J8+2 21-0045 —

8 SOIC S8+4 21-0041 90-0096

*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(Pb)-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. PART TEMP RANGE PIN-PACKAGE MAX704_CPA 0°C to +70°C 8 Plastic DIP MAX704_CSA 0°C to +70°C 8 SO MAX704_C/D 0°C to +70°C Dice* MAX704_EPA -40°C to +85°C 8 Plastic DIP MAX704_ESA -40°C to +85°C 8 SO MAX704_MJA -55°C to +125°C 8 CERDIP MAX802_CPA 0°C to +70°C 8 Plastic DIP MAX802_CSA 0°C to +70°C 8 SO MAX802_C/D 0°C to +70°C Dice* MAX802_EPA -40°C to +85°C 8 Plastic DIP MAX802_ESA -40°C to +85°C 8 SO MAX802_MJA -55°C to +125°C 8 CERDIP MAX804_CPA 0°C to +70°C 8 Plastic DIP MAX804_CSA 0°C to +70°C 8 SO MAX804_C/D 0°C to +70°C Dice* MAX804_EPA -40°C to +85°C 8 Plastic DIP MAX804_ESA -40°C to +85°C 8 SO MAX804_MJA -55°C to +125°C 8 CERDIP MAX805_CPA 0°C to +70°C 8 Plastic DIP MAX805_CSA 0°C to +70°C 8 SO MAX805_C/D 0°C to +70°C Dice* MAX805_EPA -40°C to +85°C 8 Plastic DIP MAX805_ESA -40°C to +85°C 8 SO MAX805_MJA -55°C to +125°C 8 CERDIP MAX806_CPA 0°C to +70°C 8 Plastic DIP MAX806_CSA 0°C to +70°C 8 SO MAX806_C/D 0°C to +70°C Dice* MAX806_EPA -40°C to +85°C 8 Plastic DIP MAX806_ESA -40°C to +85°C 8 SO MAX806_MJA -55°C to +125°C 8 CERDIP 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 MAX690T/S/R, MAX704T/S/R, MAX802T/S/R, MAX804−MAX806T/S/R 3.0V/3.3V Microprocessor Supervisory Circuits www.maximintegrated.com Maxim Integrated │ 12 Ordering Information (continued)Pin Configuration

Package Information

Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. 3.0V/3.3V Microprocessor Supervisory Circuits © 2015 Maxim Integrated Products, Inc. │ 13 MAX690T/S/R, MAX704T/S/R, MAX802T/S/R, MAX804−MAX806T/S/R

Revision History

3 4/15 No /V OPNs in Ordering Information; deleted Automotive Systems in Applications Information section; added Package Information and Revision History tables 1, 12, 13 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.