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Part: MAX6367
Category:
Power Management
-> Supervisory Circuits
-> Microprocessor Supervisors
Description: SOT23, Low-power P Supervisory Circuits With Battery Backup And Chip-enable Gating
Company: Maxim Integrated Products
Datasheet: Download MAX6367 datasheet File size : 383 kB
Request For quote: Find where to buy MAX6367
Datasheet text preview:
19-1658; Rev 1; 6/01
SOT23, Low-Power µP Supervisory Circuits with Battery Backup and Chip-Enable Gating
General Description
The MAX6365MAX6368 supervisory circuits simplify power-supply monitoring, battery-backup control functions, and memory write protection in microprocessor (µP) systems. The circuits significantly improve the size, accuracy, and reliability of modern systems with an ultrasmall integrated solution. These devices perform four basic system functions: 1) Provide a µP reset output during VCC supply powerup, power-down, and brownout conditions. 2) Internally control VCC to backup-battery switching to m a i n t a i n data or low-power operation for CMOS RAM, CMOS µPs, real-time clocks, and other digital logic when the main supply fails. 3) Provide memory write protection through internal chip-enable gating during supply or processor faults. 4) Include one of the following options: a manual reset i n p u t (MAX6365), a watchdog timer function (MAX6366), a battery-on output (MAX6367), or an auxiliary user-adjustable reset input (MAX6368). The MAX6365MAX6368 operate from VCC supply voltages as low as 1.2V. The factory preset reset threshold v o l t a g e s range from 2.32V to 4.63V (see Ordering Information). In addition, each part is offered in three reset output versions: push-pull active low, open-drain a c t i v e low, or open-drain active high (see Selector Guide). The MAX6365MAX6368 are available in miniature 8-pin SOT23 packages.
Features
o Low +1.2V Operating Supply Voltage (VCC or VBATT) o Precision Monitoring of +5.0V, +3.3V, +3.0V, and +2.5V Power-Supply Voltages o On-Board Gating of Chip-Enable Signals, 1.5ns Propagation Delay o Debounced Manual Reset Input (MAX6365) o Watchdog Timer, 1.6s Timeout (MAX6366) o Battery-On Output Indicator (MAX6367) o Auxiliary User-Adjustable RESET IN (MAX6368) o Low 10µA Quiescent Supply Current o Three Available Output Structures Push-Pull RESET Open-Drain RESET Open-Drain RESET o RESET/RESET Valid Down to 1.2V Guaranteed (VCC or VBATT) o Power-Supply Transient Immunity o 150ms min Reset Timeout Period o Miniature 8-Pin SOT23 Package
MAX6365MAX6368
Ordering Information
PART* MA X6 36 5LKA_ _-T MAX6365PKA_ _-T MAX6365HKA_ _-T MA X6 36 6LKA_ _-T MAX6366PKA_ _-T MAX6366HKA_ _-T MA X6 36 7LKA_ _-T MAX6367PKA_ _-T MAX6367HKA_ _-T MA X6 36 8LKA_ _-T MAX6368PKA_ _-T MAX6368HKA_ _-T TEMP. RANGE -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C PINPACKAGE 8 SOT23-8 8 SOT23-8 8 SOT23-8 8 SOT23-8 8 SOT23-8 8 SOT23-8 8 SOT23-8 8 SOT23-8 8 SOT23-8 8 SOT23-8 8 SOT23-8 8 SOT23-8
Applications
Critical µP/µC Power Monitoring Fax Machines Industrial Control Computers/Controllers Portable/BatteryPowered Equipment Set-Top Boxes POS Equipment
Pin Configurations
TOP VIEW
RESET, RESET CE IN GND 1 2 8 7 CE OUT BATT OUT VCC
MAX6365
3 6 5 MR 4
*These parts offer a choice of reset threshold voltages. From the Reset Threshold Ranges table, insert the desired threshold voltage code in the blank to complete the part number. SOT parts come in tape-and-reel only and must be ordered in 2500-piece increments. See Device Marking Codes for a complete parts list, including SOT top marks and standard threshold versions. See Selector Guide for a listing of device features.
SOT23 Pin Configurations continued at end of data sheet.
Typical Operating Circuit appears at end of data sheet. 1
________________________________________________________________ Maxim Integrated Products
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.
SOT23, Low-Power µP Supervisory Circuits with Battery Backup and Chip-Enable Gating MAX6365MAX6368
ABSOLUTE MAXIMUM RATINGS
Terminal Voltages (with respect to GND) VCC, BATT, OUT.......-0.3V to +6V RESET (open drain), RESET (open drain) .......-0.3V to +6V BATT ON, RESET (push-pull), RESET IN, WDI, CE IN, CE OUT ...-0.3V to (VOUT + 0.3V) MR .....-0.3V to (VCC + 0.3V) Input Current VCC Peak ......1A VCC Continuous ....250mA BATT Peak ............250mA BATT Continuous ....40mA GND .......75mA Output Current OUT .......Short-Circuit Protected for up to 10s RESET, RESET, BATT ON, CE OUT .......20mA Continuous Power Dissipation (TA = +70°C) 8-Pin SOT23 (derate 8.75mW/°C above +70°C)........700mW Operating Temperature Range ...-40°C to +85°C Storage Temperature Range .....-65°C to +150°C Junction Temperature .....+150°C Lead Temperature (soldering, 10s) .........+300°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 specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VCC = +2.4V to +5.5V, VBATT = +3.0V, CE IN = VCC, reset not asserted, TA = -40°C to +85°C. Typical values are at TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER Operating Voltage Range (Note 2) Supply Current (Excluding IOUT) Supply Current in BatteryBackup Mode (Excluding IOUT) BATT Standby Current SYMBOL VCC, VBATT No load VCC = 2.8V ICC No load, VCC > VTH VBATT = 2.8V, VCC = 0 5.5V > VCC > (VBATT + 0.2V) VCC = 3.6V VCC = 5.5V IB A C K I BATT TA = +25°C TA = -40°C to +85°C TA = +25°C TA = -40°C to +85°C -0.1 -1.0 CONDITIONS MIN 0 10 12 15 TYP MAX 5.5 30 35 50 1 3 0.02 0.02 3.1 3.7 4.6 VBATT 0.2 V BATT 0.15 VBATT 0.15 20 -20 4.50 4.25 3.00 2.85 2.55 2.25 4.63 4.38 3.08 2.93 2.63 2.32 20 4.75 4.50 3.15 3.00 2.70 2.38 µs V µA µA µA UNITS V
VCC = 4.75V, IOUT = 150mA VCC to OUT On-Resistance RON VCC = 3.15V, IOUT = 65mA VCC = 2.38V, IOUT = 25mA VBATT = 4.5V, IOUT = 20mA Output Voltage in BatteryBackup Mode V OUT VBATT = 3.0V, IOUT = 10mA VBATT = 2.25V, IOUT = 5mA Battery-Switchover Threshold (VCC - VBATT) VSW VCC < VTH MAX636_ _KA46 MAX636_ _KA44 Reset Threshold VTH MAX636_ _KA31 MAX636_ _KA29 MAX636_ _KA26 MAX636_ _KA23 VCC Falling Reset Delay tRD VCC falling at 10V/ms Power-up Power-down
V
mV
2
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SOT23, Low-Power µP Supervisory Circuits with Battery Backup and Chip-Enable Gating
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +2.4V to +5.5V, VBATT = +3.0V, CE IN = VCC, reset not asserted, TA = -40°C to +85°C. Typical values are at TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER Reset Active Timeout Period SYMBOL tRP Reset asserted, VBATT = 0 Reset not asserted (MAX636_L only) Reset not asserted Reset not asserted, VBATT = 0 (MAX636_H only) (Note 3) ISINK = 1.6mA, VCC > 2.1V ISINK = 100µA, VCC > 1.2V ISOURCE = 500µA, VCC > VTH(MAX) ISINK = 1.6mA, VCC > VTH (MAX) ISOURCE = 1mA, VCC > 1.8V ISOURCE = 200µA, VCC > 1.2V 0.7 VCC 0.8 VCC 1 0.3 VCC 0.7 VCC 20 1 VCC = 3.3V VCC = 3.3V tWD tWDI VIL WDI Input Voltage VIH WDI Input Current BATT ON (MAX6367 only) Output Voltage Output Short-Circuit Current VOL ISINK = 3.2mA, VBATT = 2.1V Sink current, VCC = 5V Source current, VBATT > 2V 10 60 30 100 0.4 V mA µA 0.7 VCC -1.0 1.0 µA 1.00 100 0.3 VCC 100 120 1.65 2.25 k µs ns ns s ns µA 0.8 VCC 0.3 V CONDITIONS MIN 150 TYP MAX 280 0.3 0.4 V UNITS ms
MAX6365MAX6368
VOL RESET Output Voltage VOH VOL RESET Output Voltage VOH
RESET Output Leakage Current MANUAL RESET (MAX6365 only)
ILKG
MAX636_P and MAX636_H only
VIL MR Input Voltage VIH Pullup Resistance Minimum Pulse Width Glitch Immunity MR to Reset Delay WATCHDOG (MAX6366 only) Watchdog Timeout Period Minimum WDI Input Pulse Width
V
V
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