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Part Number: MAX818M
Description: The MAX817/MAX818/MAX819 microprocessor (P) supervisory circuits simplify power-supply monitoring, bat...
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MAX818M
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DataSheet
General Description
MAX818M General Description
The MAX817/MAX818/MAX819 microprocessor (P) supervisory circuits simplify power-supply monitoring, battery control, and chip-enable gating in P systems by reducing the number of components required. These devices are designed for use in +5V-powered systems. Low supply current (11A typical) and small package size make these devices ideal for portable applications. The MAX817/MAX818/MAX819 are specifically designed to ignore fast transients on VCC. Other supervisory functions include active-low reset, backupbattery switchover, watchdog input, battery freshness seal, and chip-enable gating. The Selector Guide below lists the specific functions available from each device.
These devices offer two pretrimmed reset threshold voltages for ±5% or ±10% power supplies: 4.65V for the L versions and 4.40V for the M versions. The MAX817/ MAX818/MAX819 are available in space-saving MAX packages, as well as 8-pin DIP/SO.
MAX818M Maximum Ratings
Input Voltage
VCC, BATT .......................................................................-0.3V to +6.0V
All Other Pins (Note 1).....................................................-0.3V to (VCC + 0.3V)
Input Current
VCC Peak .........................................................................1A
VCC Continuous ...............................................................250mA
BATT Peak .......................................................................250mA
BATT Continuous ............................................................50mA
GND..................................................................................25mA
Output Current
OUT..................................................................................250mA
All Other Outputs ............................................................25mA
OUT Short-Circuit Duration..............................................10sec
Continuous Power Dissipation (TA = +70°C)
Plastic DIP (derate 9.09mW/°C above +70°C) .............727mW
SO (derate 5.88mW/°C above +70°C)..........................471mW
MAX (derate 4.10mW/°C above +70°C) .....................330mW
Operating Temperature Ranges
MAX81_ _C_A ..................................................................0°C to +70°C
MAX81_ _E_A .................................................................-40°C to +85°C
Storage Temperature Range ..........................................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
VCC, BATT .......................................................................-0.3V to +6.0V
All Other Pins (Note 1).....................................................-0.3V to (VCC + 0.3V)
Input Current
VCC Peak .........................................................................1A
VCC Continuous ...............................................................250mA
BATT Peak .......................................................................250mA
BATT Continuous ............................................................50mA
GND..................................................................................25mA
Output Current
OUT..................................................................................250mA
All Other Outputs ............................................................25mA
OUT Short-Circuit Duration..............................................10sec
Continuous Power Dissipation (TA = +70°C)
Plastic DIP (derate 9.09mW/°C above +70°C) .............727mW
SO (derate 5.88mW/°C above +70°C)..........................471mW
MAX (derate 4.10mW/°C above +70°C) .....................330mW
Operating Temperature Ranges
MAX81_ _C_A ..................................................................0°C to +70°C
MAX81_ _E_A .................................................................-40°C to +85°C
Storage Temperature Range ..........................................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
MAX818M Features
Precision Supply-Voltage Monitor: 4.65V (MAX81_L) 4.40V (MAX81_M)
11A Quiescent Supply Current
200ms Reset Time Delay
Watchdog Timer with 1.6sec Timeout (MAX817/MAX818)
Battery-Backup Power Switching; Battery Voltage Can Exceed VCC
Battery Freshness Seal
On-Board, 3ns Gating of Chip-Enable Signals (MAX818)
Uncommitted Voltage Monitor for Power-Fail or Low-Battery Warning (MAX817/MAX819)
Manual Reset Input (MAX819)
11A Quiescent Supply Current
200ms Reset Time Delay
Watchdog Timer with 1.6sec Timeout (MAX817/MAX818)
Battery-Backup Power Switching; Battery Voltage Can Exceed VCC
Battery Freshness Seal
On-Board, 3ns Gating of Chip-Enable Signals (MAX818)
Uncommitted Voltage Monitor for Power-Fail or Low-Battery Warning (MAX817/MAX819)
Manual Reset Input (MAX819)
MAX818M Typical Application
The MAX817/MAX818/MAX819 are protected for typical short-circuit conditions of 10sec or less. Shorting OUT to ground for longer than 10sec destroys the device. Decouple VCC, OUT, and BATT to ground by placing 0.1F capacitors as close to the device as possible.
MAX818M Connection Diagram
MAX818M
PDF/DataSheet Download
- Datasheet: MAX818M
- File Size: 117189 KB
- Manufacturer: MAXIM [Maxim Integrated Products]
- Click here to Download
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