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MFG:DIP  Package Cooled:MAXIM  D/C:04+  

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Part Number: MAX818L

 

MFG: DIP

Package Cooled: MAXIM

D/C: 04+

Description: The MAX817/MAX818/MAX819 microprocessor (P) supervisory circuits simplify power-supply monitoring, bat...


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MAX818L 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.

MAX818L 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

MAX818L 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)

MAX818L 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.

MAX818L Connection Diagram

MAX818L Connection Diagram

MAX818L datasheet

MAX818L
PDF/DataSheet Download

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