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MAX807 Datasheet

  • MAX807

  • Full-Featured µP Supervisory Circuit with ±1.5&...

  • 263.53KB

  • maxim   maxim

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19-0433; Rev 0; 9/95
Full-Featured 碌P Supervisory Circuit with
鹵1.5% Reset Accuracy
_______________General Description
The MAX807 microprocessor (碌P) supervisory circuit
reduces the complexity and number of components
needed to monitor power-supply and battery-control func-
tions in 碌P systems. A 70碌A supply current makes the
MAX807 ideal for use in portable equipment, while a 2ns
chip-enable propagation delay and 250mA output current
capability (20mA in battery-backup mode) make it suit-
able for larger, higher-performance equipment.
The MAX807 comes in 16-pin DIP and SO packages, and
provides the following functions:
1) 碌P reset. The active-low RESET output is asserted dur-
ing power-up, power-down, and brownout conditions,
and is guaranteed to be in the correct state for V
CC
down to 1V.
2) Active-high RESET output.
3) Manual-reset input.
4) Two-stage power-fail warning. A separate low-line
comparator compares V
CC
to a threshold 52mV above
the reset threshold. This low-line comparator is more
accurate than those in previous 碌P supervisors.
5) Backup-battery switchover for CMOS RAM, real-time
clocks, 碌Ps, or other low-power logic.
6) Write protection of CMOS RAM or EEPROM.
7) 2.275V threshold detector鈥攑rovides for power-fail
warning and low-battery detection, or monitors a
power supply other than +5V.
8) BATT OK status flag indicates that the backup-battery
voltage is above 2.275V.
9) Watchdog-fault output鈥攁sserted if the watchdog input
has not been toggled within a preset timeout period.
____________________________Features
o
Precision 4.675V (MAX807L) or 4.425V
(MAX807M), or 4.575V (MAX807N) Voltage
Monitoring
o
200ms Power OK / Reset Time Delay
o
RESET and RESET Outputs
o
Independent Watchdog Timer
o
1碌A Standby Current
o
Power Switching:
250mA in V
CC
Mode
20mA in Battery-Backup Mode
o
On-Board Gating of Chip-Enable Signals:
2ns CE Gate Propagation Delay
o
MaxCap鈩?and SuperCap鈩?Compatible
o
Voltage Monitor for Power-Fail
o
Backup-Battery Monitor
o
Guaranteed RESET Valid to V
CC
= 1V
o
鹵1.5% Low-line Threshold Accuracy 52mV above
Reset Threshold
MAX807L/M/N
__________________Pin Configuration
________________________Applications
Computers
Controllers
Intelligent Instruments
Critical 碌P Power Monitoring
Portable/Battery-Powered Equipment
TOP VIEW
PFI 1
PFO 2
V
CC
3
WDI
4
16 OUT
15 BATT OK
14 BATT
MAX807
13 BATT ON
12 CE IN
11 CE OUT
10 WDO
9
RESET
GND 5
MR
LOW LINE
RESET
6
7
8
DIP/SO
Ordering Information and Typical Operating Circuit appear at end of data sheet.
SuperCap is a trademark of Baknor Industries. MaxCap is a trademark of The Carborundum Corp.
________________________________________________________________
Maxim Integrated Products
1
Call toll free 1-800-998-8800 for free samples or literature.

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