MAX807N Maxim Integrated Products, MAX807N Datasheet
MAX807N
Manufacturer Part Number
MAX807N
Description
Full-Featured P Supervisory Circuit with 1.5eset Accuracy
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX807N.pdf
(16 pages)
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The MAX807 microprocessor (µP) supervisory circuit
reduces the complexity and number of components
needed to monitor power-supply and battery-control func-
tions in µP systems. A 70µA 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) µP reset. The active-low RESET output is asserted dur-
2) Active-high RESET output.
3) Manual-reset input.
4) Two-stage power-fail warning. A separate low-line
5) Backup-battery switchover for CMOS RAM, real-time
6) Write protection of CMOS RAM or EEPROM.
7) 2.275V threshold detector—provides for power-fail
8) BATT OK status flag indicates that the backup-battery
9) Watchdog-fault output—asserted if the watchdog input
________________________Applications
19-0433; Rev 0; 9/95
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.
Call toll free 1-800-998-8800 for free samples or literature.
_______________General Description
ing power-up, power-down, and brownout conditions,
and is guaranteed to be in the correct state for V
down to 1V.
comparator compares V
the reset threshold. This low-line comparator is more
accurate than those in previous µP supervisors.
clocks, µPs, or other low-power logic.
warning and low-battery detection, or monitors a
power supply other than +5V.
voltage is above 2.275V.
has not been toggled within a preset timeout period.
Computers
Controllers
Intelligent Instruments
Critical µP Power Monitoring
Portable/Battery-Powered Equipment
Full-Featured µP Supervisory Circuit with
________________________________________________________________ Maxim Integrated Products
CC
to a threshold 52mV above
CC
____________________________Features
±1.5% Reset Accuracy
__________________Pin Configuration
Precision 4.675V (MAX807L) or 4.425V
(MAX807M), or 4.575V (MAX807N) Voltage
Monitoring
200ms Power OK / Reset Time Delay
RESET and RESET Outputs
Independent Watchdog Timer
1µA Standby Current
Power Switching:
On-Board Gating of Chip-Enable Signals:
MaxCap™ and SuperCap™ Compatible
Voltage Monitor for Power-Fail
Backup-Battery Monitor
Guaranteed RESET Valid to V
±1.5% Low-line Threshold Accuracy 52mV above
Reset Threshold
250mA in V
20mA in Battery-Backup Mode
2ns CE Gate Propagation Delay
TOP VIEW
LOW LINE
RESET
GND
WDI
PFO
V
MR
CC
PFI
CC
Mode
1
2
3
4
5
6
7
8
MAX807
DIP/SO
CC
16
15
14
13
12
11
10
9
= 1V
WDO
RESET
OUT
BATT
CE IN
CE OUT
BATT OK
BATT ON
1
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