MAX807MEPE+ Maxim Integrated Products, MAX807MEPE+ Datasheet - Page 8
![IC SUPERVISOR MPU 16-DIP](/photos/6/57/65728/175-16-dip_sml.jpg)
MAX807MEPE+
Manufacturer Part Number
MAX807MEPE+
Description
IC SUPERVISOR MPU 16-DIP
Manufacturer
Maxim Integrated Products
Type
Battery Backup Circuitr
Datasheet
1.MAX807NEWE.pdf
(16 pages)
Specifications of MAX807MEPE+
Number Of Voltages Monitored
1
Reset
Active High/Active Low
Reset Timeout
140 ms Minimum
Voltage - Threshold
4.575V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Through Hole
Package / Case
16-DIP (0.300", 7.62mm)
Monitored Voltage
4.425 V
Output Type
Active High, Active Low
Manual Reset
Resettable
Watchdog
Watchdog
Battery Backup Switching
Backup
Supply Voltage (max)
5.5 V
Supply Voltage (min)
0 V
Supply Current (typ)
70 uA
Maximum Power Dissipation
842 mW
Maximum Operating Temperature
+ 85 C
Mounting Style
Through Hole
Minimum Operating Temperature
- 40 C
Power Fail Detection
Yes
Undervoltage Threshold
4.35 V
Overvoltage Threshold
4.5 V
Power-up Reset Delay (typ)
280 ms
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Output
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Full-Featured µP Supervisory Circuit with
±1.5% Reset Accuracy
The MAX807 µP supervisory circuit provides power-
supply monitoring, backup-battery switchover, and pro-
gram execution watchdog functions in µP systems
(Figure 1). Use of BiCMOS technology results in an
improved 1.5% reset-threshold precision, while keeping
supply currents typically below 70µA. The MAX807 is
intended for battery-powered applications that require
high reset-threshold precision, allowing a wide power-
supply operating range while preventing the system
from operating below its specified voltage range.
Figure 1. Block Diagram
8
_______________________________________________________________________________________
CE IN
BATT
GND
V
PFI
CC
Detailed Description
2.275V
BATTERY-BACKUP
COMPARATOR
RESET
COMPARATOR
LOW-LINE
COMPARATOR
BATTERY-OK
COMPARATOR
POWER-FAIL
COMPARATOR
MAX807
OSCILLATOR
The MAX807’s RESET output ensures that the µP pow-
ers up in a known state, and prevents code execution
errors during power-down and brownout conditions. It
accomplishes this by resetting the µP, terminating pro-
gram execution when V
old or MR is pulled low. Each time RESET is asserted it
stays low for the 200ms reset timeout period, which is
set by an internal timer to ensure the µP has adequate
time to return to an initial state. Any time V
below the reset threshold before the reset-timeout peri-
od is completed, the internal timer restarts. The watch-
dog timer can also initiate a reset if WDO is connected
to MR (see the Watchdog Input section).
P
N
WATCHDOG
TRANSITION
DETECTOR
MACHINE
STATE
OF V
THE HIGHER
CC
V
CC
OR V
RESET and RESET Outputs
P
50kΩ
BATT
CC
P
N
dips below the reset thresh-
OUT
BATT ON
LOW LINE
BATT OK
PFO
WDI
MR
RESET
RESET
WDO
CE OUT
CC
goes