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MAX807LCWE+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
General Description
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, SO, and TSSOP pack-
ages, and provides the following functions:
•µP 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.
• Active-high RESET output.
• Manual-reset input.
• 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 µP supervisors.
• Backup-battery switchover for CMOS RAM, real-time
clocks, µPs, or other low-power logic.
• Write protection of CMOS RAM or EEPROM.
• 2.275V threshold detector provides for power-fail
warning and low-battery detection, or monitors a
power supply other than +5V.
• BATT OK status flag indicates that the backup-battery
voltage is above +2.275V.
• Watchdog-fault output—asserted if the watchdog input
has not been toggled within a preset timeout period.
Applications
Computers
Controllers
Intelligent Instruments
Critical µP Power Monitoring
Portable/Battery-Powered Equipment
Features
♦ Precision 4.675V (MAX807L), 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
250mA in V
CC
Mode
20mA in Battery-Backup Mode
♦ On-Board Gating of Chip-Enable Signals;
2ns CE Gate Propagation Delay
♦ MaxCap
®
and SuperCap
®
Compatible
♦ Voltage Monitor for Power Fail
♦ Backup-Battery Monitor
♦ Guaranteed RESET Valid to V
CC
= 1V
♦ ±1.5% Low-Line Threshold Accuracy 52mV above
Reset Threshold
MAX807L/M/N
Full-Featured µP Supervisory Circuit with
±1.5% Reset Accuracy
________________________________________________________________ Maxim Integrated Products 1
19-0433; Rev 4; 11/05
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
RESET
RESET
WDO
CE IN
GND
V
CC
OUT
BATT
TOP VIEW
MAX807
CE OUT
WDI
LOW LINE
MR
BATT OK
PFI
PFO
BATT ON
DIP/SO/TSSOP
Pin Configuration
Ordering Information and Typical Operating Circuit appear at end of data sheet.
SuperCap is a registered trademark of Baknor Industries. MaxCap is a registered trademark of Cesiwid, Inc.
MAX807L/M/N
Full-Featured µP Supervisory Circuit with
±1.5% Reset Accuracy
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= 4.60V to 5.5V for the MAX807L, V
CC
= 4.50V to 5.5V for the MAX807N, V
CC
= 4.35V to 5.5V for the MAX807M,
V
BATT
= 2.8V, V
PFI
= 0V, T
A
= T
MIN
to T
MAX
. Typical values are tested with V
CC
= 5V and T
A
= +25°C, unless otherwise noted.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Input Voltages (with respect to GND)
V
CC
..........................................................................-0.3V to 6V
V
BATT
.......................................................................-0.3V to 6V
All Other Inputs......................................-0.3V to (V
OUT
+ 0.3V)
Input Current
V
CC
Peak ...........................................................................1.0A
V
CC
Continuous .............................................................500mA
I
BATT
Peak......................................................................250mA
I
BATT
Continuous .............................................................50mA
GND .................................................................................50mA
All Other Inputs ................................................................50mA
Continuous Power Dissipation (T
A
= +70°C)
Plastic DIP (derate 10.53mW/°C above +70°C) ..........842mW
Wide SO (derate 9.52mW/°C above +70°C)................762mW
CERDIP (derate 10.00mW/°C above +70°C)...............800mW
TSSOP (derate 6.70 mW/°C above +70°C) .................533mW
Operating Temperature Ranges
MAX807_C_E ......................................................0°C to +70°C
MAX807_E_E ...................................................-40°C to +85°C
MAX807_MJE ................................................-55°C to +125°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10s) .................................+300°C
V
BATT
= 2.8V, V
CC
= 3.0V
V
CC
= 0V, V
BATT
= 2.8V
V
CC
= 3V, I
OUT
= 100mA
V
CC
= 4.5V,
I
OUT
= 250mA
V
BATT
= 2.0V, I
OUT
= 5mA, V
CC
= 0V
V
BATT
= 2.8V, I
OUT
= 10mA, V
CC
= 0V
V
BATT
= 4.5V, I
OUT
= 20mA, V
CC
= 0V
CONDITIONS
µA
-1.0 1.0
BATT Standby Current (Note 3)
-0.1 0.1
µA
50
Supply Current in Battery-
Backup Mode (excludes I
OUT
)
(Note 2)
5
0.4 1
µA70 110
Supply Current in Normal
Operating Mode (excludes I
OUT
)
V
V
BATT
- 0.20 V
BATT
- 0.08
V
OUT
in Battery-Backup Mode V
BATT
- 0.25 V
BATT
- 0.12
V
BATT
- 0.17
Ω
1.2 2.5
V
CC
to OUT On-Resistance
1.8
1.0 1.4
UNITSMIN TYP MAXSYMBOLPARAMETER
V0 5.5
Operating Voltage Range
V
BATT
, V
CC
(Note 1)
MAX807C/E
MAX807M
V
BATT
= 2.0V, I
OUT
= 5mA
V
BATT
= 2.8V, I
OUT
= 10mA
V
BATT
= 4.5V, I
OUT
= 20mA
Ω
16 40
BATT to OUT On-Resistance 12 25
8.5
T
A
= +25°C
MAX807C/E
MAX807M
T
A
= +25°C
T
A
= T
MIN
to
T
MAX
V
BATT
= 2.8V
Power up
Power down
V
V
BATT
Battery-Switchover Threshold
V
BATT
+ 0.05
V
CC
= 3V, V
BATT
= 2.8V, I
OUT
= 100mA
V
CC
= 4.5V
V
CC
- 0.02I
OUT
= 25mA
I
OUT
= 250mA,
MAX807C/E
I
OUT
= 250mA,
MAX807M
V
OUT
in Normal Operating
Mode
V
V
CC
- 0.25 V
CC
- 0.12
V
CC
- 0.35 V
CC
- 0.22
V
CC
- 0.45
mV
0.1 0.4
Battery-Switchover Hysteresis 50
BATT ON Output, Low Voltage V
RST (max)
, I
SINK
= 3.2mA V
2 2.7BATT ON Output, High Voltage V
CC
= 0V, I
SOURCE
= 0.1mA, V
BATT
= 2.8V V
MAX807L/M/N
Full-Featured µP Supervisory Circuit with
±1.5% Reset Accuracy
_______________________________________________________________________________________ 3
V
IH
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 4.60V to 5.5V for the MAX807L, V
CC
= 4.50V to 5.5V for the MAX807N, V
CC
= 4.35V to 5.5V for the MAX807M,
V
BATT
= 2.8V, V
PFI
= 0V, T
A
= T
MIN
to T
MAX
. Typical values are tested with V
CC
= 5V and T
A
= +25°C, unless otherwise noted.)
CONDITIONS UNITSMIN TYP MAXSYMBOLPARAMETER
Sink current 70
4.600 4.675 4.750
V
5
BATT ON Output
Short-Circuit Current
Source current, V
CC
= 0V, V
BATT
= 2.8V
4.350 4.425 4.500
LOW LINE to RESET
Threshold Voltage
V
LR
Reset Threshold Hysteresis
V
CC
falling 30 52 70 mV
13 mV
4.500 4.575 4.650V
RST
Reset Threshold V
CC
rising and falling
4.63 4.71MAX807N
V
CC
to LOW LINE Delay V
CC
falling at 1mV/µs 24 µs
µs26V
CC
to RESET Delay V
CC
falling at 1mV/µs
4.48 4.56MAX807M
Minimum Watchdog Input
Pulse Width
Watchdog-Timeout Period
V
IL
= 0.8V, V
IH
= 0.75 x V
CC
t
WD
100 ns
V
1.12 1.6 2.24 s
ms140 200 280t
RP
RESET Active-Timeout Period V
CC
rising
4.73 4.81MAX807L
MAX807L
MAX807N
MAX807M
0.3
0.3
I
SINK
= 50µA,
V
BATT
= 0V, V
CC
falling
V
CC
- 1.5 V
CC
- 0.1
RESET Output Voltage
I
SOURCE
= 0.1mA
0.1 0.4I
SINK
= 3.2mA, V
CC
= 4.25V
mA
60Output sink current, V
CC
= 4.25V
1.6
I
SC
RESET Output
Short-Circuit Current
Output source current
V
CC
= 1V,
MAX807_C
V
CC
= 1.2V,
MAX807_E/M
V
0.4I
SINK
= 3.2mA
V
CC
- 1.5
RESET Output Voltage
I
SOURCE
= 5mA
V
0.4I
SINK
= 3.2mA, V
CC
= 4.25V
V
CC
- 1.5
LOW LINE Output Voltage
I
SOURCE
= 5mA
mA
60Output sink current
15
I
SC
RESET Output
Short-Circuit Current
Output source current, V
CC
= 4.25V
mA
28Output sink current, V
CC
= 4.25V
20
I
SC
LOW LINE Output
Short-Circuit Current
Output source current
V
0.4I
SINK
= 3.2mA
V
CC
- 1.5
WDO Output Voltage
I
SOURCE
= 5mA
mA
mA
35Output sink current
20
I
SC
WDO Output
Short-Circuit Current
Output source current
V
LL
V
LOW LINE Threshold,
V
CC
Rising
V
0.75 x V
CC
0.8
V
IH
WDI Threshold Voltage
(Note 4)
V
IL
µA
-50 -10Reset deasserted, WDI = 0V
16 50
WDI Input Current
Reset deasserted, WDI = V
CC
RESET, LOW LINE, AND WATCHDOG TIMER
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

MAX807LCWE+T

Mfr. #:
Buy MAX807LCWE+T
Manufacturer:
Maxim Integrated
Description:
Supervisory Circuits Full-Featured uPower Supervisor
Lifecycle:
New from this manufacturer.
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