MAX791 Maxim, MAX791 Datasheet
MAX791
Manufacturer Part Number
MAX791
Description
Microprocessor Supervisory Circuit
Manufacturer
Maxim
Datasheet
1.MAX791.pdf
(20 pages)
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The MAX791 microprocessor (µP) supervisory circuit
reduces the complexity and number of components need-
ed to monitor power-supply and battery-control functions
in µP systems. The 50µA supply current makes the
MAX791 ideal for use in portable equipment, while the 6ns
chip-enable propagation delay and 250mA output capa-
bility (25mA in battery-backup mode) make it suitable for
larger, higher-performance equipment.
The MAX791 comes in 16-pin DIP and narrow SO pack-
ages and provides the following functions:
6) Software monitoring of backup-battery voltage.
1) µP reset—
2) Manual-reset input.
3) A 1.25V threshold detector provides for power-fail
4) Two-stage power-fail warning—a separate low-line
5) Backup-battery switchover for CMOS RAM, real-time
7) A watchdog-fault output is asserted if the watchdog
8) Write protection of CMOS RAM or EEPROM.
9) Pulsed watchdog output, to give advance warning of
________________________Applications
19-0075; Rev. 5; 7/95
_____________________
Call toll free 1-800-998-8800 for free samples or literature.
__________________Pin Configuration
Computers
Controllers
Portable/Battery-Powered Equipment
MaxCap is a registered trademark of The Carborundum Corp.
power-down, and brownout conditions, and is guaran-
teed to be in the correct state for V
even with no battery in the circuit.
warning and low-battery detection, or monitors a
power supply other than +5V.
comparator compares V
above the reset threshold.
clocks, µPs, or other low-power logic.
input has not been toggled within either a preset or
an adjustable timeout period.
impending
TOP VIEW
BATT ON
–
R
—
–
W
—
VBATT
E
—
V
D
GND
SWT
PFO
S
—
V
OUT
—
PFI
CC
O
E
—
–
________________________________________________________________ Maxim Integrated Products
–
T
assertion caused by watchdog timeout.
1
2
3
4
5
6
7
8
output is asserted during power-up,
General Description
MAX791
DIP/SO
Critical µP Power Monitoring
Intelligent Instruments
CC
Microprocessor Supervisory Circuit
to a threshold 150mV
16
15
14
13
12
11
10
9
WDPO
RESET
WDO
WDI
LOWLINE
MR
CE IN
CE OUT
CC
down to 1V,
SuperCap is a registered trademark of Baknor Industries.
____________________________Features
* Dice are specified at T
__________Typical Operating Circuit
RESET SOURCES
OTHER SYSTEM
______________Ordering Information
MAX791CPE
MAX791CSE
MAX791C/D
MAX791EPE
MAX791ESE
MAX791EJE
MAX791MJE
Precision 4.65V Voltage Monitoring
200ms Power-OK / Reset Time Delay
Independent Watchdog Timer—Preset or Adjustable
1µA Standby Current
Power Switching
On-Board Gating of Chip-Enable Signals
MaxCap
Voltage Monitor for Power-Fail or Low-Battery Warning
Backup-Battery Monitor
Guaranteed
* MaxCap
+5V
0.1 F
PART
250mA Output in V
25mA Output in Battery-Backup Mode
Memory Write-Cycle Completion
6ns CE Gate Propagation Delay
0.47F*
+12V
+12V SUPPLY
‰
FAILURE
or SuperCap
–
R
—
E
—
S
—
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
E
V
VBATT
MR
PFI
PFO
—
TEMP. RANGE
GND
CC
0°C to +70°C
0°C to +70°C
0°C to +70°C
T
–
A
MAX791
= +25°C.
Valid to V
BATT
ON
CC
‰
LOWLINE
CE OUT
Compatible
RESET
Mode
CE IN
WDO
V
SWT
WDI
OUT
CC
ADDRESS
DECODE
= 1V
0.1 F
16 Plastic DIP
16 Narrow SO
Dice*
16 Plastic DIP
16 Narrow SO
16 CERDIP
16 CERDIP
PIN-PACKAGE
I/O
NMI
RESET
INT
A0–A15
P
CMOS
RAM
1
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