MAX792 Maxim, MAX792 Datasheet
MAX792
Manufacturer Part Number
MAX792
Description
Microprocessor and Non-Volatile Memory Supervisory Circuits
Manufacturer
Maxim
Datasheet
1.MAX792.pdf
(16 pages)
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The MAX792/MAX820 microprocessor (µP) supervisory
circuits provide the most functions for power-supply
and watchdog monitoring in systems without battery
backup. Built-in features include the following:
1) µP reset: Assertion of RESET and RESET outputs dur-
2) Manual-reset input.
3) Two-stage power-fail warning: A separate low-line
4) Watchdog fault output: Assertion of WDO if the watch-
5) Pulsed watchdog output: Advance warning of
6) Write protection of CMOS RAM, EEPROM, or other
The MAX792 and MAX820 are identical, except the
MAX820 guarantees higher low-line and reset threshold
accuracy (±2%).
19-0147; Rev. 2; 6/98
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
ing power-up, power-down, and brownout condi-
tions. RESET is guaranteed valid for V
comparator compares V
120mV above the reset threshold; the low-line and
reset thresholds can be programmed externally.
dog input is not toggled within a preset timeout
period.
impending WDO assertion from watchdog timeout
that causes hardware shutdown.
memory devices.
Computers
Controllers
Intelligent Instruments
Critical µP Power Monitoring
V
CC
________________________________________________________________ Maxim Integrated Products
General Description
CC
to a preset threshold
4
8
5
7
Applications
Microprocessor and Non-Volatile
RESET IN/INT
LLIN/
REFOUT
OVI
SWT
CC
MAX792
down to 1V.
V
GND
CC
12
3
LOW LINE
Memory Supervisory Circuits
CE OUT
RESET
CE IN
OVO
MR
1
13
14
10
6
9
DECODER
ADDRESS
0.1µF
Ordering Information continued at end of data sheet.
* Dice are tested at T
**These parts offer a choice of five different reset threshold volt-
ages. Select the letter corresponding to the desired nominal
reset threshold voltage and insert it into the blank to complete the
part number.
MAX792_CPE
MAX792_CSE
MAX792_C/D
Manual-Reset Input
200ms Power-OK / Reset Time Delay
Independent Watchdog Timer—Preset or Adjustable
On-Board Gating of Chip-Enable Signals
Memory Write-Cycle Completion
10ns (max) Chip-Enable Gate Propagation Delay
Voltage Monitor for Overvoltage Warning
±2% Reset and Low-Line Threshold Accuracy
(MAX820, external programming mode)
PART**
SUFFIX
M
L
T
S
R
Typical Operating Circuit
RAM
A
TEMP. RANGE
= +25°C, DC parameters only.
0°C to +70°C
0°C to +70°C
0°C to +70°C
Ordering Information
A0-A15
NMI
RESET
V
GND
CC
P
RESET THRESHOLD (V)
16 Plastic DIP
16 Narrow SO
Dice*
PIN-PACKAGE
4.62
4.37
3.06
2.91
2.61
Features
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