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參數資料
| 型號： | MAX824ZEXK-T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | Analog IC |
| 中文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO5 |
| 封裝： | SC-70, 5 PIN |
| 文件頁數： | 1/16頁 |
| 文件大小： | 272K |
| 代理商： | MAX824ZEXK-T |
M
Microprocessor and Nonvolatile
Memory Supervisory Circuits
________________________________________________________________
Maxim Integrated Products
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
1
19-0147; Rev. 3; 4/00
General Description
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:
μP reset: Assertion of RESET and
RESET
outputs during
power-up, power-down, and brownout conditions.
RESET
is guaranteed valid for V
CC
down to 1V.
Manual-reset input.
Two-stage power-fail warning: A separate low-line
comparator compares V
CC
to a preset threshold
120mV above the reset threshold; the low-line and
reset thresholds can be programmed externally.
Watchdog fault output: Assertion of
WDO
if the watchdog
input is not toggled within a preset timeout
period.
Pulsed watchdog output: Advance warning of
impending
WDO
assertion from watchdog timeout that
causes hardware shutdown.
Write protection of CMOS RAM, EEPROM, or other
memory devices.
The MAX792 and MAX820 are identical, except the
MAX820 guarantees higher low-line and reset threshold
accuracy (±2%).
Applications
Computers
Controllers
Intelligent Instruments
Critical μP Power Monitoring
Features
o
Manual-Reset Input
o
200ms Power-OK/Reset Time Delay
o
Independent Watchdog Timer—Preset or Adjustable
o
On-Board Gating of Chip-Enable Signals
o
Memory Write-Cycle Completion
o
10ns (max) Chip-Enable Gate Propagation Delay
o
Voltage Monitor for Overvoltage Warning
o
±2% Reset and Low-Line Threshold Accuracy
(MAX820, external programming mode)
Ordering Information continued at end of data sheet.
* Dice are tested at T
A
= +25°C, DC parameters only.
**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.
SUFFIX
L
M
T
S
R
MAX792
4
5
7
8
9
1
10
6
14
ADDRESS
DECODER
RESET IN/INT
LLIN/
REFOUT
OVI
SWT
3
V
CC
GND
12
MR
RESET
LOW LINE
OVO
CE IN
CE OUT
0.1μF
V
CC
RAM
A0-A15
V
CC
GND
NMI
RESET
μ
P
13
Typical Operating Circuit
PART**
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
PIN-PACKAGE
16 Plastic DIP
16 Narrow SO
Dice*
MAX792
_CPE
MAX792_CSE
MAX792_C/D
RESET THRESHOLD (V)
4.62
4.37
3.06
2.91
2.61
Ordering Information
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