MAX801L_05 Datasheet, PDF (1/12 Pages) Maxim Integrated Products – 8-Pin uP Supervisory Circuits with ±1.5% Reset Accuracy

19-1086; Rev 1; 11/05
8-Pin µP Supervisory Circuits
with ±1.5% Reset Accuracy
_______________General Description
The MAX801/MAX808 microprocessor (µP) supervisory
circuits monitor and control the activities of +5V µPs by
providing backup-battery switchover, low-line indica-
tion, and µP reset. Additional features include a watch-
dog for the MAX801 and CMOS RAM write protection
for the MAX808.
The MAX801/MAX808 offer a choice of reset-threshold
voltage (denoted by suffix letter): 4.675V (L), 4.575V
(N), and 4.425V (M). These devices are available in
8-pin DIP and SO packages.
________________________Applications
Computers
Controllers
Intelligent Instruments
Critical µP Power Monitoring
Portable/Battery-Powered Equipment
Embedded Systems
Pin Configurations appear at end of data sheet.
__________Typical Operating Circuit
+5V
0.1μF
0.1μF
V_CC
OUT
BATT
0.1μF
LOWLINE
RESET
MAX808
CE IN
CE OUT
GND
POWER FOR μP
CMOS RAM POWER
NMI
RESET
µP SYSTEM
FROM I/O SYSTEM OR
ADDRESS DECODER
TO CMOS RAM
____________________________Features
♦ Precision Voltage Monitoring, ±1.5% Reset
Accuracy
♦ 200ms Power-OK/Reset Time Delay
♦ RESET Output (MAX808)
RESET and RESET Outputs (MAX801)
♦ Watchdog Timer (MAX801)
♦ On-Board Gating of Chip-Enable Signals (MAX808):
Memory Write-Cycle Completion
3ns CE Gate Propagation Delay
♦ 1µA Standby Current
♦ Power Switching:
250mA in V_CC Mode
20mA in Battery-Backup Mode
♦ MaxCap™/SuperCap™ Compatible
♦ RESET Guaranteed Valid to V_CC = 1V
♦ Low-Line Threshold 52mV Above Reset
Threshold
MaxCap is a trademark of The Carborundum Corp.
SuperCap is a trademark of Baknor Industries.
______________Ordering Information
PART*
TEMP RANGE PIN-PACKAGE
MAX801_CPA
0°C to +70°C
8 Plastic DIP
MAX801_CSA
0°C to +70°C
8 SO
MAX801_EPA
-40°C to +85°C
8 Plastic DIP
MAX801_ESA
-40°C to +85°C
8 SO
MAX801_MJA
-55°C to +125°C 8 CERDIP**
MAX808_CPA
0°C to +70°C
8 Plastic DIP
MAX808_CSA
0°C to +70°C
8 SO
MAX808_EPA
-40°C to +85°C
8 Plastic DIP
MAX808_ESA
-40°C to +85°C
8 SO
MAX808_MJA
-55°C to +125°C 8 CERDIP**
*These parts offer a choice of reset threshold voltage. From the
table below, select the suffix corresponding to the desired thresh-
old and insert it into the blank to complete the part number.
**Contact factory for availability and processing to MIL-STD-883.
Devices in PDIP, SO and µMAX packages are available in both
leaded and lead-free packaging. Specify lead free by adding the
+ symbol at the end of the part number when ordering. Lead free
not available for CERDIP package.
SUFFIX
RESET THRESHOLD (V)
MIN
TYP
MAX
L
4.60
4.675
4.75
N
4.50
4.575
4.65
M
4.35
4.425
4.50
________________________________________________________________ Maxim Integrated Products 1
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.