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MAX6854

更新时间: 2024-09-24 11:15:07
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美信 - MAXIM 监控
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17页 788K
描述
Nanopower uP Supervisory Circuits with Manual Reset and Watchdog Timer

MAX6854 数据手册

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19-3139; Rev 2; 9/04  
Nanopower µP Supervisory Circuits with  
Manual Reset and Watchdog Timer  
General Description  
Features  
The MAX6854/MAX6855/MAX6856/MAX6858/MAX6860–  
MAX6869 ultra-low-current (170nA, typ) microprocessor  
(µP) supervisory circuits combine voltage monitoring,  
watchdog timer, and manual reset input functions in a 5-  
pin SOT23 package. These devices assert a reset signal  
whenever the monitored voltage drops below the factory-  
trimmed reset threshold voltage, manual reset is assert-  
ed, or the watchdog timer expires. The reset output  
Ultra-Low 170nA (typ) Supply Current  
Reset Thresholds from +1.575V to +4.625V in  
Approximately 100mV Increments  
Six Minimum Reset Timeout Period Options from  
10ms to 1200ms  
Manual Reset Option  
Watchdog Timer Option  
remains asserted for a minimum timeout period after V  
CC  
Pin-Selectable 10ms/150ms (min) Reset Timeout  
rises above the reset threshold and manual reset is  
deasserted. Factory-trimmed reset threshold voltages  
are offered from +1.575V to +4.625V in approximately  
100mV increments (see Threshold Suffix Guide). Each  
device is offered with six minimum reset timeout options,  
ranging from 10ms to 1200ms.  
Period (MAX6861/MAX6862/MAX6863)  
Immune to Short VCC Transients  
Guaranteed Reset Valid to VCC = +1.1V  
Three Reset Output Options:  
Push-Pull RESET  
The MAX6854/MAX6855/MAX6856/MAX6858/MAX6860–  
MAX6869 are offered in a variety of configurations (see  
the Selector Guide). The MAX6854/MAX6855/MAX6856/  
MAX6861–MAX6869 provide a manual reset input, MR.  
The MAX6864–MAX6869 offer a watchdog timer that  
monitors activity at the WDI input to prevent code execu-  
tion errors. The MAX6864–MAX6869 offer watchdog  
timeout options of 3.3s or 209s (typ). The MAX6861/  
MAX6862/MAX6863 feature a pin-selectable reset delay  
period of 10ms or 150ms (min). Push-pull active-low,  
push-pull active-high, and open-drain active-low reset  
outputs are available.  
Push-Pull RESET  
Open-Drain RESET  
No External Components  
Small 5-Pin SOT23 Package  
Pin Compatible to the TPS3836/TPS3837/TPS3838  
(MAX6861/MAX6862/MAX6863)  
Ordering Information  
PART  
TEMP RANGE PIN-PACKAGE  
-40°C to +85°C 5 SOT23-5  
-40°C to +85°C 5 SOT23-5  
Applications  
Portable/Battery-Powered Equipment  
MAX6854UK_ _D_-T  
MAX6855UK_ _D_-T  
PDAs/Cell Phones  
Insert reset threshold suffix (see Table 2, Threshold Suffix  
Guide) after UK. Insert the number corresponding to the  
desired reset timeout period (see Table 4, Reset Timeout  
Period) after D.  
MP3 Players/Pagers  
Glucose Monitors/Patient Monitors  
Note: Sample stock is generally held on standard versions  
only (see Table 5, Standard Versions Table). Standard versions  
have an order increment of 2500 pieces. Nonstandard versions  
have an order increment of 10,000 pieces. Contact factory for  
availability of nonstandard versions.  
Typical Operating Circuit  
V
CC  
0.1µF  
V
V
CC  
CC  
Pin Configurations appear at end of data sheet.  
Selector Guide appears at end of data sheet.  
Ordering Information continued at end of data sheet.  
RESET  
RESET  
µP  
MAX6864  
MAX6867  
MR  
I/O  
WDI  
MANUAL  
RESET  
GND  
GND  
________________________________________________________________ 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.  

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