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DS1238AN-5 PDF预览

DS1238AN-5

更新时间： 2024-11-15 07:36:35
品牌 Logo 应用领域
达拉斯 - DALLAS 光电二极管
页数 文件大小 规格书
13页 159K
描述
Power Supply Management Circuit, Fixed, 1 Channel, PDIP16, 0.300 INCH, DIP-16

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DS1238AN-5 数据手册

 浏览型号DS1238AN-5的Datasheet PDF文件第2页浏览型号DS1238AN-5的Datasheet PDF文件第3页浏览型号DS1238AN-5的Datasheet PDF文件第4页浏览型号DS1238AN-5的Datasheet PDF文件第5页浏览型号DS1238AN-5的Datasheet PDF文件第6页浏览型号DS1238AN-5的Datasheet PDF文件第7页 
DS1238A  
DS1238A  
MicroManager  
FEATURES  
PIN ASSIGNMENT  
VBAT  
16  
RST  
RST  
• Holds microprocessor in check during power  
1
transients  
15  
VCCO  
VCC  
2
3
4
5
6
7
8
• Halts and restarts an out-of-control microprocessor  
• Warns microprocessor of an impending power failure  
• Converts CMOS SRAM into nonvolatile memory  
14  
13  
12  
WDS  
16  
15  
VBAT  
VCCO  
VCC  
GND  
PF  
1
2
3
RST  
GND  
CEI  
RST  
14  
13  
WDS  
CEO  
PF  
RVT  
4
5
CEI  
CEO  
ST  
ST  
12  
11  
• Unconditionally write protects memory when power  
supply is out of tolerance  
6
7
RVT  
11  
10  
OSCIN  
OSCSEL  
NMI  
10  
9
OSCIN  
NMI  
IN  
9
• Delays write protection until completion of the current  
memory cycle  
IN  
8
OSCSEL  
16-Pin SOIC (300 Mil.)  
See Mech. Drawings  
Section  
16-Pin DIP (300 Mil.)  
See Mech. Drawings  
Section  
• Consumes less than 200 nA of battery current  
PIN DESCRIPTION  
• Controls external power switch for high current  
V
BAT  
V
CCO  
V
CC  
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
+3 Volt Battery Input  
Switched SRAM Supply Output  
+5 Volt Power Supply Input  
Ground  
applications  
• Debounces pushbutton reset  
GND  
PF  
• Accurate 10% power supply monitoring  
Power Fail  
• Optional 5% power supply monitoring designated  
DS1238A-5  
RVT  
OSCIN  
OSCSEL  
IN  
NMI  
ST  
Reset Voltage Threshold  
Oscillator In  
Oscillator Select  
Early Warning Input  
Non–Maskable Interrupt  
Strobe Input  
• Provides orderly shutdown in microprocessor appli-  
cations  
• Pin-for-pin compatible with MAX691  
CEO  
CEI  
WDS  
RST  
RST  
Chip Enable Output  
Chip Enable Input  
Watchdog Status  
Reset Output (active low)  
Reset Output (active high)  
• Standard 16-pin DIP or space-saving 16-pin SOIC  
• Optionalindustrial temperature range -40°C to +85°C  
DESCRIPTION  
The DS1238A MicroManager provides all the neces-  
sary functions for power supply monitoring, reset con-  
trol, and memory backup in microprocessor-based sys-  
byapushbuttonresetdebouncecircuitconnectedtothe  
RST pin. An internal watchdog timer can also force the  
reset outputs to the active state if the strobe input is not  
driven low prior to watchdog timeout. Oscillator control  
pins OSCSEL and OSCIN provide either external or in-  
ternal clock timing for both the reset pulse width and the  
watchdog timeout period. The Watchdog Status and  
Reset Voltage Threshold are provided via WDS and  
RVT, respectively. A block diagram of the DS1238A is  
shown in NO TAG.  
tems.  
A precise internal voltage reference and  
comparator circuit monitor power supply status. When  
an out-of-tolerance condition occurs, the microproces-  
sor reset and power fail outputs are forced active, and  
static RAM control unconditionally write protects exter-  
nal memory. The DS1238A also provides early warning  
detection of a user-defined threshold by driving a non-  
maskable interrupt. External reset control is provided  
022698 1/13  
1234567...13

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