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ADM693A_15

更新时间： 2024-01-23 04:43:50
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亚德诺 - ADI /
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12页 344K
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Microprocessor Supervisory Circuits

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ADM693A_15 数据手册

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Microprocessor  
a
Supervisory Circuits  
ADM691A/ADM693A/ADM800L/M  
FUNCTIONAL BLOCK DIAGRAM  
FEATURES  
Low Power Consumption:  
Precision Voltage Monitor  
BATT ON  
؎2% Tolerance on ADM800L/M  
Reset Time Delay—200 ms, or Adjustable  
1 ␮A Standby Current  
1
4.65V  
LOW LINE  
V
CC  
Automatic Battery Backup Power Switching  
Fast Onboard Gating of Chip Enable Signals  
Also Available in TSSOP Package (ADM691A)  
V
OUT  
V
BATT  
CHIP ENABLE  
OUTPUT  
CONTROL  
APPLICATIONS  
Microprocessor Systems  
Computers  
CE  
OUT  
CE  
IN  
Controllers  
Intelligent Instruments  
Automotive Systems  
Critical ␮P Power Monitoring  
RESET &  
WATCHDOG  
TIMEBASE  
OSC IN  
RESET &  
GENERATOR  
RESET  
OSC SEL  
RESET  
WATCHDOG  
WATCHDOG  
TRANSITION DETECTOR  
WATCHDOG  
TIMER  
WATCHDOG  
INPUT (WDI)  
OUTPUT (WDO)  
POWER FAIL  
INPUT (PFI)  
GENERAL DESCRIPTION  
POWER FAIL  
1.25V  
OUTPUT (PFO)  
The ADM691A/ADM693A/ADM800L/ADM800M family of  
supervisory circuits offers complete single chip solutions for  
power supply monitoring and battery control functions in  
microprocessor systems. These functions include µP reset,  
backup-battery switchover, watchdog timer, CMOS RAM write  
protection, and power-failure warning. The family of products  
provides an upgrade for the MAX691A/93A/800M family of  
products.  
ADM691A/ADM693A  
ADM800L/ADM800M  
1
VOLTAGE DETECTOR = 4.4V (ADM693A/ADM800M)  
INPUT  
POWER  
+5V  
All parts are available in 16-pin DIP and SO packages. The  
ADM691A is also available in a space-saving TSSOP package.  
The following functionality is provided:  
7805  
0.1µF  
V
CC  
CMOS  
RAM  
V
V
BAT  
ON  
OUT  
1. Power-on reset output during power-up, power-down and  
brownout conditions. The circuitry remains operational with  
CC  
V
BATT  
ADDRESS  
DECODE  
CE  
BATTERY  
OUT  
R1  
R2  
CE  
ADM691A  
ADM693A  
ADM800L  
ADM800M  
IN  
V
CC as low as 1 V.  
A0–A15  
µP  
POWER  
PFI  
GND  
2. Battery backup switching for CMOS RAM, CMOS micro-  
processor or other low power logic.  
WDI  
PFO  
I/O LINE  
NMI  
OSC IN  
µP  
NC  
RESET  
RESET  
OSC SEL  
3. A reset pulse if the optional watchdog timer has not been  
toggled within a specified time.  
WDO  
LOW LINE  
4. A 1.25 V threshold detector for power fail warning, low bat-  
tery detection, or to monitor a power supply other than +5 V.  
SYSTEM  
STATUS  
INDICATORS  
Figure 1. Typical Application  
REV. 0  
Information furnished by Analog Devices is believed to be accurate and  
reliable. However, no responsibility is assumed by Analog Devices for its  
use, nor for any infringements of patents or other rights of third parties  
which may result from its use. No license is granted by implication or  
otherwise under any patent or patent rights of Analog Devices.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 617/329-4700  
Fax: 617/326-8703  
World Wide Web Site: http://www.analog.com  
© Analog Devices, Inc., 1996  
1234567...12

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