參數(shù)資料
型號(hào)： ADM800MAN
廠商： ANALOG DEVICES INC
元件分類： 電源管理
英文描述： Microprocessor Supervisory Circuits
中文描述： 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDIP16
封裝： PLASTIC, DIP-16
文件頁(yè)數(shù)： 1/12頁(yè)
文件大?。?/td> 337K
代理商： ADM800MAN
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.
a
ADM691A/ADM693A/ADM800L/M
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
World Wide Web Site: http://www.analog.com
Fax: 617/326-8703
Analog Devices, Inc., 1996
Microprocessor
Supervisory Circuits
FUNCTIONAL BLOCK DIAGRAM
COUTPUT
CONTROL
V
BATT
V
CC
CE
IN
OSC IN
OSC SEL
WATCHDOG
INPUT (WDI)
POWER FAIL
INPUT (PFI)
1
VOLTAGE DETECTOR = 4.4V (ADM693A/ADM800M)
ADM691A/ADM693A
ADM800L/ADM800M
1.25V
WATCHDOG
TIMER
RESET &
WATCHDOG
TIMEBASE
RESET &
GENERATOR
4.65V
1
BATT ON
LOW LINE
V
OUT
CE
OUT
RESET
RESET
WATCHDOG
OUTPUT (
WDO
)
POWER FAIL
OUTPUT (
PFO
)
WATCHDOG
TRANSITION DETECTOR
FEATURES
Low Power Consumption:
Precision Voltage Monitor
6
2% Tolerance on ADM800L/M
Reset Time Delay—200 ms, or Adjustable
1
m
A Standby Current
Automatic Battery Backup Power Switching
Fast Onboard Gating of Chip Enable Signals
Also Available in TSSOP Package (ADM691A)
APPLICATIONS
Microprocessor Systems
Computers
Controllers
Intelligent Instruments
Automotive Systems
Critical
m
P Power Monitoring
GENERAL DESCRIPTION
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
μ
P 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.
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:
1. Power-on reset output during power-up, power-down and
brownout conditions. The circuitry remains operational with
V
CC
as low as 1 V.
2. Battery backup switching for CMOS RAM, CMOS micro-
processor or other low power logic.
3. A reset pulse if the optional watchdog timer has not been
toggled within a specified time.
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.
V
BATT
V
CC
CMOS
RAM
CE
IN
OSC IN
OSC SEL
BAT
ON
LOW LINE
V
OUT
CE
OUT
RESET
RESET
PFO
WDI
V
CC
WDO
I/O LINE
NMI
A0–A15
μP
POWER
μP
ADDRESS
DECODE
ADM691A
ADM693A
ADM800L
ADM800M
GND
PFI
BATTERY
0.1μF
+5V
NC
R2
R1
INPUT
POWER
7805
SYSTEM
STATUS
INDICATORS
Figure 1. Typical Application
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