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參數資料
| 型號： | ADM697 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Microprocessor Supervisory Circuits(微處理器監控電路) |
| 中文描述： | 微處理器監控電路（微處理器監控電路） |
| 文件頁數： | 7/12頁 |
| 文件大小： | 359K |
| 代理商： | ADM697 |
ADM696/ADM697
REV. 0
–7–
Fail Output (
PFO
) goes low when the voltage at PFI is less than
1.3 V. Typically PFI is driven by an external voltage divider
which senses either the unregulated dc input to the system’s 5 V
regulator or the regulated 5 V output. The voltage divider ratio
can be chosen such that the voltage at PFI falls below 1.3 V
several milliseconds before the +5 V power supply falls below
the reset threshold.
PFO
is normally used to interrupt the
microprocessor so that data can be stored in RAM and the shut-
down procedure executed before power is lost.
ADM69x
POWER
FAIL
INPUT
R2
INPUT
POWER
1.3V
PFO
POWER
FAIL
OUTPUT
R1
Figure 7. Power Fail Comparator
Table II. Input and Output Status In Battery Backup Mode
Signal
Status
V
OUT
(ADM696) V
OUT
is connected to V
BATT
via an
internal PMOS switch.
Logic low.
Logic high. The open circuit output voltage is
equal to V
OUT
.
Logic low.
(ADM696) Logic high. The open circuit voltage
is equal to V
OUT
.
WDI is ignored. It is internally disconnected
from the internal pullup resistor and does not
source or sink current as long as its input voltage
is between GND and V
OUT
. The input voltage
does not affect supply current.
Logic high. The open circuit voltage is equal to
V
OUT
.
The Power Fail Comparator is turned off and
has no effect on the Power Fail Output.
Logic low.
CE
IN
is ignored. It is internally disconnected
from its internal pullup and does not source or
sink current as long as its input voltage is be-
tween GND and V
OUT
. The input voltage does
not affect supply current.
Logic high. The open circuit voltage is equal to
V
OUT
.
OSC IN is ignored.
OSC SEL is ignored.
RESET
RESET
LOW LINE
BATT ON
WDI
WDO
PFI
PFO
CE
IN
CE
OUT
OSC IN
OSC SEL
CE Gating and RAM Write Protection (ADM697)
The ADM697 contains memory protection circuitry which
ensures the integrity of data in memory by preventing write
operations when LL
IN
is below the threshold voltage. When
LL
IN
is greater than 1.3 V,
CE
OUT
is a buffered replica of
CE
IN
,
with a 5 ns propagation delay. When LL
IN
falls below the 1.3 V
threshold, an internal gate forces
CE
OUT
high, independent of
CE
IN
.
CE
OUT
typically drives the CE, CS, or Write input of battery
backed up CMOS RAM. This ensures the integrity of the data
in memory by preventing write operations when V
CC
is at an in-
valid level.
If the 5 ns typical propagation delay of
CE
OUT
is excessive, con-
nect
CE
IN
to GND and use the resulting
CE
OUT
to control a
high speed external logic gate.
ADM697
CE
OUT
CE
IN
LL
IN
LOW = 0
LL
IN
OK = 1
Figure 5. Chip Enable Gating
t
1
t
1
= RESET TIME
V1 = RESET VOLTAGE THRESHOLD LOW
V2 = RESET VOLTAGE THRESHOLD HIGH
HYSTERESIS = V2–V1
V2
V2
V1
V1
t
1
LL
IN
LOW LINE
RESET
CE
IN
CE
OUT
Figure 6. Chip Enable Timing
Power Fail Warning Comparator
An additional comparator is provided for early warning of fail-
ure in the microprocessor’s power supply. The Power Fail Input
(PFI) is compared to an internal +1.3 V reference. The Power
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| ADM697AN | Microprocessor Supervisory Circuits |
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相關代理商/技術參數 |
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| ADM697AN | 功能描述:IC SUPERVISOR MPU 100MA 16DIP RoHS:否 類別:集成電路 (IC) >> PMIC - 監控器 系列:- 標準包裝:1 系列:- 類型:簡單復位/加電復位 監視電壓數目:1 輸出:開路漏極或開路集電極 復位:高有效 復位超時:- 電壓 - 閥值:1.8V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:6-TSOP（0.059"，1.50mm 寬）5 引線 供應商設備封裝:5-TSOP 包裝:剪切帶 (CT) 其它名稱:NCP301HSN18T1GOSCT |
| ADM697ANZ | 功能描述:IC SUPERVISOR MPU 16DIP RoHS:是 類別:集成電路 (IC) >> PMIC - 監控器 系列:- 其它有關文件:STM6717 View All Specifications 標準包裝:1 系列:- 類型:多壓監控器 監視電壓數目:2 輸出:開路漏極或開路集電極 復位:低有效 復位超時:最小為 600 ms 電壓 - 閥值:1.11V，3.075V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應商設備封裝:SOT-23-5 包裝:Digi-Reel® 產品目錄頁面:1194 (CN2011-ZH PDF) 其它名稱:497-7019-6 |
| ADM697AQ | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ADM697AR | 功能描述:IC SUPERVISOR MPU 100MA 16SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 監控器 系列:- 標準包裝:1 系列:- 類型:簡單復位/加電復位 監視電壓數目:1 輸出:開路漏極或開路集電極 復位:高有效 復位超時:- 電壓 - 閥值:1.8V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:6-TSOP（0.059"，1.50mm 寬）5 引線 供應商設備封裝:5-TSOP 包裝:剪切帶 (CT) 其它名稱:NCP301HSN18T1GOSCT |
| ADM697AR-REEL | 制造商:Analog Devices 功能描述:Processor Supervisor Adj 3V to 5.5V 16-Pin SOIC W T/R 制造商:Analog Devices 功能描述:PROCESSOR SUPERVISOR ADJV 1950UA 16SOIC W - Tape and Reel 制造商:Analog Devices 功能描述:Power Supply Supervisor Circuit, 16 Pin, Plastic, SOP |
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