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| 型号： | ADM697ARZ-REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 7/12页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR MPU 16SOIC |
| 标准包装： | 1,000 |
| 类型： | 备用电池电路 |
| 监视电压数目： | 1 |
| 输出： | 推挽式，推挽式 |
| 复位： | 高有效/低有效 |
| 复位超时： | 最小为 35 ms |
| 电压 - 阀值： | 1.3V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 16-SOIC W |
| 包装： | 带卷 (TR) |
ADM696/ADM697
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.
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.
INPUT
POWER
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.
R1
R2
POWER
FAIL
INPUT
1.3V
ADM69x
PFO
POWER
FAIL
OUTPUT
ADM697
CE IN
LL IN LOW = 0
LL IN OK = 1
CE OUT
Figure 7. Power Fail Comparator
Table II. Input and Output Status In Battery Backup Mode
Signal
Status
Figure 5. Chip Enable Gating
V OUT
(ADM696) V OUT is connected to V BATT via an
internal PMOS switch.
LL
IN
V2
V1
V2
V1
RESET
Logic low.
RESET
Logic high. The open circuit output voltage is
RESET
t 1
t 1
LOW LINE
BATT ON
equal to V OUT .
Logic low.
(ADM696) Logic high. The open circuit voltage
is equal to V OUT .
LOW LINE
CE IN
WDI
WDO
PFI
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
CE
OUT
has no effect on the Power Fail Output.
PFO
Logic low.
t 1 = RESET TIME
V1 = RESET VOLTAGE THRESHOLD LOW
V2 = RESET VOLTAGE THRESHOLD HIGH
HYSTERESIS = V2–V1
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
REV. 0
–7 –
CE IN
CE OUT
OSC IN
OSC SEL
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.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| adm697sq | 制造商:Analog Devices 功能描述: 制造商:Rochester Electronics LLC 功能描述:5V CMOS SUPERVISORS IC - Bulk |
| ADM698 | 制造商:AD 制造商全称:Analog Devices 功能描述:Microprocessor Supervisory Circuits |
| ADM698AN | 功能描述:IC SUPERVISOR MPU 4.65V 8DIP RoHS:否 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 标准包装:400 系列:- 类型:备用电池电路 监视电压数目:1 输出:开路漏极，推挽式 复位:高有效/低有效 复位超时:最小为 35 ms 电压 - 阀值:4.65V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-SOIC（0.295"，7.50mm 宽） 供应商设备封装:16-SOIC W 包装:带卷 (TR) 其它名称:ADM691ARZ-REEL7TR |
| ADM698ANZ | 功能描述:IC SUPERVISOR MPU 4.65V 8DIP RoHS:是 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 其它有关文件:STM6717 View All Specifications 标准包装:1 系列:- 类型:多压监控器 监视电压数目:2 输出:开路漏极或开路集电极 复位:低有效 复位超时:最小为 600 ms 电压 - 阀值:1.11V，3.075V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:Digi-Reel® 产品目录页面:1194 (CN2011-ZH PDF) 其它名称:497-7019-6 |
| ADM698AQ | 制造商:AD 制造商全称:Analog Devices 功能描述:Microprocessor Supervisory Circuits |
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