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参数资料
| 型号： | LTC693CS#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| 封装： | 0.300 INCH, PLASTIC, SOP-16 |
| 文件页数： | 4/20页 |
| 文件大小： | 244K |
| 代理商： | LTC693CS#TRPBF |
LTC692/LTC693
12
0692fb
Power-Fail Warning
The LTC692/LTC693 generate a power failure output
(PFO) for early warning of failure in the microprocessor’s
power supply. This is accomplished by comparing the
power failure input (PFI) with an internal 1.3V reference.
PFO goes low when the voltage at the PFI pin is less than
1.3V. Typically PFI is driven by an external voltage divider
(R1 and R2 in Figures 8 and 9) which senses either an
unregulated DC input or a regulated 5V output. The volt-
age divider ratio can be chosen such that the voltage at
the PFI pin falls below 1.3V, several milliseconds before
the 5V supply falls below the maximum reset voltage
threshold of 4.50V. PFO is normally used to interrupt the
microprocessor to execute shutdown procedure between
PFO and RESET or RESET.
APPLICATIONS INFORMATION
5V
3V
0.1μF
10μF
VBATT
VCC
LTC693
VOUT
GND
692_3 F06
VCC
RESET
CE IN
CE OUT
RESET
0.1μF
TO μP
FROM DECODER
CS
20ns PROPAGATION DELAY
62512
RAM
GND
+
5V
3V
0.1μF
10μF
VBATT
VCC
LTC692
VOUT
GND
692_3 F07
VCC
RESET
0.1μF
CS
62128
RAM
CS1
CS2
GND
+
Figure 6. A Typical Nonvolatile CMOS RAM Application
Figure 7. Write-Protect for RAM with the LTC692
The power-fail comparator, C3, does not have hysteresis.
Hysteresis can be added however, by connecting a resistor
between the PFO output and the noninverting PFI input
pin as shown in Figures 8 and 9. The upper and lower trip
points in the comparator are established as follows:
When PFO output is low, R3 sinks current from the sum-
ming junction at the PFI pin.
V = 1.3V 1+
R1
R2
R1
R3
H
+
When PFO output is high, the series combination of R3
and R4 source current into the PFI summing junction.
V
1.3V 1
R1
R2
–
(5V – 1.3V)R1
1.3V(R3 R4)
L =+
+
AsssumingR4
R3,V
5V
R1
R3
HYSTERESIS
<<
=
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC693CSW | 功能描述:IC MPU SUPERVISRY CIRCUIT 16SOIC RoHS:否 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 |
| LTC693CSW#PBF | 功能描述:IC MPU SUPERVISRY CIRCUIT 16SOIC 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 |
| LTC693CSW#TR | 功能描述:IC SUPERVISORY CIRC MPU 16SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 标准包装:1 系列:- 类型:简单复位/加电复位 监视电压数目:1 输出:开路漏极或开路集电极 复位:高有效 复位超时:- 电压 - 阀值:1.8V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:6-TSOP（0.059"，1.50mm 宽）5 引线 供应商设备封装:5-TSOP 包装:剪切带 (CT) 其它名称:NCP301HSN18T1GOSCT |
| LTC693CSW#TRPBF | 功能描述:IC MPU SUPERVISRY CIRCUIT 16SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 标准包装:1 系列:- 类型:简单复位/加电复位 监视电压数目:1 输出:开路漏极或开路集电极 复位:高有效 复位超时:- 电压 - 阀值:1.8V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:6-TSOP（0.059"，1.50mm 宽）5 引线 供应商设备封装:5-TSOP 包装:剪切带 (CT) 其它名称:NCP301HSN18T1GOSCT |
| LTC693I | 制造商:LINER 制造商全称:Linear Technology 功能描述:Microprocessor Supervisory Circuits |
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