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| 型号： | LTC693CSW#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/20页 |
| 文件大小： | 0K |
| 描述： | IC MPU SUPERVISRY CIRCUIT 16SOIC |
| 标准包装： | 47 |
| 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/低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 4.4V |
| 工作温度： | 0°C ~ 70°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 |
| 包装： | 管件 |
LTC692/LTC693
APPLICATIONS INFORMATION
5V
0.1μF
V CC V OUT
LTC693
+
10μF
0.1μF
V CC
62512
RAM
3V
V BATT
CE OUT
CE IN
RESET
20ns PROPAGATION DELAY
FROM DECODER
CS
GND
692_3 ? F06
GND
RESET
TO μP
Figure 6. A Typical Nonvolatile CMOS RAM Application
5V
0.1μF
V CC
V OUT
+
10μF
0.1μF
V CC
62128
LTC692
CS
CS1
RAM
V BATT
RESET
CS2
3V
GND
GND
692_3 ? F07
Figure 7. Write-Protect for RAM with the LTC692
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
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 H = 1.3V ? 1+
(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
?
?
R1
R2
+
R1 ?
R3 ? ?
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
When PFO output is high, the series combination of R3
and R4 source current into the PFI summing junction.
V L = 1.3V ? 1 +
R2 1.3V(R3 + R4) ? ?
microprocessortoexecuteshutdownprocedurebetween
PFO and RESET or RESET.
?
?
R1 (5V – 1.3V)R1 ?
–
Asssuming?R4 << R3,V HYSTERESIS = 5V
R1
R3
0692fb
12
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相关代理商/技术参数 |
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| LTC693I | 制造商:LINER 制造商全称:Linear Technology 功能描述:Microprocessor Supervisory Circuits |
| LTC693IN | 制造商:LINER 制造商全称:Linear Technology 功能描述:Microprocessor Supervisory Circuits |
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