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參數(shù)資料
| 型號(hào)： | LTC692CN8#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDIP8 |
| 封裝： | 0.300 INCH, PLASTIC, DIP-8 |
| 文件頁數(shù)： | 4/20頁 |
| 文件大?。?/td> | 244K |
| 代理商： | LTC692CN8#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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| LTC692CS8#TR | 功能描述:IC SUPERVISORY CIRCUIT MPU 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 類型:簡(jiǎn)單復(fù)位/加電復(fù)位 監(jiān)視電壓數(shù)目:1 輸出:開路漏極或開路集電極 復(fù)位:高有效 復(fù)位超時(shí):- 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(yīng)商設(shè)備封裝:5-TSOP 包裝:剪切帶 (CT) 其它名稱:NCP301HSN18T1GOSCT |
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| LTC692CS8-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Microprocessor Supervisory Circuits |
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