參數(shù)資料
型號(hào)： LTC694C-3.3
廠商： Linear Technology Corporation
英文描述： 3.3V Microprocessor Supervisory Circuits
中文描述： 3.3微處理器監(jiān)控電路
文件頁(yè)數(shù)： 8/16頁(yè)
文件大?。?/td> 141K
代理商： LTC694C-3.3
8
LTC 690/LTC 691
LTC 694/LTC 695
U
S
A
Microprocessor Reset
O
PPLICATI
W
U
I FOR ATIO
U
the reset voltage threshold, LOW LINE goes low. LOW
LINE returns high as soon as V
CC
rises above the reset
voltage threshold.
Battery Switchover
The battery switchover circuit compares V
CC
to the V
BATT
input, and connects V
OUT
to whichever is higher. When
V
CC
rises to 70mV above V
BATT
, the battery switchover
comparator, C2, connects V
OUT
to V
CC
through a charge
pumped NMOS power switch, M1. When V
CC
falls to
50mV above V
BATT
, C2 connects V
OUT
to V
BATT
through a
PMOS switch, M2. C2 has typically 20mV of hysteresis to
prevent spurious switching when V
CC
remains nearly
equal to V
BATT
. The response time of C2 is approximately
20
μ
s.
During normal operation, the LTC690 family uses a charge
pumped NMOS power switch to achieve low dropout and
low supply current. This power switch can deliver up to
50mA to V
OUT
from V
CC
and has a typical on resistance of
5
. The V
OUT
pin should be bypassed with a capacitor of
0.1
μ
F or greater to ensure stability. Use of a larger bypass
capacitor is advantageous for supplying current to heavy
transient loads.
When operating currents larger than 50mA are required
from V
OUT
, or a lower dropout (V
CC
-V
OUT
voltage differen-
tial) is desired, the LTC691 and LTC695 should be used.
These products provide BATT ON output to drive the base
The LTC690 family uses a bandgap voltage reference and
a precision voltage comparator C1 to monitor the 5V
supply input on V
CC
(see Block Diagram). When V
CC
falls
below the reset voltage threshold, the RESET output is
forced to active low state. The reset voltage threshold
accounts for a 5% variation on V
CC
, so the RESET output
becomes active low when V
CC
falls below 4.75V (4.65V
typical). On power-up, the RESET signal is held active low
for a minimum of 35ms for the LTC690/LTC691 (140ms
for the LTC694/LTC695) after reset voltage threshold is
reached to allow the power supply and microprocessor to
stabilize. The reset active time is adjustable on the LTC691/
LTC695. On power-down, the RESET signal remains ac-
tive low even with V
CC
as low as 1V. This capability helps
hold the microprocessor in stable shutdown condition.
Figure 1 shows the timing diagram of the RESET signal.
The precision voltage comparator, C1, typically has 40mV
of hysteresis which ensures that glitches at V
CC
pin do not
activate the RESET output. Response time is typically
10
μ
s. To help prevent mistriggering due to transient loads,
V
CC
pin should be bypassed with a 0.1
μ
F capacitor with the
leads trimmed as short as possible.
The LTC691 and LTC695 have two additional outputs:
RESET and LOW LINE. RESET is an active high output and
is the inverse of RESET. LOW LINE is the output of the
precision voltage comparator C1. When V
CC
falls below
V
CC
t
1
t
1
= RESET ACTIVE TIME
V1 = RESET VOLTAGE THRESHOLD
V2 = RESET VOLTAGE THRESHOLD +
RESET THRESHOLD HYSTERESIS
t
1
V2
V2
V1
V1
690 F01
RESET
LOW LINE
Figure 1. Reset Active Time
相關(guān)PDF資料
PDF描述
LTC690CN8 Microprocessor Supervisory Circuits
LTC690CS8 Microprocessor Supervisory Circuits
LTC690I Microprocessor Supervisory Circuits
LTC690IS8 Microprocessor Supervisory Circuits
LTC694C Microprocessor Supervisory Circuits
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC694CN-3.3 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Power Supply Supervisor
LTC694CN8 功能描述:IC MPU SUPERVISORY CIRCUIT 8-DIP RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 類(lèi)型:簡(jiǎn)單復(fù)位/加電復(fù)位 監(jiān)視電壓數(shù)目:1 輸出:開(kāi)路漏極或開(kāi)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(lèi)型:表面貼裝 封裝/外殼:6-TSOP（0.059"，1.50mm 寬）5 引線(xiàn) 供應(yīng)商設(shè)備封裝:5-TSOP 包裝:剪切帶 (CT) 其它名稱(chēng):NCP301HSN18T1GOSCT
LTC694CN8#PBF 功能描述:IC MPU SUPERVISORY CIRCUIT 8-DIP RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 其它有關(guān)文件:STM6717 View All Specifications 標(biāo)準(zhǔn)包裝:1 系列:- 類(lèi)型:多壓監(jiān)控器 監(jiān)視電壓數(shù)目:2 輸出:開(kāi)路漏極或開(kāi)路集電極 復(fù)位:低有效 復(fù)位超時(shí):最小為 600 ms 電壓 - 閥值:1.11V，3.075V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應(yīng)商設(shè)備封裝:SOT-23-5 包裝:Digi-Reel® 產(chǎn)品目錄頁(yè)面:1194 (CN2011-ZH PDF) 其它名稱(chēng):497-7019-6
LTC694CN8-3.3 功能描述:IC MPU SUPRVISRY CIRC 3.3V 8-DIP RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 類(lèi)型:簡(jiǎn)單復(fù)位/加電復(fù)位 監(jiān)視電壓數(shù)目:1 輸出:開(kāi)路漏極或開(kāi)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(lèi)型:表面貼裝 封裝/外殼:6-TSOP（0.059"，1.50mm 寬）5 引線(xiàn) 供應(yīng)商設(shè)備封裝:5-TSOP 包裝:剪切帶 (CT) 其它名稱(chēng):NCP301HSN18T1GOSCT
LTC694CN8-3.3#PBF 功能描述:IC MPU SUPRVISRY CIRC 3.3V 8-DIP RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 類(lèi)型:簡(jiǎn)單復(fù)位/加電復(fù)位 監(jiān)視電壓數(shù)目:1 輸出:開(kāi)路漏極或開(kāi)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(lèi)型:表面貼裝 封裝/外殼:6-TSOP（0.059"，1.50mm 寬）5 引線(xiàn) 供應(yīng)商設(shè)備封裝:5-TSOP 包裝:剪切帶 (CT) 其它名稱(chēng):NCP301HSN18T1GOSCT
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