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參數(shù)資料
| 型號： | LTC1726ES8-5 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | Triple Supply Monitor and uP Supervisor with Adjustable Reset and Watchdog Timer |
| 中文描述： | 3-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SOP-8 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大小： | 172K |
| 代理商： | LTC1726ES8-5 |
7
LTC1726
manner, the part can function as a 5V monitor with the
3.3V monitor disabled.
When monitoring either 3.3V or 5V with V
CC3
strapped to
V
CC5
, (see Figure 1) the part determines which is the
appropriate range. The part handles this situation as
shown in Figure 2. Above 1V and below V
RT3
, RST is held
low. From V
RT3
to approximately 4.15V, the part as-
sumes 3.3V supply monitoring and RST is deasserted.
Above approximately 4.15V, the part operates as a 5V
monitor. In most systems, the 5V supply will pass
through the 3.1V to 4.15V region in <200ms during
power-up, and the RST output will behave as desired.
Table 1 summarizes the state of RST at various operating
voltages with V
CC3
= V
CC5
.
Table 1. Override Truth Table (V
CC3
= V
CC5
)
INPUTS (V
CC3
= V
CC5
= V
CC
)
0V
≤
V
CC
≤
1V
1V
≤
V
CC
≤
V
RT3
V
RT3
≤
V
CC
≤
4.15V
4.15V
≤
V
CC
≤
V
RT5
V
RT5
≤
V
CC
RST
—
0
1
0
1
Supply Monitoring
The LTC1726 is a low power, high accuracy triple supply
monitor and watchdog timer. The watchdog and reset
periods are both adjustable using external capacitors.
All three V
CC
inputs must be above predetermined thresh-
olds for reset not to be asserted. The LTC1726 will assert
reset during power-up, power-down and brownout condi-
tions on any one or all of the V
CC
inputs.
Upon power-up, either the V
CC5
/V
CC25
or V
CC3
pin can
power the drive circuits for the RST pin. This ensures that
RST will be low when either V
CC5
/V
CC25
or V
CC3
reaches
1V. As long as any one of the V
CC
inputs is below its
predetermined threshold, RST will stay a logic low. Once
all of the V
CC
inputs rise above their thresholds, the
adjustable reset timer is started and RST is released after
the reset time-out period.
On power-down, once any of the V
CC
inputs drops below its
threshold, RST is held at a logic low. A logic low of 0.3V is
guaranteed until both V
CC3
and V
CC5
/V
CC25
drop below 1V.
3V or 5V/2.5V Power Detect
Since the LTC1726 is a multisupply monitor, it will be
required to assert reset as soon as there is power on any
one of the monitor inputs. Therefore, the part derives its
power from either the V
CC3
or V
CC5
/V
CC25
input, which-
ever pin has the greatest potential. This ensures the part
pulls the RST pin low as soon as either input pin is
≥
1V.
The adjustable input is excluded from being a potential
supply pin because of its 1V nominal operating range.
Override Functions (5V Versions Only)
The V
CCA
pin, if unused, can be tied to either V
CC3
or V
CC5
.
This is an obvious solution since the trip points for V
CC3
and V
CC5
will always be greater than the trip point for V
CCA
.
The V
CC5
input trip point is disabled if its voltage is equal
to the voltage on V
CC3
±
25mV and the voltage on V
CC5
is
less than 4.15V. In this manner the LTC1726-5 behaves
as a 3.3V monitor and the 5V reset function is disabled.
The V
CC5
trip point is re-enabled when the voltage on
V
CC5
is equal to the voltage on V
CC3
±
25mV and the two
inputs are greater than approximately 4.15V. In this
V
CC3
V
CC5
V
CCA
GND
6
1
2
3
4
RST
LTC1726-5
1726 F01
TO SYSTEM
RESET
PINS 5, 7 AND 8 NOT SHOWN FOR CLARITY
R1
10k
V
3.3V OR 5V
Figure 2. RST Voltage vs Supply Voltage
Figure 1. Single Supply Monitor with Others Disabled
SUPPLY VOLTAGE (V)
0
R
3
4
5
4
1726 F02
2
1
0
1
2
3
5
V
CC3
= V
CC5
= V
CCA
= 0V TO 5V
10k PULL-UP FROM RST TO V
CC3
T
A
= 25
°
C
APPLICATIOU
W
U
U
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| LTC1726ES8-5#PBF | 功能描述:IC TRPL SUPPLY MONITOR 5V 8-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標(biāo)準(zhǔn)包裝:100 系列:- 類型:簡單復(fù)位/加電復(fù)位 監(jiān)視電壓數(shù)目:1 輸出:開路漏極，開路漏極 復(fù)位:高有效/低有效 復(fù)位超時(shí):最小為 250 ms 電壓 - 閥值:4.37V，4.62V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:8-SOIC 包裝:管件 產(chǎn)品目錄頁面:1337 (CN2011-ZH PDF) |
| LTC1726ES8-5#TR | 功能描述:IC MON TRPL SPPLY SUPERVSR 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標(biāo)準(zhǔn)包裝:400 系列:- 類型:備用電池電路 監(jiān)視電壓數(shù)目:1 輸出:開路漏極，推挽式 復(fù)位:高有效/低有效 復(fù)位超時(shí):最小為 35 ms 電壓 - 閥值:4.65V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC W 包裝:帶卷 (TR) 其它名稱:ADM691ARZ-REEL7TR |
| LTC1726ES8-5#TRPBF | 功能描述:IC TRPL SUPPLY MONITOR 5V 8-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標(biāo)準(zhǔn)包裝:400 系列:- 類型:備用電池電路 監(jiān)視電壓數(shù)目:1 輸出:開路漏極，推挽式 復(fù)位:高有效/低有效 復(fù)位超時(shí):最小為 35 ms 電壓 - 閥值:4.65V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC W 包裝:帶卷 (TR) 其它名稱:ADM691ARZ-REEL7TR |
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