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參數(shù)資料
| 型號(hào)： | LTC1985-1.8 |
| 廠商： | Linear Technology Corporation |
| 元件分類： | RS-232 |
| 英文描述： | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| 中文描述： | 5V的高速RS - 232收發(fā)器與0.1uF電容 |
| 文件頁(yè)數(shù)： | 5/8頁(yè) |
| 文件大?。?/td> | 135K |
| 代理商： | LTC1985-1.8 |
5
LTC1985-1.8
V
CC
Monitor Timing
t
RST
1985-18 TD
V
RTX
V
CCX
RST
TIW
W
Supply Monitoring
The LTC1985 is a low power, high accuracy triple supply
monitoring cirucit with a single 200ms microprocessor
reset output.
All three V
CC
inputs must be above predetermined thresh-
olds for reset not to be invoked. The LTC1985 will assert
reset during power-up, power-down and brownout condi-
tions on any one or all of the V
CC
inputs.
3V or 1.8V Power Detect
The LTC1985 is powered from the 3V input pin (V
CC3
) or
the 1.8V input pin (V
CC18
), whichever pin has the highest
potential. This ensures the part pulls the RST pin low as
soon as either input pin is
≥
1V.
Power-Up
Upon power-up, either the V
CC18
or V
CC3
pin, can power
the part. This ensures that RST will be low when either
V
CC18
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, an internal timer is started and RST is released
after 200ms.
RST is reasserted whenever any one of the V
CC
inputs
drops below its predetermined threshold and remains
asserted until 200ms after all of the V
CC
inputs are above
their thresholds.
Power-Down
On power-down, once any of the V
CC
inputs drop below its
threshold, RST is held at a logic low. A logic low of 0.3V is
guaranteed until both V
CC3
and V
CC18
drop below 1V.
Override Functions
The V
CCA
pin, if unused, can be tied to either V
CC3
or V
CC18
.
This is an obvious solution since the trip points for V
CC3
and V
CC18
will always be greater than the trip point for
V
CCA
. Likewise, the V
CC18
, if unused, can be tied to V
CC3
.
V
CC3
must always be used. Tying V
CC3
to V
CC18
and
operating off of a 1.8V supply will result in the continuous
assertion of RST.
APPLICATIOU
W
U
U
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1985ES5-1.8 | 制造商:Linear Technology 功能描述:Volt Supervisor Monitor 1.8V/3V 5-Pin TSOT-23 制造商:Linear Technology 功能描述:3-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5 |
| LTC1985ES5-1.8#PBF | 制造商:Linear Technology 功能描述:Volt Supervisor Monitor 1.8V/3V 5-Pin TSOT-23 制造商:Linear Technology 功能描述:MS-System Monitor/Supervisor, cut tape uP Triple Supply Monitor w Push-Pull |
| LTC1985ES5-1.8#TR | 功能描述:IC MON TRPL SUPPLY PREC TSOT23-5 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 |
| LTC1985ES5-1.8#TRM | 功能描述:IC MON TRI SUPPLY 1.8V TSOT23-5 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 |
| LTC1985ES5-1.8#TRMPBF | 功能描述:IC MON TRI SUPPLY 1.8V TSOT23-5 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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