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參數(shù)資料
| 型號(hào)： | LTC2908IDDB-A1 |
| 廠商： | Linear Integrated Systems |
| 英文描述： | Precision Six Supply Monitor |
| 中文描述： | 精密六電源監(jiān)視器 |
| 文件頁(yè)數(shù)： | 11/16頁(yè) |
| 文件大?。?/td> | 171K |
| 代理商： | LTC2908IDDB-A1 |
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11
LTC2908
sn2908 2908fs
APPLICATIOU
RST Output Characteristics
The DC characteristics of the RST pull-up and pull-down
strength are shown in the Typical Performance Character-
istics section. The RST output has a weak internal pull-up
to V
CC
= Max(V1, V2) and a strong pull-down to ground.
The weak pull-up and strong pull-down arrangement
allows this pin to have open-drain behavior while possess-
ing several other beneficial characteristics.
The weak pull-up eliminates the need for external pull-up
resistors when the rise time on these pins is not critical. On
the other hand, the open-drain RST configuration allows
for wired-OR connections and can be useful when more
than one signal needs to pull down on the RST line.
As noted in the discussion of power-up and power-down,
the circuits that drive RST are powered by V
CC
. During
fault condition, V
CC
of at least 0.5V guarantees a maxi-
mum V
OL
= 0.15V at RST.
W
U
U
Output Rise and Fall Time Estimation
The following formula estimates the output fall time (90%
to 10%) for a particular external load capacitance (C
LOAD
):
t
FALL
≈
2.2 R
PD
C
LOAD
where R
PD
is the on-resistance of the internal pull-down
transistor estimated to be typically 40
at room tempera-
ture (25
°
C) and C
LOAD
is the external load capacitance on
the pin. Assuming a 150pF load capacitance, the fall time
is about 13ns.
The rise time on the RST pin is limited by a weak internal
pull-up current source to V
CC
. The following formula esti-
mates the output rise time (10% to 90%) at the RST pin:
t
RISE
≈
2.2 R
PU
C
LOAD
where R
PU
is the on-resistance of the pull-up transistor.
Notice that this pull-up transistor is modeled as a 6
μ
A
current source in the Block Diagram as a typical
representation.
The on-resistance as a function of the V
CC
= Max(V1, V2)
voltage (for V
CC
> 1V) at room temperature is estimated as
follows:
R
MAX V1 2
V
PU
=
)
6 10
,
1
5
–
At V
CC
= 3.3V, R
PU
is about 260k. Using 150pF for load
capacitance, the rise time is 86
μ
s. A smaller external pull-
up resistor may be used if the output needs to pull up faster
and/or to a higher voltage. For example, the rise time
reduces to 3.3
μ
s for a 150pF load capacitance when using
a 10k pull-up resistor.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC2908IDDB-A1#PBF | 制造商:Linear Technology 功能描述:Volt Supervisor Monitor 1.8V/2.5V/3.3V/5V 8-Pin DFN EP 制造商:Linear Technology 功能描述:MS-System Monitor/Supervisor, Cut Tape Six Supply Monitor in DFN |
| LTC2908IDDB-A1#TR | 功能描述:IC MONITOR SIX SUPPLY PREC 8DFN 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 |
| LTC2908IDDB-A1#TRM | 功能描述:IC MONITOR SIX SUPPLY PREC 8DFN 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 |
| LTC2908IDDB-A1#TRMPBF | 功能描述:IC MONITOR SIX SUPPLY PREC 8DFN RoHS:是 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 |
| LTC2908IDDB-A1#TRPBF | 功能描述:IC MONITOR SIX SUPPLY PREC 8DFN RoHS:是 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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