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参数资料
| 型号： | LTC2908CDDB8-A1 |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 6-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封装： | 3 X 2 MM, PLASTIC, M0-229WECD-1, DFN-8 |
| 文件页数： | 3/16页 |
| 文件大小： | 199K |
| 代理商： | LTC2908CDDB8-A1 |
11
LTC2908
2908f
APPLICATIO S I FOR ATIO
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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 VCC = 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 VCC. During
fault condition, VCC of at least 0.5V guarantees a maxi-
mum VOL = 0.15V at RST.
Output Rise and Fall Time Estimation
The following formula estimates the output fall time (90%
to 10%) for a particular external load capacitance (CLOAD):
tFALL ≈ 2.2 RPD CLOAD
where RPD is the on-resistance of the internal pull-down
transistor estimated to be typically 40
at room tempera-
ture (25
°C) and CLOAD 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 VCC. The following formula esti-
mates the output rise time (10% to 90%) at the RST pin:
tRISE ≈ 2.2 RPU CLOAD
where RPU is the on-resistance of the pull-up transistor.
Notice that this pull-up transistor is modeled as a 6
A
current source in the Block Diagram as a typical
representation.
The on-resistance as a function of the VCC = Max(V1, V2)
voltage (for VCC > 1V) at room temperature is estimated as
follows:
R
MAX V V
V
PU =
()
610
12
1
5
,–
At VCC = 3.3V, RPU is about 260k. Using 150pF for load
capacitance, the rise time is 86
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
s for a 150pF load capacitance when using
a 10k pull-up resistor.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC2908CDDB-A1 | 制造商:Linear Technology 功能描述:Volt Supervisor Monitor 1.8V/2.5V/3.3V/5V 8-Pin DFN EP |
| LTC2908CDDB-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 |
| LTC2908CDDB-A1#TR | 功能描述:IC MONITOR SIX SUPPLY PREC 8DFN RoHS:否 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 标准包装:1 系列:- 类型:简单复位/加电复位 监视电压数目:1 输出:开路漏极或开路集电极 复位:高有效 复位超时:- 电压 - 阀值:1.8V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:6-TSOP（0.059"，1.50mm 宽）5 引线 供应商设备封装:5-TSOP 包装:剪切带 (CT) 其它名称:NCP301HSN18T1GOSCT |
| LTC2908CDDB-A1#TRM | 功能描述:IC MONITOR SIX SUPPLY PREC 8DFN RoHS:否 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 标准包装:1 系列:- 类型:简单复位/加电复位 监视电压数目:1 输出:开路漏极或开路集电极 复位:高有效 复位超时:- 电压 - 阀值:1.8V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:6-TSOP（0.059"，1.50mm 宽）5 引线 供应商设备封装:5-TSOP 包装:剪切带 (CT) 其它名称:NCP301HSN18T1GOSCT |
| LTC2908CDDB-A1#TRMPBF | 功能描述:IC MONITOR SIX SUPPLY PREC 8DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 标准包装:1 系列:- 类型:简单复位/加电复位 监视电压数目:1 输出:开路漏极或开路集电极 复位:高有效 复位超时:- 电压 - 阀值:1.8V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:6-TSOP（0.059"，1.50mm 宽）5 引线 供应商设备封装:5-TSOP 包装:剪切带 (CT) 其它名称:NCP301HSN18T1GOSCT |
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