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参数资料
| 型号： | LTC2908IDDB-B1#TRM |
| 厂商： | Linear Technology |
| 文件页数： | 13/18页 |
| 文件大小： | 0K |
| 描述： | IC MONITOR SIX SUPPLY PREC 8DFN |
| 标准包装： | 500 |
| 类型： | 多压监控器 |
| 监视电压数目： | 6 |
| 输出： | 开路漏极或开路集电极 |
| 复位： | 低有效 |
| 复位超时： | 最小为 160 ms |
| 电压 - 阀值： | 1.403V，1.683V，2.338V，3.086V，可调，可调 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WFDFN 裸露焊盘 |
| 供应商设备封装： | 8-DFN（3x2） |
| 包装： | 带卷 (TR) |
| 其它名称： | LTC2908IDDB-B1 LTC2908IDDB-B1-ND |
LTC2908
APPLICATIONS INFORMATION
MAX ( ) – 1V
R PU = Ω
RSTOutputCharacteristics
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 possessing
several other bene?cial 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 behavior 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
a fault condition, a V CC of at least 0.5V guarantees a
maximum V OL = 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 (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 40Ω at room
temperature (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 transis-
tor. Notice that this pull-up transistor is modeled as a
6μA 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:
6 ? 10 5
V1,V2
At V CC = 3.3V, R PU is about 260k. Using 150pF for load
capacitance, the rise time is 86μs. 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 3.3μs for a 150pF load capacitance when
using a 10k pull-up resistor.
TYPICAL APPLICATIONS
Six Supply Monitor, 5% Tolerance, 12V, 5V, 3.3V, 2.5V, 1.8V, 1V
12V
DC/DC
DC/DC
5V
3.3V
DC/DC
DC/DC
DC/DC
2.5V
1.8V
1.0V
C1
C2
SYSTEM
0.1μF 0.1μF
R1
R2
R3
R4
2.15M
100k 86.6k
100k
V1
V2 V3 V4
V ADJ1
V ADJ2
LTC2908-A1
GND
RST
2908 TA02
2908fd
13
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相关代理商/技术参数 |
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| LTC2908IDDB-C1#PBF | 制造商:Linear Technology 功能描述: |
| LTC2908IDDB-C1#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 |
| LTC2908IDDB-C1#TRPBF | 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 |
| LTC2908ITS8-A1 | 制造商:Linear Technology 功能描述:Volt Supervisor Monitor 1.8V/2.5V/3.3V/5V 8-Pin TSOT-23 |
| LTC2908ITS8-A1#PBF | 制造商:Linear Technology 功能描述:Volt Supervisor Monitor 1.8V/2.5V/3.3V/5V 8-Pin TSOT-23 |
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