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| 型号： | ISL88021IU8HFZ |
| 厂商： | Intersil |
| 文件页数： | 4/7页 |
| 文件大小： | 0K |
| 描述： | IC VOLT MONITOR TRPL 8-MSOP |
| 标准包装： | 80 |
| 类型： | 多压监控器 |
| 监视电压数目： | 3 |
| 输出： | 开路漏极，推挽式 |
| 复位： | 高有效/低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 3.09V，4.649V，可调 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-MSOP |
| 包装： | 管件 |
ISL88021, ISL88022
Electrical Specifications
Over the recommended operating conditions unless otherwise specified. (Continued)
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
MANUAL RESET
V MRL
V MRH
t MR
R PU
MR Input Voltage Low
MR Input Voltage High
MR Minimum Pulse Width
Internal Pull-Up Resistor
V DD -0.6
550
20
0.8
V
V
ns
k Ω
Functional Description
The ISL88021 and ISL88022 devices incorporate such features
as Power-On-Reset control, Supply Voltage Supervision,
Undervoltage or Overvoltage Monitoring, and Manual Reset
Assertion.
The ISL88021 and ISL88022 devices provide common preset
threshold voltages on both V DD and V2MON and for an
optional resistor divider network on V3MON to provide custom
voltage monitoring of voltages greater than 0.6V. An optional
capacitor can be connected between the C POR pin and GND to
increase the nominal 200ms t POR delay. Figure 7 illustrates
operational functionality with a timing diagram.
Voltage Monitoring
During normal operation, the ISL88021 and ISL88022 monitor
the voltage levels on V DD , V2MON and V3MON. The
ISL88021 asserts reset if any one of these voltages fall below
their respective voltage trip points and in the case of ISL88022
above the voltage trip point on the V3MON input. The reset
signal effectively prevents the microprocessor from operating
during a power failure, brownout or over voltage condition. This
signal remains active until all monitored voltages meet all
voltage threshold requirements for the reset time delay period
t POR . Note that both RESET and RESET signals are provided
for design flexibility. Figure 1 illustrates the VDD, V2MON and
V3MON input threshold voltages for the various available
options.
5.000
Power-On-Reset (POR)
Applying power to the ISL88021 and ISL88022 devices
activates a POR circuit which holds the RESET pin low once
V DD > 1V. This signal provides several benefits:
? It prevents the system microprocessor from starting to
operate with insufficient voltage.
? It prevents the processor from operating prior to
stabilization of the oscillator.
? It ensures that the monitored device is held out of operation
until internal registers are properly loaded.
? It allows time for an FPGA to download its configuration prior
to initialization of the circuit.
When all of the monitored voltages meet their respective
input voltage requirements for the specified reset timeout
delay t POR , the POR circuit simultaneously pulls the RST
output low and releases the RST output to allow the system
to begin operation.
Adjusting t POR
On the ISL88021 and ISL88022, users can adjust the
Power-On-Reset timeout delay (t POR ) to many times the
nominal t POR . Figure 2 illustrates the effect of capacitance
on the C POR pin to ground, showing changing t POR with a
graph normalized to 175ms for an open C POR pin. The
maximum recommended capacitance that should be placed
on the C POR pin is 50pF. NOTE: Care should be taken in
PCB layout and capacitor placement in order to eliminate
stray capacitance as much as possible, which contributes to
4.500
4.000
3.500
3.000
2.500
2.000
1.500
1.000
Vth = 4.64V
Vth = 3.09V
Vth = 2.92V
Vth = 2.32V
Vth = 1.69V
t POR error.
10
8
6
4
0.500
0.000
-40
Vth = 0.60V
25
TEMPERATURE (°C)
85
2
0
1
5
9 13 17 21 25 29 33 37 41 45
FIGURE 1. VDD, V2MON, V3MON VTH vs TEMP
4
C POR (pF)
FIGURE 2. NORMALIZED t POR vs C POR GRAPH
FN8226.1
September 18, 2006
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| ISL88022IU8FAZ | 功能描述:IC VOLT MONITOR TRPL 8-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 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:低有效 复位超时:最小为 600 ms 电压 - 阀值:3.8V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:带卷 (TR) |
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