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參數(shù)資料
| 型號： | ISL88031IU8HEZ |
| 廠商： | INTERSIL CORP |
| 元件分類： | 電源管理 |
| 英文描述： | Quintuple Voltage Monitor |
| 中文描述： | 5-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | ROHS COMPLIANT, PLASTIC, MO-187AA, MSOP-8 |
| 文件頁數(shù)： | 4/7頁 |
| 文件大?。?/td> | 243K |
| 代理商： | ISL88031IU8HEZ |
4
FN8227.0
March 31, 2006
Pin Description
RST
The RST output is an open drain output which is asserted
low whenever
1. the device is initially powered up to 1V or
2. V
DD
, V2MON, V3MON, V4MON, or V5MON fall below
their minimum voltage sense level.
MR
The MR input is an active low debounced input to which a
user can connect a push-button to add manual reset
capability or use a signal to pull low. MR has an internal pull-
up resistor.
V
DD
The V
DD
pin is the IC power supply terminal. The voltage at
this pin is compared against an internal factory-programmed
voltage trip point, V
TH1
. RST is first asserted low when the
device is initially powered and V
DD
< 1 V and then at any
time thereafter when V
DD
falls below V
TH1
. The device is
designed with hysteresis to help prevent chattering due to
noise and is immune to brief power-supply transients.
V2MON
The V2MON input is the second preset monitored voltage
that causes the RST output to go low when the voltage on
V2MON falls below V
TH2
.
V3MON, V4MON, and V5MON
The VxMON inputs provide monitoring and UV compliance
of three additional voltages through resistor dividers. A reset
is issued on the ISL88031 if the voltage on any VxMON falls
below the internal V
REF
of 0.6V.
Principles of Operation
The ISL88031 device provide those functions needed for
monitoring critical voltages such as power-supply and battery
functions in microprocessor systems. It provides such features
as Power On Reset control, Supply Voltage Supervision, and
Manual Reset Assertion. The integration of all these features
along with competitive reset threshold accuracy and low power
consumption make the ISL88031 device suitable for a wide
variety of applications needing multi-voltage monitoring.
See Figure 1 for typical application diagram.
Low Voltage Monitoring
During normal operation, the ISL88031 monitors the voltage
levels of V
DD
, V2MON, V3MON, V4MON, and V5MON. If the
voltage on any of these five inputs falls below their respective
voltage trip points, a reset is asserted (RST = low) to prevent
the microprocessor from operating during a power failure or
brownout condition. This reset signal remains low until the
voltages exceeds the voltage threshold settings for the reset
time delay period t
POR
.
The ISL88031 allows users to customize the minimum voltage
sense level for three of the five monitored voltages. For
example, the user can adjust the voltage input trip point (V
TRIP
)
for V3MON, V4MON and V5MON inputs. To do this, connect
an external resistor divider network to the VxMON pin in order
to set the trip point to some other voltage above 600mV
according to the following formula:
V
TRIP
= 0.6V X (R1 + R2) / R2
MANUAL RESET
V
MRL
MR Input Voltage Low
0.8
V
V
MRH
MR Input Voltage High
V
DD
-0.6
V
t
MR
MR Minimum Pulse Width
550
ns
R
PU
Internal Pull-Up Resistor
10
k
Electrical Specifications
Over the recommended operating conditions unless otherwise specified.
(Continued)
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
FIGURE 1. TYPICAL APPLICATION DIAGRAM
V3MON
MR
PB
GND
RST
reset
signal
V2MON
V
DD
ISL88031
V4MON
V5MON
ISL88031
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| ISL88031IU8HFZ-TK | 功能描述:IC VOLTAGE MONITOR QUINT 8-MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:簡單復(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:低有效 復(fù)位超時:最小為 600 ms 電壓 - 閥值:3.8V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應(yīng)商設(shè)備封裝:SOT-23-5 包裝:帶卷 (TR) |
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