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參數(shù)資料
| 型號： | SP809NEK-4-6 |
| 英文描述： | 3 Pin Microprocessor Supervisor Circuit |
| 中文描述： | 3引腳微處理器監(jiān)控電路 |
| 文件頁數(shù)： | 5/8頁 |
| 文件大小： | 191K |
| 代理商： | SP809NEK-4-6 |
5
Date: 5/02/06 Rev B SP809/810, 3 Pin Microprocessor Supervisor Circuit Copyright 2006 Sipex Corporation
PIN DESCRIPTION
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μ
P will be activated at a valid reset state.
These
μ
P supervisory circuits assert reset to
prevent code execution errors during power-
up, power-down, or brownout conditions.
Reset is guaranteed to be a logic low for
V
>V
>0.9V. Once V
exceeded the reset
threshold, an internal timer keeps RESET low
for the reset timeout period; after this interval,
RESET goes high.
If a brownout condition occurs (V
drops
below the reset threshold), RESET goes low.
Any time V
goes below the reset threshold,
the internal timer resets to zero, and RESET
goes low. The internal timer is activated after
V
returns above the reset threshold, and
RESET remains low for the reset timeout
period.
DETAILED DESCRIPTION
Benefits of Highly Accurate Reset
Threshold
SP809/810 with specified voltage as 5V
±
10%
or 3V
±
10% are ideal for systems using a
5V
±
5% or 3V
±
5% power supply. The reset is
guaranteed to assert after the power supply
falls below the minimum specified operating
voltage range of the system ICs. The
pretrimmed thresholds are reducing the range
over which an undesirable reset may occur.
APPLICATION INFORMATION
Negative-Going V
CC
Transients
In addition to issuing a reset to the
μ
P during
power-up, power-down, and brownout condi-
tions, SP809 series are relatively resistant to
short-duration negative-going V
CC
transient.
Ensuring a Valid Reset Output Down to
VCC= 0
When V
falls below 0.9V, SP809 RESET
output no longer sinks current; it becomes
an open circuit. In this case, high-imped-
ance CMOS logic inputs connecting to
RESET can drift to undetermined voltages.
Therefore, SP809/810 with CMOS is
perfect for most applications of V
CC
down to
0.9V.
However in applications where RESET
must be valid down to 0V, adding a pull-
down resistor to RESET causes any
leakage currents to flow to ground, holding
RESET low.
Interfacing to
μ
P with Bidirectional
Reset Pins
The RESET output on the SP809N is open
drain, this device interfaces easily with
μ
Ps
that have bidirectional reset pins. Connect-
ing the
μ
P supervisor's RESET output
directly to the microcontroller's RESET pin
with a single pull-up resistor allows either
device to assert reset.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SP810 | 3 Pin Microprocessor Supervisor Circuit |
| SP810EK-2-3 | 3 Pin Microprocessor Supervisor Circuit |
| SP810EK-2-6 | 3 Pin Microprocessor Supervisor Circuit |
| SP810EK-2-9 | 3 Pin Microprocessor Supervisor Circuit |
| SP810EK-3-1 | 3 Pin Microprocessor Supervisor Circuit |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP809NEK-4-6/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:3 Pin Microprocessor Supervisor Circuit |
| SP809NEK-L-2-3/TR | 功能描述:監(jiān)控電路 3 PIN MICROPROCESSOR RESET CIRCUIT RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| SP809NEK-L-2-6 | 制造商:Exar Corporation 功能描述: |
| SP809NEK-L-2-9/TR | 功能描述:監(jiān)控電路 3 PIN MICROPROCESSOR RESET CIRCUIT RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| SP809NEK-L-3-1/TR | 功能描述:監(jiān)控電路 3 PIN MICROPROCESSOR RESET CIRCUIT RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
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