参数资料
型号: ADM809MAKS-REEL7
厂商: Analog Devices Inc
文件页数: 1/12页
文件大小: 0K
描述: IC SUPERVISOR P/P 4.38V SC70-3
标准包装: 3,000
类型: 简单复位/加电复位
监视电压数目: 1
输出: 推挽式,图腾柱
复位: 低有效
复位超时: 最小为 140 ms
电压 - 阀值: 4.38V
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: SC-70,SOT-323
供应商设备封装: SC-70-3
包装: 带卷 (TR)

Microprocessor Supervisory Circuits
in 3-Lead SC70 and SOT-23
ADM803/ADM809/ADM810
FEATURES
Specified over temperature
Low power consumption: 17 μA
FUNCTIONAL BLOCK DIAGRAMS
ADM803
Precision voltage monitor: 2.5 V, 3 V, 3.3 V, 5 V options
Reset assertion down to 1 V V CC
140 ms minimum power-on reset
V CC
V REF
RESET
GENERATOR
240ms
RESET
Open-drain RESET output (ADM803)
Push-pull RESET output (ADM809)
Push-pull RESET output (ADM810)
SC70 and SOT-23 packages
APPLICATIONS
GND
ADM809/ADM810
Microprocessor systems
Computers
Controllers
V CC
V REF
RESET
GENERATOR
240ms
RESET
(RESET)
Intelligent instruments
Automotive systems
V CC
GND
V CC
ADM803/ADM809
RESET
GND
*R PULL-UP
V CC
MICROPROCESSOR
SYSTEM
RESET
INPUT
GND
*ADM803 ONLY
Figure 1.
GENERAL DESCRIPTION
The ADM803/ADM809/ADM810 supervisory circuits monitor
the power supply voltage in microprocessor systems. They
provide a reset output during power-up, power-down, and
brownout conditions. On power-up, an internal timer holds
reset asserted for 240 ms. This holds the microprocessor in a
reset state until conditions have stabilized. The reset output
remains operational with V CC as low as 1 V. The ADM803 and
ADM809 provide an active low reset signal (RESET), whereas
the ADM810 provides an active high signal (RESET) output.
The ADM809 and ADM810 have push-pull outputs, whereas
the ADM803 has an open-drain output, which requires an
external pull-up resistor.
Rev. H
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
Seven reset threshold voltage options are available, suitable for
monitoring a variety of supply voltages (see Table 3).
The reset comparator features built-in glitch immunity, making
it immune to fast transients on V CC .
The ADM803/ADM809/ADM810 consume only 17 μA, making
them suitable for low power, portable equipment. The ADM803
is available in a 3-lead SC70; the ADM809/ADM810 are available
in 3-lead SOT-23 and 3-lead SC70 packages.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 ?1997–2008 Analog Devices, Inc. All rights reserved.
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