ADM708: 3 V, Voltage Monitoring Microprocessor Supervisory Circuit

The ADM705/ADM706/ADM707/ADM708 are low cost microprocessor supervisory circuits. They are suitable for monitoring the 5 V power supply/battery and can also monitor microprocessor activity.

The ADM705/ADM706 provide the following functions:

• Power-on reset output during power-up, power-down, and brownout conditions. The RESET output remains operational with VCC as low as 1 V.
• Independent watchdog timeout, WDO, that goes low if the watchdog input has not been toggled within 1.6 seconds.
• A 1.25 V threshold detector for power-fail warning, low battery detection, or to monitor a power supply other than 5 V.
• An active low debounced manual reset input (MR).

The ADM707/ADM708 differ in that

• A watchdog timer function is not available.
• An active high reset output is available in addition to the active low output.

Two supply voltage monitor levels are available. The ADM705/ADM707 generate a reset when the supply voltage falls below 4.65 V, while the ADM706/ADM708 require that the supply fall below 4.40 V before a reset is issued.

All parts are available in 8-lead PDIP (N-8) and SOIC (R-8) packages, with the ADM708 also available in an MSOP (RM-8) package.

产品应用领域 Applications

• Microprocessor systems
• Computers
• Controllers
• Intelligent instruments
• Automotive systems
• Critical microprocessor supply monitoring

ADM708 特点

• Guaranteed RESET valid with VCC = 1 V
• 190 μA quiescent current
• Precision supply voltage monitor
  4.65 V (ADM705/ADM707)
  4.40 V (ADM706/ADM708)
• 200 ms reset pulse width
• Debounced TTL/CMOS manual reset input (MR)
• Independent watchdog timer (ADM705/ADM706)
• 1.6 sec timeout (ADM705/ADM706)
• Active high reset output (ADM707/ADM708)
• Voltage monitor for power-fail or low battery warning
• Superior upgrade for MAX705 to MAX708

ADM708 功能框图

ADM708 芯片订购指南

产品型号	产品状态	封装	引脚	温度范围
ADM708AN	量产	8 ld PDIP	8	工业
ADM708ANZ	量产	8 ld PDIP	8	工业
ADM708AR	量产	8 ld SOIC	8	工业
ADM708AR-REEL	量产	8 ld SOIC	8	工业
ADM708ARM	量产	8 ld MSOP	8	工业
ADM708ARMZ	量产	8 ld MSOP	8	工业
ADM708ARMZ-REEL	量产	8 ld MSOP	8	工业
ADM708ARZ	量产	8 ld SOIC	8	工业
ADM708ARZ-REEL	量产	8 ld SOIC	8	工业
ADM708RANZ	量产	8 ld PDIP	8	工业
ADM708RAR	量产	8 ld SOIC	8	工业
ADM708RAR-REEL	量产	8 ld SOIC	8	工业
ADM708RARZ	量产	8 ld SOIC	8	工业
ADM708RARZ-REEL	量产	8 ld SOIC	8	工业
ADM708SANZ	量产	8 ld PDIP	8	工业
ADM708SAR	量产	8 ld SOIC	8	工业
ADM708SAR-REEL	量产	8 ld SOIC	8	工业
ADM708SARZ	量产	8 ld SOIC	8	工业
ADM708SARZ-REEL	量产	8 ld SOIC	8	工业
ADM708TAN	量产	8 ld PDIP	8	工业
ADM708TANZ	量产	8 ld PDIP	8	工业
ADM708TAR	量产	8 ld SOIC	8	工业
ADM708TARZ	量产	8 ld SOIC	8	工业

ADM708 应用技术支持与电子电路设计开发资源下载

1. ADM708 数据手册DataSheet 下载 . PDF
2. ADI 模拟器件公司比较器产品选型指南 . PDF
3. Analog Devices, Inc. 美国模拟器件公司产品订购手册 .PDF
4. 电压监测及序列分析
5. 40年的模拟领导不为电源管理IC