MAX690：微处理器监控电路 _ BDTIC 中国领先电子元器件代理商

MAX690：微处理器监控电路

工业标准、功能完备的µP监控电路

The MAX690 family of supervisory circuits reduces the complexity and number of components required for power supply monitoring and battery control functions in microprocessor systems. These include µP reset and backup-battery switchover, watchdog timer, CMOS RAM write protection, and power-failure warning. The MAX690 family significantly improves system reliability and accu- racy compared to that obtainable with separate ICs or discrete components. The MAX690, MAX692, and MAX694 are supplied in 8-pin packages and provide four functions: A reset output during power-up, power-down, and brownout conditions. Battery backup switching for CMOS RAM, CMOS microprocessor or other low power logic. A Reset pulse if the optional watchdog timer has not been toggled within a specified time. A 1.3V threshold detector for power fail warning, low battery detection, or to monitor a power supply other than +5V. The MAX691, MAX693, and MAX695 are supplied in 16-pin packages and perform all MAX690, MAX692, MAX694 functions, plus: Write protection of CMOS RAM or EEPROM. Adjustable reset and watchdog timeout periods. Separate outputs for indicating a watchdog timeout, backup-battery switchover, and low VCC.

关键特性

Supervisory Function Integration Saves Board Space while Fully Protecting Microprocessor-Based Systems
- Precision Voltage Monitor
  - 4.65V (MAX690, MAX691, MAX694, MAX695)
  - 4.40V (MAX692, MAX693)
- Power OK/Reset Time Delay
  - 50ms, 200ms, or Adjustable
- Watchdog Timer
  - 100ms, 1.6s, or Adjustable
- Battery Backup Power Switching
- Voltage Monitor for Power Fail or Low Battery Warning
- Minimum External Component Count
Low Power Consumption in Battery Backup Mode Extends Battery Life
- 1µA Standby Current
Onboard Gating of Chip Enable Signals Protects Against Erroneous Data Written to RAM During Low VCC Events

MAX690、MAX691、MAX692、MAX693、MAX694、MAX695：引脚配置

应用

汽车系统
计算机
控制器
精确的µP电源监控
智能仪表

数据手册DataSheet

语言	下载文件	备注
英文	MAX690-MAX695.pdf	Rev 5; 05/2015

关键参数

Part Number	Reset Thresh. (V)	Reset Out	I_CC (µA)	Oper. Temp. (°C)	Package/Pins	Budgetary Price
Part Number	Reset Thresh. (V)	Reset Out	max	Oper. Temp. (°C)	Package/Pins	See Notes
MAX690	4.5 to 5.0	Active Low Push-Pull	5000	-55 to +125 -40 to +85 0 to +70	CDIP(N)/8 LCC/20 PDIP(N)/8	$4.37 @1k
MAX691	4.5 to 5.0	Active High Active Low Push-Pull			CDIP(N)/16 LCC/20 PDIP(N)/16 SOIC(W)/16	$4.17 @1k
MAX692	4.0 to 4.5	Active Low Push-Pull			CDIP(N)/8 LCC/20 PDIP(N)/8	$4.37 @1k
MAX693	4.0 to 4.5	Active High Active Low Push-Pull			CDIP(N)/16 LCC/20 PDIP(N)/16 SOIC(W)/16	$4.17 @1k
MAX694	4.5 to 5.0	Active Low Push-Pull			CDIP(N)/8 LCC/20 PDIP(N)/8	$4.00 @1k
MAX695	4.5 to 5.0	Active High Active Low Push-Pull			CDIP(N)/16 PDIP(N)/16 SOIC(W)/16	$4.37 @1k

技术资料

质量和环境数据

MAX690.pdf

订购型号

型号	状况	推荐替代产品	封装	温度	RoHS/无铅
MAX690C/D	停止供货		DICE SALES,；NA引脚；DICE；	0°C至+70°C	参考数据资料
MAX690CPA	停止供货	MAX690CPA+	PDIP(N),；8引脚；79.7mm²	0°C至+70°C	RoHS/无铅：否
MAX690CPA+	生产中		PDIP(N),；8引脚；79.7mm²	0°C至+70°C	RoHS/无铅：无铅
MAX690EJA	生产中		CDIP(N),；8引脚；82.6mm²	-40°C至+85°C	RoHS/无铅：否
MAX690EPA	停止供货	MAX690EPA+	PDIP(N),；8引脚；79.7mm²	-40°C至+85°C	RoHS/无铅：否
MAX690EPA+	生产中		PDIP(N),；8引脚；79.7mm²	-40°C至+85°C	RoHS/无铅：无铅
MAX690MFB/883B	停止供货		FPCK；10引脚	-55°C至+125°C	参考数据资料
MAX690MJA	生产中		CDIP(N),；8引脚；82.6mm²	-55°C至+125°C	RoHS/无铅：否
MAX690MJA/883B	生产中		CDIP(N),；8引脚；82.6mm²	-55°C至+125°C	RoHS/无铅：否
MAX690MLP/883B	生产中		LCC,；20引脚；82.6mm²	-55°C至+125°C	RoHS/无铅：否