MAX694：Microprocessor Supervisory Circuits _ BDTIC a Leading Distributor in China

MAX694：Microprocessor Supervisory Circuits

Industry-Standard, Full-Function µP Supervisor

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.

Key Features

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: Pin Configuration

Applications/Uses

Automotive Systems
Computers
Controllers
Critical µP Power Monitoring
Intelligent Instruments

DataSheet

title	Download file
MAX690-MAX695 Data Sheet	MAX690-MAX695.pdf

Parametrics

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

Ordering Information

Part Number	Status	Recommended Replacement	Package	Temp	RoHS
MAX694C/D	Active		DICE SALES,;NA pin;DICE;		See data sheet
MAX694CPA	No Longer Available	MAX694CPA+	PDIP(N),;8 pin;79.7 mm²	0°C to +70°C	No
MAX694CPA+	Active		PDIP(N),;8 pin;79.7 mm²	0°C to +70°C	Lead Free
MAX694EJA	Active		CDIP(N),;8 pin;82.6 mm²	-40°C to +85°C	No
MAX694EPA	No Longer Available	MAX694EPA+	PDIP(N),;8 pin;79.7 mm²	-40°C to +85°C	No
MAX694EPA+	Active		PDIP(N),;8 pin;79.7 mm²	-40°C to +85°C	Lead Free
MAX694MJA	Active		CDIP(N),;8 pin;82.6 mm²	-55°C to +125°C	No
MAX694MJA/883B	Active		CDIP(N),;8 pin;82.6 mm²	-55°C to +125°C	No
MAX694MLP/883B	No Longer Available		LCC,;20 pin;82.6 mm²	-55°C to +125°C	No

MAX690-MAX695.pdf MAX695