MAX793

Precision Supply-Voltage Monitor: Fixed Reset Trip Voltage (MAX793/MAX795) Adjustable Reset Trip Voltage (MAX794)
Guaranteed Reset Assertion to VCC = 1V
Backup-Battery Power Switching-Battery Voltage Can Exceed VCC
On-Board Gating of Chip-Enable Signals-7ns Max Propagation Delay MAX793/MAX794 Only
Battery Freshness Seal
Battery OK Output (MAX793)
Uncommitted Voltage Monitor for Power-Fail or Low-Battery Warning
Independent Watchdog Timer (1.6sec timeout)
Manual Reset Input

Battery-Powered Computers and Controllers Embedded Controllers Intelligent Controllers Critical P Power Monitoring Portable Equipment

Terminal Voltage (with respect to GND)
VCC ............................................................................................-0.3V to 6.0V
VBATT .........................................................................................-0.3V to 6.0V
All Other Inputs ......................................-0.3V to the higher of VCC or VBATT
Continuous Input Current
VCC .....................................................................................................200mA
VBATT ....................................................................................................50mA
GND........................................................................................................20mA
Output Current
VOUT....................................................................................................200mA
All Other Outputs ..................................................................................20mA
Continuous Power Dissipation (TA = +70°C)
8-Pin Plastic DIP (derate 9.09mW/°C above +70°C) .......................727mW
8-Pin SO (derate 5.88mW/°C above +70°C)....................................471mW
16-Pin Plastic DIP (derate 10.53mW/°C above +70°C).................. .842mW
16-Pin Narrow SO (derate 9.52mW/°C above +70°C) .....................696mW
Operating Temperature Ranges
MAX793_C_ _/MAX794C_ _/MAX795_C_ _ ............................ 0°C to +70°C
MAX793_E_ _/MAX794E_ _/MAX795_E_ _ ...........................-40°C to +85°C
Storage Temperature Range .............................................-65°C to +160°C
Lead Temperature (soldering, 10sec) ...............................................+300°C

The MAX793/MAX794/MAX795 microprocessor (P) supervisory circuits monitor and control the activities of +3.0V/+3.3V Ps by providing backup-battery switchover, among other features such as low-line indication, P reset, write protection for CMOS RAM, and a watchdog (see the Selector Guide below). The backup-battery voltage of MAX793 can exceed VCC, permitting the use of 3.6V lithium batteries in systems using 3.0V to 3.3V for VCC.

The MAX793/MAX795 offer a choice of reset threshold voltage range (denoted by suffix letter): 3.00V to 3.15V (T), 2.85V to 3.00V (S), and 2.55V to 2.70V (R). The MAX794's reset threshold is set externally with a resistor divider. The MAX793/MAX794 are available in 16-pin DIP and narrow SO packages, and the MAX795 comes in 8-pin DIP and SO packages. For similar devices
designed for 5V systems, see the P Supervisory Circuits table at the back of this data sheet.