MAX793 Maxim, MAX793 Datasheet
MAX793
Manufacturer Part Number
MAX793
Description
3.0V/3.3V Adjustable Microprocessor Supervisory Circuits
Manufacturer
Maxim
Datasheet
1.MAX793.pdf
(20 pages)
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The MAX793/MAX794/MAX795 microprocessor (µP)
supervisory circuits monitor and control the activities of
+3.0V/+3.3V µPs by providing backup-battery switchover,
among other features such as low-line indication, µP
reset, write protection for CMOS RAM, and a watchdog
(see the Selector Guide below). The backup-battery volt-
age can exceed V
batteries in systems using 3.0V to 3.3V for V
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 µP Supervisory
Circuits table at the back of this data sheet.
________________________Applications
19-0366; Rev 1; 1/96
Pin Configurations appear at end of data sheet.
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
_____________________Selector Guide
_______________General Description
Active-Low Reset
Active-High Reset
Programmable Reset
Threshold
Low-Line Early Warning
Output
Backup-Battery
Switchover
External Switch Driver
Power-Fail Comparator
Battery OK Output
Watchdog Input
Battery Freshness Seal
Manual Reset Input
Chip-Enable Gating
Pins-Package
Battery-Powered Computers and Controllers
Embedded Controllers
Intelligent Controllers
Critical µP Power Monitoring
Portable Equipment
FEATURE
________________________________________________________________ Maxim Integrated Products
CC
, permitting the use of 3.6V lithium
16-DIP/SO 16-DIP/SO 8-DIP/SO
MAX793
3.0V/3.3V Adjustable Microprocessor
MAX794
CC
.
MAX795
MAX793/MAX794/MAX795
MAX793/MAX794 Only
Ordering Information continued on last page.
* The MAX793/MAX795 offer a choice of reset threshold voltage.
Select the letter corresponding to the desired reset threshold
voltage range (T = 3.00V to 3.15V, S = 2.85V to 3.00V, R = 2.55V
to 2.70V) and insert it into the blank to complete the part number.
The MAX794’s reset threshold is adjustable.
____________________________Features
__________Typical Operating Circuit
______________Ordering Information
MAX793_CPE
MAX793_CSE
MAX793_EPE
MAX793_ESE
3.6V
Precision Supply-Voltage Monitor:
Guaranteed Reset Assertion to V
Backup-Battery Power Switching—Battery
Voltage Can Exceed V
On-Board Gating of Chip-Enable Signals—7ns
Max Propagation Delay
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
+5V
Fixed Reset Trip Voltage (MAX793/MAX795)
Adjustable Reset Trip Voltage (MAX794)
PART*
3.0V OR 3.3V
+5V SUPPLY
Supervisory Circuits
FAILURE
0.1 F
0.1 F
V
BATT
PFO
PFI
MR
WDO
-40°C to +85°C
-40°C to +85°C
CC
TEMP. RANGE
(OPTIONAL)
0°C to +70°C
0°C to +70°C
SILICONIX
Si9433DY
BATT ON
MAX793
GND
PMOS
LOWLINE
BATT OK
CE OUT
CC
RESET
CE IN
OUT
WDI
DECODER
ADDRESS
V
CMOS
CC
0.1 F
RAM
CC
16 Plastic DIP
16 Narrow SO
16 Plastic DIP
16 Narrow SO
PIN-PACKAGE
= 1V
I/O
NMI
A0-A15
RESET
V
CC
P
1
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