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MAX793T Datasheet

  • MAX793T

  • 3.0V/3.3V可调、微处理器监控电路, 微处理器监控电路, 提供备用...

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  • 20页

  • MAXIM

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19-0366; Rev 1; 1/96
3.0V/3.3V Adjustable Microprocessor
Supervisory Circuits
_______________General Description
The MAX793/MAX794/MAX795 microprocessor (碌P)
supervisory circuits monitor and control the activities of
+3.0V/+3.3V 碌Ps by providing backup-battery switchover,
among other features such as low-line indication, 碌P
reset, write protection for CMOS RAM, and a watchdog
(see the
Selector Guide
below). The backup-battery volt-
age can exceed V
CC
, permitting the use of 3.6V lithium
batteries in systems using 3.0V to 3.3V for V
CC
.
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鈥檚 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
碌P Supervisory
Circuits
table at the back of this data sheet.
____________________________Features
MAX793/MAX794/MAX795
o
Precision Supply-Voltage Monitor:
Fixed Reset Trip Voltage (MAX793/MAX795)
Adjustable Reset Trip Voltage (MAX794)
o
Guaranteed Reset Assertion to V
CC
= 1V
o
Backup-Battery Power Switching鈥擝attery
Voltage Can Exceed V
CC
o
On-Board Gating of Chip-Enable Signals鈥?ns
Max Propagation Delay
MAX793/MAX794 Only
o
Battery Freshness Seal
o
Battery OK Output (MAX793)
o
Uncommitted Voltage Monitor for Power-Fail or
Low-Battery Warning
o
Independent Watchdog Timer (1.6sec timeout)
o
Manual Reset Input
MAX793/MAX794/MAX795
_____________________Selector Guide
FEATURE
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
MAX793
MAX794
MAX795
______________Ordering Information
PART*
MAX793_CPE
TEMP. RANGE
0掳C to +70掳C
PIN-PACKAGE
16 Plastic DIP
MAX793_CSE
0掳C to +70掳C
16 Narrow SO
MAX793_EPE
-40掳C to +85掳C
16 Plastic DIP
MAX793_ESE
-40掳C to +85掳C
16 Narrow SO
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鈥檚 reset threshold is adjustable.
__________Typical Operating Circuit
3.0V OR 3.3V
0.1碌F
(OPTIONAL)
Si9433DY
SILICONIX
0.1碌F
PMOS
V
CC
BATT ON OUT
BATT
CE OUT
MAX793
16-DIP/SO 16-DIP/SO 8-DIP/SO
3.6V
0.1碌F
________________________Applications
Battery-Powered Computers and Controllers
Embedded Controllers
Intelligent Controllers
Critical 碌P Power Monitoring
Portable Equipment
CMOS
RAM
V
CC
WDO
+5V SUPPLY
FAILURE
+5V
MR
PFO
CE IN
WDI
LOWLINE
ADDRESS
DECODER
A0-A15
I/O
NMI
V
CC
碌P
RESET
PFI
RESET
BATT OK
GND
Pin Configurations appear at end of data sheet.
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800

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