MAX793SESE Maxim Integrated Products, MAX793SESE Datasheet

IC MPU SUPERVISORY CIRC 16SOIC

MAX793SESE

Manufacturer Part Number
MAX793SESE
Description
IC MPU SUPERVISORY CIRC 16SOIC
Manufacturer
Maxim Integrated Products
Type
Battery Backup Circuitr
Datasheet
1.MAX795TCSA.pdf (20 pages)

Specifications of MAX793SESE

Number Of Voltages Monitored
1
Output
Open Drain, Push-Pull
Reset
Active High/Active Low
Reset Timeout
140 ms Minimum
Voltage - Threshold
2.925V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
16-SOIC (3.9mm Width)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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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.
________________________Applications
19-0366; Rev 6; 3/10
Pin Configurations appear at end of data sheet.
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
_____________________Selector Guide
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
Pin-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
General Description
16-DIP/SO 16-DIP/SO 8-DIP/SO
MAX793
3.0V/3.3V Adjustable Microprocessor











MAX794











CC
.
MAX795




MAX793/MAX794/MAX795
o Precision Supply-Voltage Monitor:
o Guaranteed Reset Assertion to V
o Backup-Battery Power Switching—Battery
o On-Board Gating of Chip-Enable Signals—7ns
MAX793/MAX794 Only
o Battery Freshness Seal
o Battery OK Output (MAX793)
o Uncommitted Voltage Monitor for Power-Fail or
o Independent Watchdog Timer (1.6s timeout)
o Manual Reset Input
____________________________Features
Ordering Information continued at end of data sheet.
* 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.
Devices are available in both leaded and lead-free packaging.
Specify lead free by adding the + symbol at the end of the part
number when ordering.
__________Typical Operating Circuit
MAX793_CPE
MAX793_CSE
Voltage Can Exceed V
Max Propagation Delay
Low-Battery Warning
3.6V
Fixed Reset Trip Voltage (MAX793/MAX795)
Adjustable Reset Trip Voltage (MAX794)
PART*
+5V
Supervisory Circuits
3.0V OR 3.3V
+5V SUPPLY
FAILURE
0.1µF
0.1µF
V
BATT
PFO
PFI
MR
WDO
CC
(OPTIONAL)
SILICONIX
Si9433DY
TEMP RANGE
BATT ON
MAX793
Ordering Information
0°C to +70°C
0°C to +70°C
GND
PMOS
LOWLINE
BATT OK
CE OUT
CC
RESET
CE IN
OUT
WDI
ADDRESS
DECODER
V
CMOS
CC
0.1µF
RAM
CC
PIN-
PACKAGE
16 Plastic DIP
16 Narrow SO
= 1V
I/O
NMI
A0-A15
RESET
V
µP
CC
1

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MAX793SESE Summary of contents

Page 1

... Battery-Powered Computers and Controllers Embedded Controllers Intelligent Controllers Critical µP Power Monitoring Portable Equipment Pin Configurations appear at end of data sheet. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. Supervisory Circuits ____________________________Features MAX793/MAX794/MAX795 ...

Page 2

Adjustable Microprocessor Supervisory Circuits ABSOLUTE MAXIMUM RATINGS Terminal Voltage (with respect to GND) V ......................................................................-0.3V to +6. ...................................................................-0.3V to +6.0V BATT All Other Inputs ..................-0.3V to the higher of V Continuous Input Current V .................................................................................200mA CC V ...

Page 3

Adjustable Microprocessor ELECTRICAL CHARACTERISTICS (continued 3.17V to 5.5V for the MAX793T/MAX795T MAX793R/MAX794/MAX795R 3.6V, T BATT PARAMETER SYMBOL Reset Threshold (Note 8) V RST RESET IN Threshold V RST IN (MAX794 only) RESET IN ...

Page 4

Adjustable Microprocessor Supervisory Circuits ELECTRICAL CHARACTERISTICS (continued 3.17V to 5.5V for the MAX793T/MAX795T MAX793R/MAX794/MAX795R 3.6V, T BATT PARAMETER SYMBOL RESET Output-Voltage Low V OL BATT ON Output Voltage Low All Inputs ...

Page 5

Microprocessor __________________________________________Typical Operating Characteristics (T = +25°C, unless otherwise noted -TO-OUT ON-RESISTANCE CC vs. TEMPERATURE 3 30mA OUT 2.8 2.6 2.4 2 3. 3.3V CC 1.8 1 ...

Page 6

Adjustable Microprocessor Supervisory Circuits ____________________________Typical Operating Characteristics (continued +25°C, unless otherwise noted.) A MAX794 RESET IN THRESHOLD AND LOWLINE-TO-RESET IN THRESHOLD vs. TEMPERATURE 1.242 1.241 V RESET IN 1.240 1.239 LOWLINE RST 1.238 1.237 ...

Page 7

Adjustable Microprocessor ______________________________________________________________Pin Description PIN NAME MAX793/ MAX795 MAX794 1 1 OUT BATT OK (MAX793) 3 — RESET IN (MAX794) 4 — PFI 5 3 BATT GND PFO 7 — ...

Page 8

Adjustable Microprocessor Supervisory Circuits _______________Detailed Description General Timing Characteristics The MAX793/MAX794/MAX795 are designed for 3.3V and 3V systems, and provide a number of supervisory functions (see the Selector Guide on the front page). Figures 1 and 2 show the ...

Page 9

Adjustable Microprocessor brownout conditions. RESET is guaranteed logic low for 0V < V < provided V CC RST greater than 1V. Without a backup battery (V ), RESET is guaranteed valid for V V ...

Page 10

Adjustable Microprocessor Supervisory Circuits (OPTIONAL) Si9433DY 3.3V SILICONIX D S 0.1µF PMOS R1 V BATT ON OUT CC RESET IN CE OUT R2 MAX794 ADDRESS CE IN BATT DECODER 0.1µF 3.6V WDI WDO LOWLINE V MR +5V SUPPLY PFO ...

Page 11

Adjustable Microprocessor V RST RESET WDO t WD WDI WDO CONNECTED TO µP INTERRUPT RESET PULLED Figure 5. Watchdog Timing Relationship a reset occurs or when a transition (low-to-high or high- ...

Page 12

Adjustable Microprocessor Supervisory Circuits MAX793 MAX794 MAX795 CHIP-ENABLE OUTPUT CONTROL RESET P GENERATOR Figure 7. Chip-Enable Transmission Gate The CE transmission gate remains disabled and CE IN remains high impedance (regardless activity) for ...

Page 13

Adjustable Microprocessor BATT 3.6V 25Ω EQUIVALENT SOURCE IMPEDANCE 50Ω CABLE CE IN 50Ω 50Ω *C INCLUDES LOAD CAPACITANCE AND SCOPE PROBE CAPACITANCE. L Figure 9. CE Propagation Delay Test Circuit 10). If there is no easy access to the ...

Page 14

Adjustable Microprocessor Supervisory Circuits MAX793 PFI MAX794 R2 GND PFO TRIP – TRIP PFT PFH ...

Page 15

Adjustable Microprocessor V RST V CC 3.6V 3.3V V OUT V = 3.6V BATT Figure 13. Battery Switchover Timing Table 1. Input and Output Status in Battery-Backup Mode PIN NAME STATUS Connected to BATT through an internal OUT 140Ω ...

Page 16

Adjustable Microprocessor Supervisory Circuits 3.0V OR 3.3V V BATT ON CC MAX793 MAX794 MAX795 GND (a) Figure 14. Driving an External Transistor with BATT ON 3.0V OR 3.3V MAX793 V CC MAX794 1N4148 BATT 0.47F GND (a) Figure 15. ...

Page 17

Adjustable Microprocessor PFI R2 R3 C1* PFO TO µP PFO TRIP ( ) TRIP PFT ...

Page 18

Adjustable Microprocessor Supervisory Circuits Figure 18 shows maximum transient duration vs. reset- comparator overdrive, for which reset pulses are not generated. The graph was produced using negative- going V pulses, starting at 3.3V and ending below CC the reset ...

Page 19

Adjustable Microprocessor _Ordering Information (continued) PART* TEMP RANGE MAX793_EPE -40°C to +85°C MAX793_ESE -40°C to +85°C MAX794CPE 0°C to +70°C MAX794CSE 0°C to +70°C MAX794EPE -40°C to +85°C MAX794ESE -40°C to +85°C MAX795_CPA 0°C to +70°C MAX795_CSA 0°C to ...

Page 20

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 20 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2010 Maxim Integrated Products ...

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