MAX6368HKA31+T Maxim Integrated Products, MAX6368HKA31+T Datasheet

IC SUPERVISOR MPU LP SOT23-8

MAX6368HKA31+T

Manufacturer Part Number
MAX6368HKA31+T
Description
IC SUPERVISOR MPU LP SOT23-8
Manufacturer
Maxim Integrated Products
Type
Battery Backup Circuitr
Datasheet
1.MAX6368HKA31T.pdf (15 pages)

Specifications of MAX6368HKA31+T

Number Of Voltages Monitored
1
Output
Open Drain or Open Collector
Reset
Active High
Reset Timeout
150 ms Minimum
Voltage - Threshold
3.08V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
SOT-23-8
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX6365–MAX6368 supervisory circuits simplify
power-supply monitoring, battery-backup control func-
tions, and memory write protection in microprocessor
(µP) systems. The circuits significantly improve the size,
accuracy, and reliability of modern systems with an ultra-
small integrated solution.
These devices perform four basic system functions:
1) Provide a µP reset output during V
2) Internally control V
3) Provide memory write protection through internal
4) Include one of the following options: a manual reset
The MAX6365–MAX6368 operate from V
ages as low as 1.2V. The factory preset reset threshold
voltages range from 2.32V to 4.63V (see the Ordering
Information ). In addition, each part is offered in three
reset output versions: push-pull active low, open-drain
active low, or open-drain active high (see the Selector
Guide ). The MAX6365–MAX6368 are available in minia-
ture 8-pin SOT23 packages.
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.
19-1658; Rev 4; 5/09
Pin Configurations continued at end of data sheet.
up, power-down, and brownout conditions.
maintain data or low-power operation for CMOS
RAM, CMOS µPs, real-time clocks, and other digital
logic when the main supply fails.
chip-enable gating during supply or processor faults.
input (MAX6365), a watchdog timer function
(MAX6366), a battery-on output (MAX6367), or an
auxiliary user-adjustable reset input (MAX6368).
TOP VIEW
Critical µP/µC Power
Monitoring
Fax Machines
Industrial Control
Computers/Controllers
with Battery Backup and Chip-Enable Gating
RESET, RESET
SOT23, Low-Power µP Supervisory Circuits
CE IN
GND
MR
________________________________________________________________ Maxim Integrated Products
1
2
4
3
CC
General Description
MAX6365
SOT23
to backup-battery switching to
Pin Configurations
Portable/Battery-
Powered Equipment
Set-Top Boxes
POS Equipment
7
6
5
8
Applications
CC
CE OUT
BATT
OUT
V
CC
CC
supply power-
supply volt-
o Low +1.2V Operating Supply Voltage (V
o Precision Monitoring of +5.0V, +3.3V, +3.0V, and
o On-Board Gating of Chip-Enable Signals, 1.5ns
o Debounced Manual Reset Input (MAX6365)
o Watchdog Timer, 1.6s Timeout (MAX6366)
o Battery-On Output Indicator (MAX6367)
o Auxiliary User-Adjustable RESET IN (MAX6368)
o Low 10μA Quiescent Supply Current
o Three Available Output Structures
o RESET/RESET Valid Down to 1.2V Guaranteed
o Power-Supply Transient Immunity
o 150ms min Reset Timeout Period
o Miniature 8-Pin SOT23 Package
* These parts offer a choice of reset threshold voltages. From the
Reset Threshold Ranges table, insert the desired threshold volt-
age code in the blank to complete the part number. SOT parts
come in tape and reel only and must be ordered in 2500-piece
increments. See Device Marking Codes for a complete parts list,
including SOT top marks and standard threshold versions. See
Selector Guide for a listing of device features.
Devices are available in both leaded and lead(Pb)-free packaging.
Specify lead-free by replacing “-T” with “+T” when ordering.
- Denotes a package containing lead(Pb).
T = Tape and reel.
/V Denotes an automotive qualified part.
Typical Operating Circuit appears at end of data sheet.
M A X6 3 6 5 LK A_ _-T
MAX6365PKA_ _-T
MAX6365HKA_ _-T
M A X6 3 6 6 LK A_ _-T
M A X 6 36 6P K A_ _-T
M A X 6 36 6H K A_ _-T
M A X6 3 6 7 LK A_ _-T
M A X 6 36 7P K A_ _-T
M A X 6 36 7P K A_ _/V-T
M A X 6 36 7H K A_ _-T
M A X6 3 6 8 LK A_ _-T
M A X 6 36 8P K A_ _-T
M A X 6 36 8H K A_ _-T
+2.5V Power-Supply Voltages
Propagation Delay
(V
CC
Push-Pull RESET
Open-Drain RESET
Open-Drain RESET
or V
PART*
BATT
)
Ordering Information
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
PIN-PACKAGE
8 SOT23
8 SOT23
8 SOT23
8 SOT23
8 SOT23
8 SOT23
8 SOT23
8 SOT23
8 SOT23
8 SOT23
8 SOT23
8 SOT23
8 SOT23
Features
CC
or V
BATT
1
)

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MAX6368HKA31+T Summary of contents

Page 1

... MR 4 SOT23 Pin Configurations continued 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. o Low +1.2V Operating Supply Voltage (V o Precision Monitoring of +5.0V, +3.3V, +3.0V, and +2.5V Power-Supply Voltages o On-Board Gating of Chip-Enable Signals, 1 ...

Page 2

SOT23, Low-Power µP Supervisory Circuits with Battery Backup and Chip-Enable Gating ABSOLUTE MAXIMUM RATINGS Terminal Voltages (with respect to GND BATT, OUT.......................................................-0.3V to +6V CC RESET (open drain), RESET (open drain) ................-0.3V to +6V BATT ON, RESET (push-pull), ...

Page 3

SOT23, Low-Power µP Supervisory Circuits with Battery Backup and Chip-Enable Gating ELECTRICAL CHARACTERISTICS (continued) = +3.0V +2.4V to +5.5V BATT unless otherwise noted.) (Note 1) PARAMETER SYMBOL Reset Active Timeout Period V ...

Page 4

SOT23, Low-Power µP Supervisory Circuits with Battery Backup and Chip-Enable Gating ELECTRICAL CHARACTERISTICS (continued) = +3.0V +2.4V to +5.5V BATT unless otherwise noted.) (Note 1) PARAMETER SYMBOL RESET IN (MAX6368 only) RESET ...

Page 5

SOT23, Low-Power µP Supervisory Circuits with Battery Backup and Chip-Enable Gating (T = +25°C, unless otherwise noted OUT ON-RESISTANCE CC vs. TEMPERATURE 1 2.3V 1 25mA OUT 1.0 0.8 0 ...

Page 6

SOT23, Low-Power µP Supervisory Circuits with Battery Backup and Chip-Enable Gating (T = +25°C, unless otherwise noted.) A MAX6368 RESET IN THRESHOLD vs. TEMPERATURE 1.236 1.235 1.234 -40 - TEMPERATURE (° ...

Page 7

SOT23, Low-Power µP Supervisory Circuits with Battery Backup and Chip-Enable Gating PIN NAME Acti ve Reset Outp ut asser conti nuousl y w hen ...

Page 8

SOT23, Low-Power µP Supervisory Circuits with Battery Backup and Chip-Enable Gating 1.235V V CC BATT CE IN 20k MR (MAX6365 ONLY) WDI (MAX6366 ONLY) RESET IN (MAX6368 ONLY) 1.235V Detailed Description The Typical Operating Circuit shows a typical connec- tion ...

Page 9

SOT23, Low-Power µP Supervisory Circuits with Battery Backup and Chip-Enable Gating OUT goes high and stays high regardless of any sub- sequent transitions during the reset event. When CE OUT is disconnected from CE IN, CE OUT ...

Page 10

SOT23, Low-Power µP Supervisory Circuits with Battery Backup and Chip-Enable Gating WDI RESET t = WATCHDOG TIMEOUT PERIOD RESET TIMEOUT PERIOD RP Figure 2. MAX6366 Watchdog Timeout Period and Reset Active Time Watchdog Input (MAX6366 Only) The ...

Page 11

SOT23, Low-Power µP Supervisory Circuits with Battery Backup and Chip-Enable Gating watchdog is set low in the beginning of the program, set high at the beginning of every subroutine or loop, and set low again when the program returns to ...

Page 12

SOT23, Low-Power µP Supervisory Circuits with Battery Backup and Chip-Enable Gating Reset Threshold Ranges RESET THRESHOLD RANGES (V) SUFFIX MIN TYP 46 4.50 4.63 44 4.25 4.38 31 3.00 3.08 29 2.85 2.93 26 2.55 2.63 23 2.25 2.32 PART ...

Page 13

SOT23, Low-Power µP Supervisory Circuits with Battery Backup and Chip-Enable Gating MANUAL WATCH- PART RESET INPUT INPUT MAX6365LKA__ MAX6365PKA__ MAX6365HKA__ MAX6366LKA__ MAX6366PKA__ MAX6366HKA__ MAX6367LKA__ MAX6367PKA__ MAX6367HKA__ MAX6368LKA__ MAX6368PKA__ MAX6368HKA__ TOP VIEW RESET, RESET MAX6366 ...

Page 14

SOT23, Low-Power µP Supervisory Circuits with Battery Backup and Chip-Enable Gating SECONDARY DC VOLTAGE R1 R2 *RESET IN APPLIES TO MAX6368 ONLY. **WDI APPLIES TO MAX6366 ONLY. Chip Information PROCESS: CMOS 14 ______________________________________________________________________________________ +2.4V TO +5.5V CMOS RAM 0.1μF CE ...

Page 15

... 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 15 © 2009 Maxim Integrated Products DESCRIPTION Maxim is a registered trademark of Maxim Integrated Products, Inc ...

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